Working with a public registry
After building an image we can push it to one of the mainstream public registries. For this example we have created an account with https://hub.docker.com/ with the username
First we run the login command:
Docker will ask for a Docker ID and password to complete the 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: kjackal Password: *******
Pushing to the registry requires that the image is tagged with
your-hub-username/image-name:tag. We can either add proper tagging during build:
docker build . -t kjackal/mynginx:public
Or tag an already existing image using the image ID. Obtain the ID by running:
The ID is listed in the output:
REPOSITORY TAG IMAGE ID SIZE mynginx local 1fe3d8f47868 16.1MB ....
Then use the
docker tag 1fe3d8f47868 kjackal/mynginx:public
Now that the image is tagged correctly, it can be pushed to the registry:
docker push kjackal/mynginx
At this point we are ready to
microk8s kubectl apply -f a deployment with our image:
apiVersion: apps/v1 kind: Deployment metadata: name: nginx-deployment labels: app: nginx spec: selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: kjackal/mynginx:public ports: - containerPort: 80
We refer to the image as
image: kjackal/mynginx:public. Kubernetes will search for the image in its default registry,
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