I have a Azure Container Instance, and I want to connect to a kafka that is also in the azure. If in kafka configure the advertised.listeners with dns I can connect, however with hostname I can not. In ACI I also can not ping/wget/telnet to other internal resources, just for other ACIs.
vnet kafka = vnetA subnet kafka = subnetA
vnet ACI = vnetA subnet ACI = subnetB
I created the ACI with private ip.
For your issue that the Azure Container Instances connect with other Azure resources. Now the Azure Container Instance just supports a private IP and no DNS labels, and the instances can connect with other resources in the same Vnet or in different Vnet with peering.
Container groups deployed to a virtual network do not currently support public IP addresses or DNS name labels.
So you can just connect the ACI with the private IP the Vnet. And it just is a preview version. For more details, see Deploy container instances into an Azure virtual network
This article explains how to configure your listeners in this situation: https://rmoff.net/2018/08/02/kafka-listeners-explained/
