Error: redis connection error 111

Detailed Solution for "Redis Connection Error 111"

1. Ensure Redis Server Is Running: Check whether the Redis server is up and running.

   • Linux: Run systemctl status redis or service redis status.
   • Docker: If using Docker, ensure your container is running with docker ps.
   • Command Line: Use redis-cli ping. A "PONG" response indicates the server is running.

2. Check Network Connections: Diagnose your network for any issues.

   • Local Network: Try ping <redis-server-ip> and ensure there's no packet loss.
   • Cross-Network: If accessing across networks, verify your routing paths and consider tools like traceroute or mtr.
   • Docker Networking: For Docker setups, ensure proper network bridge configuration with docker network inspect <network>.

3. Verify Host and Port: Confirm that you're using the correct host and port number.

   • Configuration File: Look at your redis.conf for the bind directive and port setting.
   • Client Settings: Ensure your application client library matches these details.
   • Environment Variables: Double-check any environment variables overriding defaults.

4. Review Firewall Settings: Check your firewall settings.

   • iptables: List rules with sudo iptables -L | grep 6379. Add rules if needed: sudo iptables -A INPUT -p tcp --dport 6379 -j ACCEPT.
   • UFW: If using UFW, allow the port with sudo ufw allow 6379/tcp.
   • Cloud Providers: Adjust security groups or firewall settings in AWS, Azure, GCP, etc., to permit traffic on port 6379.

By following these detailed steps tailored to various environments and situations, you should be able to diagnose and resolve the 'redis connection error 111'.