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I have a running docker container. I have done some useful works in the running docker container. I have done these works not part of dockerfile, i have done it inside the container.[Eg: I have installed ping inside the container, not from docker file]
Now, i got stuck at a place. I am not sure if i debug in the same container, i may loose the thing that i have done so far inside that container.
So i would like to create a duplicate copy of it with all the things available in that running container[like i don't want to build a container from image and repeat all the suucessful steps achieved in the running container and then start my debuggging. I don't want to re-install ping in my second container].
Totally, How can i duplicate a container? If not what are all the possibilities?
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To 'clone' a container, you'll have to make an image of that container first, you can do so by "committing" the container. Docker will (by default) pause all processes running in the container during commit to preserve data-consistency. Commit my_container as an image called my_container_snapshot , and tag it yymmdd .
Method 1: You can use the -t (pseudo-tty) docker parameter to keep the container running. Method 2: You can run the container directly passing the tail command via arguments as shown below. Method 3: Another method is to execute a sleep command to infinity.
To summarize, follow these steps to copy a file from a Docker container to a host machine: Obtain the name or id of the Docker container. Issue the docker cp command and reference the container name or id. The first parameter of the docker copy command is the path to the file inside the container.
Multiple containers can run with the same volume when they need access to shared data. Docker creates a local volume by default.
Create a base image and run it
docker run -it <base_image> /bin/bash Make necessary changes
yum install ping Commit it with a new name
docker commit <hash tag of running container> new_image Now if you open new_image by running
docker run -it new_image /bin/bash You can see ping is installed in it.
Open base_image and there is no ping installed in it.
Hope it answered your question.
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