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Use systemd cgroup driver for v1.24.0+ #2737

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merged 9 commits into from May 10, 2022
Merged

Use systemd cgroup driver for v1.24.0+ #2737

merged 9 commits into from May 10, 2022

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BenTheElder
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see: #1726

@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label May 3, 2022
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: BenTheElder

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@k8s-ci-robot k8s-ci-robot added approved Indicates a PR has been approved by an approver from all required OWNERS files. size/L Denotes a PR that changes 100-499 lines, ignoring generated files. labels May 3, 2022
@BenTheElder BenTheElder mentioned this pull request May 3, 2022
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@BenTheElder BenTheElder force-pushed the systemd-driver branch 2 times, most recently from 1c3c1c0 to a5cf544 Compare May 3, 2022 19:31
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hmm 1.24 kubelet unhealthy
https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-e2e-kubernetes/1521573229309726720

https://storage.googleapis.com/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-e2e-kubernetes/1521573229309726720/artifacts/logs/kind-control-plane/kubelet.log

May 03 19:52:45 kind-control-plane kubelet[1749]: Error: failed to run Kubelet: invalid configuration: cgroup ["kubelet"] has some missing paths: /sys/fs/cgroup/pids/kubelet.slice, /sys/fs/cgroup/cpu,cpuacct/kubelet.slice, /sys/fs/cgroup/cpu,cpuacct/kubelet.slice, /sys/fs/cgroup/cpuset/kubelet.slice, /sys/fs/cgroup/memory/kubelet.slice, /sys/fs/cgroup/systemd/kubelet.slice, /sys/fs/cgroup/hugetlb/kubelet.slice

@BenTheElder BenTheElder changed the title use systemd cgroup driver for v1.24.0+ [WIP] use systemd cgroup driver for v1.24.0+ May 3, 2022
@k8s-ci-robot k8s-ci-robot added the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label May 3, 2022
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right ... all the entrypoint tricks are aimed at cgroupfs.

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So, when using the systemd cgroup driver kubelet will automatically append .slice to --cgroup-root if missing => /kubelet.slice (under /sys/fs/cgroup).

But we setup /kubelet and we're doing so on our own, so /kubelet.slice doesn't exist ...

We'll need to handle this differently.

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https://github.com/opencontainers/runc/blob/main/docs/systemd.md

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Got back to this a bit today:

  • kubelet appends .slice internally and you should not add it yourself
  • ... but the cgroup --cgroup-root + .slice must exist
  • if we use the current /kubelet cgroup root approach but populate /kubelet.slice instead, everything seems fine

Debating if we should plumb through a switch or just always setup both, leaning towards the latter so it's simpler to ensure either can be used.

@BenTheElder BenTheElder force-pushed the systemd-driver branch 2 times, most recently from d1c5998 to 9b0db6c Compare May 6, 2022 01:12
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s390x build flake https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-build/1522383838079094784

@BenTheElder BenTheElder force-pushed the systemd-driver branch 2 times, most recently from 18834fa to 5e58731 Compare May 6, 2022 02:34
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s390x flake again
https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-build/1522405658077433856
/retest

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BenTheElder commented May 6, 2022 •
edited

/retest

1.21 flake https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-e2e-kubernetes-1-21/1522405665769787392

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logs still show failing to remove rmda cgroup but that's not new to this PR / driver kubernetes/kubernetes#109182

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We need to test this in more environments before moving forward, just to be on the safe side that we haven't missed a quirk.

I'm pushing a node image from this, will update the PR with it so that github actions environments pick it up, and then see about getting it tested in some additional environments.

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podman the node only got this far:

INFO: ensuring we can execute mount/umount even with userns-remap
INFO: remounting /sys read-only
INFO: making mounts shared
INFO: detected cgroup v1
WARN: cgroupns not enabled! Please use cgroup v2, or cgroup v1 with cgroupns enabled.
INFO: fix cgroup mounts for all subsystems

exit status 1 https://github.com/kubernetes-sigs/kind/actions/runs/2296780194

@BenTheElder BenTheElder changed the title [WIP] use systemd cgroup driver for v1.24.0+ Use systemd cgroup driver for v1.24.0+ May 10, 2022
@k8s-ci-robot k8s-ci-robot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label May 10, 2022
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May 10 02:34:53.338: INFO: externalsvc-72bcl[services-5001].container[externalsvc]=failed to create containerd task: failed to create shim task: OCI runtime create failed: runc create failed: unable to start container process: unable to apply cgroup configuration: failed to write 84042: write /sys/fs/cgroup/rdma/kubelet.slice/kubelet-kubepods.slice/kubelet-kubepods-besteffort.slice/kubelet-kubepods-besteffort-podbd0b7b96_aa32_4e00_8323_6f20dd1b85a4.slice/cri-containerd-6e1a4e9c43aba1945e9a28e410939e0801c180fa69bb1850018c9c0b2956a91a.scope/cgroup.procs: no such device: unknown

we still have the rdma issue https://prow.k8s.io/view/gs/kubernetes-jenkins/pr-logs/pull/kubernetes-sigs_kind/2737/pull-kind-conformance-parallel-ipv6/1523846989832261632

but that's not new
/retest

@BenTheElder BenTheElder removed the area/provider/podman Issues or PRs related to podman label May 10, 2022
aojea
aojea reviewed May 10, 2022
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pkg/build/nodeimage/containerd.go
SystemdCgroup = false
`

func configureContainerdSystemdCgroupFalse(containerCmdr exec.Cmder, config string) error {
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can this fail against an image that was built for 1.24.x with an old version of kind, without the containerd change?

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yes, users that upgrade to kind v0.13 will need to use an image built with a newer version
we have no official images that way.

for custom built images that are 1.24+ with kind < v0.13, users will need to build new images. we'll have a release note.

the opposite is also true, 1.24+ official images / images built going forward will require v0.13.

this already would have happened in 1.21 with kubeadm defaulting to systemd then, we just shifted it a few releases.

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/retest

we have report that macOS / docker desktop works fine https://kubernetes.slack.com/archives/CEKK1KTN2/p1652192992627339?thread_ts=1652149847.653599&cid=CEKK1KTN2
/hold cancel

@k8s-ci-robot k8s-ci-robot removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label May 10, 2022
@BenTheElder BenTheElder mentioned this pull request May 10, 2022
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aojea commented May 10, 2022

/lgtm

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label May 10, 2022
@k8s-ci-robot k8s-ci-robot merged commit 181dc20 into kubernetes-sigs:main May 10, 2022
@BenTheElder BenTheElder deleted the systemd-driver branch May 10, 2022 17:50
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Working on v0.13.0 based on this, pushing images. Wrote release notes.

@BenTheElder BenTheElder mentioned this pull request May 10, 2022
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https://github.com/kubernetes-sigs/kind/releases/tag/v0.13.0

@aojea aojea mentioned this pull request May 13, 2022
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@orelmisan orelmisan mentioned this pull request Nov 10, 2022
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