Docker/Kubernetes workshop
In this exercise you will publish your previously built Docker image to a public Docker Hub Container Registry registry.
Publishing is done via the docker push command. However, if you were to use that right now Docker would attempt to push your images to the public Docker Hub (and could fail as you may be not logged in the Docker Hub).
To let Docker know you want to publish to our own registry, you need to tag the image with the registry server location (address:port).
The Docker registry used for this workshop is rotcaus/dockerfundamentals (Docker Hub).
When tagging an image, a recommended practice is to add a version to the tag name. From now on, we will use the team name as the version to tag all our Docker images.
Update the TEAM_NAME environment variable with your own team name in the following command and run it to tag the twkoins_webui Docker image.
If you are using PowerShell on Windows:
$env:TEAM_NAME="[team-name-placeholder]"
docker tag twkoins_webui rotcaus/twkoins_webui:$env:TEAM_NAME
If you are on MacOS:
export TEAM_NAME="joe"
docker tag twkoins_webui rotcaus/twkoins_webui:${TEAM_NAME}
Check the image listing:
docker images | grep twkoins_webui
The expected output should be similar to this:
# ==> Outputs:
twkoins_webui latest 34d55f835d15 31 minutes ago 218MB
rotcaus/twkoins_webui trainers 34d55f835d15 31 minutes ago 218MB
Note that tagging an image does not create a new image. It only creates another reference to the same image. This can be seen by the shared image IDs (3rd column in the console output).
Docker HUB
Logout from your current user account:
docker logout
Use the rotcaus Docker account to login:
# You'll be prompted for a password
docker login --username rotcaus
You can push the twkoins_webui Docker image with the following commands:
# Windows only
docker push rotcaus/twkoins_webui:$env:TEAM_NAME
# MacOS only
docker push rotcaus/twkoins_webui:${TEAM_NAME}
This may take some time…