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standby switchover: list nodes which will remain attatched to the old primary

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If --siblings-follow is not supplied, list all nodes which repmgr considers
to be siblings (this will include the witness server, if in use), and
which will remain attached to the old primary.
This commit is contained in:
Ian Barwick
2019-04-02 10:45:45 +09:00
parent bb0fd944ae
commit 2249b79811
3 changed files with 27 additions and 5 deletions
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10
doc/repmgr-standby-switchover.sgml
View File

@@ -22,10 +22,10 @@
passwordless SSH connection to the current primary.
</para>
<para>
If other standbys are connected to the demotion candidate, &repmgr; can instruct
If other nodes are connected to the demotion candidate, &repmgr; can instruct
these to follow the new primary if the option <literal>--siblings-follow</literal>
is specified. This requires a passwordless SSH connection between the promotion
candidate (new primary) and the standbys attached to the demotion candidate
candidate (new primary) and the nodes attached to the demotion candidate
(existing primary).
</para>
<note>
@@ -150,7 +150,11 @@
<term><option>--siblings-follow</option></term>
<listitem>
<para>
Have standbys attached to the old primary follow the new primary.
Have nodes attached to the old primary follow the new primary.
</para>
<para>
This will also ensure that a witness node, if in use, is updated
with the new primary's data.
</para>
</listitem>
</varlistentry>

3
doc/switchover.sgml
View File

@@ -72,7 +72,8 @@
Ensure that a passwordless SSH connection is possible from the promotion candidate
(standby) to the demotion candidate (current primary). If <literal>--siblings-follow</literal>
will be used, ensure that passwordless SSH connections are possible from the
promotion candidate to all standbys attached to the demotion candidate.
promotion candidate to all nodes attached to the demotion candidate
(including the witness server, if in use).
</para>
<note>

19
repmgr-action-standby.c
View File

@@ -3561,9 +3561,26 @@ do_standby_switchover(void)
{
if (sibling_nodes.node_count > 0)
{
PQExpBufferData nodes;
NodeInfoListCell *cell;
initPQExpBuffer(&nodes);
for (cell = sibling_nodes.head; cell; cell = cell->next)
{
appendPQExpBuffer(&nodes,
" %s (node ID: %i)",
cell->node_info->node_name,
cell->node_info->node_id);
if (cell->next)
appendPQExpBufferStr(&nodes, "\n");
}
log_warning(_("%i sibling nodes found, but option \"--siblings-follow\" not specified"),
sibling_nodes.node_count);
log_detail(_("these nodes will remain attached to the current primary"));
log_detail(_("these nodes will remain attached to the current primary:\n%s"), nodes.data);
termPQExpBuffer(&nodes);
}
}
else