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I am getting into Docker and am trying to better understand how it works out there in the "real world".
It occurs to me that, in practice:
Does Docker ship with built-in commands for handling each of these? If not what tools/strategies are used for accomplishing them? Also, when I build a Docker image (via, say, docker build -t myapp .), what file type is produced and where is it located on the machine?
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Docker Container Lifecycle Management The lifecycle of a docker container consists of five states: Created state. Running state. Paused state/unpaused state. Stopped state.
As discussed above, Docker containers ensure consistency across multiple development and release cycles, standardizing your environment. On top of that, Docker containers work just like GIT repositories, allowing you to commit changes to your Docker images and version control them.
If you use the default storage driver overlay2, then your Docker images are stored in /var/lib/docker/overlay2 . There, you can find different files that represent read-only layers of a Docker image and a layer on top of it that contains your changes.
docker has all you need to build images and run containers. You can create your own image by writing a Dockerfile or by pulling it from the docker hub.
In the Dockerfile you specify another image as the basis for your image, run command install things. Images can have tags, for example the ubuntu image can have the latest or 12.04 tag, that can be specified with ubuntu:latest notation.
Once you have built the image with docker build -t image-name . you can create containers from that image with `docker run --name container-name image-name.
docker ps to see running containers
docker rm <container name/id> to remove containers
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