statefulset-k8s-example

Deploy SSD disk on K8s

kubectl apply -f google_cloud-ssd.yaml

storageclass.storage.k8s.io/fast-disk created

Deploy mongo statefulset

kubectl apply -f mongo-statefulset.yaml

kubectl get pods

To scale statefulset:

kubectl scale --replicas=4 statefulset mongo

Delete mongodb services

Use kubectl delete to delete the services

kubectl delete statefulset mongo

kubectl delete svc mongo

kubectl delete pvc -l role=mongo

References

1. https://github.com/cvallance/mongo-k8s-sidecar
2. Running a MongoDB Database in Kubernetes with StatefulSets

Troubleshoot

$ kubectl apply -f mongo-statefulset.yaml

error: error validating "mongo-statefulset.yaml": error validating data: ValidationError(StatefulSet.spec.volumeClaimTemplates[0]): unknown field "annotations" in io.k8s.api.core.v1.PersistentVolumeClaim; if you choose to ignore these errors, turn validation off with --validate=false

reason: check for the syntax error

$ kubectl apply -f mongo-statefulset.yaml

Forbidden: updates to statefulset spec for fields other than 'replicas', 'template', and 'updateStrategy' are forbidden