使用nsenter进入docker container

 最近一直搞docker,老是用exec进入docker容器也很麻烦,今天在网上发现了nsenter进入容器很方便,解放了老是使用命令进入docker容器的麻烦,下面来看看nsenter的安装和使用吧.

  系统:centos 6.x(64位)

  环境:docker 1.7.1

1.安装nsenter

wget

tar zxf util-linux-2.24.tar.gz && cd util-linux-2.24

./configure --without-python --disable-all-programs --enable-nsenter --without-ncurses

make nsenter

cp nsenter /usr/local/bin

2.使用nsenter

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