Kubernetes - 配置Nginx-Ingress 作为服务发现

  • 添加 Kubernetes ConfigMap配置来自定义端口与服务的映射关系
    • 配置文件， 有二个在默认空间下web服务和api服务分别映射到自定义端口 9001， 9002 
      1 apiVersion: v1
2 kind: ConfigMap
3 metadata:
4   name: mysite-configmap
5 data:
6   9000: "default/web:8080"
7   9001: "default/api:8080"
    • 在kubernetes Master服务器应用 ConfigMap 配置 
      kubectl apply -f mysite-configmap.yml
  • 配置 Default Backend 
    • kind: Deployment
apiVersion: extensions/v1beta1
metadata:
  name: default-http-backend
spec:
  revisionHistoryLimit: 10
  replicas: 1
  template:
    metadata:
      labels:
        app: default-http-backend
    spec:
      terminationGracePeriodSeconds: 60
      containers:
      - name: default-http-backend
        # Any image is permissable as long as:
        # 1. It serves a 404 page at /
        # 2. It serves 200 on a /healthz endpoint
        image: defaultbackend:1.0
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080
            scheme: HTTP
          initialDelaySeconds: 30
          timeoutSeconds: 5
        ports:
        - containerPort: 8080
        resources:
          limits:
            cpu: 10m
            memory: 20Mi
          requests:
            cpu: 10m
            memory: 20Mi
      kubectl apply -f default-backend-deployment.yml
      ---

apiVersion: v1
kind: Service
metadata:
  name: default-http-backend
  labels:
    app: default-http-backend
spec:
  ports:
  - port: 8080
    protocol: TCP
    targetPort: 8080
  selector:
    app: default-http-backend
      kubectl apply -f default-backend-service.yml

       

  • 配置Ingress
    • 配置 Ingress Deployment, 暴露自定义的端口, 并指定 tcp-services-configmap 来导入我们在上一步配置的端口映射
      • 配置文件,  
         1 apiVersion: extensions/v1beta1
 2 kind: Deployment
 3 metadata:
 4   name: nginx-ingress-deployment
 5   labels:
 6     k8s-app: nginx-ingress-lb
 7 spec:
 8   revisionHistoryLimit: 10
 9   replicas: 1
10   template:
11     metadata:
12       labels:
13         k8s-app: nginx-ingress-lb
14         name: nginx-ingress-lb
15     spec:
16       terminationGracePeriodSeconds: 60
17       containers:
18       - image: nginx-ingress-controller:0.8.3
19         name: nginx-ingress-lb
20         imagePullPolicy: Always
21         readinessProbe:
22           httpGet:
23             path: /healthz
24             port: 10254
25             scheme: HTTP
26         livenessProbe:
27           httpGet:
28             path: /healthz
29             port: 10254
30             scheme: HTTP
31           initialDelaySeconds: 10
32           timeoutSeconds: 1
33         # use downward API
34         env:
35           - name: POD_NAME
36             valueFrom:
37               fieldRef:
38                 fieldPath: metadata.name
39           - name: POD_NAMESPACE
40             valueFrom:
41               fieldRef:
42                 fieldPath: metadata.namespace
43         ports:
44         - containerPort: 9000
45           protocol: TCP
46         - containerPort: 9001
47           protocol: TCP
48 
49         args:
50         - /nginx-ingress-controller
                   - --default-backend-service=$(POD_NAMESPACE)/default-http-backend
        51         - --tcp-services-configmap=$(POD_NAMESPACE)/mysite-configmap

         

      • 应用配置 
        kubectl apply -f nginx-ingress-deployment.yml

         

    • 配置 Ingress Service, 配置自定义端口与ConfigMap的端口映射关系及服务名称 
      • 配置文件 
         1 ---
 2 
 3 apiVersion: v1
 4 kind: Service
 5 metadata:
 6   name: nginx-ingress-lb
 7   labels:
 8     k8s-app: nginx-ingress-lb
 9 spec:
10   type: NodePort
11   ports:
12   - port: 9000
13     protocol: TCP
14     targetPort: 9000
15     nodePort: 30005
16     name: web
17   - port: 9001
18     protocol: TCP
19     targetPort: 9001
20     nodePort: 30006
21     name: api
22 
23   selector:
24     k8s-app: nginx-ingress-lb

         

      • 应用配置 
        kubectl apply -f nginx-ingress-service.yml

         

  • 配置Nginx 反向代理
    • 添加 Upstream 配置 
       1 upstream web {
 2   server my-server-1:3005 max_fails=1 fail_timeout=10s;
 3   server my-server-2:3005 max_fails=1 fail_timeout=10s;
 4 }
 5 
 6 upstream api {
 7   server my-server-1:3006 max_fails=1 fail_timeout=10s;
 8   server my-server-2:3006 max_fails=1 fail_timeout=10s;
 9 }
10 
11 server {
12   listen 80;
13   listen       443 ssl;
14   
15   ssl_certificate    /etc/nginx/conf.d/cert/wildcard.mysite.pem;
16   ssl_certificate_key    /etc/nginx/conf.d/cert/wildcard.mysite.key;
17   location / {
18        proxy_pass http://web;
19     proxy_set_header X-Forwarded-Host $host;
20     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
21   }
22 
23   location ~^/(api) {
24     proxy_pass http://api;
25     proxy_set_header X-Forwarded-Host $host;
26     proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
27 
28     if ($http_origin ~* (^(https?://(?:.+\.)?mysite\.com)$)) {
29       set $cors "CORS";
30       set $cors_method "${cors}_${request_method}";
31     }
32 
33     if ($cors_method = "CORS_OPTIONS") {
34       add_header 'Access-Control-Allow-Origin' '$http_origin';
35       add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
36       #
37       # Custom headers and headers various browsers *should* be OK with but aren't
38       #
39       add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
40       #
41       # Tell client that this pre-flight info is valid for 20 days
42       #
43       add_header 'Access-Control-Max-Age' 1728000;
44       add_header 'Content-Type' 'text/plain charset=UTF-8';
45       add_header 'Content-Length' 0;
46       return 204;
47     }
48 
49     if ($cors = "CORS") {
50       add_header 'Access-Control-Allow-Origin' '$http_origin';
51       add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS';
52       add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
53     }
54   }
55 }

       

posted @ 2017-08-16 11:18  bruceHuang  阅读(12320)  评论(1)  编辑  收藏  举报