Reach container/app by hostname

[Luca Lupo]

Hi There,

I have 2 clusters: cluster A and cluster B. 

I have an app A running on cluster A (docker container) and an app B running on cluster B (docker container).

All instances of app B needs to send messages (REST API) to app A and I want that to be happening using the app hostname (the one google Kubernetes assigns to each pod of a deployed app) but the host cannot be resolved apparently because app A fails to reach app B using app B hostname.

Any idea what I need to do here? Note that I can expose a load balancer and that works BUT I really need to reach individual pods here.

Thanks!

[Jason]

Hi,

The first way to do it is as you have already stated, exposing the deployment. The other way I recommend is using Istio [1]. Istio helps create a multi cluster mesh on a shared network to allow communication between the clusters. I would suggest reading the attached article and see if this can help in regards to your use case.

[1] https://istio.io/latest/docs/concepts/what-is-istio/