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Managing Images
1:57Now that you know the basics of creating Docker images and containers, it probably won't be long before you build up a substantial collection. Let's look at some features Docker has provided to help you manage your images.
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It probably won't be long before you build
up big collections of Docker images and
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containers.
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Let's look at some features Docker's
provided to help you manage them.
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For this part of the course
you'll need this Docker file
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in a supporting script saved in
a directory on your computer.
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See the teacher's notes for
info on retrieving them.
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Let's build an image based
on this Docker file.
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Changing of the directory
where the files are stored.
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We'll use the docker build command again.
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And give it a tag of mongo DB,
so -t mongodb.
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And we'll say to look for
a Docker file in the current directory.
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When we hit Enter, Docker build
will carry out all the instructions
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in the Docker file, and will tag
the resulting image as mongodb latest.
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We can get a list of the images on your
Docker host with the Docker images
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sub-command.
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We'll see the MongoDB image
we've just created in the list,
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with a default tag of latest.
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The output will also include
other info about each image,
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like when it was created, and its size.
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I also see a temp image that we
created earlier in the list.
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We don't need that anymore,
so let's get rid of it.
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We can use the docker rmi subcommand,
which stands for remove image.
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And we pass it the tag of
the image we want to remove, temp.
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At this point we'll get an error if there
are any containers still around that
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are based on this image,
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because the containers won't be able
to start if we remove the image.
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We'll show you how to remove those
containers in the next video so
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that we can remove the image cleanly.
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Be sure to check the teacher's notes for
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links where you can read up on
Docker's image management commands.
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