Publishing images to the Docker Hub

See also

• https://avril2018.container.training/intro.yml.html#213

• https://avril2018.container.training/intro.yml.html#9

• Les conseils et formations de Jérôme Petazzoni

Contents

• Publishing images to the Docker Hub

  • Publishing images to the Docker Hub

  • Logging into our Docker Hub account

  • Image tags and registry addresses

  • Image tags and registry addresses

  • Tagging an image to push it on the Hub

    • figlet Dockerfile

Publishing images to the Docker Hub

See also

• https://avril2018.container.training/intro.yml.html#214

We have built our first images.

We can now publish it to the Docker Hub!

You don’t have to do the exercises in this section, because they require an account on the Docker Hub, and we don’t want to force anyone to create one.

Note, however, that creating an account on the Docker Hub is free (and doesn’t require a credit card), and hosting public images is free as well.

Logging into our Docker Hub account

See also

• https://avril2018.container.training/intro.yml.html#215

This can be done from the Docker CLI:

docker login

Login with your Docker ID to push and pull images from Docker Hub.
If you don't have a Docker ID, head over to https://hub.docker.com
to create one.

Username: id3pvergain

Password:

Login Succeeded

Image tags and registry addresses

See also

• https://avril2018.container.training/intro.yml.html#216

• Docker images tags are like Git tags and branches.

• They are like bookmarks pointing at a specific image ID.

• Tagging an image doesn’t rename an image: it adds another tag.

• When pushing an image to a registry, the registry address is in the tag.

• Example: registry.example.net:5000/image

• What about Docker Hub images?

Image tags and registry addresses

See also

• https://avril2018.container.training/intro.yml.html#217

    - Docker images tags are like Git tags and branches.
    - They are like bookmarks pointing at a specific image ID.
    - Tagging an image doesn't rename an image: it adds another tag.
    - When pushing an image to a registry, the registry address is in the tag.
- Example: registry.example.net:5000/image

• What about Docker Hub images?

• jpetazzo/clock is, in fact, index.docker.io/jpetazzo/clock

• ubuntu is, in fact, library/ubuntu, i.e. index.docker.io/library/ubuntu

Tagging an image to push it on the Hub

See also

• https://avril2018.container.training/intro.yml.html#218

• https://avril2018.container.training/intro.yml.html#219

figlet Dockerfile

# cat Dockerfile

FROM ubuntu
RUN apt-get update
RUN ["apt-get", "install", "figlet"]
ENTRYPOINT ["figlet", "-f", "script"]
CMD ["hello world"]

Let’s tag our figlet image (or any other to our liking)

docker tag figlet id3pvergain/figlet

docker push id3pvergain/figlet

[root@intranet-dev myimage]# docker tag figlet id3pvergain/figlet
[root@intranet-dev myimage]# docker push id3pvergain/figlet
The push refers to repository [docker.io/id3pvergain/figlet]
6a460659e0ae: Pushed
3023de562a6f: Pushed
059ad60bcacf: Mounted from library/ubuntu
8db5f072feec: Mounted from library/ubuntu
67885e448177: Mounted from library/ubuntu
ec75999a0cb1: Mounted from library/ubuntu
65bdd50ee76a: Mounted from library/ubuntu
latest: digest: sha256:b239196e33c151a85c6bea76bb3eecaedea8ea43d811d0d3aba7ed32efa9e919 size: 1779

Anybody can now docker run id3pvergain/figlet anywhere.