philsvk/ingress-controller-helm

How to upgrade ingress-nginx controller without downtime

Step 1: Install existing ingress-nginx controller with older version

# disable controller service
helm upgrade --install ingress-nginx-new ingress-nginx \
--repo https://kubernetes.github.io/ingress-nginx \
--namespace ingress-nginx \
--set controller.service.enabled=false

Step 2: create new ingress-nginx controller

• create new nginx controller in the same namespace with new app label

# disable controller service and admissionWebhooks
helm upgrade --install ingress-nginx-new ingress-nginx \
--repo https://kubernetes.github.io/ingress-nginx \
--namespace ingress-nginx \
--set controller.service.enabled=false \
--set controller.admissionWebhooks.enabled=false

Note: admissionWebhooks is not supported in GKE

Step 3: change old nginx service point to new nginx controller label

• change old nginx service point to new nginx controller label

Step 4: delete old nginx controller

helm uninstall ingress-nginx -n ingress-nginx

How to set custom configuration on helm chart

# fetch helm chart to see setting
helm fetch ingress-nginx/ingress-nginx --repo https://kubernetes.github.io/ingress-nginx

# example of set custom configuration
helm upgrade --install ingress-nginx-new-nlb ingress-nginx \
  --repo https://kubernetes.github.io/ingress-nginx \
  --namespace ingress-nginx \
  --set controller.ingressClassResource.name="ingress-nginx-new-nlb" \
  --set controller.ingressClass="ingress-nginx-new-nlb" \
  --set controller.service.annotations."service\.beta\.kubernetes\.io/aws-load-balancer-type"="nlb"

Note: Setting default IngressClass

specific IngressClass -> default backend
  annotations:
    ingressclass.kubernetes.io/is-default-class: 'true'