mirror of
https://github.com/EnterpriseDB/repmgr.git
synced 2026-06-01 03:39:05 +00:00
Documentation: update markup
This commit is contained in:
Ian Barwick
+14
-14
@@ -15,7 +15,7 @@
|
||||
<para>
|
||||
&repmgr; 3.x builds on the improved replication facilities added
|
||||
in PostgreSQL 9.3, as well as improved automated failover support
|
||||
via <command>repmgrd</command>, and is not compatible with PostgreSQL 9.2
|
||||
via <application>repmgrd</application>, and is not compatible with PostgreSQL 9.2
|
||||
and earlier. We recommend upgrading to &repmgr; 4, as the &repmgr; 3.x
|
||||
series will no longer be actively maintained.
|
||||
</para>
|
||||
@@ -126,19 +126,19 @@
|
||||
|
||||
<sect2 id="faq-repmgr-shared-preload-libaries-no-repmgrd" xreflabel="shared_preload_libraries without repmgrd">
|
||||
<title>Do I need to include <literal>shared_preload_libraries = 'repmgr'</literal>
|
||||
in <filename>postgresql.conf</filename> if I'm not using <command>repmgrd</command>?</title>
|
||||
in <filename>postgresql.conf</filename> if I'm not using <application>repmgrd</application>?</title>
|
||||
<para>
|
||||
No, the <literal>repmgr</literal> shared library is only needed when running <command>repmgrd</command>.
|
||||
If you later decide to run <command>repmgrd</command>, you just need to add
|
||||
No, the <literal>repmgr</literal> shared library is only needed when running <application>repmgrd</application>.
|
||||
If you later decide to run <application>repmgrd</application>, you just need to add
|
||||
<literal>shared_preload_libraries = 'repmgr'</literal> and restart PostgreSQL.
|
||||
</para>
|
||||
</sect2>
|
||||
|
||||
<sect2 id="faq-repmgr-permissions" xreflabel="Replication permission problems">
|
||||
<title>I've provided replication permission for the <literal>repmgr</literal> user in <filename>pg_hba.conf</filename>
|
||||
but <command>repmgr</command>/<command>repmgrd</command> complains it can't connect to the server... Why?</title>
|
||||
but <command>repmgr</command>/<application>repmgrd</application> complains it can't connect to the server... Why?</title>
|
||||
<para>
|
||||
<command>repmgr</command> and<command>repmgrd</command> need to be able to connect to the repmgr database
|
||||
<command>repmgr</command> and<application>repmgrd</application> need to be able to connect to the repmgr database
|
||||
with a normal connection to query metadata. The <literal>replication</literal> connection
|
||||
permission is for PostgreSQL's streaming replication (and doesn't necessarily need to be the <literal>repmgr</literal> user).
|
||||
</para>
|
||||
@@ -170,7 +170,7 @@
|
||||
</sect1>
|
||||
|
||||
<sect1 id="faq-repmgrd" xreflabel="repmgrd">
|
||||
<title><command>repmgrd</command></title>
|
||||
<title><application>repmgrd</application></title>
|
||||
|
||||
|
||||
<sect2 id="faq-repmgrd-prevent-promotion" xreflabel="Prevent standby from being promoted to primary">
|
||||
@@ -186,12 +186,12 @@
|
||||
</sect2>
|
||||
|
||||
<sect2 id="faq-repmgrd-delayed-standby" xreflabel="Delayed standby support">
|
||||
<title>Does <command>repmgrd</command> support delayed standbys?</title>
|
||||
<title>Does <application>repmgrd</application> support delayed standbys?</title>
|
||||
<para>
|
||||
<command>repmgrd</command> can monitor delayed standbys - those set up with
|
||||
<application>repmgrd</application> can monitor delayed standbys - those set up with
|
||||
<varname>recovery_min_apply_delay</varname> set to a non-zero value
|
||||
in <filename>recovery.conf</filename> - but as it's not currently possible
|
||||
to directly examine the value applied to the standby, <command>repmgrd</command>
|
||||
to directly examine the value applied to the standby, <application>repmgrd</application>
|
||||
may not be able to properly evaluate the node as a promotion candidate.
|
||||
</para>
|
||||
<para>
|
||||
@@ -200,13 +200,13 @@
|
||||
<filename>repmgr.conf</filename>.
|
||||
</para>
|
||||
<para>
|
||||
Note that after registering a delayed standby, <command>repmgrd</command> will only start
|
||||
Note that after registering a delayed standby, <application>repmgrd</application> will only start
|
||||
once the metadata added in the master node has been replicated.
|
||||
</para>
|
||||
</sect2>
|
||||
|
||||
<sect2 id="faq-repmgrd-logfile-rotate" xreflabel="repmgrd logfile rotation">
|
||||
<title>How can I get <command>repmgrd</command> to rotate its logfile?</title>
|
||||
<title>How can I get <application>repmgrd</application> to rotate its logfile?</title>
|
||||
<para>
|
||||
Configure your system's <literal>logrotate</literal> service to do this; see <xref linkend="repmgrd-log-rotation">.
|
||||
</para>
|
||||
@@ -214,11 +214,11 @@
|
||||
</sect2>
|
||||
|
||||
<sect2 id="faq-repmgrd-recloned-no-start" xreflabel="repmgrd not restarting after node cloned">
|
||||
<title>I've recloned a failed master as a standby, but <command>repmgrd</command> refuses to start?</title>
|
||||
<title>I've recloned a failed master as a standby, but <application>repmgrd</application> refuses to start?</title>
|
||||
<para>
|
||||
Check you registered the standby after recloning. If unregistered, the standby
|
||||
cannot be considered as a promotion candidate even if <varname>failover</varname> is set to
|
||||
<literal>automatic</literal>, which is probably not what you want. <command>repmgrd</command> will start if
|
||||
<literal>automatic</literal>, which is probably not what you want. <application>repmgrd</application> will start if
|
||||
<varname>failover</varname> is set to <literal>manual</literal> so the node's replication status can still
|
||||
be monitored, if desired.
|
||||
</para>
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<chapter id="event-notifications" xreflabel="event notifications">
|
||||
<title>Event Notifications</title>
|
||||
<para>
|
||||
Each time &repmgr; or <command>repmgrd</command> perform a significant event, a record
|
||||
Each time &repmgr; or <application>repmgrd</application> perform a significant event, a record
|
||||
of that event is written into the <literal>repmgr.events</literal> table together with
|
||||
a timestamp, an indication of failure or success, and further details
|
||||
if appropriate. This is useful for gaining an overview of events
|
||||
|
||||
@@ -31,7 +31,7 @@
|
||||
|
||||
<para>
|
||||
A dedicated system user for &repmgr; is *not* required; as many &repmgr; and
|
||||
<command>repmgrd</command> actions require direct access to the PostgreSQL data directory,
|
||||
<application>repmgrd</application> actions require direct access to the PostgreSQL data directory,
|
||||
these commands should be executed by the <literal>postgres</literal> user.
|
||||
</para>
|
||||
|
||||
|
||||
+3
-3
@@ -57,7 +57,7 @@
|
||||
<listitem>
|
||||
<simpara>
|
||||
This is the action which occurs if a primary server fails and a suitable standby
|
||||
is promoted as the new primary. The <command>repmgrd</command> daemon supports automatic failover
|
||||
is promoted as the new primary. The <application>repmgrd</application> daemon supports automatic failover
|
||||
to minimise downtime.
|
||||
</simpara>
|
||||
</listitem>
|
||||
@@ -173,7 +173,7 @@
|
||||
</listitem>
|
||||
<listitem>
|
||||
<simpara><literal>repmgr.monitoring_history</literal>: historical standby monitoring information
|
||||
written by <command>repmgrd</command></simpara>
|
||||
written by <application>repmgrd</application></simpara>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
</para>
|
||||
@@ -189,7 +189,7 @@
|
||||
name of the server's upstream node</simpara>
|
||||
</listitem>
|
||||
<listitem>
|
||||
<simpara>repmgr.replication_status: when <command>repmgrd</command>'s monitoring is enabled, shows
|
||||
<simpara>repmgr.replication_status: when <application>repmgrd</application>'s monitoring is enabled, shows
|
||||
current monitoring status for each standby.</simpara>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
|
||||
+1
-1
@@ -286,7 +286,7 @@
|
||||
slot_name |
|
||||
config_file | /etc/repmgr.conf</programlisting>
|
||||
<para>
|
||||
Each server in the replication cluster will have its own record. If <command>repmgrd</command>
|
||||
Each server in the replication cluster will have its own record. If <application>repmgrd</application>
|
||||
is in use, the fields <literal>upstream_node_id</literal>, <literal>active</literal> and
|
||||
<literal>type</literal> will be updated when the node's status or role changes.
|
||||
</para>
|
||||
|
||||
@@ -15,7 +15,7 @@
|
||||
</para>
|
||||
<note>
|
||||
<simpara>
|
||||
Monitoring history will only be written if <command>repmgrd</command> is active, and
|
||||
Monitoring history will only be written if <application>repmgrd</application> is active, and
|
||||
<varname>monitoring_history</varname> is set to <literal>true</literal> in
|
||||
<filename>repmgr.conf</filename>.
|
||||
</simpara>
|
||||
|
||||
@@ -12,7 +12,7 @@
|
||||
<para>
|
||||
If the standby promotion succeeds, the server will not need to be
|
||||
restarted. However any other standbys will need to follow the new server,
|
||||
by using <xref linkend="repmgr-standby-follow">; if <command>repmgrd</command>
|
||||
by using <xref linkend="repmgr-standby-follow">; if <application>repmgrd</application>
|
||||
is active, it will handle this automatically.
|
||||
</para>
|
||||
</chapter>
|
||||
|
||||
@@ -4,7 +4,7 @@
|
||||
<para>
|
||||
<command>repmgr standby register</command> adds a standby's information to
|
||||
the &repmgr; metadata. This command needs to be executed to enable
|
||||
promote/follow operations and to allow <command>repmgrd</command> to work with the node.
|
||||
promote/follow operations and to allow <application>repmgrd</application> to work with the node.
|
||||
An existing standby can be registered using this command. Execute with the
|
||||
<literal>--dry-run</literal> option to check what would happen without actually registering the
|
||||
standby.
|
||||
@@ -15,7 +15,7 @@
|
||||
<para>
|
||||
Depending on your environment and workload, it may take some time for
|
||||
the standby's node record to propagate from the primary to the standby. Some
|
||||
actions (such as starting <command>repmgrd</command>) require that the standby's node record
|
||||
actions (such as starting <application>repmgrd</application>) require that the standby's node record
|
||||
is present and up-to-date to function correctly.
|
||||
</para>
|
||||
<para>
|
||||
|
||||
@@ -18,7 +18,7 @@
|
||||
possible without actually changing the status of either node.
|
||||
</para>
|
||||
<para>
|
||||
<command>repmgrd</command> should not be active on any nodes while a switchover is being
|
||||
<application>repmgrd</application> should not be active on any nodes while a switchover is being
|
||||
executed. This restriction may be lifted in a later version.
|
||||
</para>
|
||||
<para>
|
||||
|
||||
@@ -2,7 +2,7 @@
|
||||
<title>Automatic failover with repmgrd</title>
|
||||
|
||||
<para>
|
||||
<command>repmgrd</command> is a management and monitoring daemon which runs
|
||||
<application>repmgrd</application> is a management and monitoring daemon which runs
|
||||
on each node in a replication cluster. It can automate actions such as
|
||||
failover and updating standbys to follow the new primary, as well as
|
||||
providing monitoring information about the state of each standby.
|
||||
|
||||
@@ -3,7 +3,7 @@
|
||||
<para>
|
||||
Cascading replication - where a standby can connect to an upstream node and not
|
||||
the primary server itself - was introduced in PostgreSQL 9.2. &repmgr; and
|
||||
<command>repmgrd</command> support cascading replication by keeping track of the relationship
|
||||
<application>repmgrd</application> support cascading replication by keeping track of the relationship
|
||||
between standby servers - each node record is stored with the node id of its
|
||||
upstream ("parent") server (except of course the primary server).
|
||||
</para>
|
||||
|
||||
@@ -1,7 +1,7 @@
|
||||
<chapter id="repmgrd-configuration">
|
||||
<title>repmgrd configuration</title>
|
||||
<para>
|
||||
To use <command>repmgrd</command>, its associated function library must be
|
||||
To use <application>repmgrd</application>, its associated function library must be
|
||||
included in <filename>postgresql.conf</filename> with:
|
||||
|
||||
<programlisting>
|
||||
@@ -12,7 +12,7 @@
|
||||
the <ulink url="https://www.postgresql.org/docs/current/static/runtime-config-client.html#GUC-SHARED-PRELOAD-LIBRARIES">PostgreSQL documentation</ulink>.
|
||||
</para>
|
||||
<para>
|
||||
Additionally the following <command>repmgrd</command> options *must* be set in
|
||||
Additionally the following <application>repmgrd</application> options *must* be set in
|
||||
<filename>repmgr.conf</filename> (adjust configuration file locations as appropriate):
|
||||
<programlisting>
|
||||
failover=automatic
|
||||
@@ -21,13 +21,13 @@
|
||||
</para>
|
||||
<para>
|
||||
Note that the <literal>--log-to-file</literal> option will cause
|
||||
output generated by the &repmgr; command, when executed by <command>repmgrd</command>,
|
||||
to be logged to the same destination configured to receive log output for <command>repmgrd</command>.
|
||||
See <filename>repmgr.conf.sample</filename> for further <command>repmgrd</command>-specific settings.
|
||||
output generated by the &repmgr; command, when executed by <application>repmgrd</application>,
|
||||
to be logged to the same destination configured to receive log output for <application>repmgrd</application>.
|
||||
See <filename>repmgr.conf.sample</filename> for further <application>repmgrd</application>-specific settings.
|
||||
</para>
|
||||
<para>
|
||||
When <varname>failover</varname> is set to <literal>automatic</literal>, upon detecting failure
|
||||
of the current primary, <command>repmgrd</command> will execute one of
|
||||
of the current primary, <application>repmgrd</application> will execute one of
|
||||
<varname>promote_command</varname> or <varname>follow_command</varname>,
|
||||
depending on whether the current server is to become the new primary, or
|
||||
needs to follow another server which has become the new primary. Note that
|
||||
@@ -41,7 +41,7 @@
|
||||
<para>
|
||||
The <varname>follow_command</varname> should provide the <literal>--upstream-node-id=%n</literal>
|
||||
option to <command>repmgr standby follow</command>; the <literal>%n</literal> will be replaced by
|
||||
<command>repmgrd</command> with the ID of the new primary node. If this is not provided, &repmgr;
|
||||
<application>repmgrd</application> with the ID of the new primary node. If this is not provided, &repmgr;
|
||||
will attempt to determine the new primary by itself, but if the
|
||||
original primary comes back online after the new primary is promoted, there is a risk that
|
||||
<command>repmgr standby follow</command> will result in the node continuing to follow
|
||||
@@ -73,7 +73,7 @@
|
||||
<sect1 id="repmgrd-log-rotation">
|
||||
<title>repmgrd log rotation</title>
|
||||
<para>
|
||||
To ensure the current <command>repmgrd</command> logfile does not grow
|
||||
To ensure the current <application>repmgrd</application> logfile does not grow
|
||||
indefinitely, configure your system's <command>logrotate</command> to
|
||||
regularly rotate it.
|
||||
</para>
|
||||
|
||||
@@ -1,9 +1,9 @@
|
||||
<chapter id="repmgrd-degraded-monitoring">
|
||||
<title>"degraded monitoring" mode</title>
|
||||
<para>
|
||||
In certain circumstances, <command>repmgrd</command> is not able to fulfill its primary mission
|
||||
In certain circumstances, <application>repmgrd</application> is not able to fulfill its primary mission
|
||||
of monitoring the nodes' upstream server. In these cases it enters "degraded
|
||||
monitoring" mode, where <command>repmgrd</command> remains active but is waiting for the situation
|
||||
monitoring" mode, where <application>repmgrd</application> remains active but is waiting for the situation
|
||||
to be resolved.
|
||||
</para>
|
||||
<para>
|
||||
@@ -63,7 +63,7 @@
|
||||
<para>
|
||||
By default, <literal>repmgrd</literal> will continue in degraded monitoring mode indefinitely.
|
||||
However a timeout (in seconds) can be set with <varname>degraded_monitoring_timeout</varname>,
|
||||
after which <command>repmgrd</command> will terminate.
|
||||
after which <application>repmgrd</application> will terminate.
|
||||
|
||||
</para>
|
||||
|
||||
|
||||
@@ -13,7 +13,7 @@
|
||||
3 | node3 | standby | running | node1 | default | host=node3 dbname=repmgr user=repmgr</programlisting>
|
||||
</para>
|
||||
<para>
|
||||
Start <command>repmgrd</command> on each standby and verify that it's running by examining the
|
||||
Start <application>repmgrd</application> on each standby and verify that it's running by examining the
|
||||
log output, which at log level <literal>INFO</literal> will look like this:
|
||||
<programlisting>
|
||||
[2017-08-24 17:31:00] [NOTICE] using configuration file "/etc/repmgr.conf"
|
||||
@@ -22,7 +22,7 @@
|
||||
[2017-08-24 17:31:00] [INFO] monitoring connection to upstream node "node1" (node ID: 1)</programlisting>
|
||||
</para>
|
||||
<para>
|
||||
Each <command>repmgrd</command> should also have recorded its successful startup as an event:
|
||||
Each <application>repmgrd</application> should also have recorded its successful startup as an event:
|
||||
<programlisting>
|
||||
$ repmgr -f /etc/repmgr.conf cluster event --event=repmgrd_start
|
||||
Node ID | Name | Event | OK | Timestamp | Details
|
||||
@@ -38,8 +38,8 @@
|
||||
</para>
|
||||
<para>
|
||||
This will force the primary to shut down straight away, aborting all processes
|
||||
and transactions. This will cause a flurry of activity in the <command>repmgrd</command> log
|
||||
files as each <command>repmgrd</command> detects the failure of the primary and a failover
|
||||
and transactions. This will cause a flurry of activity in the <application>repmgrd</application> log
|
||||
files as each <application>repmgrd</application> detects the failure of the primary and a failover
|
||||
decision is made. This is an extract from the log of a standby server (<literal>node2</literal>)
|
||||
which has promoted to new primary after failure of the original primary (<literal>node1</literal>).
|
||||
<programlisting>
|
||||
|
||||
@@ -39,7 +39,7 @@
|
||||
specify how many day's worth of data should be retained.
|
||||
</para>
|
||||
<para>
|
||||
It's possible to use <command>repmgrd</command> to run in monitoring
|
||||
It's possible to use <application>repmgrd</application> to run in monitoring
|
||||
mode only (without automatic failover capability) for some or all
|
||||
nodes by setting <literal>failover=manual</literal> in the node's
|
||||
<filename>repmgr.conf</filename> file. In the event of the node's upstream failing,
|
||||
|
||||
@@ -32,8 +32,8 @@
|
||||
location='dc1'</programlisting>
|
||||
</para>
|
||||
<para>
|
||||
In a failover situation, <command>repmgrd</command> will check if any servers in the
|
||||
same location as the current primary node are visible. If not, <command>repmgrd</command>
|
||||
In a failover situation, <application>repmgrd</application> will check if any servers in the
|
||||
same location as the current primary node are visible. If not, <application>repmgrd</application>
|
||||
will assume a network interruption and not promote any node in any
|
||||
other location (it will however enter <xref linkend="repmgrd-degraded-monitoring"> mode until
|
||||
a primary becomes visible).
|
||||
|
||||
+3
-3
@@ -90,7 +90,7 @@
|
||||
manually with <command>repmgr node check --archive-ready</command>.
|
||||
</para>
|
||||
<para>
|
||||
Ensure that <command>repmgrd</command> is *not* running anywhere to prevent it unintentionally
|
||||
Ensure that <application>repmgrd</application> is *not* running anywhere to prevent it unintentionally
|
||||
promoting a node.
|
||||
</para>
|
||||
<para>
|
||||
@@ -195,9 +195,9 @@
|
||||
</listitem>
|
||||
<listitem>
|
||||
<simpara>
|
||||
<command>repmgrd</command> should not be running with setting <varname>failover=automatic</varname>
|
||||
<application>repmgrd</application> should not be running with setting <varname>failover=automatic</varname>
|
||||
in <filename>repmgr.conf</filename> when a switchover is carried out, otherwise the
|
||||
<command>repmgrd</command> daemon may try and promote a standby by itself.
|
||||
<application>repmgrd</application> daemon may try and promote a standby by itself.
|
||||
</simpara>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
|
||||
@@ -18,9 +18,9 @@
|
||||
<command>ALTER EXTENSION repmgr UPDATE</command>.
|
||||
</para>
|
||||
<para>
|
||||
If <command>repmgrd</command> is running, it may be necessary to restart
|
||||
If <application>repmgrd</application> is running, it may be necessary to restart
|
||||
the PostgreSQL server if the upgrade contains changes to the shared object
|
||||
file used by <command>repmgrd</command>; check the release notes for details.
|
||||
file used by <application>repmgrd</application>; check the release notes for details.
|
||||
</para>
|
||||
|
||||
<sect1 id="upgrading-from-repmgr-3" xreflabel="Upgrading from repmgr 3.x">
|
||||
@@ -83,7 +83,7 @@
|
||||
</listitem>
|
||||
<listitem>
|
||||
<simpara><varname>monitoring_history</varname>: this replaces the
|
||||
<command>repmgrd</command> command line option
|
||||
<application>repmgrd</application> command line option
|
||||
<literal>--monitoring-history</literal></simpara>
|
||||
</listitem>
|
||||
</itemizedlist>
|
||||
@@ -169,7 +169,7 @@
|
||||
<sect2>
|
||||
<title>Upgrading the repmgr schema</title>
|
||||
<para>
|
||||
Ensure <command>repmgrd</command> is not running, or any cron jobs which execute the
|
||||
Ensure <application>repmgrd</application> is not running, or any cron jobs which execute the
|
||||
<command>repmgr</command> binary.
|
||||
</para>
|
||||
<para>
|
||||
@@ -235,7 +235,7 @@
|
||||
</para>
|
||||
<para>
|
||||
Check the data is updated as expected by examining the <structname>repmgr.nodes</structname>
|
||||
table; restart <command>repmgrd</command> if required.
|
||||
table; restart <application>repmgrd</application> if required.
|
||||
</para>
|
||||
<para>
|
||||
The original <literal>repmgr_$cluster</literal> schema can be dropped at any time.
|
||||
|
||||
Reference in New Issue
Block a user