mirror of
https://github.com/EnterpriseDB/repmgr.git
synced 2026-03-22 22:56:29 +00:00
10425d6967
As they are now XML files. In PostgreSQL itself they remain with the .sgml suffix for backwards compatibility, but that's not important for us.
50 lines
2.1 KiB
XML
50 lines
2.1 KiB
XML
<chapter id="follow-new-primary">
|
|
<title>Following a new primary</title>
|
|
|
|
<indexterm>
|
|
<primary>Following a new primary</primary>
|
|
<seealso>repmgr standby follow</seealso>
|
|
</indexterm>
|
|
|
|
<para>
|
|
Following the failure or removal of the replication cluster's existing primary
|
|
server, <xref linkend="repmgr-standby-follow"/> can be used to make "orphaned" standbys
|
|
follow the new primary and catch up to its current state.
|
|
</para>
|
|
<para>
|
|
To demonstrate this, assuming a replication cluster in the same state as the
|
|
end of the preceding section (<xref linkend="promoting-standby"/>),
|
|
execute this:
|
|
<programlisting>
|
|
$ repmgr -f /etc/repmgr.conf standby follow
|
|
INFO: changing node 3's primary to node 2
|
|
NOTICE: restarting server using "pg_ctl -l /var/log/postgresql/startup.log -w -D '/var/lib/postgresql/data' restart"
|
|
waiting for server to shut down......... done
|
|
server stopped
|
|
waiting for server to start.... done
|
|
server started
|
|
NOTICE: STANDBY FOLLOW successful
|
|
DETAIL: node 3 is now attached to node 2
|
|
</programlisting>
|
|
</para>
|
|
<para>
|
|
The standby is now replicating from the new primary and
|
|
<command><link linkend="repmgr-cluster-show">repmgr cluster show</link></command>
|
|
output reflects this:
|
|
<programlisting>
|
|
$ repmgr -f /etc/repmgr.conf cluster show
|
|
ID | Name | Role | Status | Upstream | Location | Connection string
|
|
----+-------+---------+-----------+----------+----------+--------------------------------------
|
|
1 | node1 | primary | - failed | | default | host=node1 dbname=repmgr user=repmgr
|
|
2 | node2 | primary | * running | | default | host=node2 dbname=repmgr user=repmgr
|
|
3 | node3 | standby | running | node2 | default | host=node3 dbname=repmgr user=repmgr</programlisting>
|
|
</para>
|
|
<para>
|
|
Note that with cascading replication, <command>repmgr standby follow</command> can also be
|
|
used to detach a standby from its current upstream server and follow the
|
|
primary. However it's currently not possible to have it follow another standby;
|
|
we hope to improve this in a future release.
|
|
</para>
|
|
|
|
</chapter>
|