进入docker容器之nsenter
每次进入docker容器都是都是docker exec ......,这样执行感觉太费劲了，网上搜了一下资料，有个nsenter命令可以直接跟容器ID或者容器名字进行容器内，so...比较方面。下载开始安装..操作系统环境
root@zxl-node4:~# lsb_release -a
No LSB modules are available.
Distributor ID:Ubuntu
Description:Ubuntu 14.04.3 LTS
Release:14.04
Codename:trusty
root@zxl-node4:~# uname -r
3.19.0-25-generic
root@zxl-node4:~# uname -m
x86_64 源码安装nsenter
root@zxl-node4:/usr/local/src# wget https://www.kernel.org/pub/linux/utils/util-linux/v2.26/util-linux-2.26.tar.gz
root@zxl-node4:/usr/local/src# tar fxz util-linux-2.26.tar.gz
root@zxl-node4:/usr/local/src# cd util-linux-2.26
root@zxl-node4:/usr/local/src/util-linux-2.26# ./configure --without-python --disable-all-programs --enable-nsenter --without-ncurses
root@zxl-node4:/usr/local/src/util-linux-2.26# make nsenter
root@zxl-node4:/usr/local/src/util-linux-2.26# cp nsenter /usr/local/bin
如何使用nsenter进入容器呢？
首先获取容器pid，示例如下：
root@zxl-node4:~# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
7237c3c12e68 jdeathe/centos-ssh:latest "/bin/bash" 5 hours ago Up 5 hours 22/tcp node5
获取容器的pid
root@zxl-node4:~# pid=$(docker inspect --format "{{ .State.Pid }}" 7237c3c12e68)
root@zxl-node4:~# echo $pid
14947 使用nsenter进入容器
root@zxl-node4:~# nsenter --target $pid --mount --uts --ipc --net --pid
# ls
bindata-node1devetchomeliblib64lost+foundmediamntoptprocrootsbinselinuxsrvsystmpusrvar
# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
30: eth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 02:42:ac:11:00:0e brd ff:ff:ff:ff:ff:ff
inet 172.17.0.14/16 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::42:acff:fe11:e/64 scope link
valid_lft forever preferred_lft forever
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