Support connecting to Redis Sentinel
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Needed for Redis HA on gitlab.com gitlab-com/operations#5 (closed).
Means adding sentinel config in config.yml: list of sentinels, master name. And when sentinel is enabled, before connecting to redis, first run redis-cli SENTINEL get-master-addr-by-name mymaster to get the address of the current master.
Since we now have redis-rb library vendorized, we can rely on it to discover / handle sentinel connection itself.
Related to: https://gitlab.com/gitlab-org/gitlab-ce/issues/3355
Following gitlab's resque.yml syntax, for config.yml we are going to add a sentinelskey in redis:
# Redis settings used for pushing commit notices to gitlab
redis:
bin: /usr/bin/redis-cli
# host: 127.0.0.1
# port: 6379
# pass: redispass # Allows you to specify the password for Redis
database: 0
socket: /var/run/redis/redis.sock # Comment out this line if you want to use TCP or Sentinels
namespace: resque:gitlab
sentinels:
-
host: localhost
port: 26380 # point to sentinel, not to redis port
-
host: slave2
port: 26381 # point to sentinel, not to redis port
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