Sometimes it is necessary to modify the configuration of the container for some reasons, such as port mapping and mounting path, but if you delete the container and then re-run, then the previous changes made in the container will be lost, this article provides two methods, you can Modify the configuration parameters while retaining the modifications.
Method 1: Save the container as an image
1. Stop the container
docker stop CONTAINER
2. Save the container as a new image
docker commit CONTAINER NEWIMAGE:TAG
3. Start a new image, at this time you can re-specify parameters
docker run --name CONTAINER OPTIONS NEWIMAGE:TAG
Method two directly modify the container configuration file
1. Obtain the container configuration file path and stop the container
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",
}
Intercept part of the output as shown above. Among them, / var / lib / docker / containers / 96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14 / is the configuration folder, and stop the container after recording the path.
docker stop CONTAINER
2. Enter linuxkit
(1) Enter in the terminal:
screen ~/Library/Containers/com.docker.docker/Data/vms/0/tty
Tip：
-Press ctrl + a + k and press y to confirm to kill this screen
-Use ctrl + a + d to temporarily exit this screen, and if you need to enter again, you should use screen -dr, you cannot use screen ~ / Library again /Containers/com.docker.docker/Data/vms/0/tty, this command will create a screen again and cause some inexplicable problems
(2) Enter the configuration folder:
cd /var/lib/docker/containers/96b9323df1569e83c9945a9daab253c7c5e6cab35cd4b5eb19b16913e130cd14/
(3) Modify the configuration file
You need to modify both the hostconfig.json and config.v2.json files in this directory
Modify port mapping
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":{}}
}
Modify the mount path
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) Restart the docker service
After saving, exit the screen and restart the docker service.
Check if the settings are effective and you can run
docker inspect CONTAINER
Check whether the configuration just took effect in the two keywords "Mounts" and "Ports".