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Redis service crashed

Last update: Thu Jul 27 2023 00:00:00 GMT+0000 (Coordinated Universal Time)
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The article recommends how to fix Redis.

Affected products and versions

  • Adobe Commerce on cloud infrastructure 2.2.x., 2.3.x
  • Adobe Commerce on-premises 2.2.x., 2.3x
  • All versions of Redis

Issue

Website slowness or outage due to memory overflow in Redis.

Cause

Memory overflow can cause the Redis service to crash. During peak time, the Redis service may require more memory than what is currently allocated.

Solution

To check current configuration and used memory, run the following command in the CLI. It checks for used memory, maxmemory, evicted keys, and Redis up time in days:

redis-cli -p REDIS_PORT -h REDIS_HOST info | egrep --color "(role|used_memory_peak|maxmemory|evicted_keys|uptime_in_days)"

The REDIS_PORT and REDIS_HOST variables can be retrieved from app/etc/env.php.

If the output from running the above query shows that the percentage of free memory is less than 40%, submit a ticket to Adobe Commerce support requesting an increase of the maxmemory setting in Redis Server. If the evicted keys value is not “0” or the Redis up time in days equals 0 (indicating Redis has crashed today), you should also submit a ticket to Adobe Commerce support requesting an investigation and a fix for this issue.

To learn more about Redis memory refer to Redis Memory Optimization.

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