通过nsenter连接docker容器

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通常连接Docker容器并与其进行交互有四种方法。详情见：https://github.com/berresch/Docker-Enter-Demo，下面摘录nsenter连接的方式。

which nsenter

编辑install.sh，复制下文中的脚本，保存，给予执行权限，sh install.sh执行即可

#!/bin/bash
which nsenter &> /dev/null
[ $? -eq 0 ] && exit 1
wget download.cloudcared.cn/software/docker/util-linux-2.24.tar.gz
tar zxf util-linux-2.24.tar.gz
cd util-linux-2.24
./configure --without-ncurses
make nsenter
cp nsenter /usr/local/bin
cd .. && rm -rf util-linux-2.24
cat >> /usr/local/bin/docker-enter <<"EOF"
#!/bin/sh
NSENTER=/usr/local/bin/nsenter

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
EOF
chmod +x /usr/local/bin/docker-enter