To install Redis on CentOS, run
yum install redis
Start redis with
service redis start
Set redis to start on boot
systemctl enable redis
Verify redis is running with
[root@vps154294 ~]# netstat -antp | grep redis tcp 0 0 127.0.0.1:6379 0.0.0.0:* LISTEN 32367/redis-server [root@vps154294 ~]#