[root@localhost ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

pujh/centos         tomcat-centos       70ff7873d7cd        About an hour ago    MB

docker.io/centos    latest              9f38484d220f         days ago          MB

[root@localhost ~]# docker tag 70ff7873d7cd my_centos:tomcat-centos

[root@localhost ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

my_centos           tomcat-centos       70ff7873d7cd        About an hour ago   612 MB

pujh/centos         tomcat-centos       70ff7873d7cd        About an hour ago    MB

docker.io/centos    latest              9f38484d220f         days ago          MB

[root@localhost ~]# docker rmi 70ff7873d7cd

Error response from daemon: conflict: unable to delete 70ff7873d7cd (cannot be forced) - image is being used by running container 70859e710147

[root@localhost ~]# docker ps -a

CONTAINER ID        IMAGE               COMMAND                  CREATED             STATUS                      PORTS                    NAMES

70859e710147        70ff                "/bin/sh -c '/root..."   About an hour ago   Up About an hour            0.0.0.0:->/tcp   dazzling_hopper

[root@localhost ~]# docker stop 70859e710147 

[root@localhost ~]# docker rm 70859e710147 

[root@localhost ~]# docker rmi 70ff7873d7cd

[root@localhost ~]# docker images

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

my_centos           tomcat-centos       70ff7873d7cd        About an hour ago   612 MB

docker.io/centos    latest              9f38484d220f        11 days ago         202 MB