CKA 예제 리마인더 - 31. Ingress Networking - 1

배포된 ingress resource의 이름은 무엇인가요?

controlplane ~ ➜  kubectl get ingress -A
NAMESPACE   NAME                 CLASS    HOSTS   ADDRESS         PORTS   AGE
app-space   ingress-wear-watch   <none>   *       172.20.49.254   80      16m



ingress resource의 host는 무엇으로 설정되어 있나요?

HOSTS는 *이므로 All hosts



/wear path에 설정된 backend는 어떤 것인가요?

controlplane ~ ✖ kubectl describe ingress ingress-wear-watch -n app-space
Name:             ingress-wear-watch
Labels:           <none>
Namespace:        app-space
Address:          172.20.49.254
Ingress Class:    <none>
Default backend:  <default>
Rules:
  Host        Path  Backends
  ----        ----  --------
  *           
              /wear    wear-service:8080 (172.17.0.4:8080)
              /watch   video-service:8080 (172.17.0.5:8080)
Annotations:  nginx.ingress.kubernetes.io/rewrite-target: /
              nginx.ingress.kubernetes.io/ssl-redirect: false
Events:
  Type    Reason  Age                From                      Message
  ----    ------  ----               ----                      -------
  Normal  Sync    20m (x2 over 20m)  nginx-ingress-controller  Scheduled for sync





/stream path를 통해 video service를 접속 가능하게 하세요

Ingress: ingress-wear-watch

Path: /stream

Backend Service: video-service

Backend Service Port: 8080



controlplane ~ ✖ kubectl edit ingress ingress-wear-watch -n app-space

# Please edit the object below. Lines beginning with a '#' will be ignored,
# and an empty file will abort the edit. If an error occurs while saving this file will be
# reopened with the relevant failures.
#
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
  creationTimestamp: "2025-01-07T09:00:20Z"
  generation: 1
  name: ingress-wear-watch
  namespace: app-space
  resourceVersion: "793"
  uid: 1f866776-0aff-471d-bf79-2892d73b9a84
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: wear-service
            port:
              number: 8080
        path: /wear
        pathType: Prefix
      - backend:
          service:
            name: video-service
            port:
              number: 8080
        path: /stream
        pathType: Prefix
status:
  loadBalancer:
    ingress:
    - ip: 172.20.49.254

or

controlplane ~ ➜  kubectl get ingress ingress-wear-watch -n app-space -o yaml > ./ingress.yaml

controlplane ~ ➜  ls
ingress.yaml

controlplane ~ ➜  vim ingress.yaml 

controlplane ~ ➜  kubectl apply -f ingress.yaml --force

manifest를 직접 수정



/eat path에 backend를 할당하세요

Ingress: ingress-wear-watch

Path: /eat

Backend Service: food-service

Backend Service Port: 8080

controlplane ~ ➜  kubectl get svc -n app-space
NAME                      TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
default-backend-service   ClusterIP   172.20.196.54    <none>        80/TCP     48m
food-service              ClusterIP   172.20.167.205   <none>        8080/TCP   2m5s
video-service             ClusterIP   172.20.64.190    <none>        8080/TCP   48m
wear-service              ClusterIP   172.20.178.95    <none>        8080/TCP   48m

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
  creationTimestamp: "2025-01-07T09:00:20Z"
  generation: 1
  name: ingress-wear-watch
  namespace: app-space
  resourceVersion: "793"
  uid: 1f866776-0aff-471d-bf79-2892d73b9a84
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: wear-service
            port:
              number: 8080
        path: /wear
        pathType: Prefix
      - backend:
          service:
            name: video-service
            port:
              number: 8080
        path: /stream
        pathType: Prefix
      - backend:
          service:
            name: food-service
            port:
              number: 8080
        path: /eat
        pathType: Prefix
status:
  loadBalancer:
    ingress:
    - ip: 172.20.49.254

controlplane ~ ➜  kubectl apply -f ingress.yaml --force
ingress.networking.k8s.io/ingress-wear-watch configured





/pay path에 새로운 service를 할당하세요

Ingress Created

Path: /pay

Configure correct backend service

Configure correct backend port



먼저 네임스페이스를 찾고

controlplane ~ ➜  kubectl get deploy -A
NAMESPACE        NAME                       READY   UP-TO-DATE   AVAILABLE   AGE
app-space        default-backend            1/1     1            1           50m
app-space        webapp-food                1/1     1            1           3m55s
app-space        webapp-video               1/1     1            1           50m
app-space        webapp-wear                1/1     1            1           50m
critical-space   webapp-pay                 1/1     1            1           58s
ingress-nginx    ingress-nginx-controller   1/1     1            1           50m
kube-system      coredns                    2/2     2            2           52m



네임스페이스에서 svc의 이름을 찾음

controlplane ~ ➜  kubectl get svc -n critical-space
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
pay-service   ClusterIP   172.20.150.176   <none>        8282/TCP   2m16s



귀찮으니 네임스페이스를 옮기고


controlplane ~ ➜  kubectl config set-context --current --namespace=critical-space
Context "kubernetes-admin@kubernetes" modified.

controlplane ~ ➜  kubectl get svc
NAME          TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)    AGE
pay-service   ClusterIP   172.20.150.176   <none>        8282/TCP   4m49s

controlplane ~ ➜  kubectl get ingress
No resources found in critical-space namespace.


ingress가 없으니 만들어주자


*** 여기서 주의해야할 점은, get svc를 했을 때 PORT가 8080이 아닌 8282로 되어있음

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    nginx.ingress.kubernetes.io/rewrite-target: /
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
  name: ingress-wear-watch
  namespace: critical-space
spec:
  rules:
  - http:
      paths:
      - backend:
          service:
            name: pay-service
            port:
              number: 8282
        path: /pay
        pathType: Prefix

controlplane ~ ➜  kubectl apply -f ingress.yaml --force
ingress.networking.k8s.io/ingress-wear-watch configured