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[쿠버네티스] ClusterIP, NodePort, LoadBalancer 실습

sikaro 2024. 5. 30. 16:47
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ClusterIP

 

실습 디렉토리 이동
cd ~/k8s/lab6-clusterip
1. Service 조회
kubectl get service
kubectl get svc

 

kubernetes   ClusterIP            <none>        443/TCP   23h

root@k8s-master:~/k8s/lab6-clusterip# kubectl get svc
NAME         TYPE        CLUSTER-IP   EXTERNAL-IP   PORT(S)   AGE
kubernetes   ClusterIP               <none>        443/TCP   23h

 


2. yaml 확인
cat pod.yaml
cat svc-clusterip.yaml

 

apiVersion: v1
kind: Pod
metadata:
  name: lab6-pod1
  labels:
    app: svc
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80
    
    
apiVersion: v1
kind: Service
metadata:
  name: lab6-svc
spec:
  selector:
    app: svc
  ports:
  - port: 9090
    targetPort: 80
  type: ClusterIP


3. yaml 을 활용한 ClusterIP 유형의 Service및 pod 생성
kubectl create -f svc-clusterip.yaml
kubectl create -f pod.yaml


4. 위 3에서 만든 리소스 확인
kubectl get pod
kubectl get svc

 

lab6-pod1   1/1     Running   0          5s

NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)    AGE
kubernetes   ClusterIP               <none>        443/TCP    23h
lab6-svc     ClusterIP               <none>        9090/TCP   32s

 

5. curl 명령을 통한 통신 확인
curl <lab6-svc의 ClusterIP>:9090

4에서 확인한 IP를 입력합니다.

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>



6. 리소스 삭제
kubectl delete pod,svc --all

pod "lab6-pod1" deleted
service "kubernetes" deleted
service "lab6-svc" deleted

 

 

NodePort Service

실습 디렉토리 이동
cd ~/k8s/lab7-nodeport
1. yaml 확인
cat pod.yaml
cat svc-nodeport.yaml

apiVersion: v1
kind: Pod
metadata:
  name: lab6-pod2
  labels:
    app: svc
spec:
  containers:
  - name: nginx
    image: nginx
    ports:
    - containerPort: 80

apiVersion: v1
kind: Service
metadata:
  name: lab7-svc
spec:
  selector:
    app: svc
  ports:
  - port: 9090
    targetPort: 80
    nodePort: 30000
  type: NodePort


2. yaml 을 활용한 NodePort 유형의 Service및 pod 생성
kubectl create -f svc-nodeport.yaml
kubectl create -f pod.yaml

 

 


3. 생성된 Service 확인
kubectl get svc

 

NAME         TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP   		    <none>        443/TCP          2m21s
lab7-svc     NodePort    		    <none>        9090:30000/TCP   9s


4. Worker1 로의 접근을 통해 통신 확인
curl <Worker 1 노드의 IP>:30000

 

5. Worker2 로의 접근을 통해 통신 확인
curl <Worker 2 노드의 IP>:30000

<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
html { color-scheme: light dark; }
body { width: 35em; margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif; }
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>

<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>

<p><em>Thank you for using nginx.</em></p>
</body>
</html>

 

6. 리소스 삭제
kubectl delete pod,svc --all

 

Loadbalancer Service

실습 디렉토리 이동
cd ~/k8s/lab8-loadbalancer


1. yaml 확인
cat pod.yaml
cat svc-loadbalancer.yaml


2. yaml 을 활용한 Loadbalancer 유형의 Service및 pod 생성
kubectl create -f svc-loadbalancer.yaml
kubectl create -f pod.yaml

 


3. 생성한 Service 확인
kubectl get svc
ExternalIP 를 발급받지 못하는 Pending 상태 확인

 

NAME         TYPE           CLUSTER-IP     EXTERNAL-IP   PORT(S)          AGE
kubernetes   ClusterIP       	   	    <none>        443/TCP          4m58s
lab8-svc     LoadBalancer    	 	   <pending>     9090:32263/TCP   9s

 


4. Loadbalancer 타입의 서비스가 생성한 ClusterIP 를 활용하여 내부에서 접근 시도
curl <Loadbalancer 타입의 서비스의 ClusterIP>:9090

 

html 출력 확인


5. Loadbalancer 타입의 서비스가 생성한 NodePort 를 활용하여 외부에서 접근 시도

curl <아무 Worker IP>:<Loadbalancer 타입의 서비스의 NodePort>

 

예시 : workerIP:3만대 포트

 

 

 

 

 

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