+
+PostgreSQL 15 : Streaming Replication2023/07/05+ |
+
| + |
+
+Configure PostgreSQL Streaming Replication.
++This configuration is common Primary/Replica settings. + |
+
| [1] | ++ + | +
| [2] | +Configure Primary Node. + | +
|
+
+root@www:~#
+vi /etc/postgresql/15/main/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 /etc/postgresql/15/main/pg_hba.conf # add to the end +# 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 +postgres@www:~$ createuser --replication -P rep_user +Enter password for new role: # set any password +Enter it again: +
+postgres@www:~$
+root@www:~# exit
+systemctl restart postgresql
+ |
+
| [3] | +Configure Replica Node. + | +
|
+
+
+# stop PostgreSQL and remove existing data +root@node01:~# systemctl stop postgresql +root@node01:~# rm -rf /var/lib/postgresql/15/main/*
+
+
+# get backup from Primary Node +root@node01:~# su - postgres +postgres@node01:~$ pg_basebackup -R -h www.srv.world -U rep_user -D /var/lib/postgresql/15/main -P +Password: # password of replication user +30547/30547 kB (100%), 1/1 tablespace +postgres@node01:~$ exit
+
+root@node01:~#
+vi /etc/postgresql/15/main/postgresql.conf
+
+# line 60 : uncomment and change +listen_addresses = ' * '
+
+
+root@node01:~# # line 335 : uncomment +hot_standby = on + systemctl start postgresql + |
+
| [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. + | +
|
+postgres@www:~$ 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 | 15/main | 10.0.0.51 | streaming | 1 | sync +(1 row) ++ |
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