The 'pm2 redis module error' is typically caused by one of two main issues. First, the Redis server might not be running or improperly configured, causing the PM2 process manager to be unable to connect and manage the Redis instance correctly. Second, there could be a problem with the PM2 configuration itself, such as incorrect environment variables, missing dependencies, or an outdated version of PM2. In both cases, the error arises when there's a miscommunication or misconfiguration between PM2 and Redis.
To resolve the 'pm2 redis module error', follow these steps:
Verify that your Redis server is running, listening on the correct IP address and port, and has the proper authentication settings in place. You can use
redis-cli ping to check if the server is responding, and review the Redis configuration file (usually redis.conf) for any discrepancies.
Double-check your PM2 configuration to ensure it contains the correct environment variables and settings for connecting to the Redis server. This includes verifying the IP address, port, and auth credentials. Make sure you have the appropriate Redis client library installed for your application.
Update your PM2 version to the latest one, as older versions may have compatibility issues with Redis. You can update PM2 using the command
npm install pm2@latest -g.
If you're still encountering issues, inspect the logs for both PM2 and Redis for any additional details that might help pinpoint the source of the issue. Use
pm2 logs to view PM2 logs and check the log output within the Redis configuration file for the Redis logs.
By addressing the possible causes mentioned above, you should be able to resolve the 'pm2 redis module error'.