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Using private Docker registry
KubeDB supports using private Docker registry. This tutorial will show you how to run KubeDB managed PostgreSQL database using private Docker images.
Before You Begin
At first, 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.
$ kubectl create ns demo
namespace/demo created
Note: YAML files used in this tutorial are stored in docs/examples/postgres folder in GitHub repository kubedb/docs.
Prepare Private Docker Registry
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 postgres, push
DB_IMAGE
,TOOLS_IMAGE
,EXPORTER_IMAGE
of following PostgresVersions, wheredeprecated
is not true, to your private registry.$ kubectl get postgresversions -n kube-system -o=custom-columns=NAME:.metadata.name,VERSION:.spec.version,DB_IMAGE:.spec.db.image,TOOLS_IMAGE:.spec.tools.image,EXPORTER_IMAGE:.spec.exporter.image,DEPRECATED:.spec.deprecated NAME VERSION DB_IMAGE TOOLS_IMAGE EXPORTER_IMAGE DEPRECATED 10.2 10.2 kubedb/postgres:10.2 kubedb/postgres-tools:10.2 kubedb/operator:0.8.0 true 10.2-v1 10.2 kubedb/postgres:10.2-v2 kubedb/postgres-tools:10.2-v2 kubedb/postgres_exporter:v0.4.6 true 10.2-v2 10.2 kubedb/postgres:10.2-v3 kubedb/postgres-tools:10.2-v3 kubedb/postgres_exporter:v0.4.7 <none> 10.2-v3 10.2 kubedb/postgres:10.2-v4 kubedb/postgres-tools:10.2-v3 kubedb/postgres_exporter:v0.4.7 <none> 10.2-v4 10.2 kubedb/postgres:10.2-v5 kubedb/postgres-tools:10.2-v3 kubedb/postgres_exporter:v0.4.7 <none> 10.2-v5 10.2 kubedb/postgres:10.2-v6 kubedb/postgres-tools:10.2-v3 kubedb/postgres_exporter:v0.4.7 <none> 10.6 10.6 kubedb/postgres:10.6 kubedb/postgres-tools:10.6 kubedb/postgres_exporter:v0.4.7 <none> 10.6-v1 10.6 kubedb/postgres:10.6-v1 kubedb/postgres-tools:10.6 kubedb/postgres_exporter:v0.4.7 <none> 10.6-v2 10.6 kubedb/postgres:10.6-v2 kubedb/postgres-tools:10.6 kubedb/postgres_exporter:v0.4.7 <none> 10.6-v3 10.6 kubedb/postgres:10.6-v3 kubedb/postgres-tools:10.6 kubedb/postgres_exporter:v0.4.7 <none> 11.1 11.1 kubedb/postgres:11.1 kubedb/postgres-tools:11.1 kubedb/postgres_exporter:v0.4.7 <none> 11.1-v1 11.1 kubedb/postgres:11.1-v1 kubedb/postgres-tools:11.1 kubedb/postgres_exporter:v0.4.7 <none> 11.1-v2 11.1 kubedb/postgres:11.1-v2 kubedb/postgres-tools:11.1 kubedb/postgres_exporter:v0.4.7 <none> 11.1-v3 11.1 kubedb/postgres:11.1-v3 kubedb/postgres-tools:11.1 kubedb/postgres_exporter:v0.4.7 <none> 11.2 11.2 kubedb/postgres:11.2 kubedb/postgres-tools:11.2 kubedb/postgres_exporter:v0.4.7 <none> 11.2-v1 11.2 kubedb/postgres:11.2-v1 kubedb/postgres-tools:11.2 kubedb/postgres_exporter:v0.4.7 <none> 9.6 9.6 kubedb/postgres:9.6 kubedb/postgres-tools:9.6 kubedb/operator:0.8.0 true 9.6-v1 9.6 kubedb/postgres:9.6-v2 kubedb/postgres-tools:9.6-v2 kubedb/postgres_exporter:v0.4.6 true 9.6-v2 9.6 kubedb/postgres:9.6-v3 kubedb/postgres-tools:9.6-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6-v3 9.6 kubedb/postgres:9.6-v4 kubedb/postgres-tools:9.6-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6-v4 9.6 kubedb/postgres:9.6-v5 kubedb/postgres-tools:9.6-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6-v5 9.6 kubedb/postgres:9.6-v6 kubedb/postgres-tools:9.6-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6.7 9.6.7 kubedb/postgres:9.6.7 kubedb/postgres-tools:9.6.7 kubedb/operator:0.8.0 true 9.6.7-v1 9.6.7 kubedb/postgres:9.6.7-v2 kubedb/postgres-tools:9.6.7-v2 kubedb/postgres_exporter:v0.4.6 true 9.6.7-v2 9.6.7 kubedb/postgres:9.6.7-v3 kubedb/postgres-tools:9.6.7-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6.7-v3 9.6.7 kubedb/postgres:9.6.7-v4 kubedb/postgres-tools:9.6.7-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6.7-v4 9.6.7 kubedb/postgres:9.6.7-v5 kubedb/postgres-tools:9.6.7-v3 kubedb/postgres_exporter:v0.4.7 <none> 9.6.7-v5 9.6.7 kubedb/postgres:9.6.7-v6 kubedb/postgres-tools:9.6.7-v3 kubedb/postgres_exporter:v0.4.7 <none>
Docker hub repositories:
Create ImagePullSecret
ImagePullSecrets is a type of a 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 generic -n demo docker-registry myregistrykey \
--docker-server=DOCKER_REGISTRY_SERVER \
--docker-username=DOCKER_USER \
--docker-email=DOCKER_EMAIL \
--docker-password=DOCKER_PASSWORD
secret/myregistrykey created
If you wish to follow other ways to pull private images see official docs of Kubernetes.
Note; 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.
Create PostgresVersion CRD
KubeDB uses images specified in PostgresVersion crd for database, backup and exporting prometheus metrics. You have to create a PostgresVersion crd specifying images from your private registry. Then, you have to point this PostgresVersion crd in spec.version
field of Postgres object. For more details about PostgresVersion crd, please visit here.
Here, is an example of PostgresVersion crd. Replace <YOUR_PRIVATE_REGISTRY>
with your private registry.
apiVersion: catalog.kubedb.com/v1alpha1
kind: PostgresVersion
metadata:
name: "13.13"
spec:
coordinator:
image: PRIVATE_REGISTRY/pg-coordinator:v0.1.0
db:
image: PRIVATE_REGISTRY/postgres:13.2-alpine
distribution: PostgreSQL
exporter:
image: PRIVATE_REGISTRY/postgres-exporter:v0.9.0
initContainer:
image: PRIVATE_REGISTRY/postgres-init:0.1.0
podSecurityPolicies:
databasePolicyName: postgres-db
stash:
addon:
backupTask:
name: postgres-backup-13.1
restoreTask:
name: postgres-restore-13.1
version: "13.13"
Now, create the PostgresVersion crd,
$ kubectl apply -f pvt-postgresversion.yaml
postgresversion.kubedb.com/pvt-10.2 created
Deploy PostgreSQL database from Private Registry
While deploying PostgreSQL from private repository, you have to add myregistrykey
secret in Postgres spec.podTemplate.spec.imagePullSecrets
and specify pvt-10.2
in spec.version
field.
Below is the Postgres object we will create in this tutorial
apiVersion: kubedb.com/v1
kind: Postgres
metadata:
name: pvt-reg-postgres
namespace: demo
spec:
version: "13.13"
storage:
storageClassName: "standard"
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
podTemplate:
spec:
imagePullSecrets:
- name: myregistrykey
Now run the command to create this Postgres object:
$ kubectl create -f https://github.com/kubedb/docs/raw/v2024.11.18/docs/examples/postgres/private-registry/pvt-reg-postgres.yaml
postgres.kubedb.com/pvt-reg-postgres created
To check if the images pulled successfully from the repository, see if the PostgreSQL is in Running state:
$ kubectl get pods -n demo --selector="app.kubernetes.io/instance=pvt-reg-postgres"
NAME READY STATUS RESTARTS AGE
pvt-reg-postgres-0 1/1 Running 0 3m
Snapshot
You can specify imagePullSecret
for Snapshot objects in spec.podTemplate.spec.imagePullSecrets
field of Snapshot object. If you are using scheduled backup, you can also provide imagePullSecret
in backupSchedule.podTemplate.spec.imagePullSecrets
field of Postgres crd. KubeDB also reuses imagePullSecret
for Snapshot object from spec.podTemplate.spec.imagePullSecrets
field of Postgres crd.
Cleaning up
To cleanup the Kubernetes resources created by this tutorial, run:
kubectl patch -n demo pg/pvt-reg-postgres -p '{"spec":{"deletionPolicy":"WipeOut"}}' --type="merge"
kubectl delete -n demo pg/pvt-reg-postgres
kubectl delete ns demo
If you would like to uninstall KubeDB operator, please follow the steps here.
Next Steps
- Learn about backup and restore PostgreSQL database using Stash.
- Learn about initializing PostgreSQL with Script.
- Want to setup PostgreSQL cluster? Check how to configure Highly Available PostgreSQL Cluster
- Monitor your PostgreSQL database with KubeDB using built-in Prometheus.
- Monitor your PostgreSQL database with KubeDB using Prometheus operator.
- Want to hack on KubeDB? Check our contribution guidelines.