nsenter鏈接正在運行的docker容器

一般鏈接Docker容器並與其進行交互有四種方法。

詳情見：https://github.com/berresch/Docker-Enter-Demo，下面摘錄nsenter鏈接的方式。

1、查看是否安裝nsenter

[root@localhost ~]# whereis nsenter
nsenter: /usr/bin/nsenter /usr/share/man/man1/nsenter.1.gz

    我用的centos7.4 64位服務器，默認已安裝，若是沒安裝可建立install.sh，並執行

#!/bin/bash

curl https://www.kernel.org/pub/linux/utils/util-linux/v2.24/util-linux-2.24.tar.gz | tar -zxf-
cd util-linux-2.24
./configure --without-ncurses
make nsenter
sudo cp nsenter /usr/local/bin
cd .. && rm -rf util-linux-2.24

    一、建立docker-enter並置於$PATH下

#!/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" $OPTS su - root
"$NSENTER" $OPTS /bin/su - root
  else
    # Use env to clear all host environment variables.
    "$NSENTER" $OPTS env --ignore-environment -- "$@"
  fi
fi

    二、放在.bashrc中，就能夠方便的使用了。（運行source ./bashrc不重啓生效）

#docker
#export DOCKER_HOST=tcp://localhost:4243
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 "$0")/nsenter ]; then
                # with boot2docker, nsenter is not in the PATH but it is in the same folder
        NSENTER=$(dirname "$0")/nsenter
    else
        NSENTER=nsenter
    fi
    [ -z "$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
}

    執行：

source ./bashrc

    讓修改生效，進入容器：

docker-enter container_NAME_OR_ID