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It probably won't be long before you build up big collections of Docker images and

containers.

Let's look at some features Docker's provided to help you manage them.

For this part of the course you'll need this Docker file

in a supporting script saved in a directory on your computer.

See the teacher's notes for info on retrieving them.

Let's build an image based on this Docker file.

Changing of the directory where the files are stored.

We'll use the docker build command again.

And give it a tag of mongo DB, so -t mongodb.

And we'll say to look for a Docker file in the current directory.

When we hit Enter, Docker build will carry out all the instructions

in the Docker file, and will tag the resulting image as mongodb latest.

We can get a list of the images on your Docker host with the Docker images

sub-command.

We'll see the MongoDB image we've just created in the list,

with a default tag of latest.

The output will also include other info about each image,

like when it was created, and its size.

I also see a temp image that we created earlier in the list.

We don't need that anymore, so let's get rid of it.

We can use the docker rmi subcommand, which stands for remove image.

And we pass it the tag of the image we want to remove, temp.

At this point we'll get an error if there are any containers still around that

are based on this image,

because the containers won't be able to start if we remove the image.

We'll show you how to remove those containers in the next video so

that we can remove the image cleanly.

Be sure to check the teacher's notes for

links where you can read up on Docker's image management commands.