[pgpool-general: 8946] Re: pgpool 4.4.4: reading status file: 1 th backend is set to down status

Camarena Daniel Daniel.Camarena at azo.com
Tue Oct 17 00:59:07 JST 2023


Hi Tatsuo,



thanks for your reply and the explication.



To comment your answers:

>   >   1.  Is there a file which buffers pg states?

>   If you mean "pg_status" column in show pool_nodes command, no. It is obtained from PostgreSQL on the fly when show pool_nodes command gets executed.

Yes. But it seems that out of pg_status is formed a resulting state which is in the column status of show pool_nodes (see results below) and this indicates that the service is down - and pgpool is acting like this. See below the log of pgpool: It indicates, that is marking 0 th node as down because of the "status file".



>   >   2.  How did the system get into this state?

>   I am not familiar with bitnami pgpool nor repmgr. So what I can do is answer from the point of pgpool view. It was caused by either failover triggered by health check (pgpool detects error / shutdown of PostgreSQL), or pcp_detach_node gets executed. I cannot tell either unless looking into pgpool log and pgpool.conf

Pg0 had tons of these messages:

2023-10-11 11:19:03.522 GMT [956538] FATAL:  remaining connection slots are reserved for non-replication superuser connections

2023-10-11 11:19:03.525 GMT [956537] FATAL:  remaining connection slots are reserved for non-replication superuser connections

2023-10-11 11:19:03.542 GMT [956539] FATAL:  remaining connection slots are reserved for non-replication superuser connections

2023-10-11 11:19:03.545 GMT [956540] FATAL:  remaining connection slots are reserved for non-replication superuser connections

Pg1 has right now, as I was examining the system the same messages. Sometimes they appear and it seems that because of the a failover occurs - like you described before.

Should I just increase max_connections, default 100, to 200 to prevent the problem?



In the meanwhile I have found a file in the logs folder of pgpool. It has the following content:

      root at c8bdc87693d4:/opt/bitnami/pgpool/logs# cat pgpool_status

      down

      up

      up



As pgpool has a line during startup

      2023-10-16 05:28:21.670: main pid 1: LOG:  reading status file: 0 th backend is set to down status

I thought this file is read and the status of pg0 is overridden by this.



show pool_nodes; returns the following:

      node_id | hostname  | port | status | pg_status | lb_weight |  role   | pg_role | select_cnt | load_balance_node | replication_delay | replication_state | replication_sync_state | last_status_change

      ---------+-----------+------+--------+-----------+-----------+---------+---------+------------+-------------------+-------------------+-------------------+------------------------+---------------------

      0       | 10.0.10.7 | 5432 | down   | up        | 0.333333  | standby | primary | 0          | false             | 0                 |                   |                        | 2023-10-16 05:29:17

      1       | 10.0.10.8 | 5432 | up     | up        | 0.333333  | standby | standby | 5          | false             | 0                 |                   |                        | 2023-10-16 05:29:17

      2       | 10.0.10.9 | 5432 | up     | up        | 0.333333  | standby | standby | 11         | true              | 0                 |                   |                        | 2023-10-16 05:29:17

      (3 rows)

Indicates, that pg_role of pg0 is primary but the resulting role is standby, as resulting status is down, even if pg_status is up.



As orchestration always starts pgpool new, I post the startup sequence of the container:

pgpool 05:28:21.38

pgpool 05:28:21.38 Welcome to the Bitnami pgpool container

pgpool 05:28:21.38 Subscribe to project updates by watching https://github.com/bitnami/containers

pgpool 05:28:21.38 Submit issues and feature requests at https://github.com/bitnami/containers/issues

pgpool 05:28:21.38

pgpool 05:28:21.39 INFO  ==> ** Starting Pgpool-II setup **

pgpool 05:28:21.40 INFO  ==> Validating settings in PGPOOL_* env vars...

pgpool 05:28:21.42 INFO  ==> Initializing Pgpool-II...

pgpool 05:28:21.42 INFO  ==> Generating pg_hba.conf file...

pgpool 05:28:21.42 INFO  ==> Generating pgpool.conf file...

pgpool 05:28:21.54 INFO  ==> Generating password file for local authentication...

pgpool 05:28:21.54 INFO  ==> Generating password file for pgpool admin user...

pgpool 05:28:21.55 INFO  ==> ** Pgpool-II setup finished! **

pgpool 05:28:21.57 INFO  ==> ** Starting Pgpool-II **

==> 2023-10-16 05:28:21.670: main pid 1: LOG:  reading status file: 0 th backend is set to down status

2023-10-16 05:28:21.670: main pid 1: LOG:  health_check_stats_shared_memory_size: requested size: 12288

2023-10-16 05:28:21.671: main pid 1: LOG:  memory cache initialized

2023-10-16 05:28:21.671: main pid 1: DETAIL:  memcache blocks :64

2023-10-16 05:28:21.671: main pid 1: LOG:  allocating (144190784) bytes of shared memory segment

2023-10-16 05:28:21.671: main pid 1: LOG:  allocating shared memory segment of size: 144190784

2023-10-16 05:28:21.730: main pid 1: LOG:  health_check_stats_shared_memory_size: requested size: 12288

2023-10-16 05:28:21.730: main pid 1: LOG:  health_check_stats_shared_memory_size: requested size: 12288

2023-10-16 05:28:21.730: main pid 1: LOG:  memory cache initialized

2023-10-16 05:28:21.730: main pid 1: DETAIL:  memcache blocks :64

2023-10-16 05:28:21.731: main pid 1: LOG:  pool_discard_oid_maps: discarded memqcache oid maps

2023-10-16 05:28:21.741: main pid 1: LOG:  unix_socket_directories[0]: /opt/bitnami/pgpool/tmp/.s.PGSQL.5432

2023-10-16 05:28:21.741: main pid 1: LOG:  listen address[0]: *

2023-10-16 05:28:21.741: main pid 1: LOG:  Setting up socket for 0.0.0.0:5432

2023-10-16 05:28:21.741: main pid 1: LOG:  Setting up socket for :::5432

2023-10-16 05:28:21.757: main pid 1: LOG:  find_primary_node_repeatedly: waiting for finding a primary node

2023-10-16 05:28:21.793: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:21.793: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:22.833: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:22.833: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:23.881: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:23.881: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:24.922: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:24.922: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:25.959: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:25.959: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:26.996: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:26.996: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:28.034: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:28.034: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:29.071: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:29.071: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:30.108: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:30.108: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:31.147: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:31.147: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:32.188: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:32.188: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:33.225: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:33.225: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:34.261: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:34.261: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:35.299: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:35.300: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:36.339: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:36.339: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:37.377: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:37.377: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:38.416: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:38.416: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:39.453: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:39.453: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:40.492: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:40.492: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:41.542: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:41.542: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:42.580: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:42.580: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:43.616: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:43.616: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:44.653: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:44.653: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:45.696: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:45.696: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:46.734: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:46.734: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:47.770: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:47.770: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:48.809: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:48.809: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:49.846: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:49.847: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:50.886: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:50.886: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:51.922: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:51.923: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:52.962: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:52.962: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:54.003: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:54.003: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:55.045: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:55.045: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:56.095: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:56.095: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:57.131: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:57.131: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:58.168: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:58.168: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:28:59.212: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:28:59.212: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:00.248: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:00.248: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:01.286: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:01.286: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:02.324: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:02.324: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:03.366: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:03.366: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:04.404: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:04.404: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:05.440: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:05.440: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:06.476: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:06.476: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:07.513: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:07.514: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:08.553: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:08.553: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:09.589: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:09.589: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:10.628: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:10.628: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:11.666: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:11.666: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:12.704: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:12.704: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:13.741: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:13.741: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:14.783: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:14.783: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:15.824: main pid 1: LOG:  find_primary_node: standby node is 1

2023-10-16 05:29:15.824: main pid 1: LOG:  find_primary_node: standby node is 2

2023-10-16 05:29:16.729: main pid 1: LOG:  exit handler called (signal: 15)

2023-10-16 05:29:16.729: main pid 1: LOG:  shutting down by signal 15

2023-10-16 05:29:16.729: main pid 1: LOG:  terminating all child processes

2023-10-16 05:29:16.762: main pid 1: LOG:  Pgpool-II system is shutdown



Last but not least pgpool.conf you requested. I left the comments in the file:

I have no name!@73d3fcf715c2:/opt/bitnami/pgpool/conf$ cat pgpool.conf

# ----------------------------

# pgPool-II configuration file

# ----------------------------

#

# This file consists of lines of the form:

#

#   name = value

#

# Whitespace may be used.  Comments are introduced with "#" anywhere on a line.

# The complete list of parameter names and allowed values can be found in the

# pgPool-II documentation.

#

# This file is read on server startup and when the server receives a SIGHUP

# signal.  If you edit the file on a running system, you have to SIGHUP the

# server for the changes to take effect, or use "pgpool reload".  Some

# parameters, which are marked below, require a server shutdown and restart to

# take effect.

#



#------------------------------------------------------------------------------

# BACKEND CLUSTERING MODE

# Choose one of: 'streaming_replication', 'native_replication',

#       'logical_replication', 'slony', 'raw' or 'snapshot_isolation'

# (change requires restart)

#------------------------------------------------------------------------------



backend_clustering_mode = 'streaming_replication'



#------------------------------------------------------------------------------

# CONNECTIONS

#------------------------------------------------------------------------------



# - pgpool Connection Settings -



listen_addresses = '*'

                                   # what host name(s) or IP address(es) to listen on;

                                   # comma-separated list of addresses;

                                   # defaults to 'localhost'; use '*' for all

                                   # (change requires restart)

port = '5432'

                                   # Port number

                                   # (change requires restart)

unix_socket_directories = '/opt/bitnami/pgpool/tmp'

                                   # Unix domain socket path(s)

                                   # The Debian package defaults to

                                   # /var/run/postgresql

                                   # (change requires restart)

#unix_socket_group = ''

                                   # The Owner group of Unix domain socket(s)

                                   # (change requires restart)

#unix_socket_permissions = 0777

                                   # Permissions of Unix domain socket(s)

                                   # (change requires restart)

#reserved_connections = 0

                                   # Number of reserved connections.

                                   # Pgpool-II does not accept connections if over

                                   # num_init_chidlren - reserved_connections.





# - pgpool Communication Manager Connection Settings -



#pcp_listen_addresses = 'localhost'

                                   # what host name(s) or IP address(es) for pcp process to listen on;

                                   # comma-separated list of addresses;

                                   # defaults to 'localhost'; use '*' for all

                                   # (change requires restart)

#pcp_port = 9898

                                   # Port number for pcp

                                   # (change requires restart)

pcp_socket_dir = '/opt/bitnami/pgpool/tmp'

                                   # Unix domain socket path for pcp

                                   # The Debian package defaults to

                                   # /var/run/postgresql

                                   # (change requires restart)

#listen_backlog_multiplier = 2

                                   # Set the backlog parameter of listen(2) to

                                   # num_init_children * listen_backlog_multiplier.

                                   # (change requires restart)

#serialize_accept = off

                                   # whether to serialize accept() call to avoid thundering herd problem

                                   # (change requires restart)



# - Backend Connection Settings -



#backend_hostname0 = 'host1'

                                   # Host name or IP address to connect to for backend 0

#backend_port0 = 5432

                                   # Port number for backend 0

#backend_weight0 = 1

                                   # Weight for backend 0 (only in load balancing mode)

#backend_data_directory0 = '/data'

                                   # Data directory for backend 0

#backend_flag0 = 'ALLOW_TO_FAILOVER'

                                   # Controls various backend behavior

                                   # ALLOW_TO_FAILOVER, DISALLOW_TO_FAILOVER

                                   # or ALWAYS_PRIMARY

#backend_application_name0 = 'server0'

                                   # walsender's application_name, used for "show pool_nodes" command

#backend_hostname1 = 'host2'

#backend_port1 = 5433

#backend_weight1 = 1

#backend_data_directory1 = '/data1'

#backend_flag1 = 'ALLOW_TO_FAILOVER'

#backend_application_name1 = 'server1'



# - Authentication -



enable_pool_hba = 'on'

                                   # Use pool_hba.conf for client authentication

pool_passwd = 'pool_passwd'

                                   # File name of pool_passwd for md5 authentication.

                                   # "" disables pool_passwd.

                                   # (change requires restart)

authentication_timeout = '30'

                                   # Delay in seconds to complete client authentication

                                   # 0 means no timeout.



allow_clear_text_frontend_auth = 'off'

                                   # Allow Pgpool-II to use clear text password authentication

                                   # with clients, when pool_passwd does not

                                   # contain the user password



# - SSL Connections -



#ssl = off

                                   # Enable SSL support

                                   # (change requires restart)

#ssl_key = 'server.key'

                                   # SSL private key file

                                   # (change requires restart)

#ssl_cert = 'server.crt'

                                   # SSL public certificate file

                                   # (change requires restart)

#ssl_ca_cert = ''

                                   # Single PEM format file containing

                                   # CA root certificate(s)

                                   # (change requires restart)

#ssl_ca_cert_dir = ''

                                   # Directory containing CA root certificate(s)

                                   # (change requires restart)

#ssl_crl_file = ''

                                   # SSL certificate revocation list file

                                   # (change requires restart)



#ssl_ciphers = 'HIGH:MEDIUM:+3DES:!aNULL'

                                   # Allowed SSL ciphers

                                   # (change requires restart)

#ssl_prefer_server_ciphers = off

                                   # Use server's SSL cipher preferences,

                                   # rather than the client's

                                   # (change requires restart)

#ssl_ecdh_curve = 'prime256v1'

                                   # Name of the curve to use in ECDH key exchange

#ssl_dh_params_file = ''

                                   # Name of the file containing Diffie-Hellman parameters used

                                   # for so-called ephemeral DH family of SSL cipher.

#ssl_passphrase_command=''

                                   # Sets an external command to be invoked when a passphrase

                                   # for decrypting an SSL file needs to be obtained

                                   # (change requires restart)



#------------------------------------------------------------------------------

# POOLS

#------------------------------------------------------------------------------



# - Concurrent session and pool size -



#process_management_mode = static

                                   # process management mode for child processes

                                   # Valid options:

                                   # static: all children are pre-forked at startup

                                   # dynamic: child processes are spawned on demand.

                                   #      number of idle child processes at any time are

                                   #      configured by min_spare_children and max_spare_children



#process_management_strategy = gentle

                                   # process management strategy to satisfy spare processes

                                   # Valid options:

                                   #

                                   #    lazy: In this mode, the scale-down is performed gradually

                                   #     and only gets triggered when excessive spare processes count

                                   #     remains high for more than 5 mins

                                   #

                                   #    gentle: In this mode, the scale-down is performed gradually

                                   #     and only gets triggered when excessive spare processes count

                                   #     remains high for more than 2 mins

                                   #

                                   #    aggressive: In this mode, the scale-down is performed aggressively

                                   #     and gets triggered more frequently in case of higher spare processes.

                                   #     This mode uses faster and slightly less smart process selection criteria

                                   #     to identify the child processes that can be serviced to satisfy

                                   #     max_spare_children

                                   #

                                   # (Only applicable for dynamic process management mode)



#num_init_children = 32

                                   # Maximum Number of concurrent sessions allowed

                                   # (change requires restart)

#min_spare_children = 5

                                   # Minimum number of spare child processes waiting for connection

                                   # (Only applicable for dynamic process management mode)



#max_spare_children = 10

                                   # Maximum number of idle child processes waiting for connection

                                   # (Only applicable for dynamic process management mode)



max_pool = '15'

                                   # Number of connection pool caches per connection

                                   # (change requires restart)



# - Life time -



#child_life_time = 5min

                                   # Pool exits after being idle for this many seconds

#child_max_connections = 0

                                   # Pool exits after receiving that many connections

                                   # 0 means no exit

#connection_life_time = 0

                                   # Connection to backend closes after being idle for this many seconds

                                   # 0 means no close

#client_idle_limit = 0

                                   # Client is disconnected after being idle for that many seconds

                                   # (even inside an explicit transactions!)

                                   # 0 means no disconnection





#------------------------------------------------------------------------------

# LOGS

#------------------------------------------------------------------------------



# - Where to log -



#log_destination = 'stderr'

                                   # Where to log

                                   # Valid values are combinations of stderr,

                                   # and syslog. Default to stderr.



# - What to log -



#log_line_prefix = '%m: %a pid %p: '   # printf-style string to output at beginning of each log line.



log_connections = 'off'

                                   # Log connections

#log_disconnections = off

                                   # Log disconnections

log_hostname = 'off'

                                   # Hostname will be shown in ps status

                                   # and in logs if connections are logged

#log_statement = off

                                   # Log all statements

log_per_node_statement = 'off'

                                   # Log all statements

                                   # with node and backend informations

#log_client_messages = off

                                   # Log any client messages

#log_standby_delay = 'if_over_threshold'

                                   # Log standby delay

                                   # Valid values are combinations of always,

                                   # if_over_threshold, none



# - Syslog specific -



#syslog_facility = 'LOCAL0'

                                   # Syslog local facility. Default to LOCAL0

#syslog_ident = 'pgpool'

                                   # Syslog program identification string

                                   # Default to 'pgpool'



# - Debug -



#log_error_verbosity = default          # terse, default, or verbose messages



#client_min_messages = notice           # values in order of decreasing detail:

                                        #   debug5

                                        #   debug4

                                        #   debug3

                                        #   debug2

                                        #   debug1

                                        #   log

                                        #   notice

                                        #   warning

                                        #   error



#log_min_messages = warning             # values in order of decreasing detail:

                                        #   debug5

                                        #   debug4

                                        #   debug3

                                        #   debug2

                                        #   debug1

                                        #   info

                                        #   notice

                                        #   warning

                                        #   error

                                        #   log

                                        #   fatal

                                        #   panic



# This is used when logging to stderr:

#logging_collector = off

                                        # Enable capturing of stderr

                                        # into log files.

                                        # (change requires restart)



# -- Only used if logging_collector is on ---



#log_directory = '/tmp/pgpool_logs'

                                        # directory where log files are written,

                                        # can be absolute

#log_filename = 'pgpool-%Y-%m-%d_%H%M%S.log'

                                        # log file name pattern,

                                        # can include strftime() escapes



#log_file_mode = 0600

                                        # creation mode for log files,

                                        # begin with 0 to use octal notation



#log_truncate_on_rotation = off

                                        # If on, an existing log file with the

                                        # same name as the new log file will be

                                        # truncated rather than appended to.

                                        # But such truncation only occurs on

                                        # time-driven rotation, not on restarts

                                        # or size-driven rotation.  Default is

                                        # off, meaning append to existing files

                                        # in all cases.



#log_rotation_age = 1d

                                        # Automatic rotation of logfiles will

                                        # happen after that (minutes)time.

                                        # 0 disables time based rotation.

#log_rotation_size = 10MB

                                        # Automatic rotation of logfiles will

                                        # happen after that much (KB) log output.

                                        # 0 disables size based rotation.

#------------------------------------------------------------------------------

# FILE LOCATIONS

#------------------------------------------------------------------------------



pid_file_name = '/opt/bitnami/pgpool/tmp/pgpool.pid'

                                   # PID file name

                                   # Can be specified as relative to the"

                                   # location of pgpool.conf file or

                                   # as an absolute path

                                   # (change requires restart)

logdir = '/opt/bitnami/pgpool/logs'

                                   # Directory of pgPool status file

                                   # (change requires restart)





#------------------------------------------------------------------------------

# CONNECTION POOLING

#------------------------------------------------------------------------------



#connection_cache = on

                                   # Activate connection pools

                                   # (change requires restart)



                                   # Semicolon separated list of queries

                                   # to be issued at the end of a session

                                   # The default is for 8.3 and later

#reset_query_list = 'ABORT; DISCARD ALL'

                                   # The following one is for 8.2 and before

#reset_query_list = 'ABORT; RESET ALL; SET SESSION AUTHORIZATION DEFAULT'





#------------------------------------------------------------------------------

# REPLICATION MODE

#------------------------------------------------------------------------------



#replicate_select = off

                                   # Replicate SELECT statements

                                   # when in replication mode

                                   # replicate_select is higher priority than

                                   # load_balance_mode.



#insert_lock = off

                                   # Automatically locks a dummy row or a table

                                   # with INSERT statements to keep SERIAL data

                                   # consistency

                                   # Without SERIAL, no lock will be issued

#lobj_lock_table = ''

                                   # When rewriting lo_creat command in

                                   # replication mode, specify table name to

                                   # lock



# - Degenerate handling -



#replication_stop_on_mismatch = off

                                  # On disagreement with the packet kind

                                   # sent from backend, degenerate the node

                                   # which is most likely "minority"

                                   # If off, just force to exit this session



#failover_if_affected_tuples_mismatch = off

                                   # On disagreement with the number of affected

                                   # tuples in UPDATE/DELETE queries, then

                                   # degenerate the node which is most likely

                                   # "minority".

                                   # If off, just abort the transaction to

                                   # keep the consistency





#------------------------------------------------------------------------------

# LOAD BALANCING MODE

#------------------------------------------------------------------------------



load_balance_mode = 'on'

                                   # Activate load balancing mode

                                   # (change requires restart)

#ignore_leading_white_space = on

                                   # Ignore leading white spaces of each query

#read_only_function_list = ''

                                   # Comma separated list of function names

                                   # that don't write to database

                                   # Regexp are accepted

#write_function_list = ''

                                   # Comma separated list of function names

                                   # that write to database

                                   # Regexp are accepted

                                   # If both read_only_function_list and write_function_list

                                   # is empty, function's volatile property is checked.

                                   # If it's volatile, the function is regarded as a

                                   # writing function.



#primary_routing_query_pattern_list = ''

                                   # Semicolon separated list of query patterns

                                   # that should be sent to primary node

                                   # Regexp are accepted

                                   # valid for streaming replicaton mode only.



#database_redirect_preference_list = ''

                                   # comma separated list of pairs of database and node id.

                                   # example: postgres:primary,mydb[0-4]:1,mydb[5-9]:2'

                                   # valid for streaming replicaton mode only.



#app_name_redirect_preference_list = ''

                                   # comma separated list of pairs of app name and node id.

                                   # example: 'psql:primary,myapp[0-4]:1,myapp[5-9]:standby'

                                   # valid for streaming replicaton mode only.

#allow_sql_comments = off

                                   # if on, ignore SQL comments when judging if load balance or

                                   # query cache is possible.

                                   # If off, SQL comments effectively prevent the judgment

                                   # (pre 3.4 behavior).



disable_load_balance_on_write = 'transaction'

                                   # Load balance behavior when write query is issued

                                   # in an explicit transaction.

                                   #

                                   # Valid values:

                                   #

                                   # 'transaction' (default):

                                   #     if a write query is issued, subsequent

                                   #     read queries will not be load balanced

                                   #     until the transaction ends.

                                   #

                                   # 'trans_transaction':

                                   #     if a write query is issued, subsequent

                                   #     read queries in an explicit transaction

                                   #     will not be load balanced until the session ends.

                                   #

                                   # 'dml_adaptive':

                                   #     Queries on the tables that have already been

                                   #     modified within the current explicit transaction will

                                   #     not be load balanced until the end of the transaction.

                                   #

                                   # 'always':

                                   #     if a write query is issued, read queries will

                                   #     not be load balanced until the session ends.

                                   #

                                   # Note that any query not in an explicit transaction

                                   # is not affected by the parameter except 'always'.



#dml_adaptive_object_relationship_list= ''

                                   # comma separated list of object pairs

                                   # [object]:[dependent-object], to disable load balancing

                                   # of dependent objects within the explicit transaction

                                   # after WRITE statement is issued on (depending-on) object.

                                   #

                                   # example: 'tb_t1:tb_t2,insert_tb_f_func():tb_f,tb_v:my_view'

                                   # Note: function name in this list must also be present in

                                   # the write_function_list

                                   # only valid for disable_load_balance_on_write = 'dml_adaptive'.



statement_level_load_balance = 'off'

                                   # Enables statement level load balancing



#------------------------------------------------------------------------------

# STREAMING REPLICATION MODE

#------------------------------------------------------------------------------



# - Streaming -



sr_check_period = '30'

                                   # Streaming replication check period

                                   # Disabled (0) by default

sr_check_user = '****'

                                   # Streaming replication check user

                                   # This is neccessary even if you disable streaming

                                   # replication delay check by sr_check_period = 0

sr_check_password = '****'

                                   # Password for streaming replication check user

                                   # Leaving it empty will make Pgpool-II to first look for the

                                   # Password in pool_passwd file before using the empty password



sr_check_database = 'postgres'

                                   # Database name for streaming replication check

#delay_threshold = 0

                                   # Threshold before not dispatching query to standby node

                                   # Unit is in bytes

                                   # Disabled (0) by default

#delay_threshold_by_time = 0

                                   # Threshold before not dispatching query to standby node

                                   # Unit is in second(s)

                                   # Disabled (0) by default



#prefer_lower_delay_standby = off

                                   # If delay_threshold is set larger than 0, Pgpool-II send to

                                   # the primary when selected node is delayed over delay_threshold.

                                   # If this is set to on, Pgpool-II send query to other standby

                                   # delayed lower.



# - Special commands -



#follow_primary_command = ''

                                   # Executes this command after main node failover

                                   # Special values:

                                   #   %d = failed node id

                                   #   %h = failed node host name

                                   #   %p = failed node port number

                                   #   %D = failed node database cluster path

                                   #   %m = new main node id

                                   #   %H = new main node hostname

                                   #   %M = old main node id

                                   #   %P = old primary node id

                                   #   %r = new main port number

                                   #   %R = new main database cluster path

                                   #   %N = old primary node hostname

                                   #   %S = old primary node port number

                                   #   %% = '%' character



#------------------------------------------------------------------------------

# HEALTH CHECK GLOBAL PARAMETERS

#------------------------------------------------------------------------------



health_check_period = '30'

                                   # Health check period

                                   # Disabled (0) by default

health_check_timeout = '10'

                                   # Health check timeout

                                   # 0 means no timeout

health_check_user = '***'

                                   # Health check user

health_check_password = '***'

                                   # Password for health check user

                                   # Leaving it empty will make Pgpool-II to first look for the

                                   # Password in pool_passwd file before using the empty password



#health_check_database = ''

                                   # Database name for health check. If '', tries 'postgres' frist,

health_check_max_retries = '5'

                                   # Maximum number of times to retry a failed health check before giving up.

health_check_retry_delay = '5'

                                   # Amount of time to wait (in seconds) between retries.

connect_timeout = '10000'

                                   # Timeout value in milliseconds before giving up to connect to backend.

                                   # Default is 10000 ms (10 second). Flaky network user may want to increase

                                   # the value. 0 means no timeout.

                                   # Note that this value is not only used for health check,

                                   # but also for ordinary conection to backend.



#------------------------------------------------------------------------------

# HEALTH CHECK PER NODE PARAMETERS (OPTIONAL)

#------------------------------------------------------------------------------

#health_check_period0 = 0

#health_check_timeout0 = 20

#health_check_user0 = 'nobody'

#health_check_password0 = ''

#health_check_database0 = ''

#health_check_max_retries0 = 0

#health_check_retry_delay0 = 1

#connect_timeout0 = 10000



#------------------------------------------------------------------------------

# FAILOVER AND FAILBACK

#------------------------------------------------------------------------------



failover_command = 'echo ">>> Failover - that will initialize new primary node search!"'

                                   # Executes this command at failover

                                   # Special values:

                                   #   %d = failed node id

                                   #   %h = failed node host name

                                   #   %p = failed node port number

                                  #   %D = failed node database cluster path

                                   #   %m = new main node id

                                   #   %H = new main node hostname

                                   #   %M = old main node id

                                   #   %P = old primary node id

                                   #   %r = new main port number

                                   #   %R = new main database cluster path

                                   #   %N = old primary node hostname

                                   #   %S = old primary node port number

                                   #   %% = '%' character

#failback_command = ''

                                   # Executes this command at failback.

                                   # Special values:

                                   #   %d = failed node id

                                   #   %h = failed node host name

                                   #   %p = failed node port number

                                   #   %D = failed node database cluster path

                                   #   %m = new main node id

                                   #   %H = new main node hostname

                                   #   %M = old main node id

                                   #   %P = old primary node id

                                   #   %r = new main port number

                                   #   %R = new main database cluster path

                                   #   %N = old primary node hostname

                                   #   %S = old primary node port number

                                   #   %% = '%' character



failover_on_backend_error = 'off'

                                   # Initiates failover when reading/writing to the

                                   # backend communication socket fails

                                   # If set to off, pgpool will report an

                                   # error and disconnect the session.



#failover_on_backend_shutdown = off

                                   # Initiates failover when backend is shutdown,

                                   # or backend process is killed.

                                   # If set to off, pgpool will report an

                                   # error and disconnect the session.



#detach_false_primary = off

                                   # Detach false primary if on. Only

                                   # valid in streaming replicaton

                                   # mode and with PostgreSQL 9.6 or

                                   # after.



search_primary_node_timeout = '0'

                                   # Timeout in seconds to search for the

                                   # primary node when a failover occurs.

                                   # 0 means no timeout, keep searching

                                   # for a primary node forever.



#------------------------------------------------------------------------------

# ONLINE RECOVERY

#------------------------------------------------------------------------------



#recovery_user = 'nobody'

                                   # Online recovery user

#recovery_password = ''

                                   # Online recovery password

                                   # Leaving it empty will make Pgpool-II to first look for the

                                   # Password in pool_passwd file before using the empty password



#recovery_1st_stage_command = ''

                                   # Executes a command in first stage

#recovery_2nd_stage_command = ''

                                   # Executes a command in second stage

#recovery_timeout = 90

                                   # Timeout in seconds to wait for the

                                   # recovering node's postmaster to start up

                                   # 0 means no wait

#client_idle_limit_in_recovery = 0

                                   # Client is disconnected after being idle

                                   # for that many seconds in the second stage

                                   # of online recovery

                                   # 0 means no disconnection

                                   # -1 means immediate disconnection



#auto_failback = off

                                   # Dettached backend node reattach automatically

                                   # if replication_state is 'streaming'.

#auto_failback_interval = 1min

                                   # Min interval of executing auto_failback in

                                   # seconds.



#------------------------------------------------------------------------------

# WATCHDOG

#------------------------------------------------------------------------------



# - Enabling -



#use_watchdog = off

                                    # Activates watchdog

                                    # (change requires restart)



# -Connection to up stream servers -



#trusted_servers = ''

                                    # trusted server list which are used

                                    # to confirm network connection

                                    # (hostA,hostB,hostC,...)

                                    # (change requires restart)



#trusted_server_command = 'ping -q -c3 %h'

                                    # Command to excute when communicate trusted server.

                                    # Special values:

                                    #   %h = host name specified by trusted_servers



# - Watchdog communication Settings -



hostname0 = ''

                                    # Host name or IP address of pgpool node

                                    # for watchdog connection

                                    # (change requires restart)

#wd_port0 = 9000

                                    # Port number for watchdog service

                                    # (change requires restart)

#pgpool_port0 = 9999

                                    # Port number for pgpool

                                    # (change requires restart)



#hostname1 = ''

#wd_port1 = 9000

#pgpool_port1 = 9999



#hostname2 = ''

#wd_port2 = 9000

#pgpool_port2 = 9999



#wd_priority = 1

                                    # priority of this watchdog in leader election

                                    # (change requires restart)



#wd_authkey = ''

                                    # Authentication key for watchdog communication

                                    # (change requires restart)



#wd_ipc_socket_dir = '/tmp'

                                    # Unix domain socket path for watchdog IPC socket

                                    # The Debian package defaults to

                                    # /var/run/postgresql

                                    # (change requires restart)





# - Virtual IP control Setting -



#delegate_ip = ''

                                    # delegate IP address

                                    # If this is empty, virtual IP never bring up.

                                    # (change requires restart)

#if_cmd_path = '/sbin'

                                    # path to the directory where if_up/down_cmd exists

                                    # If if_up/down_cmd starts with "/", if_cmd_path will be ignored.

                                    # (change requires restart)

#if_up_cmd = '/usr/bin/sudo /sbin/ip addr add $_IP_$/24 dev eth0 label eth0:0'

                                    # startup delegate IP command

                                    # (change requires restart)

#if_down_cmd = '/usr/bin/sudo /sbin/ip addr del $_IP_$/24 dev eth0'

                                    # shutdown delegate IP command

                                    # (change requires restart)

#arping_path = '/usr/sbin'

                                    # arping command path

                                    # If arping_cmd starts with "/", if_cmd_path will be ignored.

                                    # (change requires restart)

#arping_cmd = '/usr/bin/sudo /usr/sbin/arping -U $_IP_$ -w 1 -I eth0'

                                    # arping command

                                    # (change requires restart)



#ping_path = '/bin'

                                    # ping command path

                                    # (change requires restart)



# - Behaivor on escalation Setting -



#clear_memqcache_on_escalation = on

                                    # Clear all the query cache on shared memory

                                    # when standby pgpool escalate to active pgpool

                                    # (= virtual IP holder).

                                    # This should be off if client connects to pgpool

                                    # not using virtual IP.

                                    # (change requires restart)

#wd_escalation_command = ''

                                    # Executes this command at escalation on new active pgpool.

                                    # (change requires restart)

#wd_de_escalation_command = ''

                                    # Executes this command when leader pgpool resigns from being leader.

                                    # (change requires restart)



# - Watchdog consensus settings for failover -



#failover_when_quorum_exists = on

                                    # Only perform backend node failover

                                    # when the watchdog cluster holds the quorum

                                    # (change requires restart)



#failover_require_consensus = on

                                    # Perform failover when majority of Pgpool-II nodes

                                    # aggrees on the backend node status change

                                    # (change requires restart)



#allow_multiple_failover_requests_from_node = off

                                    # A Pgpool-II node can cast multiple votes

                                    # for building the consensus on failover

                                    # (change requires restart)





#enable_consensus_with_half_votes = off

                                    # apply majority rule for consensus and quorum computation

                                    # at 50% of votes in a cluster with even number of nodes.

                                    # when enabled the existence of quorum and consensus

                                    # on failover is resolved after receiving half of the

                                    # total votes in the cluster, otherwise both these

                                    # decisions require at least one more vote than

                                    # half of the total votes.

                                    # (change requires restart)



# - Watchdog cluster membership settings for quorum computation -



#wd_remove_shutdown_nodes = off

                                    # when enabled cluster membership of properly shutdown

                                    # watchdog nodes gets revoked, After that the node does

                                    # not count towards the quorum and consensus computations



#wd_lost_node_removal_timeout = 0s

                                    # Timeout after which the cluster membership of LOST watchdog

                                    # nodes gets revoked. After that the node node does not

                                    # count towards the quorum and consensus computations

                                    # setting timeout to 0 will never revoke the membership

                                    # of LOST nodes



#wd_no_show_node_removal_timeout = 0s

                                    # Time to wait for Watchdog node to connect to the cluster.

                                    # After that time the cluster membership of NO-SHOW node gets

                                    # revoked and it does not count towards the quorum and

                                    # consensus computations

                                    # setting timeout to 0 will not revoke the membership

                                    # of NO-SHOW nodes





# - Lifecheck Setting -



# -- common --



#wd_monitoring_interfaces_list = ''

                                    # Comma separated list of interfaces names to monitor.

                                    # if any interface from the list is active the watchdog will

                                    # consider the network is fine

                                    # 'any' to enable monitoring on all interfaces except loopback

                                    # '' to disable monitoring

                                    # (change requires restart)



#wd_lifecheck_method = 'heartbeat'

                                    # Method of watchdog lifecheck ('heartbeat' or 'query' or 'external')

                                    # (change requires restart)

#wd_interval = 10

                                    # lifecheck interval (sec) > 0

                                    # (change requires restart)



# -- heartbeat mode --



#heartbeat_hostname0 = ''

                                    # Host name or IP address used

                                    # for sending heartbeat signal.

                                    # (change requires restart)

#heartbeat_port0 = 9694

                                    # Port number used for receiving/sending heartbeat signal

                                    # Usually this is the same as heartbeat_portX.

                                    # (change requires restart)

#heartbeat_device0 = ''

                                    # Name of NIC device (such like 'eth0')

                                    # used for sending/receiving heartbeat

                                    # signal to/from destination 0.

                                    # This works only when this is not empty

                                    # and pgpool has root privilege.

                                    # (change requires restart)



#heartbeat_hostname1 = ''

#heartbeat_port1 = 9694

#heartbeat_device1 = ''

#heartbeat_hostname2 = ''

#heartbeat_port2 = 9694

#heartbeat_device2 = ''



#wd_heartbeat_keepalive = 2

                                    # Interval time of sending heartbeat signal (sec)

                                    # (change requires restart)

#wd_heartbeat_deadtime = 30

                                    # Deadtime interval for heartbeat signal (sec)

                                    # (change requires restart)



# -- query mode --



#wd_life_point = 3

                                    # lifecheck retry times

                                    # (change requires restart)

#wd_lifecheck_query = 'SELECT 1'

                                    # lifecheck query to pgpool from watchdog

                                    # (change requires restart)

#wd_lifecheck_dbname = 'template1'

                                    # Database name connected for lifecheck

                                    # (change requires restart)

#wd_lifecheck_user = 'nobody'

                                    # watchdog user monitoring pgpools in lifecheck

                                    # (change requires restart)

#wd_lifecheck_password = ''

                                    # Password for watchdog user in lifecheck

                                    # Leaving it empty will make Pgpool-II to first look for the

                                    # Password in pool_passwd file before using the empty password

                                    # (change requires restart)



#------------------------------------------------------------------------------

# OTHERS

#------------------------------------------------------------------------------

#relcache_expire = 0

                                   # Life time of relation cache in seconds.

                                   # 0 means no cache expiration(the default).

                                   # The relation cache is used for cache the

                                   # query result against PostgreSQL system

                                   # catalog to obtain various information

                                   # including table structures or if it's a

                                   # temporary table or not. The cache is

                                   # maintained in a pgpool child local memory

                                   # and being kept as long as it survives.

                                   # If someone modify the table by using

                                   # ALTER TABLE or some such, the relcache is

                                   # not consistent anymore.

                                   # For this purpose, cache_expiration

                                   # controls the life time of the cache.

#relcache_size = 256

                                   # Number of relation cache

                                   # entry. If you see frequently:

                                   # "pool_search_relcache: cache replacement happend"

                                   # in the pgpool log, you might want to increate this number.



#check_temp_table = catalog

                                   # Temporary table check method. catalog, trace or none.

                                   # Default is catalog.



#check_unlogged_table = on

                                   # If on, enable unlogged table check in SELECT statements.

                                   # This initiates queries against system catalog of primary/main

                                   # thus increases load of primary.

                                   # If you are absolutely sure that your system never uses unlogged tables

                                   # and you want to save access to primary/main, you could turn this off.

                                   # Default is on.

#enable_shared_relcache = on

                                   # If on, relation cache stored in memory cache,

                                   # the cache is shared among child process.

                                   # Default is on.

                                   # (change requires restart)



#relcache_query_target = primary

                                   # Target node to send relcache queries. Default is primary node.

                                   # If load_balance_node is specified, queries will be sent to load balance node.

#------------------------------------------------------------------------------

# IN MEMORY QUERY MEMORY CACHE

#------------------------------------------------------------------------------

#memory_cache_enabled = off

                                   # If on, use the memory cache functionality, off by default

                                   # (change requires restart)

#memqcache_method = 'shmem'

                                   # Cache storage method. either 'shmem'(shared memory) or

                                   # 'memcached'. 'shmem' by default

                                   # (change requires restart)

#memqcache_memcached_host = 'localhost'

                                   # Memcached host name or IP address. Mandatory if

                                   # memqcache_method = 'memcached'.

                                   # Defaults to localhost.

                                   # (change requires restart)

#memqcache_memcached_port = 11211

                                   # Memcached port number. Mondatory if memqcache_method = 'memcached'.

                                   # Defaults to 11211.

                                   # (change requires restart)

#memqcache_total_size = 64MB

                                   # Total memory size in bytes for storing memory cache.

                                   # Mandatory if memqcache_method = 'shmem'.

                                   # Defaults to 64MB.

                                   # (change requires restart)

#memqcache_max_num_cache = 1000000

                                   # Total number of cache entries. Mandatory

                                   # if memqcache_method = 'shmem'.

                                   # Each cache entry consumes 48 bytes on shared memory.

                                   # Defaults to 1,000,000(45.8MB).

                                   # (change requires restart)

#memqcache_expire = 0

                                   # Memory cache entry life time specified in seconds.

                                   # 0 means infinite life time. 0 by default.

                                   # (change requires restart)

#memqcache_auto_cache_invalidation = on

                                   # If on, invalidation of query cache is triggered by corresponding

                                   # DDL/DML/DCL(and memqcache_expire).  If off, it is only triggered

                                   # by memqcache_expire.  on by default.

                                   # (change requires restart)

#memqcache_maxcache = 400kB

                                   # Maximum SELECT result size in bytes.

                                   # Must be smaller than memqcache_cache_block_size. Defaults to 400KB.

                                   # (change requires restart)

#memqcache_cache_block_size = 1MB

                                   # Cache block size in bytes. Mandatory if memqcache_method = 'shmem'.

                                   # Defaults to 1MB.

                                   # (change requires restart)

#memqcache_oiddir = '/var/log/pgpool/oiddir'

                                   # Temporary work directory to record table oids

                                   # (change requires restart)

#cache_safe_memqcache_table_list = ''

                                   # Comma separated list of table names to memcache

                                   # that don't write to database

                                   # Regexp are accepted

#cache_unsafe_memqcache_table_list = ''

                                   # Comma separated list of table names not to memcache

                                   # that don't write to database

                                   # Regexp are accepted

backend_hostname0 = '10.0.10.7'

backend_port0 = 5432

backend_weight0 = 1

backend_data_directory0 = '/opt/bitnami/pgpool/data'

backend_flag0 = 'ALLOW_TO_FAILOVER'

backend_hostname1 = '10.0.10.8'

backend_port1 = 5432

backend_weight1 = 1

backend_data_directory1 = '/opt/bitnami/pgpool/data'

backend_flag1 = 'ALLOW_TO_FAILOVER'

backend_hostname2 = '10.0.10.9'

backend_port2 = 5432

backend_weight2 = 1

backend_data_directory2 = '/opt/bitnami/pgpool/data'

backend_flag2 = 'ALLOW_TO_FAILOVER'

I have no name!@73d3fcf715c2:/opt/bitnami/pgpool/conf$



I hope I provided all the information and you can see anything else. If you need anything let me know.



Thanks, Cheers, Daniel






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Von: Tatsuo Ishii <ishii at sraoss.co.jp>
Gesendet: Montag, 16. Oktober 2023 04:59
An: Camarena Daniel <Daniel.Camarena at azo.com>
Cc: pgpool-general at pgpool.net
Betreff: Re: [pgpool-general: 8942] pgpool 4.4.4: reading status file: 1 th backend is set to down status



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> Hi,

>

> I've a cluster with 3 nodes. Every node runs bitnami/pgpool:4.4.4 as proxy and bitnami/postgresql-repmgr:15.4.0 as server. A PostgreSQL connection to all services (pg0, pg1, pg2, pgpool0, pgpool1, pgpool2) can be established.

> In the QA system I see that pgpool of node 1 is not running properly. It is always in state "starting" and never "healthy". Therefore orchestration is terminating and restarting the container.

> Having a look at the log of pgpool1 and comparing it with the other pgpool instances there is one difference:

> main pid 1: LOG:  reading status file: 1 th backend is set to down

> status

>

> Therefore my questions:

>

>   1.  Is there a file which buffers pg states?



If you mean "pg_status" column in show pool_nodes command, no. It is obtained from PostgreSQL on the fly when show pool_nodes command gets executed.



>   2.  How did the system get into this state?



I am not familiar with bitnami pgpool nor repmgr. So what I can do is answer from the point of pgpool view. It was caused by either failover triggered by health check (pgpool detects error / shutdown of PostgreSQL), or pcp_detach_node gets executed. I cannot tell either unless looking into pgpool log and pgpool.conf



Best reagards,

--

Tatsuo Ishii

SRA OSS LLC

English: http://www.sraoss.co.jp/index_en/<http://www.sraoss.co.jp/index_en/>

Japanese:http://www.sraoss.co.jp/
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