周末爬坑,IngressController恢复因为镜像下载和版本问题折腾一下午,晚上终于折腾出个眉目。
首先,在Kubernetes的session中是可以设置Session Affinity的。例子如下:
[root@k8s-master ~]# cat rc.yaml apiVersion: v1 kind: ReplicationController metadata: name: helloworld-service spec: replicas: 2 template: metadata: labels: weblogic-app: "helloworld" version: "0.1" spec: containers: - name: weblogichelloworld image: 1213-helloworld:v2 ports: - containerPort: 7001 --- apiVersion: v1 kind: Service metadata: name: helloworldsvc labels: weblogic-app: helloworld spec: type: NodePort ports: - port: 7001 protocol: TCP targetPort: 7001 name: http nodePort: 30005 selector: weblogic-app: helloworld sessionAffinity: ClientIP
最核心就是最后那句,会基于客户端访问服务的ip进行hash运算后把同一ip的请求路由到同一个pod.这样通过nodePort方式过来的请求就不会到处分发了。
但这并不意味着通过IngressController过来的请求不会到处发,实际上在gcr.io/google_containers/nginx-ingress-controller:0.61版本就加上了session stick的功能,需要你在
创建Ingress对象的时候添加Annotation,比如:
apiVersion: extensions/v1beta1 kind: Ingress metadata: name: dashboard-weblogic-ingress annotations: ingress.kubernetes.io/affinity: "cookie" ingress.kubernetes.io/session-cookie-name: "route" ingress.kubernetes.io/session-cookie-hash: "sha1" spec: rules: - host: helloworld.paic.test http: paths: - backend: serviceName: helloworldsvc servicePort: 7001 path: /
如何验证这个annotation已经生效了呢?这个问题我折腾了很久,因为按照文档的说法通过
curl -v http://<ingress-svc-address> -H ‘Host: example.com‘ kubectl exec -n kube-system nginx-ingress-lb-303jx -- curl -v localhost -H‘Host: helloworld.test‘
全部返回的是404,503,并没有以下的cookie
< Set-Cookie: route=dc89ae303c62a8bfce8bf32f06d27c31f0980ef7; Path=/; HttpOnly
无奈进入IngressController,查看具体的最终Nginx配置
在 /etc/nginx/nginx.conf 中。
而Pod的信息是
可见Nginx是绕开了Service,直接把pod的ip写入到配置文件,所以也就是Service中的Session Affinity设置应该不起作用。
但Cookie到底有没有设置成功呢,通过chrome访问网站,然后查看Cookie
成功看到,验证的时候也没问题,所以应该配置生效。
最后贴一个ingress-controller的yaml
[root@k8s-master ingress]# cat nginx-ingress-controller.yaml apiVersion: v1 kind: ReplicationController metadata: name: nginx-ingress-lb labels: name: nginx-ingress-lb namespace: kube-system spec: replicas: 1 template: metadata: labels: name: nginx-ingress-lb annotations: prometheus.io/port: ‘10254‘ prometheus.io/scrape: ‘true‘ spec: terminationGracePeriodSeconds: 60 hostNetwork: true containers: - image: gcr.io/google_containers/nginx-ingress-controller:0.9.0-beta.7 name: nginx-ingress-lb readinessProbe: httpGet: path: /healthz port: 10254 scheme: HTTP livenessProbe: httpGet: path: /healthz port: 10254 scheme: HTTP initialDelaySeconds: 10 timeoutSeconds: 1 ports: - containerPort: 80 hostPort: 80 - containerPort: 443 hostPort: 443 env: - name: POD_NAME valueFrom: fieldRef: fieldPath: metadata.name - name: POD_NAMESPACE valueFrom: fieldRef: fieldPath: metadata.namespace - name: KUBERNETES_MASTER value: http://192.168.0.104:8080 args: - /nginx-ingress-controller - --default-backend-service=$(POD_NAMESPACE)/default-http-backend - --apiserver-host=http://192.168.0.104:8080
IngressController的session stick问题
原文:http://www.cnblogs.com/ericnie/p/7858204.html