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Redis: Difference between revisions
imported>Krinkle (→See also: wmf-config/redis.php references nutcracker sockets) |
imported>BryanDavis (Link to better mw-vagrant labs page) |
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Check puppet and {{config file|ProductionServices.php}} for <code>jobqueue_aggregator</code> to see where it runs (as of August 2016 the servers are rdb1001, rdb1003, rdb1005 and rdb1007). | Check puppet and {{config file|ProductionServices.php}} for <code>jobqueue_aggregator</code> to see where it runs (as of August 2016 the servers are rdb1001, rdb1003, rdb1005 and rdb1007). | ||
[[mw:MediaWiki-Vagrant|MediaWiki-Vagrant]] and [[Labs- | [[mw:MediaWiki-Vagrant|MediaWiki-Vagrant]] and [[Help:MediaWiki-Vagrant in Labs|MediaWiki-Vagrant in Labs]] are configured by default to use redis for [[mw:Manual:$wgMainCacheType|$wgMainCacheType]], [[mw:Manual:$wgMainCacheType$wgSessionCacheType|$wgSessionCacheType]], etc. | ||
== Usage == | == Usage == | ||
Revision as of 03:05, 9 May 2017
- See also Nova Resource:Tools/Redis for the tool labs service.
Redis cache is used in production for caching of
- the MediaWiki job queue
- user sessions
- lists of log messages that are processed by logstash
Check puppet and ProductionServices.php for jobqueue_aggregator to see where it runs (as of August 2016 the servers are rdb1001, rdb1003, rdb1005 and rdb1007).
MediaWiki-Vagrant and MediaWiki-Vagrant in Labs are configured by default to use redis for $wgMainCacheType, $wgSessionCacheType, etc.
Usage
Connecting
You can use the redis-cli utility to make queries against redis. In order to make queries against redis, you need to be on a production server such as tin that can access the servers, and give the command
- redis-cli -a password-here -h rdb1001
(Grab the password out of /srv/mediawiki/wmf-config/PrivateSettings.php on tin, the server where it runs, look for $wmgRedisPassword in it.)
This will leave you at a redis prompt where you can enter commands interactively.
Some useful commands
info will give you a pile of status information about the server, including the number of keys near the end of the output.
keys pattern-here will give you a list of all keys matching the given pattern. Use this sparingly, there's a lot of keys in there and the query will take (at least) several seconds to complete.
quit closes the connection.
Other references
Commands are easy, they all depend on the data type (hash, set, list, etc). Here's a quick reference.
Configuration is likewise pretty straightforward with perhaps the exception of the snapshotting, aof and memory settings; here's the sample config file.
See also
- memcached
- nutcracker (AKA twemproxy), the proxy used by all application servers to contact memcached (but not redis as of 2015, except it does again as of 2016)