2016-11-03 12:29:30 +05:30
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# Cleaning up stale Redis sessions
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Since version 6.2, GitLab stores web user sessions as key-value pairs in Redis.
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Prior to GitLab 7.3, user sessions did not automatically expire from Redis. If
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you have been running a large GitLab server (thousands of users) since before
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GitLab 7.3 we recommend cleaning up stale sessions to compact the Redis
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database after you upgrade to GitLab 7.3. You can also perform a cleanup while
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still running GitLab 7.2 or older, but in that case new stale sessions will
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start building up again after you clean up.
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In GitLab versions prior to 7.3.0, the session keys in Redis are 16-byte
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hexadecimal values such as '976aa289e2189b17d7ef525a6702ace9'. Starting with
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GitLab 7.3.0, the keys are
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prefixed with 'session:gitlab:', so they would look like
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'session:gitlab:976aa289e2189b17d7ef525a6702ace9'. Below we describe how to
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remove the keys in the old format.
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2017-09-10 17:25:29 +05:30
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**Note:** the instructions below must be modified in accordance with your
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configuration settings if you have used the advanced Redis
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settings outlined in
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[Configuration Files Documentation](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/config/README.md).
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2019-05-30 16:15:17 +05:30
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2016-11-03 12:29:30 +05:30
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First we define a shell function with the proper Redis connection details.
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```
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rcli() {
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# This example works for Omnibus installations of GitLab 7.3 or newer. For an
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# installation from source you will have to change the socket path and the
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# path to redis-cli.
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sudo /opt/gitlab/embedded/bin/redis-cli -s /var/opt/gitlab/redis/redis.socket "$@"
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}
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# test the new shell function; the response should be PONG
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rcli ping
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```
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Now we do a search to see if there are any session keys in the old format for
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us to clean up.
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```
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# returns the number of old-format session keys in Redis
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rcli keys '*' | grep '^[a-f0-9]\{32\}$' | wc -l
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```
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If the number is larger than zero, you can proceed to expire the keys from
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Redis. If the number is zero there is nothing to clean up.
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```
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# Tell Redis to expire each matched key after 600 seconds.
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rcli keys '*' | grep '^[a-f0-9]\{32\}$' | awk '{ print "expire", $0, 600 }' | rcli
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# This will print '(integer) 1' for each key that gets expired.
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```
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Over the next 15 minutes (10 minutes expiry time plus 5 minutes Redis
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background save interval) your Redis database will be compacted. If you are
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still using GitLab 7.2, users who are not clicking around in GitLab during the
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10 minute expiry window will be signed out of GitLab.
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