Service weights for ingress objects

paltryeffort · March 26, 2021, 1:57pm

I am using traefik 1.7 and I would like to migrate to traefik 2.x. On my ingress objects I use:

annotations:
  traefik.ingress.kubernetes.io/service-weights: |
    app-prod: 30%
    app-preprod: 70%

I understand that in traefik 2.x I should use TraefikService for this. However, this only works with IngressRoute but I am stuck with Ingress objects. Is there any way to have service weights for Ingress objects and if not, are there any plans to implement such a feature?

jakubhajek · March 26, 2021, 4:26pm

Hello @paltryeffort

You are right, there is no such annotation available in v2. However, you can use TraefikService and use a weighted load balancer between Kubernetes services. One of my old examples of how to do that you can find here:

github.com

jakubhajek/traefik-kubernetescrd/blob/ff8e1934db135395b92e60778a3bed081881a187/03-canary-deployment/02-canary-webapp-V2/ingress-canary.yml#L8


---
apiVersion: traefik.containo.us/v1alpha1
kind: TraefikService
metadata:
  name: webapp-canary
  namespace: webapp
spec:
  weighted:
    services:
      - name: webapp-v1
        weight: 3
        port: 3000
        # Optional, as it is the default value
        kind: Service
      - name: webapp-v2
        weight: 1
        port: 3000
        kind: Service

Would you please share why Ingress is mandatory - please also note that you can use both: Kubernetes Ingress and Kubernetes IngressRoute with CRD.

Thank you,