Docker修改容器的端口映射和挂载路径

Posted 2021-03-01 lonelyxmas

原文:Docker修改容器的端口映射和挂载路径

有时候因为某些原因需要修改容器的配置，如端口映射和挂载路径，但是如果删除容器后再重新运行，那么之前在容器内所做的修改就丢失了，本文提供了两种方法，可以在保留修改的同时修改配置参数。

方法一：将容器保存为镜像

1、停止容器

docker stop CONTAINER

2、将容器保存为新的镜像

docker commit CONTAINER NEWIMAGE:TAG

3、启动新的镜像，此时可以重新指定参数

docker run --name CONTAINER OPTIONS NEWIMAGE:TAG

方法二 直接修改容器配置文件

1、获取容器配置文件路径并停止容器

docker inspect CONTAINER

{
"ResolvConfPath": "/var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/resolv.conf",
"HostnamePath": "/var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/hostname",
"HostsPath": "/var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/hosts",
"LogPath": "/var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14-json.log",
}

截取部分输出，如上所示。其中，/var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/即为配置文件夹，记录下路径后停止容器。

docker stop CONTAINER

2、进入linuxkit

(1)在终端中输入：

screen ~/Library/Containers/com.docker.docker/Data/vms/0/tty

Tip：

-按ctrl+a+k，再按y确认即可kill掉这个screen
-使用ctrl+a+d可暂时退出这个screen，而如需再次进入则应当使用screen -dr，不能再次使用screen ~/Library/Containers/com.docker.docker/Data/vms/0/tty，该命令会再次创建一个screen而产生一些莫名其妙的问题

(2)进入配置文件夹：

cd /var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/

(3)修改配置文件

需要同时修改该目录下hostconfig.json和config.v2.json两个文件

修改端口映射

hostconfig.json

{
"PortBindings":{"8080/tcp":[{"HostIp":"0.0.0.0","HostPort":"22"}],
                "9090/tcp":[{"HostIp":"0.0.0.0","HostPort":"9999"}]}
}

config.v2.json

{
"ExposedPorts":{"8080/tcp":{},"9090/tcp":{}}
}

修改挂载路径

hostconfig.json

{
"Binds": ["/data:/mnt/data", "/home/logs:/logs"]
}

config.v2.json

{
"MountPoints":{"/mnt/data":{"Source":"/data","Destination":"/mnt/data","RW":true,"Name":"","Driver":"","Type":"bind","Propagation":"rprivate","Spec":{"Type":"bind","Source":"/data","Target":"/mnt/data"},"SkipMountpointCreation":false},
               "/home/logs":{"Source":"/home/logs","Destination":"/logs","RW":true,"Name":"","Driver":"","Type":"bind","Propagation":"rprivate","Spec":{"Type":"bind","Source":"/home/logs","Target":"/logs"},"SkipMountpointCreation":false}}
}

(4)重启docker服务

保存后退出screen并重启docker服务。
检查设置是否生效可以运行

docker inspect CONTAINER

在"Mounts"、"Ports"两个关键字中查看刚刚的配置有没有生效。