Exercise 4.6: Simple initContainer

1. Pod 생성

   cat <<EOF | kubectl apply -f -
   apiVersion: v1
   kind: Pod
   metadata:
     name: init-tester
   spec:
     containers:
     - name: webservice
       image: nginx
     initContainers:
     - name: failed
       image: busybox
       command: [/bin/false]
   EOF

2. Pod 상태 추적

   kubectl get pod init-tester -w

3. Ctrl+C 입력

4. Pod 상세내용 확인

   kubectl describe pod init-tester

5. Pod 삭제

   kubectl delete pod init-tester

6. Pod 생성

   cat <<EOF | kubectl apply -f -
   apiVersion: v1
   kind: Pod
   metadata:
     name: nginx-init
   spec:
     containers:
     - name: nginx
       image: nginx
       ports:
       - containerPort: 80
       volumeMounts:
       - name: html
         mountPath: /usr/share/nginx/html
     initContainers:
     - name: index
       image: curlimages/curl
       command:
         - "sh"
         - "-c"
         - "echo Welcome to LFD459 > /data/index.html"
       volumeMounts:
       - name: html
         mountPath: /data
     volumes:
     - name: html
       emptyDir: {}
   EOF

7. Pod 상태 확인

   kubectl get pod nginx-init

8. Pod 상세내용 확인

   kubectl describe pod nginx-init

9. CURL 명령어를 통해서 생성된 Pod의 IP주소로 HTTP 요청

   curl $(kubectl get pod nginx-init -o=jsonpath='{.status.podIP}')

10. Pod 삭제

    kubectl delete pod nginx-init