If you find yourself connecting to a Docker container, so you could investigate an issue, update a .conf file, or whatever other reason, you are doing an anti-pattern. However, if you really want to create a “snapshot” out of a running Docker container, you need to create a Docker image first. Thus, here are the steps required to do so.
Prerequisites
- Docker
Solution
Step 1. List, find and copy the Docker container name. For example:
docker ps -a
Step 2. Commit the container.
docker commit redis_test
Note: The container doesn’t really need to be running though. Could be stopped as well, known as an Exited state.
Step 3. Tag the Docker image. For instance:
docker tag f2576d0b2d25 devcoops/redis_test:latest
Note(s):
- Replace
devcoopswith your actual Docker repository hosting provider username, if any. The format usually goes something as:<docker_username>/<docker_repo_name>. For instance:devcoops/redis. A corresponding AWS example would be:<some_AWS_ID>/dkr.ecr.eu-west-1.amazonaws.com/<docker_repo_name>. If not, pick some name of your choice. - To commit and tag the Docker image with a single command, run:
docker commit redis_test devcoops/redis_test:latest
Step 4. Confirm the Docker image.
docker images
Step 5. (Optional) Stop and remove the old container.
docker stop redis_test && docker rm redis_test
Step 6. Spin up a new container from the recently created image.
docker run --it -d devcoops/redis_test:latest
Conclusion
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