Rails, Redis and Sentinel
I have a Redis cluster of 4 nodes, 1 master and 3 slaves, controlled by Sentinel.
Now in rails, I need to connect to this cluster, reading from the nearest replica and writing to master, just like with MongoDB.
Using a stone redis-rails
, how can one be configured cache_store
to point Guardians instead of a single node?
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1 answer
I may have missed it, but I didn't know that you can configure it to read from subordinates? However, this is my master + 2 slave config:
config.cache_store = :redis_store, {
url: 'redis://prestwick/1',
sentinels: [{host: 'prestwick.i', port: 26379}, {host: 'carnoustie.i', port: 26379}, {host: 'birkdale.i', port: 26379}],
role: 'master',
expires_in: 1.hour
}
And in case it's helpful, my config for the REDIS and Sidekiq shared object (this is in config / initializers / 001_redis.rb):
redis_options = {
url: 'redis://prestwick/0',
sentinels: [{host: 'prestwick.i', port: 26379}, {host: 'carnoustie.i', port: 26379}, {host: 'birkdale.i', port: 26379}],
role: 'master'
}
redis_sidekiq_options = {
url: 'redis://prestwick/2',
sentinels: [{host: 'prestwick.i', port: 26379}, {host: 'carnoustie.i', port: 26379}, {host: 'birkdale.i', port: 26379}],
role: 'master'
}
REDIS = Redis.new(redis_options)
Sidekiq.configure_server do |config|
config.redis = redis_sidekiq_options
end
Sidekiq.configure_client do |config|
config.redis = redis_sidekiq_options
end
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