centos Install Docker

$ 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:2014-09-25alias 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

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

yum remove docker \
    docker-client \
    docker-client-latest \
    docker-common \
    docker-latest \
    docker-latest-logrotate \
    docker-logrotate \
    docker-selinux \
    docker-engine-selinux \
    docker-engineyum remove docker-ceyum install -y yum-utils \
  device-mapper-persistent-data \
  lvm2yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
yum makecache fast
yum install docker-cesystemctl start docker