How to create custom istio ingress gateway controller?

Okay, I found the answer after looking at the code of Istio installation via helm. So, basically the istio have an official way (but not really documented in their readme.md file) to add additional gateway (ingress and egress gateway). I know that because I found this yaml file in their github repo and read the comment (also looking at the gateway chart template code for the spec and its logic).

So, I solved this by, for example, defining this values-custom-gateway.yaml file:

# Gateways Configuration
# By default (if enabled) a pair of Ingress and Egress Gateways will be created for the mesh.
# You can add more gateways in addition to the defaults but make sure those are uniquely named
# and that NodePorts are not conflicting.
# Disable specifc gateway by setting the `enabled` to false.
#
gateways:
  enabled: true

  agung-ingressgateway:
    namespace: agung-ns
    enabled: true
    labels:
      app: agung-istio-ingressgateway
      istio: agung-ingressgateway
    replicaCount: 1
    autoscaleMin: 1
    autoscaleMax: 2
    resources: {}
      # limits:
      #  cpu: 100m
      #  memory: 128Mi
      #requests:
      #  cpu: 1800m
      #  memory: 256Mi

    loadBalancerIP: ""
    serviceAnnotations: {}
    type: LoadBalancer #change to NodePort, ClusterIP or LoadBalancer if need be

    ports:
      ## You can add custom gateway ports
    - port: 80
      targetPort: 80
      name: http2
      # nodePort: 31380
    - port: 443
      name: https
      # nodePort: 31390
    - port: 31400
      name: tcp
    secretVolumes:
    - name: ingressgateway-certs
      secretName: istio-ingressgateway-certs
      mountPath: /etc/istio/ingressgateway-certs
    - name: ingressgateway-ca-certs
      secretName: istio-ingressgateway-ca-certs
      mountPath: /etc/istio/ingressgateway-ca-certs

If you take a look at yaml file above, I specified the namespace other than istio-system ns. In this case, we can have a way to customize the TLS and ca cert being used by our custom gateway. Also the agung-ingressgateway as the holder of the custom gateway controller spec is used as the gateway controller's name.

Then, i just install the istio via helm upgrade --install so that helm can intelligently upgrade the istio with additional gateway.

helm upgrade my-istio-release-name <istio-chart-folder> --install

Once it upgrades successfully, I can specify custom selector to my Gateway:

---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: agung-gateway
  namespace: agung-ns
spec:
  selector:
    app: agung-istio-ingressgateway # use custom gateway
    # istio: ingressgateway # use Istio default gateway implementation
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"
  - port:
      number: 443
      name: https
      protocol: HTTPS
    tls:
      mode: SIMPLE
      serverCertificate: /etc/istio/ingressgateway-certs/tls.crt
      privateKey: /etc/istio/ingressgateway-certs/tls.key
    hosts:
    - "*"

This is what I use in Istio 1.4.

To generate the new istio-ingressgateway Deployment, Service and ServiceAccount in your own namespace (bookinfo in this example)

helm template install/kubernetes/helm/istio/ \
  --namespace bookinfo \
  --set global.istioNamespace=istio-system \
  -x charts/gateways/templates/deployment.yaml \
  -x charts/gateways/templates/service.yaml  \
  -x charts/gateways/templates/serviceaccount.yaml \
  --set gateways.istio-ingressgateway.enabled=true \
  --set gateways.istio-egressgateway.enabled=false \
  --set gateways.istio-ingressgateway.labels.app=custom-istio-ingressgateway \
  --set gateways.istio-ingressgateway.labels.istio=custom-ingressgateway \
  > customingress.yaml

then, apply the generated file:

kubectl apply -f customingress.yaml

Now, you can refer to this from your Gateway resource like:

apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
  name: bookinfo-gateway
spec:
  selector:
    istio: custom-ingressgateway # use the CUSTOM istio controller
  servers:
  - port:
      number: 80
      name: http
      protocol: HTTP
    hosts:
    - "*"

You can set custom Service annotations by adding it to the helm template command like this:

 --set gateways.istio-ingressgateway.serviceAnnotations.'service\.kubernetes\.io/ibm-load-balancer-cloud-provider-ip-type'=private \