K8S Load Docker Image

This article provides a comprehensive guide on building, uploading, and loading Docker images for Kubernetes-based microk8s or Minikube. Additionally, it covers the process of importing images specifically for lightweight K3s distribution that utilizes the Docker container runtime.

first of all, you can build and upload docker image to registry.

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docker login
docker build -t <username>/<imagename>:<tag> -f <dockerfile> <resource_path>
docker push <username>/<imagename>:<tag>

you can upload to docker.io or microk8s provided local registry.

https://microk8s.io/docs/registry-built-in

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# for microk8s the registry address is localhost:32000
docker tag <imagename> <registry_addr>/<imagename>
docker push <registry_addr>/<imagename>

you can also build image with minikube:

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minikube image build -t <imagename> -f <dockerfile_path> <resource_path>

load image exported with docker save <image>:<tag>

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# ref: https://minikube.sigs.k8s.io/docs/commands/image/
# remember to set a tag to the image imported
# or set the imagePullPolicy to Never
# ref: https://iximiuz.com/en/posts/kubernetes-kind-load-docker-image/
minikube image load <image_filepath>/<docker_image_name>
microk8s images import <image_filepath>
microk8s ctr image import <image_filepath>
k3s ctr image import <image_filepath>

https://blog.scottlowe.org/2020/01/25/manually-loading-container-images-with-containerd/

https://docs.k3s.io/installation/registry-mirror#pushing-images

you can also configure k8s to use docker as container runtime instead.

https://github.com/canonical/microk8s/issues/287

https://docs.k3s.io/advanced#using-docker-as-the-container-runtime

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