How to use the nsenter command to enter the Docker container
This article mainly explains "how to use ncenter command to enter Docker container", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let Xiaobian take you to learn "how to use the nsenter command to enter the Docker container"!
The nsenter command is a command that runs a specified program in the command space of a specified process. One of the most typical uses is to enter the container's network command space.
Check that there is no nsenter installed.
whereis ncenter or whatis ncenter
Install before installing. There are many such scripts on the Internet.
vi nsenter.sh#!/ bin/bashcurl 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-ncursesmake nsentersudo cp nsenter /usr/local/bincd .. && rm -rf util-linux-2.24 Save exit, execute script to install ncenter. If the error, pay attention to read the error message, I installed gcc to solve this problem, and then use the following script to enter the container. vi docker_enter.sh#!/ bin/sh#File name: docker_enter.sh#Version: 1.0.1#Usage: Use nsenter tool to enter Docker container #Usage: . docker_enter Container ID or bash -x docker_enter.sh Container ID#Text: such as the following code if [ -e $(dirname "$0")/nsenter ]; thenNSENTER=$(dirname "$0")/nsenterseSENTER =nsenterfiif [ -z "$1" ]; thenecho "Usage: `basename "$0"` CONTAINER [COMMAND [ARG]...] "echo ""echo "Enters the Docker CONTAINER and executes the specified COMMAND. "echo "If COMMAND is not specified, runs an interactive shell in CONTAINER. "elsePID=$(docker inspect --format "{{.State.Pid}}" "$1")if [ -z "$PID" ]; thenexit 1fishiftOPTS="--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" $OPTS su - rootelse# Use env to clear all host environment variables. "$NSENTER" $OPTS env --ignore-environment -- "$@"fifi
Save exit, command line execution. docker_enter container ID or bash -x docker_enter.sh container ID, you can successfully enter the container
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