centos Install Docker

1. 安装必备软件

   $ yum -y install iptables  iptables-services net-tools vim wget
   $ wget -P ~ https://github.com/yeasy/docker_practice/raw/master/_local/.bashrc_docker;
   $ echo "[  -f ~/.bashrc_docker  ] && . ~/.bashrc_docker" >> ~/.bashrc; source ~/.bashrc

   
   运行如上命令可使用docker-enter命令进入容器
   下载的脚本代码如下：
   

   # Some useful commands to use docker.
   # Author: yeasy@github
   # Created:2014-09-25
   
   alias docker-pid="sudo docker inspect --format '{{.State.Pid}}'"
   alias docker-ip="sudo docker inspect --format '{{ .NetworkSettings.IPAddress }}'"
   
   #the implementation refs from https://github.com/jpetazzo/nsenter/blob/master/docker-enter
   function docker-enter() {
       #if [ -e $(dirname "$0")/nsenter ]; then
       #Change for centos bash running
       if [ -e $(dirname '$0')/nsenter ]; then
           # with boot2docker, nsenter is not in the PATH but it is in the same folder
           NSENTER=$(dirname "$0")/nsenter
       else
           # if nsenter has already been installed with path notified, here will be clarified
           NSENTER=$(which nsenter)
           #NSENTER=nsenter
       fi
       [ -z "$NSENTER" ] && echo "WARN Cannot find nsenter" && return
   
       if [ -z "$1" ]; then
           echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"
           echo ""
           echo "Enters the Docker CONTAINER and executes the specified COMMAND."
           echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
       else
           PID=$(sudo docker inspect --format "{{.State.Pid}}" "$1")
           if [ -z "$PID" ]; then
               echo "WARN Cannot find the given container"
               return
           fi
           shift
   
           OPTS="--target $PID --mount --uts --ipc --net --pid"
   
           if [ -z "$1" ]; then
               # No command given.
               # Use su to clear all host environment variables except for TERM,
               # initialize the environment variables HOME, SHELL, USER, LOGNAME, PATH,
               # and start a login shell.
               #sudo $NSENTER "$OPTS" su - root
               sudo $NSENTER --target $PID --mount --uts --ipc --net --pid su - root
           else
               # Use env to clear all host environment variables.
               sudo $NSENTER --target $PID --mount --uts --ipc --net --pid env -i $@
           fi
       fi
   }

   docker-enter

   安装后可以使用如下命令
   docker-pid <container> 获取容器的pid
   docker-ip <container> 获取容器的ip
   docker-enter <container>  进入容器
   docker exec -it 92f5506946e7 /bin/bash
   docker-enter <container> ls 在容器中执行命令
   备用地址：wget -p ~ https://github.com/mycheryhr/mycheryhr.github.io/blob/master/.bashrc_docker
   

2. 安装Docker
   yum -y install docker
3. 下载centos镜像
   docker pull centos
4. 查看centos 镜像
   docker images centos
5. 运行一个Docker容器
   docker run -itd centos /bin/bash
   -t 选项让Docker分配一个伪终端（pseudo-tty）并绑定到容器的标准输入上
   -i 则让容器的标准输入保持打开
   -d 让 Docker 容器在后台以守护态（Daemonized）形式运行
   -p 创建端口映射，指定宿主机端口和容器端口，添加映射关系
   -v 挂载一个本地主机目录到容器中 （一次可挂载多个）
6. 搜索Ubuntu镜像
   docker search Ubuntu
7. 显示正在运行的容器（需要先创建容器）
   docker ps
   docker ps –a  显示所有的容器（包括关闭或已经退出的容器）
8. 停止后台运行的容器
   docker stop "容器ID"
9. 删除容器
   docker rm "容器ID"
10. 强制删除一个镜像
    docker rmi -f "镜像ID"

11. 导出和导入容器
    将容器快照导出到本地文件：
    
    将容器快照导入到镜像：
    cat centos.tar | docker import - Test/centos:v1.1
    备注：Test/centos 为Repository仓库  centos:v1.1为Tag
    也可以指定URL导入
    docker import http://example.com/exampleimage.tgz example/imagerepo

12. Docker升级

    yum remove docker \
        docker-client \
        docker-client-latest \
        docker-common \
        docker-latest \
        docker-latest-logrotate \
        docker-logrotate \
        docker-selinux \
        docker-engine-selinux \
        docker-engine
    
    yum remove docker-ce
    
    yum install -y yum-utils \
      device-mapper-persistent-data \
      lvm2
    
    yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
    yum makecache fast
    yum install docker-ce
    
    systemctl start docker