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52 lines
2.7 KiB
Plaintext
52 lines
2.7 KiB
Plaintext
<chapter id="repmgrd-configuration">
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<title>repmgrd configuration</title>
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<para>
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To use <command>repmgrd</command>, its associated function library must be
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included in <filename>postgresql.conf</filename> with:
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<programlisting>
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shared_preload_libraries = 'repmgr'</programlisting>
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</para>
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<para>
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Changing this setting requires a restart of PostgreSQL; for more details see
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the <ulink url="https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">PostgreSQL documentation</ulink>.
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</para>
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<para>
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Additionally the following <command>repmgrd</command> options *must* be set in
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<filename>repmgr.conf</filename> (adjust configuration file locations as appropriate):
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<programlisting>
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failover=automatic
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promote_command='repmgr standby promote -f /etc/repmgr.conf --log-to-file'
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follow_command='repmgr standby follow -f /etc/repmgr.conf --log-to-file --upstream-node-id=%n'</programlisting>
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</para>
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<para>
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Note that the <literal>--log-to-file</literal> option will cause
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output generated by the &repmgr; command, when executed by <command>repmgrd</command>,
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to be logged to the same destination configured to receive log output for <command>repmgrd</command>.
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See <filename>repmgr.conf.sample</filename> for further <command>repmgrd</command>-specific settings.
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</para>
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<para>
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When <varname>failover</varname> is set to <literal>automatic</literal>, upon detecting failure
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of the current primary, <command>repmgrd</command> will execute one of
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<varname>promote_command</varname> or <varname>follow_command</varname>,
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depending on whether the current server is to become the new primary, or
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needs to follow another server which has become the new primary. Note that
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these commands can be any valid shell script which results in one of these
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two actions happening, but if &repmgr;'s <command>standby follow</command> or
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<command>standby promote</command>
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commands are not executed (either directly as shown here, or from a script which
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performs other actions), the &repmgr; metadata will not be updated and
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&repmgr; will no longer function reliably.
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</para>
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<para>
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The <varname>follow_command</varname> should provide the <literal>--upstream-node-id=%n</literal>
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option to <command>repmgr standby follow</command>; the <literal>%n</literal> will be replaced by
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<command>repmgrd</command> with the ID of the new primary node. If this is not provided, &repmgr;
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will attempt to determine the new primary by itself, but if the
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original primary comes back online after the new primary is promoted, there is a risk that
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<command>repmgr standby follow</command> will result in the node continuing to follow
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the original primary.
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</para>
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</chapter>
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