Cheat Sheet

Install
Latest
snap install microk8s --classic
Specific version
snap install microk8s --classic --channel=1.17/stable
Set group
sudo usermod -a -G microk8s $USER
Logout from your workstation session and login again.
Useful commands
Get kubeconfig
microk8s.config > $HOME/.kube/config
Reset cluster
microk8s reset --destroy-storage
References
​https://microk8s.io/docs/commands​
Built-in Registry
Push
Pushing to this insecure registry may fail in some versions of Docker unless the daemon is explicitly configured to trust this registry. To address this we need to edit /etc/docker/daemon.json and add:
/etc/docker/daemon.json
{
  "insecure-registries" : ["localhost:32000"]
}
Then restart docker.
sudo systemctl restart docker
Enable registry, build and push image.
microk8s enable registry #20Gi registry
#microk8s enable registry:size=40Gi
​
# Build image
docker build . -t localhost:32000/myimage:registry
​
# Or tag an existing image
#docker tag 1fe3d8f47868 localhost:32000/myimage:registry
​
docker push localhost:32000/myimage:registry
Deploy it.
apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
  namespace: myapp
  labels:
    app: myapp
spec:
  selector:
    matchLabels:
      app: myapp
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: localhost:32000/myimage:registry
        imagePullPolicy: Always
        ports:
        - containerPort: 8000
Remove
Run on your workstation:
registry=localhost:32000
repositories=$(curl ${registry}/v2/_catalog)
for repo in $(echo "${repositories}" | jq -r '.repositories[]'); do
  echo $repo
  tags=$(curl -sSL "http://${registry}/v2/${repo}/tags/list" | jq -r '.tags[]')
  for tag in $tags; do
    echo $tag
    curl -v -sSL -X DELETE "http://${registry}/v2/${repo}/manifests/$(
      curl -sSL -I \
          -H "Accept: application/vnd.docker.distribution.manifest.v2+json" \
          "http://${registry}/v2/${repo}/manifests/$tag" \
      | awk '$1 == "Docker-Content-Digest:" { print $2 }' \
      | tr -d #x27;\r' \
    )"
  done
done
Then run:
registry_pod=$(kubectl --namespace="container-registry" get pods --template '{{range .items}}{{.metadata.name}}{{"\n"}}{{end}}')
kubectl exec --namespace="container-registry" $registry_pod /bin/registry garbage-collect /etc/docker/registry/config.yml
Local private registry
Allow insecure registry:
/etc/docker/daemon.json
{
  "insecure-registries" : ["172.17.0.1:5001"]
}
​
Restart docker.
sudo systemctl restart docker
Stop microk8s, backup and edit config file.
microk8s stop
sudo cp /var/snap/microk8s/current/args/containerd-template.toml /var/snap/microk8s/current/args/containerd-template.toml-BKP
nano /var/snap/microk8s/current/args/containerd-template.toml
Add the following section.
...
  [plugins."io.containerd.grpc.v1.cri".registry]
...
    [plugins."io.containerd.grpc.v1.cri".registry.mirrors]
...
      [plugins."io.containerd.grpc.v1.cri".registry.mirrors."172.17.0.1:5001"]
        endpoint = ["http://172.17.0.1:5001"]
Start microk8s.
microk8s start
Start local registry.
docker run -it --rm \
  -e REGISTRY_HTTP_ADDR=0.0.0.0:5001 \
  -p 5001:5001 \
  --name local-registry \
  registry:2
Tag and push image.
docker tag ubuntu:18.04 172.17.0.1:5001/my-ubuntu:0.0.1
docker push 172.17.0.1:5001/my-ubuntu:0.0.1
curl 172.17.0.1:5001/v2/_catalog
Test it.
microk8s kubectl run -it --rm tmp --image=172.17.0.1:5001/my-ubuntu:0.0.1
References
​https://microk8s.io/docs/registry-private​
​
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