how to check redis instance version?

$ redis-server --version

gives you the version.

Run the command INFO. The version will be the first item displayed.

The advantage of this over redis-server --version is that sometimes you don't have access to the server (e.g. when it's provided to you on the cloud), in which case INFO is your only option.

There are two commands, which you can use to check the version of redis

    redis-server -v

or

    redis-server --version