查看本机装没有nsenter

whereis nsenter或者whatis nsenter

未安装先安装，网上有很多这样的脚本

vi nsenter.sh
#!/bin/bash
curl http://www.51sjk.com/Upload/Articles/1/0/328/328010_20220921120344328.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

保存退出，执行脚本就可以安装nsenter。如果报错，注意看报错信息，我是安装gcc解决了这个问题，之后运用下面脚本进入容器。

vi docker_enter.sh
#!/bin/sh
# 文 档名: docker_enter.sh
# 版 本: 1.0.1
# 用 途: 使用nsenter工具进入Docker容器
# 用 法：. docker_enter 容器ID或bash -x docker_enter.sh 容器ID
# 正 文：如以下代码

if [ -e $(dirname "$0")/nsenter ]; then
NSENTER=$(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

保存退出，命令行下执行. docker_enter 容器ID或bash -x docker_enter.sh 容器ID，即可成功进入容器