yum install -y docker

yum list installed | grep docker

yum remove -y docker.x86_64
yum remove -y docker-client.x86_64
yum remove -y docker-common.x86_64

systemctl start docker 或者 systemctl start docker.service

systemctl status docker

systemctl stop docker

systemctl restart docker

docker pull tomcat:7.0.77-jre7

vi /etc/docker/daemon.json

{"registry-mirrors": ["https://docker.mirrors.ustc.edu.cn"] }

systemctl restart docker

docker images

docker rmi docker.io/tomcat:7.0.77-jre7 或者 docker rmi b39c68b7af30
docker.io/tomcat：镜像名称，拉去官网的镜像名称前都带docker.io/前缀 b39c68b7af30：镜像ID，根据自己实际的替换

docker save docker.io/tomcat:7.0.77-jre7 >/root/mytomcat7.tar.gz

docker load < /root/mytomcat7.tar.gz

docker ps -a

docker ps

docker run -it --name mytomcat1 docker.io/tomcat:7.0.77-jre7 /bin/bash
mytomcat1 ：表示启动容器时给起的别名
docker.io/tomcat:7.0.77-jre7：表示你要启动哪个镜像的容器实例
/bin/bash：表示启动以后用命令进行交互

docker run -d --name mytomcat2 docker.io/tomcat:7.0.77-jre7

docker exec -it mytomcat2 /bin/bash

docker stop mytomcat2 或者 docker stop 3c28f94c533f
3c28f94c533f：表示容器ID（CONTAINER ID）

docker start mytomcat2 或者 docker start 3c28f94c533f

docker rm mytomcat2 或者 docker rm 3c28f94c533f

docker rm `docker ps -a -q`