To allow tcp traffic on a specific port using Istio, one will have to patch the istio-ingressgateway service to add the new port if the port is not 80 or 443. Then one will have to create a gateway, a virtual service, and also make sure that the deployments have the sidecar injected automatically. So to summarize:
1. Patch istio-ingressgateway to add new tcp port
2. Create gateway resource
3. Create virtual service resource
4. Make sure that the actual pod is injected with sidecar.
It is very important that the tcp port to be added before the gateway and virtual service resource were created, otherwise, it wont work.
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