I have installed redis by following instructions.
$ wget http://download.redis.io/releases/redis-5.0.5.tar.gz
$ tar xzf redis-5.0.5.tar.gz
$ cd redis-5.0.5
$ make
but I don't know how to uninstall now. Please let us share how to completely uninstall redis 5.0.5 from centos 6.10