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node check: accept -S/--superuser option

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This is mainly useful for the --data-directory-config option, which
requires permission to read pg_settings to verify that the data
directory configured in "repmgr.conf" matches the data directory
actually in use.

If pg_settings read permission is not available, repmgr will fall
back to a simple check that the data directory configured in
"repmgr.conf" is a valid PostgreSQL directory. This is not entirely
foolproof, as it's possible PostgreSQL could be using a different
data directory.
This commit is contained in:
Ian Barwick
2020-03-23 17:07:42 +09:00
parent 06f0e5e94f
commit e561ddc8d3
5 changed files with 93 additions and 23 deletions
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38
doc/repmgr-node-check.xml
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@@ -57,20 +57,20 @@
<listitem>
<simpara>
<literal>--role</literal>: checks if the node has the expected role
<option>--role</option>: checks if the node has the expected role
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--replication-lag</literal>: checks if the node is lagging by more than
<option>--replication-lag</option>: checks if the node is lagging by more than
<varname>replication_lag_warning</varname> or <varname>replication_lag_critical</varname>
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--archive-ready</literal>: checks for WAL files which have not yet been archived,
<option>--archive-ready</option>: checks for WAL files which have not yet been archived,
and returns <literal>WARNING</literal> or <literal>CRITICAL</literal> if the number
exceeds <varname>archive_ready_warning</varname> or <varname>archive_ready_critical</varname> respectively.
</simpara>
@@ -78,25 +78,25 @@
<listitem>
<simpara>
<literal>--downstream</literal>: checks that the expected downstream nodes are attached
<option>--downstream</option>: checks that the expected downstream nodes are attached
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--slots</literal>: checks there are no inactive physical replication slots
<option>--slots</option>: checks there are no inactive physical replication slots
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--missing-slots</literal>: checks there are no missing physical replication slots
<option>--missing-slots</option>: checks there are no missing physical replication slots
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--data-directory-config</literal>: checks the data directory configured in
<option>--data-directory-config</option>: checks the data directory configured in
<filename>repmgr.conf</filename> matches the actual data directory.
This check is not directly related to replication, but is useful to verify &repmgr;
is correctly configured.
@@ -108,6 +108,22 @@
</para>
</refsect1>
<refsect1>
<title>Connection options</title>
<para>
<itemizedlist spacing="compact" mark="bullet">
<listitem>
<simpara>
<option>-S</option>/<option>--superuser</option>: connect as the
named superuser instead of the &repmgr; user
</simpara>
</listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1>
<title>Output format</title>
<para>
@@ -115,14 +131,14 @@
<listitem>
<simpara>
<literal>--csv</literal>: generate output in CSV format (not available
<option>--csv</option>: generate output in CSV format (not available
for individual checks)
</simpara>
</listitem>
<listitem>
<simpara>
<literal>--nagios</literal>: generate output in a Nagios-compatible format
<option>--nagios</option>: generate output in a Nagios-compatible format
(for individual checks only)
</simpara>
</listitem>
@@ -130,13 +146,15 @@
</para>
</refsect1>
<refsect1>
<title>Exit codes</title>
<para>
When executing <command>repmgr node check</command> with one of the individual
checks listed above, &repmgr; will emit one of the following Nagios-style exit codes
(even if <literal>--nagios</literal> is not supplied):
(even if <option>--nagios</option> is not supplied):
<itemizedlist spacing="compact" mark="bullet">