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cluster show: display timeline ID

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This helps provide a better picture of the state of the cluster, i.e.
making it more obvious whether there's been a timeline divergence.

This also provides infrastructure for further improvements in cluster
status display and diagnosis.

Note this is only available in PostgreSQL 9.6 and later as it relies
on the SQL functions for interrogating pg_control, which can be executed
remotely. As PostgreSQL 9.5 will shortly be the only community-supported
version without these functions, it's not worth the effort of trying
to duplicate their functionality.
This commit is contained in:
Ian Barwick
2019-05-27 09:15:12 +09:00
parent df6d160d2e
commit c560dfbbce
6 changed files with 133 additions and 23 deletions
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7
doc/appendix-release-notes.xml
View File

@@ -97,6 +97,13 @@
<listitem>
<para>
<link linkend="repmgr-cluster-show"><command>repmgr cluster show</command></link>:
display each node's timeline ID (PostgreSQL 9.6 and later only).
</para>
</listitem>
<listitem>
<para>
<link linkend="repmgr-cluster-show"><command>repmgr cluster show</command></link>
and <link linkend="repmgr-daemon-status"><command>repmgr daemon status</command></link>:
show the upstream node name as reported by each individual node - this helps visualise

12
doc/repmgr-cluster-show.xml
View File

@@ -22,7 +22,9 @@
directly and can be run on any node in the cluster; this is also useful when analyzing
connectivity from a particular node.
</para>
<para>
For PostgreSQL 9.6 and later, the output will also contain the node's current timeline ID.
</para>
<para>
Node availability is tested by connecting from the node where
<command>repmgr cluster show</command> is executed, and does not necessarily imply the node
@@ -52,11 +54,11 @@
<programlisting>
$ repmgr -f /etc/repmgr.conf cluster show
ID | Name | Role | Status | Upstream | Location | Priority | Connection string
ID | Name | Role | Status | Upstream | Location | Priority | Timeline | Connection string
----+-------+---------+-----------+----------+----------+----------+-----------------------------------------
1 | node1 | primary | * running | | default | 100 | host=db_node1 dbname=repmgr user=repmgr
2 | node2 | standby | running | node1 | default | 100 | host=db_node2 dbname=repmgr user=repmgr
3 | node3 | standby | running | node1 | default | 100 | host=db_node3 dbname=repmgr user=repmgr</programlisting>
1 | node1 | primary | * running | | default | 100 | 1 | host=db_node1 dbname=repmgr user=repmgr
2 | node2 | standby | running | node1 | default | 100 | 1 | host=db_node2 dbname=repmgr user=repmgr
3 | node3 | standby | running | node1 | default | 100 | 1 | host=db_node3 dbname=repmgr user=repmgr</programlisting>
</para>
</refsect1>
<refsect1>