How to modify the contents of an existing Docker container

1. Docker ps lists containers

2. Docker cp copies files to the container

Note: How to copy and transfer files between the host and the container in Docker

1. Copy files from the container to the host

docker cp mycontainer:/opt/testnew/file.txt /opt/test/

2. Copy files from the host to the container

docker cp /opt/test/file.txt mycontainer:/opt/testnew/

It should be noted that the copy command will take effect regardless of whether the container is started or not.

When we are finished, we exit using exit and now that our container has been modified, we commit the updated copy using the docker commit command.

3. Submit changes

$ sudo docker commit -m "description content" -a "author name" 32555789dd00 aipaper/devinz83:v2

Among them, -m specifies the submission description information, just like the version control tool we use; -a can specify the updated user information; followed by the ID of the container used to create the image; and finally, the warehouse name and tag information of the target image are specified. After successful creation, the image ID information will be returned.

4. Use docker images to view the newly created image.

docker images 

5. Modify the yml file

Use the new image

6. Redeploy, that is, deploy the docker application using the newly modified image.

docker stack deploy --compose-file=/opt/docker/yml/docker-compose-resty-redis.yml resty_redis

Attachment: Lua script that can add redis cluster password, portal.

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