How to do it...

You should make sure you are able to get alerted when the memory issues happen:

  1. Firstly, watch out if the used_memory_human metric is greater than the metric maxmemory_human:
$ bin/redis-cli INFO MEMORY|egrep "used_memory_human|maxmemory_human"
  1. Test regularly to see if it's working properly by writing a simple key value pair into the Redis instance:> SET foo bar
(error) OOM command not allowed when used memory > 'maxmemory'.  
  1. Take a note of when the metric evicted_keys has increased:
$ bin/redis-cli INFO Stats|grep evicted_keys
  1. Next, check the system memory and swap space utilization of the redis-server process:
$ bin/redis-cli INFO ...

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