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How to patch a deployed Ingress resource on Kubernetes?

Ask Time:2018-06-08T21:55:29         Author:Kostas Demiris

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I have the following Ingress resource:

apiVersion: extensions/v1beta1
kind: Ingress
metadata:
  name: main-ingress
  annotations:
    kubernetes.io/ingress.class: nginx
    nginx.ingress.kubernetes.io/ssl-redirect: "false"
    nginx.ingress.kubernetes.io/force-ssl-redirect: "false"
    nginx.ingress.kubernetes.io/proxy-read-timeout: "86400"
    nginx.ingress.kubernetes.io/proxy-send-timeout: "86400"

spec:
  tls:
  - secretName: the-secret
    hosts:
      - sample.domain.com
      - sample2.domain.com
      - rabbit.domain.com
      - hub.domain.com
      - grafana.domain.com

  rules:

  - host: sample.domain.com
    http:
      paths:
      - path: /
        backend:
          serviceName: fe-srvc
          servicePort: 80
      - path: /api
        backend:
          serviceName: be-srvc
          servicePort: 80

  - host: sample2.domain.com
    http:
      paths:
      - path: /
        backend:
          serviceName: fe2-srvc
          servicePort: 80
      - path: /api
        backend:
          serviceName: be-srvc
          servicePort: 80

## The Extra Services ###
  - host: rabbit.domain.com
    http:
      paths:
      - path: /
        backend:
          serviceName: rabbitmq-srvc
          servicePort: 80

and I want to patch it after it is deployed.

So I use this, to try and replace the be-srvc value with some-srvc :

kubectl patch ing/main-ingress --patch '{ "spec" : { "rules": [{"http":{"paths":[ {"- path":"/"},{"backend":{"serviceName":"other-srvc"}},{"servicePort":"80"} ] }}]}}'

and I get this error:

The Ingress "main-ingress" is invalid:
* spec.rules[0].http.backend.serviceName: Required value
* spec.rules[0].http.backend.servicePort: Invalid value: 0: must be between 1 and 65535, inclusive

Any insight would be appreciated!

Author:Kostas Demiris,eproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article:https://stackoverflow.com/questions/50762250/how-to-patch-a-deployed-ingress-resource-on-kubernetes
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