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I ran docker run ubuntu couple of times. When I list the containers using docker ps -a, it list down many containers with different ID. Why does docker creates new container every time instead of the one which is not in use? Doesn't that container occupies some space? Could someone please clarify ?
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If you are using docker-compose this might be useful to know. restart no is the default restart policy, and it does not restart a container under any circumstance. When always is specified, the container always restarts. The on-failure policy restarts a container if the exit code indicates an on-failure error.
Deselect 'Start Docker when you log in' on the General tab. Close the Preferences window. Quit Docker (Cmd-Q or use the menu).
If you want to stop a docker container here's the command to do it. The main process inside the container will receive SIGTERM, and after a grace period, SIGKILL. This will stop a running container. This would restart the container.
The no-new-privileges security option prevents the application processes inside the container from gaining new privileges during execution. So even if: there is a program with the setuid/setgid bit set in the image, such as sudo. a process in the container has (file) permissions to execute the program.
docker container run is a shorthand for docker container create and docker container start. So, by definition, it creates a new container every time.
$ docker container run --help
Usage: docker container run [OPTIONS] IMAGE [COMMAND] [ARG...]
Run a command in a new container
You can start stopped containers (perhaps created by docker container run) with docker container start ….
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