Redis 4.x Cookbook

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"
used_memory_human:1016.45M
maxmemory_human:1.00G  

2. Test regularly to see if it's working properly by writing a simple key value pair into the Redis instance:

127.0.0.1:6379> SET foo bar
(error) OOM command not allowed when used memory > 'maxmemory'.  

3. Take a note of when the metric evicted_keys has increased:

$ bin/redis-cli INFO Stats|grep evicted_keys
evicted_keys:382901 

4. Next, check the system memory and swap space utilization of the redis-server process:

$ bin/redis-cli INFO ...