Solutions

This section contains the worked-out answers for the activities present in each lesson. Note that in case of descriptive questions, your answers might not match the ones provided in this section completely. As long as the essence of the answers remain the same, you can consider them correct.

Chapter 1: Kubernetes Design Patterns

Following are the activity solutions for this chapter.

Activity: Running a Web Server with Synchronization

In the sidecar.yaml file, pod definition with two containers, namely server and sync, is provided. In the server container, httpd serves the source volume on port 80. In the sync container, git runs with every 30 seconds to synchronize the source volume. These two containers work independently; however, they are sharing the source volume to achieve file synchronization:

apiVersion: v1
kind: Pod
metadata:
       name: sidecar
spec:
     containers:
...
volumes:
- emptyDir: {}
    name: source 

Follow these steps to get the solution:

1. Create the pod with the following command:
   

 kubectl apply...

Chapter 2: Kubernetes Client Libraries

Following are the activity solutions for this chapter.

Activity: Using the Kubernetes Go Client inside the Cluster

1. Create a deployment with the Docker image of the example client from the previous exercise:
   

kubectl run go-client --image=onuryilmaz/k8s-clientexample:go

2. Wait until the pod is running by using the following command:
   

kubectl get pods -w

3. Get the logs of the deployment pod with the following command:
   

kubectl logs $(kubectl get pods --selector run=go-client -o jsonpath="{.items[0].metadata.name}")