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After restarting the standby, poll pg_stat_replication on the upstream until the standby connects, and exit with an error if it doesn't by the timeout defined in "standby_follow_timeout". Implments GitHub #444.
117 lines
3.6 KiB
Plaintext
117 lines
3.6 KiB
Plaintext
<refentry id="repmgr-standby-follow">
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<indexterm>
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<primary>repmgr standby follow</primary>
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</indexterm>
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<refmeta>
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<refentrytitle>repmgr standby follow</refentrytitle>
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</refmeta>
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<refnamediv>
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<refname>repmgr standby follow</refname>
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<refpurpose>attach a standby to a new primary</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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<para>
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Attaches the standby to a new primary. This command requires a valid
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<filename>repmgr.conf</filename> file for the standby, either specified
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explicitly with <literal>-f/--config-file</literal> or located in a
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default location; no additional arguments are required.
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</para>
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<para>
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This command will force a restart of the standby server, which must be
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running. It can only be used to attach an active standby to the current primary node
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(and not to another standby).
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</para>
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<tip>
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<para>
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To re-add an inactive node to the replication cluster, use
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<xref linkend="repmgr-node-rejoin">.
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</para>
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</tip>
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<para>
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<command>repmgr standby follow</command> will wait up to
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<varname>standby_follow_timeout</varname> seconds (default: <literal>30</literal>)
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to verify the standby has actually connected to the new primary.
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</para>
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</refsect1>
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<refsect1>
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<title>Example</title>
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<para>
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<programlisting>
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$ repmgr -f /etc/repmgr.conf standby follow
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INFO: setting node 3's primary to node 2
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NOTICE: restarting server using "pg_ctl -l /var/log/postgres/startup.log -w -D '/var/lib/postgres/data' restart"
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waiting for server to shut down........ done
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server stopped
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waiting for server to start.... done
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server started
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NOTICE: STANDBY FOLLOW successful
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DETAIL: node 3 is now attached to node 2</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<variablelist>
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<varlistentry>
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<term><option>--dry-run</option></term>
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<listitem>
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<para>
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Check prerequisites but don't actually follow a new standby.
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</para>
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<important>
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<para>
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This does not guarantee the standby can follow the primary; in
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particular, whether the primary and standby timelines have diverged,
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can currently only be determined by actually attempting to
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attach the standby to the primary.
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</para>
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</important>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>-w</option></term>
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<term><option>--wait</option></term>
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<listitem>
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<para>
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Wait for a primary to appear. &repmgr; will wait for up to
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<varname>primary_follow_timeout</varname> seconds
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(default: 60 seconds) to verify that the standby is following the new primary.
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This value can be defined in <filename>repmgr.conf</filename>.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Event notifications</title>
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<para>
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A <literal>standby_follow</literal> <link linkend="event-notifications">event notification</link> will be generated.
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</para>
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<para>
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If provided, &repmgr; will substitute the placeholders <literal>%p</literal> with the node ID of the primary
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being followed, <literal>%c</literal> with its <literal>conninfo</literal> string, and
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<literal>%a</literal> with its node name.
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</para>
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</refsect1>
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<refsect1>
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<title>See also</title>
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<para>
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<xref linkend="repmgr-node-rejoin">
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</para>
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</refsect1>
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</refentry>
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