进入docker容器之nsenter脚本

mindong

　　docker-enter脚本内容如下：
root@zxl-node4:~# cat docker-enter
#!/bin/sh
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
    NSENTER=nsenter
fi
if [ -z "$1" ]; then
    echo "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...]"
    echo ""
    echo "Enters the Docker CONTAINER and executes the specified COMMAND."
    echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
else
    PID=$(docker inspect --format "``.`State`.`Pid`" "$1")
    if [ -z "$PID" ]; then
        exit 1
    fi
    shift
    OPTS="--target $PID --mount --uts --ipc --net --pid --"
    if [ -z "$1" ]; then
        # No command given.
        # Use su to clear all host environment variables except for TERM,
        # initialize the environment variables HOME, SHELL, USER, LOGNAME, PATH,
        # and start a login shell.
        "$NSENTER" $OPTS su - root
    else
       # Use env to clear all host environment variables.
       "$NSENTER" $OPTS env --ignore-environment -- "$@"
    fi
fi　　

　　赋予docker-enter执行权限
root@zxl-node4:~# chmod +x docker-enter
使用docker-enter进入容器，实例如下：
查看一下运行的容器
root@zxl-node4:~# docker ps -a
CONTAINER ID        IMAGE                       COMMAND             CREATED             STATUS              PORTS               NAMES
7237c3c12e68        jdeathe/centos-ssh:latest   "/bin/bash"         5 hours ago         Up 5 hours          22/tcp              node5               
571c7712daec        jdeathe/centos-ssh:latest   "/bin/bash"         5 hours ago         Up 5 hours          22/tcp              node4               
0d935fcad74b        jdeathe/centos-ssh:latest   "/bin/bash"         5 hours ago         Up 5 hours          22/tcp              node2               
c1e5cca51f2e        jdeathe/centos-ssh:latest   "/bin/bash"         23 hours ago        Up 23 hours         22/tcp              mysql　　

　　使用docker-enter进入容器node4
root@zxl-node4:~# ./docker-enter node4
[root@571c7712daec ~]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
28: eth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
    link/ether 02:42:ac:11:00:0d brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.13/16 scope global eth0
       valid_lft forever preferred_lft forever
    inet6 fe80::42:acff:fe11:d/64 scope link
       valid_lft forever preferred_lft forever
[root@571c7712daec ~]# hostname
571c7712daec
[root@571c7712daec ~]#　　

　　以上就是使用docker-enter进入容器！！！