Run your own container registry

any cluster configuration must be performed by experienced users or platform administrators.

Here we propose some possible options, each of them has its pros and cons.

Run in the same infrastructure of the Cluster

With this topology we may expect that the container registry is operated in the same infrastructure of the cluster and the cluster’s components can reach it accordingly. As each registry and each cluster can have different configuration, we cannot give specific hints on how to deploy such configuration.

Run as a Pod

This is the approach used by Minikube. Basically it deploys a container registry as a Pod, and you can use the service cluster IP. We cannot use the service URL as it won’t be available in the Kubernetes components which are in charge to run the Deployment (it does not use Service/Pod cluster DNS). However, it can use the Cluster IP which is available throughout all the cluster or any Ingress which would expose the service publicly.

if you make sure that the registry cluster IP does not change over time or you use a public address, the approach could be used for production use cases.

The following example can be used as a base for your solution and should not be considered for production use cases as it does not configure any storage neither any security measure:

---
apiVersion: v1
kind: Service
metadata:
  name: registry
spec:
  selector:
    app: registry
  ports:
    - protocol: TCP
      port: 80
      targetPort: 5000
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: registry
spec:
  selector:
    matchLabels:
      app: registry
  template:
    metadata:
      labels:
        app: registry
    spec:
      containers:
        - name: registry
          image: registry:2
          ports:
            - containerPort: 5000
              name: 5000-tcp
          volumeMounts:
            - name: registry-data
              mountPath: /registry-data
      volumes:
        - name: registry-data
          emptyDir: {}

If you apply this configuration, a registry Pod will be started and you can use it by checking the Service cluster IP:

NAME       TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)   AGE
registry   ClusterIP   10.96.112.40   <none>        80/TCP    23h

$ kamel install --registry 10.96.112.40

The above installation should be able to push and pull Integration images correctly.

Run as a Docker image

This is the approach used by Kind in order to make a registry available. You can follow the guidelines and it may work in particular situations in any cluster beside Kind. However, as it involves hacks in the cluster configuration, make sure to understand the effects of the changes you’re going to perform.

not recommended for production use cases unless you know what you’re doing.
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