目錄
- 部署 deploy
- 部署 service
- 查看 service 和 pod 的關系
- 查看 service
- 查看端口
- 導出 yaml
- 篩選 service 關聯 pod
- 擴容測試
- Service 三種常用類型
Service 引入主要是解決 Pod 的動態變化，提供統一訪問入口：
- 防止 Pod 失聯，準備找到提供同一個服務的 Pod （服務發現）
- 定義一組 Pod 的訪問策略 （負載均衡）
部署 deploy
kubectl apply -f deploy.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: chiyi-nginx
spec:
replicas: 3
selector:
matchLabels:
app: chiyi-nginx
template:
metadata:
labels:
app: chiyi-nginx
spec:
containers:
- name: nginx
image: nginx:1.14.2
ports:
- containerPort: 80
部署 service
kubectl apply -f service.yaml
apiVersion: v1
kind: Service
metadata:
name: chiyi-nginx
spec:
selector:
app: chiyi-nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
nodePort: 30002
type: NodePort
查看 service 和 pod 的關系
kubectl get ep curl 10.244.1.58:80
說明：
Service 通過標簽關聯一組 Pod
Service 為一組 Pod 提供負載均衡能力
[root@k8s-master service]# kubectl get ep
NAME ENDPOINTS AGE
chiyi-nginx 10.244.1.58:80,10.244.1.59:80,10.244.2.46:80 5m19s
kubernetes 172.17.28.225:6443 23h
[root@k8s-master service]# curl 10.244.1.58:80
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
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 >nginx.org</a>.<br/>
Commercial support is available at
<a >nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
查看 service
kubectl get service curl 10.101.104.218
[root@k8s-master service]# kubectl get service
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
chiyi-nginx NodePort 10.101.104.218 <none> 80:30002/TCP 6m3s
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 23h
[root@k8s-master service]# curl 10.101.104.218
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
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 >nginx.org</a>.<br/>
Commercial support is available at
<a >nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>
查看端口
ss -antp |grep 30002
[root@k8s-master service]# ss -antp |grep 30002
LISTEN 0 128 *:30002 *:* users:(("kube-proxy",pid=3544,fd=13))
導出 yaml
kubectl get service chiyi-nginx -o yaml
篩選 service 關聯 pod
kubectl get pods -l app=chiyi-nginx
[root@k8s-master service]# kubectl get pods -l app=chiyi-nginx NAME READY STATUS RESTARTS AGE chiyi-nginx-5bbf8bff4b-6bwfz 1/1 Running 0 3m58s chiyi-nginx-5bbf8bff4b-bpvvc 1/1 Running 0 3m58s chiyi-nginx-5bbf8bff4b-pwwt4 1/1 Running 0 3m58s
擴容測試
kubectl scale deployment chiyi-nginx --replicas=1 kubectl get service,pods,ep
Service 三種常用類型
- ClusterIP 集群內部使用,任一節點服務器和 pod 內部都可以訪問
- NodePort 對外暴露應用（端口默認范圍：30000-32767），任一節點服務器公網IP+端口號，可在瀏覽器訪問。
- LoadBalancer 對外暴露應用，適合公有云
