feat: add support to use placement group in launch template #4929
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npalm
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Dec 6, 2025
| placement = optional(object({ | ||
| affinity = optional(string) | ||
| availability_zone = optional(string) | ||
| # group_id = try(placement.value.group_id, null) # aws >= 6.12.0 |
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Why is the comment. Requiring a newer version of the provider?
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The provider aws also allow to use group ID in placement, but only not in all versions. I left the commented so it can be added in the future. I can remove if is misleading
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Description
This PR adds support for configuring EC2 placement groups for GitHub Actions runners in the multi-runner module. It plumbs a new placement option from the runner configuration through to the underlying EC2 runner module.
Details
Updated modules/multi-runner/runners.tf to pass placement = each.value.runner_config.placement into the runners module.
This allows specifying AWS placement groups for EC2 runners, enabling tighter control over instance placement.
The change is backwards compatible: if placement is unset in runner_config, behavior remains unchanged.
Motivation / Future work
Placement groups are a prerequisite for supporting macOS runners, which require a host_id.
A follow-up PR will add explicit macOS support leveraging this new placement wiring.