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doc: update documentation of "promote_command" and "service_promote_command"

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The documentation implied it would override "promote_command", which is
not the case.

"promote_command" is used by repmgrd to execute "repmgr standby promote"
(either directly or via a custom script).

"service_promote_command" can be set to specify a package-level service
command to promote the local PostgreSQL instance from standby to primary,
e.g. Debian's pg_ctlcluster. If set, this will be executed by "repmgr standby promote".

Also update code comments to clarify usage.

Related to GitHub #473.
This commit is contained in:
Ian Barwick
2018-07-16 14:40:04 +09:00
parent 69782cf703
commit 63242e2277
4 changed files with 52 additions and 22 deletions
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14
doc/configuration-file-service-commands.sgml
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@@ -50,10 +50,18 @@
<note>
<para>
It's also possible to specify a <varname>service_promote_command</varname>;
this overrides any value contained in the setting <varname>promote_command</varname>.
It's also possible to specify a <varname>service_promote_command</varname>.
This is intended for systems which provide a package-level promote command,
such as Debian's <application>pg_ctlcluster</application>.
such as Debian's <application>pg_ctlcluster</application>, to promote the
PostgreSQL from standby to primary.
</para>
<para>
If your packaging system does not provide such a command, it can be left empty,
and &repmgr; will generate the appropriate `pg_ctl ... promote` command.
</para>
<para>
Do not confuse this with <varname>promote_command</varname>, which is used
by <application>repmgrd</application> to execute <xref linkend="repmgr-standby-promote">.
</para>
</note>