Not able to read memory metrics with cgroup v2 and latest docker + ubuntu 22.04
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Description
I'm trying to read docker memory metrics from /sys/fs.
What worked previously on Ubuntu 18.04 and 20.04 doesn't work with latest ubuntu 22.04 and latest available docker: Docker version 20.10.17, build 100c701
Previously we were reading metrics from /sys/fs/cgroup/memory/docker/CONTAINER_ID/ and since now we have cgroup v2 then according to official documentation we should be reading those from: /sys/fs/cgroup/docker/CONTAINER_ID/ but /sys/fs/cgroup/docker doesn't exist.
root@srv01:/home/tuser# docker info | grep -i driver
Storage Driver: overlay2
Logging Driver: json-file
Cgroup Driver: systemd
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by comparing the reported /sys/fs/cgroup/memory/docker/CONTAINER_ID/ and /sys/fs/cgroup/docker/CONTAINER_ID/ paths with Docker 20.10.17, Ubuntu 22.04, cgroup v2, and the systemd cgroup driver described in the official documentation. Done means the documentation accurately identifies where to read container memory metrics or explains the required configuration.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- docker, linux, ubuntu
- Domain
- devops, documentation
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 28/100