The 'redis cache not working' error can occur due to various reasons. Firstly, the Redis server could be down or unreachable, causing the caching service to lose connection. Secondly, incorrect configuration settings - like an invalid server address or port number - can also cause the error. Moreover, exceeding the memory usage limit of the Redis instance can result in this error.
There may also be network issues or firewall restrictions blocking the connection between the caching service and the Redis server. Finally, coding errors such as syntax mistakes or invalid commands can also trigger the error.
To resolve the 'redis cache not working' error, follow these steps. Firstly, make sure the Redis server is operational and accessible to the caching service by checking its status using Redis CLI or other monitoring tools.
Secondly, verify that the caching system is correctly configured, including the server address, port number, and authentication credentials if necessary. Correct any misconfigurations found.
Thirdly, check whether the Redis instance has reached its maximum memory usage limit. You can either increase the memory limit or free up space by deleting unnecessary data.
Additionally, check for network issues or firewall restrictions that may be preventing the connection between the caching service and the Redis server. You may need to adjust your network settings or firewall rules accordingly.
Lastly, review the code implementing the caching solution for any syntax errors or invalid commands. Fix any issues discovered and test the caching solution again to ensure it is functioning correctly.