[rsanders]

My last company used Terraform to manage Kubernetes. The main issue is that the TF Kubernetes provider supports a limited subset of K8S object types, and of fields within those K8S objects. For example: TF didn't even support Deployment objects until sometime in mid/late 2019 (I may be wrong on timing, but it was long after they were the primary method for general scheduling of long-running containers).

We ended up using TF's Helm provider, sometimes with hacks like a helm chart which deploys an arbitrary YAML file (the so-called "raw" chart). At that point, Terraform is blind to what's actually happening inside K8S. You can still benefit from the ability of TF to pass data from your other infra automation into the Helm charts, of course, but it's really Helm actually managing the configuration of your K8S cluster. And that's the app we all love to hate.

The situation may have been improved, but my conclusion was that it would always be a somewhat incomplete interface.

[cbushko]

The terraform provider has caught up a bit in the last 6 months. It is still missing things like CRD support.

For those things we use a direct kubectl yaml provider.

I wish there was an istio provider!