PostgreSQL 9.2 : Replication Settings2015/07/26 |
Configure PostgreSQL Replication settings. This configuration is Master-Slave settings.
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[1] | Configure Master Server. |
[root@dlp ~]#
[root@dlp ~]# yum -y install postgresql-server postgresql-setup initdb Initializing database ... OK
[root@dlp ~]#
vi /var/lib/pgsql/data/postgresql.conf # line 59: uncomment and change listen_addresses = ' * '
# line 165: uncomment and change wal_level = hot_standby
# line 168: uncomment and change # on ⇒ sync # remote_write ⇒ memory sync # local ⇒ slave is asynchronous # off ⇒ asynchronous synchronous_commit = local
# line 194: uncomment and change (enable archive_mode) archive_mode = on
# line 196: uncomment and change (command to get archives) archive_command = ' cp %p /var/lib/pgsql/archive/%f '
# line 212: uncomment and change (slave servers + 1) max_wal_senders = 2
# line 214: uncomment and change wal_keep_segments = 10
# line 221: uncomment and change (any name you like) synchronous_standby_names = ' slave01 '
[root@dlp ~]#
vi /var/lib/pgsql/data/pg_hba.conf # add to the end # host replication [replication user] [allowed IP addresses] password host replication replica 127.0.0.1/32 md5 host replication replica 10.0.0.30/32 md5 host replication replica 10.0.0.51/32 md5 systemctl start postgresql [root@dlp ~]# systemctl enable postgresql -bash-4.2$ createuser --replication -P replica Enter password for new role: Enter it again: |
[2] | If Firewalld is running, allow PostgreSQL service. |
[root@dlp ~]# firewall-cmd --add-service=postgresql --permanent success [root@dlp ~]# firewall-cmd --reload success |
[3] | Configure Slave Server. |
[root@node01 ~]#
yum -y install postgresql-server
[root@node01 ~]#
su - postgres # get backup from Master Server -bash-4.2$ pg_basebackup -h 10.0.0.30 -U replica -D /var/lib/pgsql/data -P --xlog Password: # "replica" user's password
-bash-4.2$
vi /var/lib/pgsql/data/postgresql.conf # line 230: uncomment and change hot_standby = on
-bash-4.2$
cp /usr/share/pgsql/recovery.conf.sample /var/lib/pgsql/data/recovery.conf -bash-4.2$ vi /var/lib/pgsql/data/recovery.conf # line 44: uncomment and change (command to get archives) restore_command = ' scp 10.0.0.30:/var/lib/pgsql/archive/%f %p '
# line 108: uncomment and change standby_mode = on
# line 115: uncomment and change (connection info to Master Server) primary_conninfo = ' host=10.0.0.30 port=5432 user=replica password=password application_name=slave01 '
exit logout [root@node01 ~]# systemctl start postgresql [root@node01 ~]# systemctl enable postgresql |
[4] | It's OK all if result of the command below is like follows. Make sure the setting works normally to create databases on Master Server. |
-bash-4.2$ psql -c "select application_name, state, sync_priority, sync_state from pg_stat_replication;" application_name | state | sync_priority | sync_state ------------------+-----------+---------------+------------ slave01 | streaming | 1 | sync (1 row) |
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