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So if you were to add a layer to the image, you can simply add. Now since each Dockerfile command represents one layer of the image, modifying each line of a Dockerfile will change the respective image as well. Modifying a docker image essentially means modifying the layers of an image.
• We then stopped it and then tried to list it out with the docker ps command but did not see it. Method 1: Modifying docker image through the Dockerfile. docker run -it -rmWe then listed the background running container out with docker ps command.
![docker run image cmd docker run image cmd](https://i.stack.imgur.com/8GY1l.png)
We started a new container in detached mode without the -rm option this time.$ docker run -P -d boltops/docker-tutorialĥ8697156b762001ea6a6a8565223054a5df2535b8abe335346ec2822afdae335ĬONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMESĥ8697156b762 boltops/docker-tutorial "/usr/sbin/httpd -DF…" 5 seconds ago Up 5 seconds 0.0.0.0:32769->80/tcp mystifying_curieĥ8697156b762 boltops/docker-tutorial "/usr/sbin/httpd -DF…" 2 minutes ago Exited (0) 4 seconds ago mystifying_curie Usually, it starts a webserver and exposes the port to listen on. Sometimes instead of starting a bash shell, I start the Docker container and let it run its default CMD command. Just run exit or hit ctrl-D like you normally would. To exit out of the docker container bash shell. This makes it so the bash shell you’re launching behave more like a normal command shell. It’s easy to remove the Exited containers but the -rm will automatically clean house for you. Without this option, what ends up happening after playing with a few containers is that you’ll end up with a bunch of “Exited” containers that show up with docker ps -a. roothost docker ps -a CONTAINER ID IMAGE COMMAND. Once you exit from the container the docker container will automatically be removed. The -a option to docker ps displays all containers that are currently running or that have exited. Let’s cover the options and their purposes: Option The Docker image becomes a container when the execution engine loads the image and adds an extra layer that makes it runnable. When I’m jumping into bash shell to explore, I find myself using these docker run options: -rm -ti. The command above starts a docker container and puts you into a bash command. ENTRYPOINT configures a container that will run as an executable. CMD sets default command and/or parameters, which can be overwritten from command line when docker container runs.
#Docker run image cmd software
E.g., it is often used for installing software packages. Server version: Apache/2.4.6 (Amazon Linux 2)Ĭonf conf.d logs modules run RUN executes command (s) in a new layer and creates a new image. $ docker run -rm -ti boltops/docker-tutorial bash