Chapter 7: Updating and Scaling an Application in Kubernetes

Activity 8: Enabling Autoscaling and Performing a Rolling Update

Solution:

Perform the following steps to complete this activity:

1. Create a deployment definition file that uses the suakbas/lesson07:v1 image and has the RollingUpdate strategy type set; this application does a CPU-intensive operation:

   apiVersion: apps/v1
   kind: Deployment
   metadata:
     name: lesson07-deployment
   spec:
     replicas: 1
     strategy:
       type: RollingUpdate
     selector:
       matchLabels:
         app: lesson07
     template:
       metadata:
         labels:
           app: lesson07
       spec:
         containers:
         - image: suakbas/lesson07:v1
           imagePullPolicy: Always
           name: lesson07
           resources:
             requests:
               memory: "500m"
               cpu: "250m"

2. Deploy the deployment and check whether the pod is running:

   $ kubectl apply -f deployment.yaml -n lesson-7
   $ kubectl get pods -n lesson-7

   Figure 7.21...