1.解决docker pull很慢的问题，这里使用阿里云的镜像
[root@localhost ~]# mkdir -p /etc/docker
[root@localhost ~]# tee /etc/docker/daemon.json <<-'EOF'
{ "registry-mirrors": ["https://9cpn8tt6.mirror.aliyuncs.com"]
}
EOF
[root@localhost ~]# systemctl daemon-reload
[root@localhost ~]# systemctl restart docker
2.一次性删除所有的docker容器名称
docker ps -a | grep"Exited"| awk'{print $1 }'|xargs docker stop
docker ps -a | grep"Exited"| awk'{print $1 }'|xargs docker rm
docker images|grep none|awk'{print $3 }'|xargs docker rmi
