# Port number for backend 0
backend_weight0 = 1
# Weight for backend 0 (only in load balancing mode)
- backend_data_directory0 = '/var/lib/pgsql/11/data'
+ backend_data_directory0 = '/var/lib/pgsql/13/data'
# Data directory for backend 0
backend_flag0 = 'ALLOW_TO_FAILOVER'
# Controls various backend behavior
in format "<literal>username:encrypted password</literal>".
</para>
<para>
- if "pgpool" user is specified in <varname>PCP_USER</varname> in <filename>follow_primary.sh</filename>,
+ if <literal>pgpool</literal> user is specified in <varname>PCP_USER</varname> in <filename>follow_primary.sh</filename>,
</para>
<programlisting>
# cat /etc/pgpool-II/follow_primary.sh
...
</programlisting>
<para>
- then we create the encrypted password entry for <literal>pgpool</literal> user as below:
+ then we use <xref linkend="PG-MD5"> to create the encrypted password entry for <literal>pgpool</literal> user as below:
</para>
<programlisting>
[all servers]# echo 'pgpool:'`pg_md5 PCP passowrd` >> /etc/pgpool-II/pcp.conf
</programlisting>
<para>
- Since follow_primary_command script has to execute PCP command without entering the
+ Since <filename>follow_primary.sh</filename> script must execute PCP command without entering a
password, we need to create <filename>.pcppass</filename> in the home directory of
<productname>Pgpool-II</productname> startup user (postgres user) on each server.
</para>
<programlisting>
[all servers]# su - postgres
-[all servers]$ echo 'localhost:9898:pgpool:<pgpool user's password>' > ~/.pcppass
+[all servers]$ echo 'localhost:9898:pgpool:<pgpool user password>' > ~/.pcppass
[all servers]$ chmod 600 ~/.pcppass
</programlisting>
</sect3>
<programlisting>
[server1]# cp -p /etc/pgpool-II/recovery_1st_stage.sample /var/lib/pgsql/13/data/recovery_1st_stage
[server1]# cp -p /etc/pgpool-II/pgpool_remote_start.sample /var/lib/pgsql/13/data/pgpool_remote_start
-[server1]# chown postgres:postgres /var/lib/pgsql/11/data/{recovery_1st_stage,pgpool_remote_start}
+[server1]# chown postgres:postgres /var/lib/pgsql/13/data/{recovery_1st_stage,pgpool_remote_start}
</programlisting>
<para>
Basically, it should work if you change <emphasis>PGHOME</emphasis> according to PostgreSQL installation directory.
</para>
<note>
<para>
- If installed from RPM, the <literal>postgres</literal> user has been configured to run
- <command>ip/arping</command> via <command>sudo</command> without a password.
+ If <productname>Pgpool-II</productname> is installed using RPM, the <literal>postgres</literal>
+ user has been configured to run <command>ip/arping</command> via <command>sudo</command> without
+ a password.
<programlisting>
postgres ALL=NOPASSWD: /sbin/ip
postgres ALL=NOPASSWD: /usr/sbin/arping
cluster directory of <productname>PostgreSQL</productname> primary server (<literal>server1</literal>).
</para>
<programlisting>
- # pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 1
- Password:
- pcp_recovery_node -- Command Successful
+# pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 1
+Password:
+pcp_recovery_node -- Command Successful
- # pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 2
- Password:
- pcp_recovery_node -- Command Successful
+# pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 2
+Password:
+pcp_recovery_node -- Command Successful
</programlisting>
<para>
- After executing <command>pcp_recovery_node</command> command,
+ After executing <command>pcp_recovery_node</command> command,
verify that <literal>server2</literal> and <literal>server3</literal>
are started as <productname>PostgreSQL</productname> standby server.
</para>
Confirm the watchdog status by using <command>pcp_watchdog_info</command>. The <command>Pgpool-II</command> server which is started first run as <literal>LEADER</literal>.
</para>
<programlisting>
- # pcp_watchdog_info -h 192.168.137.150 -p 9898 -U pgpool
- Password:
- 3 YES server1:9999 Linux server1 server1
+# pcp_watchdog_info -h 192.168.137.150 -p 9898 -U pgpool
+Password:
+3 YES server1:9999 Linux server1 server1
- server1:9999 Linux server1 server1 9999 9000 4 LEADER #The Pgpool-II server started first becames "LEADER".
- server2:9999 Linux server2 server2 9999 9000 7 STANDBY #run as standby
- server3:9999 Linux server3 server3 9999 9000 7 STANDBY #run as standby
+server1:9999 Linux server1 server1 9999 9000 4 LEADER #The Pgpool-II server started first becames "LEADER".
+server2:9999 Linux server2 server2 9999 9000 7 STANDBY #run as standby
+server3:9999 Linux server3 server3 9999 9000 7 STANDBY #run as standby
</programlisting>
<para>
Stop active server <literal>server1</literal>, then <literal>server2</literal> or
service or shutdown the whole system. Here, we stop <productname>Pgpool-II</productname> service.
</para>
<programlisting>
- [server1]# systemctl stop pgpool.service
+[server1]# systemctl stop pgpool.service
- # pcp_watchdog_info -p 9898 -h 192.168.137.150 -U pgpool
- Password:
- 3 YES server2:9999 Linux server2 server2
+# pcp_watchdog_info -p 9898 -h 192.168.137.150 -U pgpool
+Password:
+3 YES server2:9999 Linux server2 server2
- server2:9999 Linux server2 server2 9999 9000 4 LEADER #server2 is promoted to LEADER
- server1:9999 Linux server1 server1 9999 9000 10 SHUTDOWN #server1 is stopped
- server3:9999 Linux server3 server3 9999 9000 7 STANDBY #server3 runs as STANDBY
+server2:9999 Linux server2 server2 9999 9000 4 LEADER #server2 is promoted to LEADER
+server1:9999 Linux server1 server1 9999 9000 10 SHUTDOWN #server1 is stopped
+server3:9999 Linux server3 server3 9999 9000 7 STANDBY #server3 runs as STANDBY
</programlisting>
<para>
Start <productname>Pgpool-II</productname> (<literal>server1</literal>) which we have stopped again,
and verify that <literal>server1</literal> runs as a standby.
</para>
<programlisting>
- [server1]# systemctl start pgpool.service
+[server1]# systemctl start pgpool.service
- [server1]# pcp_watchdog_info -p 9898 -h 192.168.137.150 -U pgpool
- Password:
- 3 YES server2:9999 Linux server2 server2
+[server1]# pcp_watchdog_info -p 9898 -h 192.168.137.150 -U pgpool
+Password:
+3 YES server2:9999 Linux server2 server2
- server2:9999 Linux server2 server2 9999 9000 4 LEADER
- server1:9999 Linux server1 server1 9999 9000 7 STANDBY
- server3:9999 Linux server3 server3 9999 9000 7 STANDBY
+server2:9999 Linux server2 server2 9999 9000 4 LEADER
+server1:9999 Linux server1 server1 9999 9000 7 STANDBY
+server3:9999 Linux server3 server3 9999 9000 7 STANDBY
</programlisting>
</sect3>
<literal>server1</literal>, and verify automatic failover.
</para>
<programlisting>
- [server1]$ pg_ctl -D /var/lib/pgsql/11/data -m immediate stop
+[server1]$ pg_ctl -D /var/lib/pgsql/13/data -m immediate stop
</programlisting>
<para>
After stopping <productname>PostgreSQL</productname> on <literal>server1</literal>,
</para>
<programlisting>
- [server3]# psql -h server3 -p 5432 -U pgpool postgres -c "select pg_is_in_recovery()"
- pg_is_in_recovery
- -------------------
- t
+[server3]# psql -h server3 -p 5432 -U pgpool postgres -c "select pg_is_in_recovery()"
+pg_is_in_recovery
+-------------------
+t
- [server2]# psql -h server2 -p 5432 -U pgpool postgres -c "select pg_is_in_recovery()"
- pg_is_in_recovery
- -------------------
- f
+[server2]# psql -h server2 -p 5432 -U pgpool postgres -c "select pg_is_in_recovery()"
+pg_is_in_recovery
+-------------------
+f
- [server2]# psql -h server2 -p 5432 -U pgpool postgres -c "select * from pg_stat_replication" -x
- -[ RECORD 1 ]----+------------------------------
- pid | 11059
- usesysid | 16392
- usename | repl
- application_name | server3
- client_addr | 192.168.137.103
- client_hostname |
- client_port | 48694
- backend_start | 2019-08-06 11:36:07.479161+09
- backend_xmin |
- state | streaming
- sent_lsn | 0/75000148
- write_lsn | 0/75000148
- flush_lsn | 0/75000148
- replay_lsn | 0/75000148
- write_lag |
- flush_lag |
- replay_lag |
- sync_priority | 0
- sync_state | async
- reply_time | 2019-08-06 11:42:59.823961+09
+[server2]# psql -h server2 -p 5432 -U pgpool postgres -c "select * from pg_stat_replication" -x
+-[ RECORD 1 ]----+------------------------------
+pid | 11059
+usesysid | 16392
+usename | repl
+application_name | server3
+client_addr | 192.168.137.103
+client_hostname |
+client_port | 48694
+backend_start | 2019-08-06 11:36:07.479161+09
+backend_xmin |
+state | streaming
+sent_lsn | 0/75000148
+write_lsn | 0/75000148
+flush_lsn | 0/75000148
+replay_lsn | 0/75000148
+write_lag |
+flush_lag |
+replay_lag |
+sync_priority | 0
+sync_state | async
+reply_time | 2019-08-06 11:42:59.823961+09
</programlisting>
</sect3>
exist in database cluster directory of current primary server <literal>server2</literal>.
</para>
<programlisting>
- # pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 0
- Password:
- pcp_recovery_node -- Command Successful
+# pcp_recovery_node -h 192.168.137.150 -p 9898 -U pgpool -n 0
+Password:
+pcp_recovery_node -- Command Successful
</programlisting>
<para>
Then verify that <literal>server1</literal> is started as a standby.
projects / pgpool2.git / commitdiff