How to test the container or image after docker build?

You have to give a command your container will have to process.

Example : sh

you could try :

docker run -ti yourimage sh

(-ti is used to keep a terminal open)

If you want to launch a daemon (like a server), you will have to enter something like :

docker run -d yourimage daemontolaunch

Use docker help run for more options.

You also can set a default behaviour with CMD instruction in your Dockerfile so you won't have to give this command to your container each time you want to run it.

EDIT - about container removing :

Containers and images are different. A container is an instance of an image. You can run several containers from the same image.

The container automatically stops when the process it runs terminates. But the container isn't deleted (just stopped, so you can restart it). But if you want to remove it (removing a container doesn't remove the image) you have two ways to do :

• automatically removing it at the end of the process by adding --rm option to docker run.

• Manually removing it by using the docker rm command and giving it the container ID or its name (a container has to be stopped before being removed, use docker stop for this).

A usefull command :

Use docker ps to list containers. -q to display only the container IDs, -a to display even stopped containers.

More here.

EDIT 2:

This could also help you to discover docker if you didn't try it.

How to test the container or image after docker build?

In order to test you can add write a bash script which will do the job https://blog.brazdeikis.io/posts/docker-image-tests

Btw, from the post, I see that it does not match the question from the title.

So, Added a link for the souls who arrived here based on the title...