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Using private Docker registry

KubeDB operator supports using private Docker registry. This tutorial will show you how to use KubeDB to run Redis server using private Docker images.

Before You Begin

  • Read concept of Redis Version Catalog to learn detail concepts of RedisVersion object.

  • You need to have a Kubernetes cluster, and the kubectl command-line tool must be configured to communicate with your cluster. If you do not already have a cluster, you can create one by using kind.

  • To keep things isolated, this tutorial uses a separate namespace called demo throughout this tutorial. Run the following command to prepare your cluster for this tutorial:

    $ kubectl create ns demo
    namespace/demo created
  • You will also need a docker private registry or private repository. In this tutorial we will use private repository of docker hub.

  • You have to push the required images from KubeDB’s Docker hub account into your private registry. For redis, push DB_IMAGE, TOOLS_IMAGE, EXPORTER_IMAGE of following RedisVersions, where deprecated is not true, to your private registry.

$ kubectl get redisversions -n kube-system,VERSION:.spec.version,INITCONTAINER_IMAGE:.spec.initContainer.image,DB_IMAGE:.spec.db.image,EXPORTER_IMAGE:.spec.exporter.image
4.0.11     4.0.11    kubedb/redis-init:0.7.0   kubedb/redis:4.0.11     kubedb/redis_exporter:v0.21.1
4.0.6-v2   4.0.6     kubedb/redis-init:0.7.0   kubedb/redis:4.0.6-v2   kubedb/redis_exporter:v0.21.1
5.0.14     5.0.14    kubedb/redis-init:0.7.0   redis:5.0.14            kubedb/redis_exporter:1.9.0
6.2.14   5.0.3     kubedb/redis-init:0.7.0   kubedb/redis:6.2.14   kubedb/redis_exporter:v0.21.1
6.0.20      6.0.20     kubedb/redis-init:0.7.0   kubedb/redis:6.0.20      kubedb/redis_exporter:1.9.0
6.2.14      6.2.14     kubedb/redis-init:0.7.0   redis:6.2.14             kubedb/redis_exporter:1.9.0
6.2.14      6.2.14     kubedb/redis-init:0.7.0   redis:6.2.14             kubedb/redis_exporter:1.9.0
6.2.14      6.2.14     kubedb/redis-init:0.7.0   redis:6.2.14             kubedb/redis_exporter:1.9.0
7.0.4      7.0.4     kubedb/redis-init:0.7.0   redis:7.0.4             kubedb/redis_exporter:1.9.0
7.0.14      7.0.14     kubedb/redis-init:0.7.0   redis:7.0.14             kubedb/redis_exporter:1.9.0
7.0.6      7.0.6     kubedb/redis-init:0.7.0   redis:7.0.6             kubedb/redis_exporter:1.9.0

Docker hub repositories:

  • kubedb/operator

  • kubedb/redis

  • kubedb/redis_exporter

  • Update KubeDB catalog for private Docker registry. Ex:

    kind: RedisVersion
      name: 6.2.14
        image: PRIVATE_DOCKER_REGISTRY:6.0.20
        image: PRIVATE_DOCKER_REGISTRY:1.9.0
        databasePolicyName: redis-db
      version: 6.0.20

Create ImagePullSecret

ImagePullSecrets is a type of Kubernetes Secret whose sole purpose is to pull private images from a Docker registry. It allows you to specify the url of the docker registry, credentials for logging in and the image name of your private docker image.

Run the following command, substituting the appropriate uppercase values to create an image pull secret for your private Docker registry:

$ kubectl create secret docker-registry -n demo myregistrykey \
  --docker-server=DOCKER_REGISTRY_SERVER \
  --docker-username=DOCKER_USER \
  --docker-email=DOCKER_EMAIL \
secret/myregistrykey created

If you wish to follow other ways to pull private images see official docs of Kubernetes.

NB: If you are using kubectl 1.9.0, update to 1.9.1 or later to avoid this issue.

Install KubeDB operator

When installing KubeDB operator, set the flags --docker-registry and --image-pull-secret to appropriate value. Follow the steps to install KubeDB operator properly in cluster so that to points to the DOCKER_REGISTRY you wish to pull images from.

Deploy Redis server from Private Registry

While deploying Redis from private repository, you have to add myregistrykey secret in Redis spec.imagePullSecrets. Below is the Redis CRD object we will create.

kind: Redis
  name: redis-pvt-reg
  namespace: demo
  version: 6.2.14
    storageClassName: "standard"
    - ReadWriteOnce
        storage: 1Gi
      - name: myregistrykey

Now run the command to deploy this Redis object:

$ kubectl create -f created

To check if the images pulled successfully from the repository, see if the Redis is in running state:

$ kubectl get pods -n demo -w
NAME              READY     STATUS              RESTARTS   AGE
redis-pvt-reg-0   0/1       Pending             0          0s
redis-pvt-reg-0   0/1       Pending             0          0s
redis-pvt-reg-0   0/1       ContainerCreating   0          0s
redis-pvt-reg-0   1/1       Running             0          2m

$ kubectl get rd -n demo
redis-pvt-reg   6.2.14    Running   40s

Cleaning up

To clean up the Kubernetes resources created by this tutorial, run:

kubectl patch -n demo rd/redis-pvt-reg -p '{"spec":{"terminationPolicy":"WipeOut"}}' --type="merge"
kubectl delete -n demo rd/redis-pvt-reg

kubectl patch -n demo drmn/redis-pvt-reg -p '{"spec":{"wipeOut":true}}' --type="merge"
kubectl delete -n demo drmn/redis-pvt-reg

kubectl delete ns demo
$ kubectl patch -n demo rd/redis-pvt-reg -p '{"spec":{"terminationPolicy":"WipeOut"}}' --type="merge" patched

$ kubectl delete -n demo rd/redis-pvt-reg "redis-pvt-reg" deleted

$ kubectl delete -n demo secret myregistrykey
secret "myregistrykey" deleted

$ kubectl delete ns demo
namespace "demo" deleted

Next Steps