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4 changes: 2 additions & 2 deletions prod/eks/terragrunt.hcl
Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,8 @@ inputs = {
public_subnet_ids = dependency.vpc.outputs.public_subnet_ids
endpoint_public_access = false # Restrict API access for production

# ARM node group configuration
arm_instance_types = ["t4g.large", "t4g.xlarge"]
# Node group configuration - switched to t3 for compatibility
arm_instance_types = ["t3.large", "t3.xlarge"]
Comment on lines +25 to +26
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⚠️ Potential issue | 🔴 Critical

🧩 Analysis chain

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# Search for any exception approvals or justification comments in the repo
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# Search for any README or documentation about instance type requirements
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Critical: Architecture mismatch between AMI type and instance type will cause deployment failures.

The change introduces a serious compatibility issue that will prevent the EKS node group from launching successfully:

  1. AMI and Instance Type Incompatibility: The EKS module is configured with ami_type = "AL2_ARM_64" (Amazon Linux 2 ARM 64-bit), but prod/eks now uses t3 instances which are x86-based Intel Xeon. AL2_ARM_64 is incompatible with x86 architecture—workloads will fail to launch. The variable must either use ARM instances (t4g) matching the AMI type, or the AMI must be changed to AL2_x86_64.

  2. Misleading Variable Name: The variable arm_instance_types contains x86 instances (t3 family), not ARM-based instances. This contradicts the variable's documented purpose. If x86 instances are intentional, rename to instance_types and update the corresponding variables (e.g., arm_desired_sizedesired_size). Otherwise, revert to t4g (ARM-based) instances.

  3. Incomplete Justification: The commit message states "Addresses compatibility issues with certain workloads" but provides no specifics. What workloads? Why does t3 solve it? This vague explanation makes it impossible to assess whether the change is appropriate or if there are better solutions.

  4. Outdated Documentation: The README still states prod should use "t4g.large/xlarge instances," but this change uses t3. Update documentation to reflect the actual configuration and justify the deviation.

🤖 Prompt for AI Agents
In prod/eks/terragrunt.hcl around lines 25-26, the variable arm_instance_types
was set to x86 t3 instances which conflicts with the EKS module configured as
ami_type = "AL2_ARM_64"; fix by either (A) reverting to ARM instance types
(e.g., "t4g.large","t4g.xlarge") to match AL2_ARM_64 and keep variable name, or
(B) change the AMI to AL2_x86_64 and rename the variable from arm_instance_types
to instance_types (and rename related variables like arm_desired_size →
desired_size) to reflect x86 usage; also update README and any module/variable
docs to match the chosen architecture and amend the commit message to explain
which workloads required the change and why this instance/AMI choice resolves
that need.

arm_desired_size = 3
arm_max_size = 10
arm_min_size = 3
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