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Mat
Asked: 2015-04-30 23:21:46 +0800 CST

Redis high availability and load balancing

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I'm using Redis for some time and now we want to move to a redundant cluster which would be fault tolerant, highly available and load balanced.

I principally use Redis for some PHP web application which stores some process status information (I'm using PHPRedis for this) and I would like to use it also for PHP session store in a load balanced cluster.

I already have a Load Balancing that I use for Nginx and MySQL (based on pfSense).

I saw that Redis Cluster exists for Redis 3, but I also read some comments about the fact that it is not ready for production, others that tells that Redis cannot do a complete master/master cluster configuration.

What is your advise?

  • Try Redis Cluster
  • Move to another key=value engine (CouchDB? Memcached? Others?)
  • Don't mind about load balancing and use only one node of the cluster per time, and having a manual failover, as I don't use persistence
  • Other ideas?

Thank you very much for your help!

load-balancing

2 Answers

  1. Best Answer

    Redis Sentinel will allow you to run multiple instances of redis and handles failover for you. http://redis.io/topics/sentinel

    • 5

  2. An obvious solution to loadbalance redis is to use sentinel.

    As far as I can see predis does not support sentinel as of now. See:

    https://github.com/nrk/predis/issues/131

    A possible solution can be Redis sentinel + HAProxy failover if you want to keep using predis.

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