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在負(fù)載均衡ALB ingress中，可以通過(guò)添加注解（annotation）來(lái)實(shí)現(xiàn)一些高級(jí)功能，以下是使用注解的一些示例：

1. 自定義HTTP頭部

通過(guò)添加注解，可以自定義HTTP請(qǐng)求的頭部信息，添加一個(gè)名為XCustomHeader的自定義頭部：

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myingress
  annotations:
    alb.ingress.kubernetes.io/scheme: internetfacing
    alb.ingress.kubernetes.io/listenports: '[{"HTTP": 80}, {"HTTPS":443}]'
    alb.ingress.kubernetes.io/actions.sslredirect: '{"Type": "redirect", "RedirectConfig": { "Protocol": "HTTPS", "Port": "443", "StatusCode": "HTTP_301"}}'
    alb.ingress.kubernetes.io/headers: '{"XCustomHeader": "myvalue"}'
spec:
  ingressClassName: alb
  rules:
  http:
      paths:
      path: /
        pathType: Prefix
        backend:
          service:
            name: myservice
            port:
              number: 80

2. SSL重定向

通過(guò)添加注解，可以實(shí)現(xiàn)將HTTP請(qǐng)求重定向到HTTPS。

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myingress
  annotations:
    alb.ingress.kubernetes.io/scheme: internetfacing
    alb.ingress.kubernetes.io/listenports: '[{"HTTP": 80}, {"HTTPS":443}]'
    alb.ingress.kubernetes.io/actions.sslredirect: '{"Type": "redirect", "RedirectConfig": { "Protocol": "HTTPS", "Port": "443", "StatusCode": "HTTP_301"}}'
spec:
  ingressClassName: alb
  rules:
  http:
      paths:
      path: /
        pathType: Prefix
        backend:
          service:
            name: myservice
            port:
              number: 80

3. 自定義健康檢查路徑和狀態(tài)碼

通過(guò)添加注解，可以自定義健康檢查的路徑和狀態(tài)碼。

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: myingress
  annotations:
    alb.ingress.kubernetes.io/scheme: internetfacing
    alb.ingress.kubernetes.io/listenports: '[{"HTTP": 80}, {"HTTPS":443}]'
    alb.ingress.kubernetes.io/healthcheckpath: "/custompath"
    alb.ingress.kubernetes.io/healthcheckfailurethreshold: '3'
    alb.ingress.kubernetes.io/healthythresholdcount: '3'
    alb.ingress.kubernetes.io/healthythresholdtime: '5'
    alb.ingress.kubernetes.io/successcodes: '200,201'
spec:
  ingressClassName: alb
  rules:
  http:
      paths:
      path: /
        pathType: Prefix
        backend:
          service:
            name: myservice
            port:
              number: 80

以上示例展示了如何在ALB ingress中使用注解實(shí)現(xiàn)自定義HTTP頭部、SSL重定向和自定義健康檢查路徑及狀態(tài)碼。

分享名稱(chēng)：請(qǐng)問(wèn)在負(fù)載均衡ALBingress里可以通過(guò)annotation實(shí)現(xiàn)嗎?
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