nginx-statefulset.md

Creating an Nginx StatefulSet and Service

Instructions

1. Write a YAML file called "nginx-webapp.yaml" with both a service and a stateful set defined within the same file

2. For the service, implement:

   a.) the name of the service resource is "nginx-service" and has a label "app: nginx"

   b.) specify the port to 80 and give the port a name of "nginx-web"

   c.) specify a selector called "app:nginx"

3. For the statefulset, implement:

   a.) the name of the statefulset resource is "web-app"

   b.) the service name is set to "nginx-service"

   c.) there are 6 replicas

   d.) a matchLabels selector set to "app:nginx"

   e.) a container template given the label "app: nginx"

   f.) container is given a name "nginx" and pulls the image "k8s.gcr.io/nginx-slim:0.8"

   g.) container port 80 is open and given a name "nginx-web"

4. In another terminal window, watch the creation of the StatefulSet Pods oc get pods -w -l app=nginx

5. Verify the statefulset and service were created

6. Describe the service created and notice the amount of endpoints

7. Curl one of the endpoints to verify a successful connection to the pods

Solution

1,2,3.

apiVersion: v1
kind: Service
metadata:
  name: nginx
  labels:
    app: nginx
spec:
  ports:
  - port: 80
    name: web
  clusterIP: None
  selector:
    app: nginx
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: web
spec:
  serviceName: "nginx"
  replicas: 2
  selector:
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: k8s.gcr.io/nginx-slim:0.8
        ports:
        - containerPort: 80
          name: web

4. oc get pods -w -l app=nginx
5. oc get statefulset oc get service
6. oc describe service/<service-name>
7. curl <endpoint>