Error: redis.exceptions.connectionerror: connection closed by server.

What's Causing This Error

The error message 'redis.exceptions.connectionerror: connection closed by server' indicates that Redis was unable to establish a connection with the server or that the connection was abruptly terminated. There could be several reasons for this error, including network-related issues, server unavailability, high load on the server, or a misconfiguration of Redis itself.

One possible reason for this error is a failure to configure Redis to handle the number of connections being requested. By default, Redis allows only 10,000 simultaneous connections. If your application creates more connections than this limit, Redis will close the connections one by one, leading to this error.

Solution - Here's How To Resolve It

To resolve the error 'redis.exceptions.connectionerror: connection closed by server,' you can try one or more of the following solutions:

1. Check if the Redis server is running and accepting connections. You can do this by running the command redis-cli ping in a terminal. If the server is not responding, make sure it is running and try reconnecting.

2. Increase the maximum number of allowed connections in Redis. This can be done by modifying the maxclients parameter in the Redis configuration file (redis.conf) or by running the command CONFIG SET maxclients <number> in a Redis client.

3. Reduce the number of connections made by your application. This can be achieved by implementing connection pooling or by optimizing your code to reuse existing connections instead of creating new ones.

4. Make sure that there are no network-related issues preventing your application from connecting to Redis. Check firewall settings, DNS resolution, and network bandwidth to ensure they are not causing the issue.

By following these solutions, you should be able to resolve the 'redis.exceptions.connectionerror: connection closed by server' error and improve the stability of your Redis application.