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Introduction to Docker

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Managing Images

1:57 with Jay McGavren and Jared Smith

Now 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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    [MUSIC] 0:00
    It probably won't be long before you build up big collections of Docker images and 0:04
    containers. 0:09
    Let's look at some features Docker's provided to help you manage them. 0:09
    For this part of the course you'll need this Docker file 0:13
    in a supporting script saved in a directory on your computer. 0:16
    See the teacher's notes for info on retrieving them. 0:20
    Let's build an image based on this Docker file. 0:23
    Changing of the directory where the files are stored. 0:26
    We'll use the docker build command again. 0:31
    And give it a tag of mongo DB, so -t mongodb. 0:34
    And we'll say to look for a Docker file in the current directory. 0:41
    When we hit Enter, Docker build will carry out all the instructions 0:44
    in the Docker file, and will tag the resulting image as mongodb latest. 0:49
    We can get a list of the images on your Docker host with the Docker images 1:00
    sub-command. 1:05
    We'll see the MongoDB image we've just created in the list, 1:07
    with a default tag of latest. 1:11
    The output will also include other info about each image, 1:14
    like when it was created, and its size. 1:19
    I also see a temp image that we created earlier in the list. 1:21
    We don't need that anymore, so let's get rid of it. 1:25
    We can use the docker rmi subcommand, which stands for remove image. 1:27
    And we pass it the tag of the image we want to remove, temp. 1:33
    At this point we'll get an error if there are any containers still around that 1:38
    are based on this image, 1:42
    because the containers won't be able to start if we remove the image. 1:43
    We'll show you how to remove those containers in the next video so 1:46
    that we can remove the image cleanly. 1:50
    Be sure to check the teacher's notes for 1:51
    links where you can read up on Docker's image management commands. 1:53

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