Question: How to stop Redis server?

Answer

To stop the Redis server, you can use the SHUTDOWN command which gracefully shuts down the server. There are two ways to issue this command:

1. Using the redis-cli command-line tool:
   ```
   redis-cli SHUTDOWN
   ```
2. Sending a signal to the Redis process using the kill command:
   ```
   kill <pid>
   ```
   Replace <pid> with the process ID of the Redis server. You can find the process ID by running the following command:
   ```
   ps aux | grep redis-server
   ```

Note that sending a SIGTERM signal (default when using kill) to Redis is equivalent to issuing a SHUTDOWN SAVE command, which saves the data to disk before shutting down. If you want to shut down Redis without saving the data to disk, you can send a SIGINT signal instead:
```
kill -2 <pid>
```

It's generally recommended to use the SHUTDOWN command to ensure that Redis shuts down gracefully and all data is saved properly.