CODEWITHSUNDEEP
kuberneteskubernetes-ingress
Mukund Jalan
Mukund Jalan

Reputation: 1339

Append a rule to a k8s ingress object

We have a kubernetes Ingress object defined. All the ingress rules are not available when defining object for the first time, hence we would like to append rules to it on the fly when configuring respective services to use with it.

Example:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  annotations:
    alb.ingress.kubernetes.io/certificate-arn: ${acm_arn}
    alb.ingress.kubernetes.io/scheme: internet-facing
    alb.ingress.kubernetes.io/target-type: instance
    kubernetes.io/ingress.class: alb
  name: ${ingress_name}
  namespace: ${namespace}
spec:
  rules:
    - host: api.${region}.infra.${hosted_zone}
      http:
        paths:
          - backend:
              service:
               name: istio-ingressgateway
               port:
                number: 80
            path: /*
            pathType: Prefix
    - http:
        paths:
          - backend:
              service:
               name: nginx-ingress-controller
               port:
                number: 80
            path: /*
            pathType: Prefix

The above object is created in the beginning. Now, we would like to append a third rule to it at later point in time.

apiVersion: networking.k8s.io/v1
kind: Ingress
  name: ${ingress_name}
  namespace: ${namespace}
spec:
  rules:
    - host: api.${region}.${some_dynamic_variable}.${hosted_zone}
      http:
        paths:
          - backend:
              service:
               name: istio-ingressgateway
               port:
                number: 80
            path: /*
            pathType: Prefix

I could have used kubectl patch but because the merge strategy is not specified in the api docs, I understand it follows the merge strategy replace which is not what I intend to do.

What is the best available option to get this issue resolved?

Upvotes: 0

Views: 1738

Answers (1)

pjo
pjo

Reputation: 21

There is a kubectl plugin called ingress-rule. It allows you to configure an Ingress on the command line. The plugin is available via krew. If you have krew installed simply install the plugin with:

kubectl krew install ingress-rule

Add a new rule to a existing Ingress:

kubectl ingress-rule -n $NAMESPACE set $INGRESSNAME --service $SERVICENAME --port 80 --host $HOST

Delete the previously added rule:

kubectl ingress-rule -n $NAMESPACE delete $INGRESSNAME --service $SERVICENAME

Upvotes: 2

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