使用nginx对k8s集群中的service做负载均衡

• 环境准备

• 资源清单文件

[root@master manifest]# cat test.yml 
---
apiVersion: apps/v1
kind: Deployment 
metadata: 
  name: web
  namespace: default 
spec:
  replicas: 2
  selector: 
    matchLabels:
      app: nginx
  template:
    metadata:
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        imagePullPolicy: IfNotPresent
        volumeMounts:
        - mountPath: /usr/share/nginx/html
          name: nginx-index
      volumes:
      - name: nginx-index
        hostPath:
          path: /var/www/html

---
apiVersion: v1
kind: Service
metadata:
  name: web
  namespace: default
spec:
  ports: 
  - port: 80
    protocol: TCP
    targetPort: 80
    nodePort: 30000
  selector:
    app: nginx
  type: NodePort

//运行pod
[root@master manifest]# kubectl get pods -o wide
NAME                   READY   STATUS    RESTARTS   AGE     IP            NODE                NOMINATED NODE   READINESS GATES
web-579695c7d4-l2j7s   1/1     Running   0          5m17s   10.244.2.58   node2.example.com              
web-579695c7d4-p7mzl   1/1     Running   0          4m19s   10.244.1.25   node1.example.com              

[root@master manifest]# curl 192.168.218.130:30000
hello world
[root@master manifest]# curl 192.168.218.144:30000
hello k8s

• nginx调度器

[root@nginx ~]# yum -y install nginx
[root@nginx ~]# vi /etc/nginx/nginx.conf
......
    upstream webservers {
            server 192.168.218.130:30000;
            server 192.168.218.144:30000;
    }
    server{
        listen 8080;
        location / {
            proxy_pass http://webservers;
        }
    }
......
[root@nginx ~]# systemctl start nginx
State  Recv-Q Send-Q Local Address:Port Peer Address:PortProcess 
LISTEN 0      128          0.0.0.0:80        0.0.0.0:*           
LISTEN 0      128          0.0.0.0:8080      0.0.0.0:*           
LISTEN 0      128          0.0.0.0:22        0.0.0.0:*                   
LISTEN 0      128             [::]:80           [::]:*           
LISTEN 0      128             [::]:22           [::]:*  

[root@nginx ~]# curl 192.168.218.132:8080
hello k8s
[root@nginx ~]# curl 192.168.218.132:8080
hello k8s
[root@nginx ~]# curl 192.168.218.132:8080
hello world
[root@nginx ~]# curl 192.168.218.132:8080
hello k8s
[root@nginx ~]# curl 192.168.218.132:8080
hello k8s
[root@nginx ~]# curl 192.168.218.132:8080
hello k8s
[root@nginx ~]# curl 192.168.218.132:8080
hello world

• 网页访问