PostgreSQL 15 : Streaming Replication2024/02/09

	Configure PostgreSQL Streaming Replication. This configuration is common Primary/Replica settings.
[1]	Install and start PostgreSQL Server on all Nodes, refer to here [1].
[2]	Configure Primary Node.

root@www:~ #

vi /var/db/postgres/data15/postgresql.conf

# line 60 : uncomment and change

listen_addresses = '

# line 205 : uncomment

wal_level = replica

# line 210 : uncomment

synchronous_commit = on

# line 308 : uncomment (max number of concurrent connections from streaming clients)

max_wal_senders = 10

# line 322 : uncomment and change

synchronous_standby_names = '

root@www:~ #

vi /var/db/postgres/data15/pg_hba.conf

# add to last line
# host replication [replication user] [allowed network] [authentication method]

host    replication     rep_user        10.0.0.30/32            scram-sha-256
host    replication     rep_user        10.0.0.51/32            scram-sha-256

# create a user for replication

root@www:~ #

su - postgres -c "createuser --replication -P rep_user"

Enter password for new role:

# set any password

Enter it again:

root@www:~ #

service postgresql restart

[3]	Configure Replica Node.

# stop PostgreSQL and remove existing data

root@node01:~ #

service postgresql stop

root@node01:~ #

rm -rf /var/db/postgres/data15/*

# get backup from Primary Node

root@node01:~ #

su - postgres -c "pg_basebackup -R -h www.srv.world -U rep_user -D /var/db/postgres/data15 -P"

Password:

# password of replication user

31246/31246 kB (100%), 1/1 tablespace

root@node01:~ #

vi /var/db/postgres/data15/postgresql.conf

# line 335 : uncomment

hot_standby = on

root@node01:~ #

service postgresql start

[4]	That's OK if result of the command below on Primary Node is like follows. Verify the setting works normally to create databases or to insert data on Primary Node.

root@www:~ #

su - postgres -c 'psql -c "select usename, application_name, client_addr, state, sync_priority, sync_state from pg_stat_replication;"'

 usename  | application_name | client_addr |   state   | sync_priority | sync_state
----------+------------------+-------------+-----------+---------------+------------
 rep_user | walreceiver      | 10.0.0.51   | streaming |             1 | sync
(1 row)

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