OOM command not allowed when used memory > 'maxmemory'.
WordPress is unable to establish a connection to Redis. This means that the connection information in your wp-config.php file are incorrect, or that the Redis server is not reachable.
wp-config.php
If you need help, please read the installation instructions.
To disable Redis, delete the object-cache.php file in the /wp-content/ directory.
object-cache.php
/wp-content/