Actions runner: Allow configuration of cgroup quotas for systemd service

[blackliner]

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General

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It would be amazing if we could add a way to configure CPUQuota and MemoryMax to https://github.com/actions/runner/blob/main/src/Misc/layoutbin/actions.runner.service.template

The use case would be to run multiple small, stateful runners on a single, powerful machine, while keeping the resource usage of each runner in check.

[Hanashiko]

Hi @blackliner ,

I’d like to suggest enhancing the actions.runner.service.template file to support optional configuration of CPUQuota and MemoryMax. This would provide a flexible and native way to control system resource limits for each GitHub Actions runner instance when using systemd.

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Use case

In scenarios where multiple runners are hosted on a single, powerful machine (e.g., self-hosted runners for parallel jobs), it’s important to contain their resource usage. Being able to configure these systemd directives directly would help:

[Service]
CPUQuota=25%
MemoryMax=2G

This would ensure each runner doesn’t exceed a defined CPU or memory usage threshold, avoiding contention or resource starvation on shared machines.

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Proposal
Add placeholders in the actions.runner.service.template like:

CPUQuota={{CPUQuota}}
MemoryMax={{MemoryMax}}

Then users could set these values at installation or via environment substitution during configuration.