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"standby switchover": improve replication connection check

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Previously repmgr would first check that a replication can be made
from the demotion candidate to the promotion candidate, however it's
preferable to sanity-check the number of available walsenders first,
to provide a more useful error message.
This commit is contained in:
Ian Barwick
2018-08-16 10:10:49 +09:00
parent 5485c06bc1
commit 457dbbd267
4 changed files with 203 additions and 165 deletions
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7
doc/switchover.sgml
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@@ -60,6 +60,13 @@
&repmgr; being able to shut down the current primary server quickly and cleanly.
</para>
<para>
Ensure that the promotion candidate has sufficient free walsenders available
(PostgreSQL configuration item <varname>max_wal_senders</varname>), and if replication
slots are in use, at least one free slot is available for the demotion candidate (
PostgreSQL configuration item <varname>max_replication_slots</varname>).
</para>
<para>
Ensure that a passwordless SSH connection is possible from the promotion candidate
(standby) to the demotion candidate (current primary). If <literal>--siblings-follow</literal>