Now consider a different scenario where you want two separate load balancer instances running - shown in the figure below. With the Istio Gateway resource, the host key in the configuration and attaching a Gateway to a VirtualService, we can expose multiple different services from the cluster on different domain names or sub-domains. The fact that the service is of LoadBalancer type causes creating an actual load balancer instance and gives us an external IP address. We have a single ingress gateway - a Kubernetes service with LoadBalancer type and a Pod running Envoy. The scenario with a single load balancer would look like the figure below. A single load balancer can work well with a lot of scenarios, however there are cases where you might have one private or internal load balancer and a second public one. Load balancers cost money, and it’s yet another thing you need to manage. Now before you go and create multiple ingress gateways (and multiple load balancers with your cloud provider), make sure you need it. You can additionally customize your Istio installation, regardless of the profile, by passing additional -set = key/value pairs to the command. Getmesh istioctl install -set profile =demo
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