Exercise 5.3: Using ConfigMaps Configure Ambassador Containers

1. PV 생성

   cat <<EOF | kubectl create -f -
   kind: PersistentVolume
   apiVersion: v1
   metadata:
     name: weblog-pv-volume
     labels:
       type: local
   spec:
     capacity:
       storage: 100Mi
     accessModes:
       - ReadWriteOnce
     hostPath:
       path: "/tmp/weblog"
   EOF

2. 생성된 PV 확인

   kubectl get pv weblog-pv-volume

3. PVC 생성

   cat <<EOF | kubectl create -f -
   kind: PersistentVolumeClaim
   apiVersion: v1
   metadata:
     name: weblog-pv-claim
   spec:
     accessModes:
       - ReadWriteOnce
     resources:
       requests:
         storage: 100Mi
   EOF

4. 생성된 PVC 확인

   kubectl get pvc weblog-pv-claim

5. Pod 생성

   cat <<EOF | kubectl create -f -
   apiVersion: v1
   kind: Pod
   metadata:
     name: nginx
     labels:
       type: webserver
   spec:
     containers:
     - name: nginx
       image: nginx
       ports:
       - containerPort: 80
       volumeMounts:
       - mountPath: "/var/log/nginx/"
         name: weblog-pv-storage
     - name: fdlogger
       image: fluent/fluentd
       volumeMounts:
       - mountPath: "/var/log"
         name: weblog-pv-storage
     volumes:
     - name: weblog-pv-storage
       persistentVolumeClaim:
         claimName: weblog-pv-claim
   EOF

6. Pod가 생성된 노드 확인

   kubectl get pod nginx -o wide

7. Pod 생성된 노드에 접속해서 hostPath에 명시한 디렉토리가 생성됐는지 확인

   ls -al /tmp/weblog/

8. CP 노드로 이동

9. CURL 명령어를 통해서 생성된 Pod의 IP주소로 HTTP 요청

   for i in {1..5}
   do
   curl -sI $(kubectl get pod nginx -o=jsonpath='{.status.podIP}')
   done

10. Pod 접속해서 로그파일 확인

    {
        kubectl exec nginx -it -c nginx -- ls -al /var/log/nginx
        kubectl exec nginx -it -c nginx -- cat /var/log/nginx/access.log
    }

11. Pod 생성된 노드에 접속해서 로그파일 확인

    cat /tmp/weblog/access.log

12. CP 노드로 이동

13. Fluentd 컨테이너 로그 확인

    kubectl logs nginx -c fdlogger

14. ConfigMap 생성

    cat <<EOF | kubectl create -f -
    apiVersion: v1
    kind: ConfigMap
    metadata:
      name: fluentd-config
    data:
      fluentd.conf: |
        <source>
          @type tail
          format none
          path /var/log/access.log
          tag count.format1
        </source>
    
        <match *.**>
        @type stdout
        id stdout_output
        </match>
    EOF

15. Pod 삭제

    kubectl delete pod nginx

16. Pod 생성

    cat <<EOF | kubectl create -f -
    apiVersion: v1
    kind: Pod
    metadata:
      name: nginx
      labels:
        type: webserver
    spec:
      containers:
      - name: nginx
        image: nginx
        ports:
        - containerPort: 80
        volumeMounts:
        - mountPath: "/var/log/nginx/"
          name: weblog-pv-storage
      - name: fdlogger
        image: fluent/fluentd
        env:
        - name: FLUENTD_OPT
          value: -c /etc/fluentd-config/fluentd.conf
        volumeMounts:
        - mountPath: "/var/log"
          name: weblog-pv-storage
        - name: log-config
          mountPath: "/etc/fluentd-config"
      volumes:
      - name: weblog-pv-storage
        persistentVolumeClaim:
          claimName: weblog-pv-claim
      - name: log-config
        configMap:
          name: fluentd-config
    EOF

17. CURL 명령어를 통해서 생성된 Pod의 IP주소로 HTTP 요청

    for i in {1..5}
    do
    curl -sI $(kubectl get pod nginx -o=jsonpath='{.status.podIP}')
    done

18. Fluentd 컨테이너 로그 확인

    kubectl logs nginx -c fdlogger

19. 리소스 삭제

    {
        kubectl delete pod nginx
        kubectl delete cm fluentd-config
        kubectl delete pvc weblog-pv-claim
        kubectl delete pv weblog-pv-volume
    }