root $ 
root $ docker images redis
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
redis               alpine              bd71e6db4a54        2 weeks ago         32.2MB
redis               latest              84c5f6e03bf0        2 weeks ago         104MB
root $ 
root $ docker run --name rd -d -p 99:99 redis:latest
ac4b8b2b032b2c2911f03fd4f6af649f470620cd29eb566b821e5ce738d9ac11
root $ 
root $ docker exec -ti --user root rd bash
root@ac4b8b2b032b:/data# 
root@ac4b8b2b032b:/data# redis-cli
127.0.0.1:6379> 
127.0.0.1:6379> exit
root@ac4b8b2b032b:/data# 
root@ac4b8b2b032b:/data# exit
exit
root $