You can use it or just the 2/3 first characters to go into your container using: Run the container in the background, allowing your terminal to be free for other commands. You shouldn't need to manually look up its id in most cases.
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This is similar to how some programs might write out their process id to a file (you might've. Then you should create and start a container with docker run image. Docker ps gives you a container id.
Assign a custom name to your container for easy identification.
Obtaining a docker container id by name is a simple but crucial procedure for managing docker environments. If you can share the dockerfile in your question then it would be easier to understand what arguments to. You have to name your container and specify container name in the docker exec command, not image name. To help with automation, you can have docker write the container id out to a file of your choosing.
And you can stop it using docker stop container_id and docker rm. Docker allows you to not specify the cmd in the docker file, however in that case you need to provide the command when doing docker run. When you build an image from a dockerfile, or when committing it, you can set a number of default parameters that take effect when the image starts up as a container. If you know the container name, you can just pass it directly as an argument;
