kubernetes - Traefik负载平衡权重未按预期运行

Question

我为traefik配置了以下入口，但是traefik会将所有流量发送到app-blue-release。理想情况下，它应该只将30％的流量发送到蓝色，将70％的流量发送到绿色，但是并没有按预期运行。

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  annotations:
    traefik.frontend.entryPoints: http
    traefik.ingress.kubernetes.io/service-weights: |-
      app-green-release: 70.0
      app-blue-release: 30.0
  creationTimestamp: 2019-06-04T06:00:37Z
  generation: 2
  labels:
    app: traefik-app
  name: traefik-app
  namespace: mynamespace
  resourceVersion: "645536328"
  selfLink: /apis/extensions/v1beta1/namespaces/mynamespace/ingresses/traefik-app
  uid: 4637377-747b-11e9-92ea-005056aeabf7
spec:
  rules:
  - host: mycompany2.com
    http:
      paths:
      - backend:
          serviceName: app-release
          servicePort: 8080
  - host: mycompany.com
    http:
      paths:
      - backend:
          serviceName: app-ui-release
          servicePort: 80
        path: /widget
      - backend:
          serviceName: app-green-release
          servicePort: 8080
        path: /
      - backend:
          serviceName: app-blue-release
          servicePort: 8080
        path: /
status:
  loadBalancer: {}

我正在使用以下流量版本。
traefik:v1.7.11-alpine

之前，当配重配置为10(蓝色)和90(绿色)时，它就可以正常工作。但是，一旦我们分别更改为30和70，就会发生此问题。

任何人以前都曾遇到过这样的问题。谢谢您的帮助

Answer 1

似乎跟着traefik issue 4494(而不是您自己的issue 4940)

the annotation ingress.kubernetes.io/service-weights has been added in v1.7, before the annotation was ignored.

但是， as of June 11th, 2019，Damien Duportal(Træfik的开发人员倡导者)补充说:

There is no known workaround for now.
We are working on this, but as the version 2.0 of Traefik is currently worked on, we have to wait :)

这来自 PR 3112

Provides a new ingress annotation ingress.kubernetes.io/backend-weights which specifies a YAML-encoded, percentage-based weight distribution. With this annotation, we can do canary release by dynamically adjust the weight of ingress backends.

(最初在 commit 11f6079中重命名为 ingress.kubernetes.io/percentage-weights之前称为 ingress.kubernetes.io/service-weights)

该问题仍然悬而未决。
首先尝试升级到 v1.7.12-alpine，以检查问题是否仍然存在。

The example提到:

service_backend1: 1% # Note that the field names must match service names referenced in the Ingress object.
service_backend2: 33.33%
service_backend3: 33.33% # Same as 33.33%, the percentage sign is optional

因此，请尝试以下操作:

  app-green-release: 70%
  app-blue-release: 30%