CircleCI

Users may encounter issues with missing Cgroup files, such as <code>/sys/fs/cgroup/cpu/cpu.shares</code> and <code>/sys/fs/cgroup/memory/memory.max_usage_in_bytes</code>, in CircleCI build containers. This is due to the transition from CgroupV1 to CgroupV2, which affects how resource information is accessed within the containers.

Understanding the Change: CircleCI is transitioning from CgroupV1 to CgroupV2. This change affects the availability of certain files used to determine resource allocation in build containers.

- Instead of using <code>/sys/fs/cgroup/cpu/cpu.shares</code>, use <code>/sys/fs/cgroup/cpu.max</code>.
- Instead of using <code>/sys/fs/cgroup/memory/memory.max_usage_in_bytes</code>, consider using <code>/sys/fs/cgroup/memory.peak</code>.

Planning for CgroupV2: Begin planning to update your scripts to be compatible with CgroupV2, as this will be the standard going forward.

1. Understanding the Change: CircleCI is transitioning from CgroupV1 to CgroupV2. This change affects the availability of certain files used to determine resource allocation in build containers.
2. Adjusting Scripts for CgroupV2:
 - Instead of using <code>/sys/fs/cgroup/cpu/cpu.shares</code>, use <code>/sys/fs/cgroup/cpu.max</code>.
 - Instead of using <code>/sys/fs/cgroup/memory/memory.max_usage_in_bytes</code>, consider using <code>/sys/fs/cgroup/memory.peak</code>.
3. Planning for CgroupV2: Begin planning to update your scripts to be compatible with CgroupV2, as this will be the standard going forward.

<a href="https://docs.kernel.org/admin-guide/cgroup-v2.html" rel="nofollow noopener noreferrer" target="_blank">docs.kernel.org: Control Group v2 documentation</a>

<a href="https://discuss.circleci.com/t/docker-executor-infrastructure-upgrade/52282" rel="nofollow noopener noreferrer" target="_blank">CircleCI Docker Executor Infrastructure Upgrade</a>

- <a href="https://docs.kernel.org/admin-guide/cgroup-v2.html" rel="nofollow noopener noreferrer" target="_blank">docs.kernel.org: Control Group v2 documentation</a>
- <a href="https://discuss.circleci.com/t/docker-executor-infrastructure-upgrade/52282" rel="nofollow noopener noreferrer" target="_blank">CircleCI Docker Executor Infrastructure Upgrade</a>

Resolving Missing Cgroup Files in CircleCI Build Environments

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Resolving Missing Cgroup Files in CircleCI Build Environments

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