Service 개요
트래픽 분산을 위해 Pod를 여러개로 구성할때, EndPoint를 제공하여 IP주소의 변동 및 로드밸런싱을 가능하게 해줍니다.
www.boanproject.com
Service Type
ClusterIP (default)
- 외부에서접속이 불가하며 Cluster내부에서만 접근 가능한 서비스타입
NodePort
- NodePort를 통해 외부네트워크에서 접속가능한 서비스타입
- 30000-32767 범위의 포트가 자동 할당되며, 포트를 직접 명시 할 수 있습니다.
- 운영환경에서는 사용하기에 적절하지 않음
LoadBalancer
- LB를 통해 PublicIP를 할당 받아 Public Endpoint를 제공합니다.
- 클라우드의 환경의 경우 클라우드 LB를 사용합니다.
- On-premise구축시에는 LB가 없으며, 3rdParty LB의 도움을 받아야 합니다.
Service Manifest
Service 실습
ClusterIP (default)
ClusterIP
|
NodePort
Single Pod on Single Node |
|
Multi Pod on Single Node |
|
Multi Pod on Multi Node |
|
nginx-svc-nodeport.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp-svc
type: front-end
name: nginx-svc-nodeport
spec:
type: NodePort
ports:
- port: 80
protocol: TCP
targetPort: 80
nodePort: 30008
selector:
type: front-end
sansae@sansaeAir15m2 k8s-lab-workspace % k apply -f nginx-svc-nodeport.yaml service/nginx-svc-nodeport created sansae@sansaeAir15m2 k8s-lab-workspace % k get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 29h nginx-svc ClusterIP 10.0.133.111 <none> 80/TCP 5h38m nginx-svc-nodeport NodePort 10.0.159.138 <none> 80:30008/TCP 3s sansae@sansaeAir15m2 k8s-lab-workspace % k get node -o wide NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME aks-agentpool-33019784-vmss000000 Ready agent 29h v1.27.9 10.224.0.4 <none> Ubuntu 22.04.4 LTS 5.15.0-1056-azure containerd://1.7.7-1 sansae@sansaeAir15m2 k8s-lab-workspace % sansae@sansaeAir15m2 k8s-lab-workspace % sansae@sansaeAir15m2 k8s-lab-workspace % k exec -it util -- bash root@util:/# curl 10.224.0.4:30008 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> ~~~~~~~~~ 생략 ~~~~~~~~ root@util:/# root@util:/# curl 10.0.159.138 <!DOCTYPE html> <html> <head> <title>Welcome to nginx!</title> ~~~~~~~~~ 생략 ~~~~~~~~ root@util:/#
LoadBalancer
nginx-svc-lb.yaml
apiVersion: v1
kind: Service
metadata:
labels:
app: myapp-svc
type: front-end
name: nginx-svc-lb
spec:
type: LoadBalancer
ports:
- port: 80
protocol: TCP
targetPort: 80
selector:
type: front-end
sansae@sansaeAir15m2 k8s-lab-workspace % k apply -f nginx-svc-lb.yaml service/nginx-svc-lb created sansae@sansaeAir15m2 k8s-lab-workspace % k get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 29h nginx-svc ClusterIP 10.0.133.111 <none> 80/TCP 5h50m nginx-svc-lb LoadBalancer 10.0.69.70 <pending> 80:32050/TCP 5s nginx-svc-nodeport NodePort 10.0.159.138 <none> 80:30008/TCP 11m sansae@sansaeAir15m2 k8s-lab-workspace % k get svc NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE kubernetes ClusterIP 10.0.0.1 <none> 443/TCP 29h nginx-svc ClusterIP 10.0.133.111 <none> 80/TCP 5h50m nginx-svc-lb LoadBalancer 10.0.69.70 20.249.176.154 80:32050/TCP 18s nginx-svc-nodeport NodePort 10.0.159.138 <none> 80:30008/TCP 11m sansae@sansaeAir15m2 k8s-lab-workspace %
LoadBalancer Type의 Service가 생성한 EXTERNAL-IP로 호출 확인
Azure Cloud Native LoadBalancer확인
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