task-02.md

Pod

빠른 예제

kubectl run whoami --image subicura/whoami:1 # deprecated soon..
kubectl get po
kubectl get pod
kubectl get pods
kubectl get pods -o wide
kubectl get pods -o yaml
kubectl get pods -o json
kubectl logs whoami-<xxxx>
kubectl logs -f whoami-<xxxx>
kubectl exec -it whoami-<xxxx> sh
kubectl describe pods whoami-<xxxx>
kubectl delete pods whoami-<xxxx>
kubectl get pods
kubectl get all
kubectl delete deployment/whoami

YAML 파일 예제

kubectl apply -f <filename>
kubectl delete -f <filename>

기본 예제

guide-03/task-02/whoami-pod.yml

apiVersion: v1
kind: Pod
metadata:
  name: whoami
  labels:
    type: app
spec:
  containers:
  - name: app
    image: subicura/whoami:1

Pod Ready

livenessProbe 예제 (살아 있는지 조사)

guide-03/task-02/whoami-pod-lp.yml

apiVersion: v1
kind: Pod
metadata:
  name: whoami-lp
  labels:
    type: app
spec:
  containers:
  - name: app
    image: subicura/whoami:1
    livenessProbe:
      httpGet:
        path: /not/exist
        port: 8080
      initialDelaySeconds: 5
      timeoutSeconds: 2 # Default 1
      periodSeconds: 5 # Defaults 10
      failureThreshold: 1 # Defaults 3

readinessProbe 예제 (준비가 되었는지 조사)

guide-03/task-02/whoami-pod-rp.yml

apiVersion: v1
kind: Pod
metadata:
  name: whoami-rp
  labels:
    type: app
spec:
  containers:
  - name: app
    image: subicura/whoami:1
    readinessProbe:
      httpGet:
        path: /not/exist
        port: 8080
      initialDelaySeconds: 5
      timeoutSeconds: 2 # Default 1
      periodSeconds: 5 # Defaults 10
      failureThreshold: 1 # Defaults 3

health check 예제

guide-03/task-02/whoami-pod-health.yml

apiVersion: v1
kind: Pod
metadata:
  name: whoami-health
  labels:
    type: app
spec:
  containers:
  - name: app
    image: subicura/whoami:1
    livenessProbe:
      httpGet:
        path: /
        port: 4567
    readinessProbe:
      httpGet:
        path: /
        port: 4567

multi container 예제

guide-03/task-02/whoami-pod-redis.yml

apiVersion: v1
kind: Pod
metadata:
  name: whoami-redis
  labels:
    type: stack
spec:
  containers:
  - name: app
    image: subicura/whoami-redis:1
    env:
    - name: REDIS_HOST
      value: "localhost"
  - name: db
    image: redis

kubectl get all
kubectl logs whoami-redis
kubectl logs whoami-redis app
kubectl logs whoami-redis db
kubectl exec -it whoami-redis
kubectl exec -it whoami-redis -c db sh
kubectl exec -it whoami-redis -c app sh
  apk add curl busybox-extras # install telnet
  curl localhost:4567
  telnet localhost 6379
    dbsize
    KEYS *
    GET count
    quit
kubectl get pod/whoami-redis
kubectl get pod/whoami-redis -o yaml
kubectl get pod/whoami-redis -o jsonpath="{.spec.containers[0].name}"
kubectl get pod/whoami-redis -o jsonpath="{.spec.containers[*].name}"
kubectl describe pod/whoami-redis

Exam 1. 다음 조건을 만족하는 pod을 만들어 보세요.

guide-03/task-02/exam-1.yml

• Name: mongodb
• Labels: app => mongo
• Container Name: mongodb
• Image: mongo:4

Exam 2. 다음 조건을 만족하는 pod을 만들어 보세요.

guide-03/task-02/exam-2.yml

• Name: mysql
• Labels: app => mysql
• Container Name: mysql
• Image: mysql:5.6
• Env
  • MYSQL_ROOT_PASSWORD: 123456

POD에 접속해서 mysql -uroot -p123456 으로 테스트

정리

kubectl delete -f ./