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doc: minor fixes to BDR docs

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Also remove duplicate file.
This commit is contained in:
Ian Barwick
2018-02-05 14:01:37 +09:00
parent 1868453953
commit 48b5deebf3
2 changed files with 6 additions and 41 deletions
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37
doc/repmgr-bdr.sgml
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@@ -1,37 +0,0 @@
<chapter id="repmgrd-bdr">
<indexterm>
<primary>repmgrd</primary>
<secondary>BDR</secondary>
</indexterm>
<indexterm>
<primary>BDR</primary>
</indexterm>
<title>BDR failover with repmgrd</title>
<para>
&repmgr; 4.x provides support for monitoring BDR nodes and taking action in
case one of the nodes fails.
</para>
<note>
<simpara>
Due to the nature of BDR, it's only safe to use this solution for
a two-node scenario. Introducing additional nodes will create an inherent
risk of node desynchronisation if a node goes down without being cleanly
removed from the cluster.
</simpara>
</note>
<para>
In contrast to streaming replication, there's no concept of "promoting" a new
primary node with BDR. Instead, "failover" involves monitoring both nodes
with `repmgrd` and redirecting queries from the failed node to the remaining
active node. This can be done by using an
<link linkend="event-notifications">event notification</link> script
which is called by <application>repmgrd</application> to dynamically
reconfigure a proxy server/connection pooler such as <application>PgBouncer</application>.
</para>
<sect1 id="prerequisites" xreflable="BDR prequisites">
</sect1>
</chapter>

10
doc/repmgrd-bdr.sgml
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@@ -24,7 +24,7 @@
<para>
In contrast to streaming replication, there's no concept of "promoting" a new
primary node with BDR. Instead, "failover" involves monitoring both nodes
with `repmgrd` and redirecting queries from the failed node to the remaining
with <application>repmgrd</application> and redirecting queries from the failed node to the remaining
active node. This can be done by using an
<link linkend="event-notifications">event notification</link> script
which is called by <application>repmgrd</application> to dynamically
@@ -231,7 +231,7 @@
<term><option>%c</option></term>
<listitem>
<para>
conninfo string of the next available node (<varname>bdr_failover</varname>)
conninfo string of the next available node (<varname>bdr_failover</varname> and <varname>bdr_recovery</varname>)
</para>
</listitem>
</varlistentry>
@@ -239,7 +239,7 @@
<term><option>%a</option></term>
<listitem>
<para>
name of the next available node (<varname>bdr_failover</varname>)
name of the next available node (<varname>bdr_failover</varname> and <varname>bdr_recovery</varname>)
</para>
</listitem>
</varlistentry>
@@ -250,7 +250,9 @@
particular failover events, in this case <varname>bdr_failover</varname>.
</para>
<para>
The provided sample script (`scripts/bdr-pgbouncer.sh`) is configured as follows:
The provided sample script
(<literal><ulink url="https://raw.githubusercontent.com/2ndQuadrant/repmgr/master/scripts/bdr-pgbouncer.sh">scripts/bdr-pgbouncer.sh</ulink></literal>)
is configured as follows:
<programlisting>
event_notification_command='/path/to/bdr-pgbouncer.sh %n %e %s "%c" "%a"'</programlisting>
</para>