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Ian Barwick
2015-03-12 10:26:34 +09:00
parent 65afc42afa
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README.md
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@@ -50,7 +50,7 @@ Supported Releases
the same PostgreSQL major version, and preferably should be running the same the same PostgreSQL major version, and preferably should be running the same
minor version. minor version.
PostgreSQL versions 9.0 ~ 9.2 are supporeted by `repmgr` version 2. PostgreSQL versions 9.0 ~ 9.2 are supported by `repmgr` version 2.
Requirements Requirements
------------ ------------
@@ -264,8 +264,6 @@ be queried easily using the view `repl_status`:
apply_lag | 0 bytes apply_lag | 0 bytes
communication_time_lag | 00:00:00.955385 communication_time_lag | 00:00:00.955385
Cascading replication Cascading replication
--------------------- ---------------------
@@ -315,6 +313,8 @@ Further reading:
* http://www.postgresql.org/docs/current/interactive/warm-standby.html#STREAMING-REPLICATION-SLOTS * http://www.postgresql.org/docs/current/interactive/warm-standby.html#STREAMING-REPLICATION-SLOTS
* http://blog.2ndquadrant.com/postgresql-9-4-slots/ * http://blog.2ndquadrant.com/postgresql-9-4-slots/
---------------------------------------
Reference Reference
--------- ---------
@@ -331,22 +331,23 @@ its port if is different from the default one.
* `master register` * `master register`
* Registers a master in a cluster. This command needs to be executed before any Registers a master in a cluster. This command needs to be executed before any
standby nodes are registered. standby nodes are registered.
* `standby register` * `standby register`
* Registers a standby with `repmgr`. This command needs to be executed to enable Registers a standby with `repmgr`. This command needs to be executed to enable
promote/follow operations and to allow `repmgrd` to work with the node. promote/follow operations and to allow `repmgrd` to work with the node.
An existing standby can be registered using this command. An existing standby can be registered using this command.
* `standby clone [node to be cloned]` * `standby clone [node to be cloned]`
* Clones a new standby node from the data directory of the master (or Clones a new standby node from the data directory of the master (or
an upstream cascading standby) using `pg_basebackup` or `rsync`. an upstream cascading standby) using `pg_basebackup` or `rsync`.
Additionally it will create the `recovery.conf` file required to Additionally it will create the `recovery.conf` file required to
start the server as a standby. This command does not require start the server as a standby. This command does not require
`repmgr.conf` to be provided. `repmgr.conf` to be provided, but does require connection details
of the master or upstream server as command line parameters.
Provide the `-D/--data-dir` option to specify the destination data Provide the `-D/--data-dir` option to specify the destination data
directory; if not, the same directory path as on the source server directory; if not, the same directory path as on the source server
@@ -360,10 +361,10 @@ its port if is different from the default one.
* standby promote * standby promote
* Promotes a standby to a master if the current master has failed. It Promotes a standby to a master if the current master has failed. This
requires a valid `repmgr.conf` file for the standby, either specified command requires a valid `repmgr.conf` file for the standby, either
with `-f/--config-file` or located in the current working directory; specified explicitly with `-f/--config-file` or located in the current
no additional arguments are required. working directory; no additional arguments are required.
If the standby promotion succeeds, the server will not need to be If the standby promotion succeeds, the server will not need to be
restarted. However any other standbys will need to follow the new server, restarted. However any other standbys will need to follow the new server,
@@ -374,42 +375,55 @@ its port if is different from the default one.
* standby follow * standby follow
* Allows the standby to base itself to the new primary passed as a Attaches the standby to a new master. This command requires a valid
parameter. This needs to be executed on the same directory where the `repmgr.conf` file for the standby, either specified explicitly with
``repmgr.conf`` is in the standby, or you can use the ``-f`` option `-f/--config-file` or located in the current working directory; no
to indicate where the ``repmgr.conf`` is at. Example: additional arguments are required.
./repmgr standby follow This command will force a restart of the standby server. It can only be used
to attach a standby to a new master node.
* cluster show * cluster show
* Shows the role (standby/master) and connection string for all nodes configured Displays information about each node in the replication cluster. This
in the cluster or "FAILED" if the node doesn't respond. This allow us to know command polls each registered server and shows its role (master / standby /
which nodes are alive and which one needs attention and to have a notion of the witness) or "FAILED" if the node doesn't respond. It polls each server
structure of clusters we just have access to. Example: directly and can be run on any node in the cluster; this is also useful
when analyzing connectivity from a particular node.
This command requires a valid `repmgr.conf` file for the node on which it is
executed, either specified explicitly with `-f/--config-file` or located in
the current working directory; no additional arguments are required.
Example:
repmgr -f /path/to/repmgr.conf cluster show
Role | Connection String
* master | host=node1 dbname=repmgr_db user=repmgr_usr
standby | host=node2 dbname=repmgr_db user=repmgr_usr
standby | host=node3 dbname=repmgr_db user=repmgr_usr
./repmgr cluster show
* cluster cleanup * cluster cleanup
* Cleans the monitor's history from repmgr tables. This avoids the repl_monitor table Purges monitoring history from the `repl_monitor` table to prevent excessive
to grow excesivelly which in turns affects repl_status view performance, also table growth. Use the `-k/--keep-history` to specify the number of days of
keeps controlled the space in disk used by repmgr. This command can be used manually monitoring history to retain. This command can be used manually or as a
or in a cron to make it periodically. cronjob.
There is also a --keep-history (-k) option to indicate how many days of history we
want to keep, so the command will clean up history older than "keep-history" days. Example::
./repmgr cluster cleanup -k 2 This command requires a valid `repmgr.conf` file for the node on which it is
executed, either specified explicitly with `-f/--config-file` or located in
the current working directory; no additional arguments are required.
### repmgr configuration file ### repmgr configuration file
See `repmgr.conf.sample` for an example configuratio file with available See `repmgr.conf.sample` for an example configuration file with available
configuration settings annotated. configuration settings annotated.
### repmgr database schema ### repmgr database schema
`repmgr` creates a small schema for its own use in the database specified in `repmgr` creates a small schema for its own use in the database specified in
each node's conninfo configuration parameter. This database can in principle each node's `conninfo` configuration parameter. This database can in principle
be any database. The schema name is the global `cluster` name prefixed be any database. The schema name is the global `cluster` name prefixed
with `repmgr_`, so for the example setup above the schema name is with `repmgr_`, so for the example setup above the schema name is
`repmgr_test`. `repmgr_test`.
@@ -419,10 +433,13 @@ The schema contains two tables:
* `repl_nodes` * `repl_nodes`
stores information about all registered servers in the cluster stores information about all registered servers in the cluster
* `repl_monitor` * `repl_monitor`
stores monitoring information about each node (generated by `repmgrd` stores monitoring information about each node (generated by `repmgrd` with
`-m/--monitoring-history` option enabled)
and one view, `repl_status`, which summarizes the latest monitoring information and one view:
for each node. * `repl_status`
summarizes the latest monitoring information for each node (generated by `repmgrd` with
`-m/--monitoring-history` option enabled)
### Error codes ### Error codes
@@ -449,12 +466,14 @@ Support and Assistance
2ndQuadrant provides 24x7 production support for repmgr, including 2ndQuadrant provides 24x7 production support for repmgr, including
configuration assistance, installation verification and training for configuration assistance, installation verification and training for
running a robust replication cluster. running a robust replication cluster. For further details see:
* http://2ndquadrant.com/en/support/
There is a mailing list/forum to discuss contributions or issues There is a mailing list/forum to discuss contributions or issues
http://groups.google.com/group/repmgr http://groups.google.com/group/repmgr
#repmgr is registered in freenode IRC The IRC channel #repmgr is registered with freenode.
Further information is available at http://www.repmgr.org/ Further information is available at http://www.repmgr.org/
@@ -462,21 +481,21 @@ We'd love to hear from you about how you use repmgr. Case studies and
news are always welcome. Send us an email at info@2ndQuadrant.com, or news are always welcome. Send us an email at info@2ndQuadrant.com, or
send a postcard to send a postcard to
repmgr repmgr
c/o 2ndQuadrant c/o 2ndQuadrant
7200 The Quorum 7200 The Quorum
Oxford Business Park North Oxford Business Park North
Oxford Oxford
OX4 2JZ OX4 2JZ
United Kingdom United Kingdom
Thanks from the repmgr core team. Thanks from the repmgr core team.
Ian Barwick * Ian Barwick
Jaime Casanova * Jaime Casanova
Abhijit Menon-Sen * Abhijit Menon-Sen
Simon Riggs * Simon Riggs
Cedric Villemain * Cedric Villemain

2
repmgr.c
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@@ -593,7 +593,7 @@ do_cluster_show(void)
} }
PQfinish(conn); PQfinish(conn);
printf("Role | Connection String \n"); printf("Role | Connection String\n");
for (i = 0; i < PQntuples(res); i++) for (i = 0; i < PQntuples(res); i++)
{ {
conn = establish_db_connection(PQgetvalue(res, i, 0), false); conn = establish_db_connection(PQgetvalue(res, i, 0), false);