kubernetesstatefulsetexample's Introduction

Kubernetes StatefulSet Example

An example of a Kubernetes StatefulSet

Mounting persistent volumes on minikube

minikube mount www1:/tmp/www1 &
minikube mount www2:/tmp/www2 &

Creating persistent volumes

kubectl apply -f www-volume1.yaml
kubectl apply -f www-volume2.yaml

Deploying a StatefulSet

kubectl apply -f statefulset.yaml

Deploy a sleep container for testing

kubectl apply -f https://raw.githubusercontent.com/istio/istio/master/samples/sleep/sleep.yaml

Send Requests to the both nginx services

$ kubectl exec -it $(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=sleep) -c sleep -- curl web-0.nginx

Hello from Kubernetes storage 1

$ kubectl exec -it $(kubectl get pods -o jsonpath='{.items[*].metadata.name}' -l app=sleep) -c sleep -- curl web-1.nginx

Hello from Kubernetes storage 2

Additional queries

Check pods

$ kubectl get pods
NAME                     READY     STATUS    RESTARTS   AGE
sleep-6bc775c9c5-9hrdn   1/1       Running   0          6h
web-0                    1/1       Running   0          2m
web-1                    1/1       Running   0          2m

Check stateful sets

$ kubectl get statefulset
NAME      DESIRED   CURRENT   AGE
web       2         2         4m

Check persistent volumes

$ kubectl get persistentvolume
NAME          CAPACITY   ACCESSMODES   RECLAIMPOLICY   STATUS    CLAIM               STORAGECLASS       REASON    AGE
www-volume1   10Mi       RWO           Retain          Bound     default/www-web-0   my-storage-class             41s
www-volume2   10Mi       RWO           Retain          Bound     default/www-web-1   my-storage-class             34s

Check persistent volume claims

$ kubectl get persistentvolumeclaim
NAME        STATUS    VOLUME        CAPACITY   ACCESSMODES   STORAGECLASS       AGE
www-web-0   Bound     www-volume1   10Mi       RWO           my-storage-class   2m
www-web-1   Bound     www-volume2   10Mi       RWO           my-storage-class   2m

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