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node rejoin: handle unclean shutdown in Pg13

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From PostgreSQL 13, pg_rewind will automatically handle an unclean
shutdown itself, so as long as --force-rewind was provided, so there
is no need to fail with an error.

Note that pg_rewind handles the unclean shutdown by starting PostgreSQL
in single user mode, which it does before performing any checks as
to whether a rewind is actually necessary.

However pg_rewind doesn't take into account the possible presence
of a standby.signal file, so we remove that and recreate it after
pg_rewind was executed.
This commit is contained in:
Ian Barwick
2020-10-13 10:18:29 +09:00
parent d62743ddf4
commit 5f986bc981
7 changed files with 163 additions and 58 deletions
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26
doc/repmgr-node-rejoin.xml
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@@ -212,9 +212,18 @@
a standby to the current primary, not another standby.
</para>
<para>
The node must have been shut down cleanly; if this was not the case, it will
need to be manually started (remove any existing <filename>recovery.conf</filename> file first)
until it has reached a consistent recovery point, then shut down cleanly.
The node's PostgreSQL instance must have been shut down cleanly. If this was not the
case, it will need to be started up until it has reached a consistent recovery point,
then shut down cleanly.
</para>
<para>
In PostgreSQL 13 and later, this will be done automatically
if the <option>--force-rewind</option> is provided (even if an actual rewind
is not necessary).
</para>
<para>
With PostgreSQL 12 and earlier, PostgreSQL will need to
be started and shut down manually; see below for the best way to do this.
</para>
<tip>
<para>
@@ -226,11 +235,14 @@
rm -f /var/lib/pgsql/data/recovery.conf
postgres --single -D /var/lib/pgsql/data/ &lt; /dev/null</programlisting>
</para>
<para>
Note that <filename>standby.signal</filename> (PostgreSQL 11 and earlier:
<filename>recovery.conf</filename>) <emphasis>must</emphasis> be removed
from the data directory for PostgreSQL to be able to start in single
user mode.
</para>
</tip>
<para>
&repmgr; will attempt to verify whether the node can rejoin as-is, or whether
<command>pg_rewind</command> must be used (see following section).
</para>
</refsect1>
<refsect1 id="repmgr-node-rejoin-pg-rewind" xreflabel="Using pg_rewind">