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Introduction to Docker

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Docker Registries

4:01 with Jay McGavren and Jared Smith

One of the main reasons to move your app into a Docker image is to make it easy to share it with others. But you don't have to upload image files to Dropbox or publish them on a website. Registries provide a standardized way to share Docker images, kind of like Git repositories. With a Docker registry, you can upload images, and your users can download them and run them as containers with just a few simple commands.

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    One of the main reasons to move your app into a Docker image 0:00
    is to make it easy to share with others. 0:03
    But you don't have to upload image files to Dropbox or publish them on a website. 0:05
    Registries provide a standardized way to share Docker images, 0:10
    kind of like Git repositories. 0:14
    With a Docker registry, you can upload images and 0:16
    your users can download them with just a few simple commands. 0:20
    The docker login subcommand lets you connect to a docker registry. 0:24
    By default, it'll connect to Docker Hub, a public registry that offers both free and 0:29
    paid plans, kind of like GitHub does with git repos. 0:35
    You'll be prompted to visit hub.docker.com to create an account 0:38
    if you don't already have one. 0:42
    I've already created an account so I'll use my username, And password to log in. 0:43
    Let´s upload the mongodb image, that we created earlier. 0:51
    We do that with the docker push sub-command. 0:56
    We need to specify the name of the image we want to upload. 0:59
    Mongodb. 1:03
    When we hit enter, 1:05
    Docker will try to upload the image to our repository named library/mongodb. 1:07
    There is a problem though, we don't own the library repository and 1:12
    don't have access. 1:16
    We'll need to retag the image using a repository name that we do have access to. 1:17
    Fortunately that's really easy. 1:22
    An image can have many tags, we'll just add another tag to our existing image. 1:25
    We can do that with the docker tag subcommand. 1:29
    We provide the existing name for the image, mongodb, followed by a new tag. 1:34
    Docker Hub requires that images start with the Docker Hub username, so 1:40
    I'll use mine, dockern00b. 1:44
    Followed by a slash and then the name I want to use for 1:46
    this particular image, mongodb. 1:51
    When we hit Enter, the new tag will be added to the existing image. 1:54
    Now let's try uploading it, using the new tag, 1:59
    docker push dockern00b/mongodb. 2:05
    This time the upload will be successful and 2:10
    our image will be stored on the docker registry. 2:12
    With our image successfully uploaded, our users will be able to download and 2:19
    launch it as long as they have docker installed. 2:23
    If it's a public repository, they don't even need to be logged into docker hub. 2:26
    You can pull images from a docker registry with the docker pull subcommand. 2:30
    We need to provide the repository name that it was uploaded with, 2:36
    dockern00b/mongodb. 2:42
    Docker will connect to docker hub and download the image, 2:46
    when the download is complete, the'll be able to run it with docker run. 2:50
    As always for this image, They need to publish port 27017. 2:54
    So we'll run Docker, run -p 27017 2:58
    publish support 27017 and 3:04
    end with the image name, dockernoob/mongodb. 3:08
    So with the container running we can run the mongo command and 3:19
    we'll be able to connect successfully. 3:23
    Docker registries let you manage images, collaborate with co-workers, 3:26
    or simply manage the images you use locally for side projects. 3:30
    Docker is optimized for version control of images. 3:34
    And wherever possible, 3:37
    will avoid redownloading parts of images that it already has. 3:39
    Now we've covered how to manage images and containers from the command line. 3:43
    In the final stage, we'll build a Node.js app from scratch, build an image for 3:47
    it, run it as a container, and test it. 3:52
    And at the end of the course we'll recommend some next steps that will help 3:54
    you simplify operations and development using docker. 3:58

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