K8Strafficingressrewrite规则

需求如下:

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域名 service
www.baidu.com/authorize saas-jcpt-saas-uc-authorize-core-tomcat-online

分析:

1.要到ingress，所以前面不能去掉authorize

2.需要在ingress上配置rewrite

配置

www.baidu.com和saas-jcpt-saas-uc-authorize-core-tomcat-online这两个在不同的命名空间，所以需要在saas-jcpt-tomcat-online下创建一个新的ingress，配置如下:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: public-fe-n-saas-uc-node-online-ingress
namespace: saas-jcpt-tomcat-online
annotations:
traefik.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- host: www.baidu.com
http:
paths:
- backend:
serviceName: saas-jcpt-saas-uc-authorize-core-tomcat-online
servicePort: 8080
path: /authorize
status:
loadBalancer: {}

注意一个小坑：

如下需求：

域名 service

www.abc.com/aaa/ saas-jcpt-saas-uc-authorize-core-tomcat-online/bbb/

我们习惯的写法可能如下：

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: public-fe-n-saas-uc-node-online-ingress
  namespace: saas-jcpt-tomcat-online
  annotations:
    traefik.ingress.kubernetes.io/rewrite-target: /bbb/
spec:
  rules:
  - host: www.abc.com
    http:
      paths:
      - backend:
          serviceName: saas-jcpt-saas-uc-authorize-core-tomcat-online
          servicePort: 8080
        path: /aaa/
status:
  loadBalancer: {}

这个时候我们访问http://www.abc.com/aaa/xxx，我们发会现404，容器上抓包发现实际调用的URL为：saas-jcpt-saas-uc-authorize-core-tomcat-online/bbbxxx，中间的/没有了。

同时把path及traefik.ingress.kubernetes.io/rewrite-target最后的/去掉，问题可解决：

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: public-fe-n-saas-uc-node-online-ingress
  namespace: saas-jcpt-tomcat-online
  annotations:
    traefik.ingress.kubernetes.io/rewrite-target: /bbb
spec:
  rules:
  - host: www.abc.com
    http:
      paths:
      - backend:
          serviceName: saas-jcpt-saas-uc-authorize-core-tomcat-online
          servicePort: 8080
        path: /aaa
status:
  loadBalancer: {}

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