利用nsenter从宿主机快速进入Docker容器
在大多数Linux发行版中，util-linux包中含有nsenter.如果没有，你需要安装它.
wget https://www.kernel.org/pub/linux/utils/util-linux/v2.24/util-linux-2.24.tar.gz tar -zxvf util-linux-2.24.tar.gzcd util-linux-2.24./configure --without-ncurses make nsenter cp nsenter /usr/local/bin使用shell脚本 docker-enter，将如下代码保存为docker-enter, chomod +x 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
注意：若直接使用root用户则把脚本中su root 去掉即可，已标注：
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