TFE FDO Kubernetes - "Plan errored - undefined" – HashiCorp Help Center

Problem

Runs give an error without a clear message of the issue

Prerequisites

You have Terraform Enterprise Flexible Deployment running on Kubernetes

Cause

Terraform Enterprise will start a new pod under the namespaceterraform-enterprise-agents. The issue could be that there are not enough resources on the Kubernetes cluster to start this pod.

Verify the events on the specified namespace

kubectl get events -n terraform-enterprise-agents

You might see the following for example

 0/1 nodes are available: 1 Insufficient memory. 
   preemption: 0/1 nodes are available: 
   1 No preemption victims found for incoming pod..

Solutions

Resize your Kubernetes cluster to have enough resources to start the specified pods

If the above is not an option then verify the settings as specified here

Alter the CPU/Memory a tasks is allowed to use
Alter the TFE_CAPACITY_CONCURRENCYfor a better fit on your Kubernetes cluster

Outcome

With enough resources the runs should execute and you should see these task pods starting

kubectl get pods -n terraform-enterprise-agents

NAME                                                  READY STATUS  RESTARTS AGE
tfe-task-ddab255d-7dc6-4ca9-8ecb-b47e8a27bee0-klzkh  1/1   Running 0        11s

If you still have issues then please create a ticket with HashiCorp Support

Additional Information

TFE FDO Kubernetes settings in our official documentation here