进入docker容器之nsenter脚本
docker-enter脚本内容如下：1
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root@zxl-node4:~# cat 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 "$0"` CONTAINER ...]"
echo ""
echo "Enters the Docker CONTAINER and executes the specified COMMAND."
echo "If COMMAND is not specified, runs an interactive shell in CONTAINER."
else
PID=$(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
赋予docker-enter执行权限
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root@zxl-node4:~# chmod +x docker-enter
使用docker-enter进入容器，实例如下：
查看一下运行的容器
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
571c7712daec jdeathe/centos-ssh:latest "/bin/bash" 5 hours ago Up 5 hours 22/tcp node4
0d935fcad74b jdeathe/centos-ssh:latest "/bin/bash" 5 hours ago Up 5 hours 22/tcp node2
c1e5cca51f2e jdeathe/centos-ssh:latest "/bin/bash" 23 hours ago Up 23 hours 22/tcp mysql
使用docker-enter进入容器node4
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root@zxl-node4:~# ./docker-enter node4
# 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
28: eth0: <BROADCAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP
link/ether 02:42:ac:11:00:0d brd ff:ff:ff:ff:ff:ff
inet 172.17.0.13/16 scope global eth0
valid_lft forever preferred_lft forever
inet6 fe80::42:acff:fe11:d/64 scope link
valid_lft forever preferred_lft forever
# hostname
571c7712daec
#
以上就是使用docker-enter进入容器！！！
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