Error: could not connect to redis at 127.0.0.1:6379: connection refused

Solution

Understanding the "could not connect to redis at 127.0.0.1:6379: connection refused" error

This error occurs when your application fails to establish a connection with Redis at the default localhost address and port. It usually indicates that the Redis server is not running or is inaccessible.

Root Causes

1. Redis server is not running
2. Redis is running on a different port
3. Firewall blocking the connection
4. Redis configured to listen on a different interface

Solution - How to Resolve It

Follow these steps to resolve the Redis connection error:

1. Check if Redis is running:
   CODE_BLOCK_PLACEHOLDER_0

If it's not running, start it:
CODE_BLOCK_PLACEHOLDER_1

2. Verify Redis is listening on the correct port:
   CODE_BLOCK_PLACEHOLDER_2

You should see an entry for 127.0.0.1:6379

3. Check Redis configuration:
   Open the Redis configuration file:
   CODE_BLOCK_PLACEHOLDER_3

Ensure these lines are present and uncommented:
```
bind 127.0.0.1
port 6379
```

4. Test Redis connection:
   CODE_BLOCK_PLACEHOLDER_5

If it returns "PONG", Redis is running and accessible

5. Check firewall settings:
   If using UFW:
   CODE_BLOCK_PLACEHOLDER_6

If it's active, allow Redis:
CODE_BLOCK_PLACEHOLDER_7

6. Restart Redis after changes:
   CODE_BLOCK_PLACEHOLDER_8
7. Verify in your application code:
   Ensure you're using the correct host and port in your Redis connection string:
   ```
   redis://127.0.0.1:6379
   ```

Prevention

• Regularly monitor Redis status with system monitoring tools
• Set up automatic Redis startup on system boot:
  CODE_BLOCK_PLACEHOLDER_10
• Keep Redis updated to the latest stable version

If the problem persists after these steps, check Redis logs for more detailed error information:
CODE_BLOCK_PLACEHOLDER_11