Question: How can one execute Redis replication related code?

Answer

In Redis, the process of replication is started by calling the SLAVEOF command. Here's an example of how this might work.

Let's assume we have two Redis instances running on ports 6379 (master) and 6380 (slave).

On the slave instance of Redis server (6380), you'd run:

redis-cli -p 6380
127.0.0.1:6380> SLAVEOF localhost 6379

This will start the replication process, making the instance operating on port 6380 a slave of the instance operating on port 6379.

If you want to stop the replication process, you can use the same SLAVEOF command but with "no one" parameters.

127.0.0.1:6380> SLAVEOF no one

You can also check the status of replication by using the INFO command as follows:

127.0.0.1:6380> INFO replication

The output will provide detailed information about the replication status. This includes things like whether the instance is a master or slave, the number of connected slaves if it's a master, and the master's IP and port number if it's a slave.

Note that for Redis versions 5.0 and above, the terms "master" and "slave" have been replaced with "primary" and "replica".

It's worth noting that the execution of any code in relation to Redis is not limited to just initiating and monitoring the replication process. Depending on your use-case and requirements, you might want to programmatically manage replication using various client libraries available for languages like Python, Node.js, Java, and many others.