进入docker容器并执行命令的的3中方法
- docker exec
- nsenter
- docker attach "container"
建议使用nsenter, exec有时候会有问题。 attach执行完之后会自动退出
exec需要在运行中的容器中执行：
nsenter需要安装，默认最小安装里面有,yum -y install util-linux
attach需要是启动的容器，退出的需要使用start先启动- docker
start CONTAINER(使用attach进入容器后退出后容器会退出)
[root@docker01 ~]# docker --help|grep exec
exec Run a command in a running container
[root@docker01 ~]# docker ps
CONTAINER ID
IMAGE COMMAND CREATED STATUS PORTS NAMES
9218c822d3a5
docker.io/centos
"/bin/bash"
11 hours ago Up 11 hours cent03
e4d5b979923b
docker.io/centos
"bash"
21 hours ago Up 11
hours cent02
fe7ab7cd9ec0
bash
"docker-entrypoint..."
21 hours ago Up 12 hours cent01
216dc5feb799 8b89e48b5f15
"/bin/bash" 21 hours ago Up 12 hours
80/tcp nginx02
[root@docker01 ~]# docker exec cent01 route
Kernel IP routing table
Destination
Gateway Genmask Flags Metric Ref Use Iface
default
172.17.0.1 0.0.0.0 UG
0 0 0 eth0
172.17.0.0
* 255.255.0.0 U
0 0 0 eth0
[root@docker01 ~]#
[root@docker01 scripts]# rpm -ql util-linux|grep
nsenter
/usr/bin/nsenter
/usr/share/bash-completion/completions/nsenter
/usr/share/man/man1/nsenter.1.gz
[root@docker01 scripts]# rpm -ql util-linux|grep
nsenter
exec直接进入bash的方法:
[root@docker01 work]# docker exec -it cent02
/bin/bash
[root@e4d5b979923b /]# cat /etc/hosts
127.0.0.1
localhost
::1
localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
172.17.0.4
e4d5b979923b
直接去下载了httpd的容器并启动80端口的httpd服务。
[root@docker01 scripts]# docker run -d -p 83:80
--name cent_80 httpd
Unable to find image 'httpd:latest' locally
Trying to pull repository docker.io/library/httpd ...
latest: Pulling from docker.io/library/httpd
d660b1f15b9b: Pull complete
aa1c79a2fa37: Pull complete
f5f6514c0aff: Pull complete
676d3dd26040: Pull complete
4fdddf845a1b: Pull complete
28ecdadc5f88: Pull complete
5d882098e42b: Pull complete
Digest:
sha256:2edbf09d0dbdf2a3e21e4cb52f3385ad916c01dc2528868bc3499111cc54e937
Status: Downloaded newer image for
docker.io/httpd:latest
c720d0aa41860f2d88cd652f395d52279f0a485b7852da5d7fce4627ac7ef816
[root@docker01 scripts]# curl 10.0.0.181:83
<html><body><h1>It works!</h1></body></html>