Phase 2 of node allocatable by vishh · Pull Request #348 · kubernetes/community

vishh · 2017-02-09T00:19:18Z

cc @kubernetes/sig-node-proposals

I plan on implementing the 2nd phase mentioned in this proposal while this PR gets reviewed.

cc @adityakali @Amey-D Take a look at the cgroup configuration mentioned in this proposal. We need to alter COS cgroup hierarchies

adityakali · 2017-02-09T00:35:49Z

/cc @wonderfly

derekwaynecarr · 2017-02-09T00:47:24Z

At a high level, this looks ok for phase 2.

I would like more detail on the following:

eviction at kubepods.slice and not just root
it's useful if each new cgroup could have output in summary stats API. Especially for what held the user workload
clarify that cgroup created by kubelet is cgroup driver specific. So /kubepods would become kubepods.slice
Agree defaulting to pods only is good for 1.6
a blurb on containerized kubelet would probably be appreciated by others

Will do a detailed pass tomorrow.

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

vishh · 2017-02-09T03:20:11Z

Thanks for the quick review. I have updated the PR to address your comments. PTAL.
Not all these issues are relevant for v1.6 and so I request focussing initially on work items necessary for v1.6.

vishh · 2017-02-09T03:20:30Z

cc @dashpole @rkouj

sjenning · 2017-02-09T17:01:32Z

contributors/design-proposals/node-allocatable.md

-reservation grows), or running multiple Kubelets on a single node.
+Kubernetes nodes typically run many OS system daemons in addition to kubernetes daemons like kubelet, runtime, etc. and user pods.
+Kubernetes assumes that all the compute resources available, referred to as `Capacity`, in a node are available for user pods.
+In reality, system daemons use non-trivial amoutn of resources and their availability is critical for the stability of the system.


s/amoutn/amount/

sjenning · 2017-02-09T17:46:57Z

contributors/design-proposals/node-allocatable.md

+1. It's resource consumption is tied to the number of pods running on a node.
+
+Note that the hierarchy below recommends having dedicated cgroups for kubelet and the runtime to individally track their usage.
+


probably meant to put this section below in a code block

Oops yeah. Fixed it

sjenning · 2017-02-09T17:50:03Z

contributors/design-proposals/node-allocatable.md

+.	 .	  .        .tasks(container processes)
+.	 .	  .
+.	 .        +..PodOverhead
+.	 .        .        .tasks(per-pod processes)


seems like this would take docker-level support for putting all pause container processes in a single cgroup, if that is indeed what this PodOverhead cgroup is for.

nevermind, i see now that PodGuarenteed is not a literal name, but a placeholder for the pod-level cgroup.

Not necessary. Each pod overhead process can be in its own cgroup too which might be helpful for tracking and terminating purposes.

sjenning · 2017-02-09T18:34:02Z

contributors/design-proposals/node-allocatable.md

+.	 .	  .
+. 	 .	  ...
+
+`systemreserved` & `kubereserved` cgroups are expected to be created by users. If Kubelet is creating cgroups for itself and docker daemon, it will create the `kubereserved` cgroup automatically.


So... the kubelet is creating a cgroup and putting itself in it? Then moving the docker daemon or containerd to that cgroup as well?

Yeah. Kubelet does this to support older distros. This is legacy behavior.

derekwaynecarr

i want to push a little harder to see if we can get some way of reporting pressure relative to allocatable capacity.

derekwaynecarr · 2017-02-09T18:04:30Z

contributors/design-proposals/kubelet-eviction.md

 On the other hand, the `DiskPressure` condition if true should dissuade the scheduler from
 placing **any** new pods on the node since they will be rejected by the `kubelet` in admission.

+## Enforcing Node Allocatable


is this intended for this pr? node allocatable for 1.6 is not local storage aware? i would expect this to be local storage pr.

never mind, i see the reference below.

derekwaynecarr · 2017-02-09T18:09:12Z

contributors/design-proposals/node-allocatable.md

+.	     .tasks(docker-engine, containerd)
+.	 
+.
+..kubepods or kubepods.slice (Node Allocatable enforced here by Kubelet)


it would be nice if we call out that this is dynamically created on kubelet startup whereas the others need to be pre-provision in the OS image.

i see the note below that says the same, so ignore above.

derekwaynecarr · 2017-02-09T18:13:59Z

contributors/design-proposals/node-allocatable.md

+
+### Phase 2 - Enforce Allocatable on Pods
+
+**Status**: Targetted for v1.6


typo: Targeted

derekwaynecarr · 2017-02-09T18:22:26Z

contributors/design-proposals/node-allocatable.md

+.	 .	  .
+. 	 .	  ...
+
+`systemreserved` & `kubereserved` cgroups are expected to be created by users. If Kubelet is creating cgroups for itself and docker daemon, it will create the `kubereserved` cgroup automatically.


we need to check that systemreserved and kubereserved address distinct non-overlapping parts of the cgroup tree. should error if we observe that one covers the other.

derekwaynecarr · 2017-02-09T19:18:42Z

contributors/design-proposals/node-allocatable.md

+
+In this phase, Kubelet will expose usage metrics for `KubeReserved`, `SystemReserved` and `Allocatable` top level cgroups via Summary metrics API.
+`Storage` will also be introduced as a reservable resource in this phase.
+Support for evictions based on Allocatable will be introduced in this phase.


i am a little worried that doing this separately will cause problems. basically, things will just get OOM killed and never moved when utilization starts to reach allocatable for memory. it seems like memory pressure not being reported back to the scheduler for allocatable is a step back.

Thinking about this more, users could set their eviction thresholds higher to cover system+kube reserved in the interim.

it seems like memory pressure not being reported back to the scheduler for allocatable is a step back.

That's true. We need to prevent new pods from being scheduled. But look below.

Thinking about this more, users could set their eviction thresholds higher to cover system+kube reserved in the interim.

Let's assume the following:

user sets their eviction thresholds to say 85%

they enforce SystemReserved & KubeReserved which are set to 5% each.

System and kube components use upto capacity.

Hence allocatable is 90%.

Pods cannot use more than 75% of the memory. If they use more than that, they will be evicted anyways.

Given that do we have to do anything extra? Am I missing something?

I feel eviction thresholds limit the available capacity on the nodes for pods. If a node only runs Guaranteed pods, today, they cannot use upto Allocatable if user space evictions are turned on and that worries me.

vishh · 2017-02-10T05:23:06Z

Posted kubernetes/kubernetes#41234 to implement Phase 2 mentioned in this proposal.

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

dashpole · 2017-02-10T22:07:13Z

contributors/design-proposals/node-allocatable.md

+To improve the reliability of nodes, kubelet evicts pods whenever the node runs out of memory or local storage.
+Together, evictions and node allocatable help improve node stability.
+
+As of v1.5, evictions are based on `Capacity` (overall node usage). Kubelet evicts pods based on QoS and user configured eviction thresholds.


Not sure what the "(overall node usage)" is trying to clarify.
Possibly rephrase: evictions are based on overall node usage relative to Capacity

dashpole · 2017-02-10T22:09:14Z

contributors/design-proposals/kubelet-eviction.md

+Once Kubelet supports `storage` as an `Allocatable` resource, Kubelet will perform evictions whenever the total storage usage by pods exceed node allocatable.
+
+The trigger threshold for storage evictions will not be user configurable for the purposes of `Allocatable`.
+Kubelet will evict pods once the `storage` usage is greater than or equal to `98%` of `Allocatable`.


I realize this is an implementation detail, but what are we trying to protect against by setting the threshold to 98%? Why not 100%, since the overall node is protected by the eviction-hard threshold?

Yes. That makes sense!

I also think we should consider reusing the minimum reclaim value here. In theory, the value should be configured to reduce hitting the same threshold in quick succession. In my estimation, this should be the same, regardless of which threshold is being hit. Under what circumstances would anyone want the allocation-min-reclaim to be different from eviction-min-reclaim?

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

calebamiles · 2017-02-14T18:23:24Z

cc: @ethernetdan

Signed-off-by: Vishnu kannan <vishnuk@google.com>

vishh · 2017-02-14T21:04:26Z

@derekwaynecarr Updated PR based on sig-node discussion.

vishh · 2017-02-15T19:50:40Z

@derekwaynecarr can I get an approval on this PR?

derekwaynecarr · 2017-02-16T03:40:07Z

@vishh it's priority #1 to review this tomorrow am.

…

On Wed, Feb 15, 2017 at 2:50 PM Vish Kannan ***@***.***> wrote: @derekwaynecarr <https://github.com/derekwaynecarr> can I get an approval on this PR? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#348 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AF8dbJ8NxlsPbXre4e-1Ipogio9rU3zcks5rc1cTgaJpZM4L7i0R> .

derekwaynecarr

I agree with 99% of this proposal. See comments and fix typos.

derekwaynecarr · 2017-02-16T03:43:51Z

contributors/design-proposals/kubelet-eviction.md

+Kubelet will evict pods until it can reclaim `5%` of `storage Allocatable`, thereby brining down usage to `95%` of `Allocatable`.
+These thresholds apply for both storage `capacity` and `inodes`.
+
+*Note that these values are subject to change based on feedback from production.*


My two cents is that this text is premature pending agreement on the local storage proposal. Can we remove this text and just state in the future storage will be a part of allocatable. I am not able to agree at this time on lack of configuration and it's also not a planned 1.6 feature.

derekwaynecarr · 2017-02-16T03:45:15Z

contributors/design-proposals/node-allocatable.md

+By explicitly reserving compute resources, the intention is to avoid overcommiting the node and not have system daemons compete with user pods.
+The resources available to system daemons and user pods will be capped based on user specified reservations.
+
+If `Allocatable` is available, the scheduler use that instead of `Capacity`, thereby not overcommiting the node.


Will use that....

derekwaynecarr · 2017-02-16T03:45:56Z

contributors/design-proposals/node-allocatable.md

-together in the `/system` raw container).
+together in the `/system` raw container on non-systemd nodes).
+
+## Kubelet Evictions Tresholds


Typo on threshold

derekwaynecarr · 2017-02-16T03:46:41Z

contributors/design-proposals/node-allocatable.md

+Kubelet evicts pods based on QoS and user configured eviction thresholds.
+More deails in [this doc](./kubelet-eviction.md#enforce-node-allocatable)
+
+From v1.6, if `Allocatable` is enforced by default across all pods on a node using cgroups, pods cannot to exceed `Allocatable`.


Cannot exceed allocatable

derekwaynecarr · 2017-02-16T03:48:48Z

contributors/design-proposals/node-allocatable.md

+
+If we enforce Node Allocatable (`28.9Gi`) via top level cgroups, then pods can never exceed `28.9Gi` in which case evictions will not be performed unless kernel memory consumption is above `100Mi`.
+
+In order to support evictions and avoid memcg OOM kills for pods, we will set the top level cgroup limits for pods to be `Node Allocatable` + `Eviction Hard Tresholds`.


Typo on thresholds

derekwaynecarr · 2017-02-16T03:50:45Z

contributors/design-proposals/node-allocatable.md

+1. A container runtime on Kubernetes nodes is not expected to be used outside of the Kubelet.
+1. It's resource consumption is tied to the number of pods running on a node.
+
+Note that the hierarchy below recommends having dedicated cgroups for kubelet and the runtime to individally track their usage.


Typo individually

derekwaynecarr · 2017-02-16T03:52:09Z

contributors/design-proposals/node-allocatable.md

+
+```
+
+`systemreserved` & `kubereserved` cgroups are expected to be created by users. If Kubelet is creating cgroups for itself and docker daemon, it will create the `kubereserved` cgroups automatically.


Can you add text clarifying how users communicate to kubelet the cgroups that were preconfigured?

derekwaynecarr · 2017-02-16T03:54:02Z

contributors/design-proposals/node-allocatable.md

+	* If `--cgroups-per-qos=false`, then this flag has to be set to `""`. Otherwise its an error and kubelet will fail.
+	* It is recommended to drain and restart nodes prior to upgrading to v1.6. This is necessary for `--cgroups-per-qos` feature anyways which is expected to be turned on by default in `v1.6`.
+	* Users intending to turn off this feature can set this flag to `""`.
+	* Specifying `kube-reserved` value in this flag is invalid if `--kube-reserved-cgroup` flag is not specified.


Is the syntax for this flag driver specific?

No. Its expected to be an absolute cgroupfs path.

derekwaynecarr · 2017-02-16T03:54:46Z

contributors/design-proposals/node-allocatable.md

+	* It is recommended to drain and restart nodes prior to upgrading to v1.6. This is necessary for `--cgroups-per-qos` feature anyways which is expected to be turned on by default in `v1.6`.
+	* Users intending to turn off this feature can set this flag to `""`.
+	* Specifying `kube-reserved` value in this flag is invalid if `--kube-reserved-cgroup` flag is not specified.
+	* Specifying `system-reserved` value in this flag is invalid if `--system-reserved-cgroup` flag is not specified.


Same question here: do I say system.slice or /system?

See clarifying text below.

derekwaynecarr · 2017-02-16T03:56:40Z

contributors/design-proposals/node-allocatable.md

+2. `--kube-reserved-cgroup=<absolute path to a cgroup>`
+   * This flag helps kubelet identify the control group managing all kube components like Kubelet & container runtime that fall under the `KubeReserved` reservation.
+
+3. `--system-reserved-cgroup=<absolute path to a cgroup>`


I wish we could do a sensible default value here. /system is almost universally wrong

Defaulting SGTM. It will help with metrics collection. I'd tackle that in v1.7 once all the distro owners digest this proposal.

wonderfly · 2017-02-16T23:31:33Z

Overall looks good to me.

Signed-off-by: Vishnu kannan <vishnuk@google.com>

vishh · 2017-02-17T21:37:10Z

@derekwaynecarr PTAL

vishh · 2017-02-17T21:37:20Z

@wonderfly thanks for the quick review

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

vishh · 2017-02-20T23:18:59Z

I added another flag to help with the rollout of the changes in this PR. Specifically, it helps ignore Hard Eviction thresholds while computing Node Allocatable.

vishh · 2017-02-20T23:19:15Z

@derekwaynecarr Can I get an LGTM on this PR?

derekwaynecarr

The new flag makes sense since it reduces allocatable.

derekwaynecarr · 2017-02-21T01:41:45Z

contributors/design-proposals/node-allocatable.md

+   * This flag helps kubelet identify the control group managing all OS specific system daemons that fall under the `SystemReserved` reservation.
+   * Example: `/system.slice`. Note that absolute paths are required and systemd naming scheme isn't supported.
+
+4. `--experimental-node-allocatable-ignore-eviction-threshold`


makes sense

derekwaynecarr · 2017-02-21T01:44:51Z

/lgtm
/approve

vishh · 2017-02-21T05:41:21Z

Merging this PR based on LGTM.

@dashpole

Automatic merge from submit-queue Enforce Node Allocatable via cgroups This PR enforces node allocatable across all pods using a top level cgroup as described in kubernetes/community#348 This PR also provides an option to enforce `kubeReserved` and `systemReserved` on user specified cgroups. This PR will by default make kubelet create top level cgroups even if `kubeReserved` and `systemReserved` is not specified and hence `Allocatable = Capacity`. ```release-note New Kubelet flag `--enforce-node-allocatable` with a default value of `pods` is added which will make kubelet create a top level cgroup for all pods to enforce Node Allocatable. Optionally, `system-reserved` & `kube-reserved` values can also be specified separated by comma to enforce node allocatable on cgroups specified via `--system-reserved-cgroup` & `--kube-reserved-cgroup` respectively. Note the default value of the latter flags are "". This feature requires a **Node Drain** prior to upgrade failing which pods will be restarted if possible or terminated if they have a `RestartNever` policy. ``` cc @kubernetes/sig-node-pr-reviews @kubernetes/sig-node-feature-requests TODO: - [x] Adjust effective Node Allocatable to subtract hard eviction thresholds - [x] Add unit tests - [x] Complete pending e2e tests - [x] Manual testing - [x] Get the proposal merged @dashpole is working on adding support for evictions for enforcing Node allocatable more gracefully. That work will show up in a subsequent PR for v1.6

@vishh

Automatic merge from submit-queue Eviction Manager Enforces Allocatable Thresholds This PR modifies the eviction manager to enforce node allocatable thresholds for memory as described in kubernetes/community#348. This PR should be merged after #41234. cc @kubernetes/sig-node-pr-reviews @kubernetes/sig-node-feature-requests @vishh ** Why is this a bug/regression** Kubelet uses `oom_score_adj` to enforce QoS policies. But the `oom_score_adj` is based on overall memory requested, which means that a Burstable pod that requested a lot of memory can lead to OOM kills for Guaranteed pods, which violates QoS. Even worse, we have observed system daemons like kubelet or kube-proxy being killed by the OOM killer. Without this PR, v1.6 will have node stability issues and regressions in an existing GA feature `out of Resource` handling.

Phase 2 of node allocatable

The kubelet will terminate end-user pods when the worker node has 'MemoryPressure' according to [1]. But confusingly, there exits two reasons for pods being evicted: - one is the whole machine's free memory is too low, - the other is k8s itself calculation[2], e.i. memory.available[3] is too low. To resolve such confusion for k8s users, collect and show k8s global workingset memory to distinguish between these two causes. Note: 1. Only collect k8s global memory stats is enough, this is because cgroupfs stats are propagated from child to parent. Thus the parent can always notice the change and then updates. And From v1.6 k8s[4], allocatable(/sys/fs/cgroup/memory/kubepods/) is more convincing than capacity(/sys/fs/cgroup/memory/). 2. There are two cgroup drivers or managers to control resources: cgroupfs and systemd[5]. We should take both into account. (The 'systemd' cgroup driver always ends with '.slice') 3. The difference between cgroupv1 and cgroupv2: different field names for memory.stat file, and memory.currentUsage storing in different files (cgv1's memory.usage_in_bytes v.s. cgv2's memory.current). [1]https://kubernetes.io/docs/concepts/scheduling-eviction/node-pressure-eviction/#node-out-of-memory-behavior [2]kubernetes/kubernetes#43916 [3]memory.available = memory.allocatable/capacity - memory.workingSet, memory.workingSet = memory.currentUsage - memory.inactivefile [4]kubernetes/kubernetes#42204 kubernetes/community#348 [5]https://kubernetes.io/docs/tasks/administer-cluster/kubeadm/configure-cgroup-driver/ Signed-off-by: Fei Li <lifei.shirley@bytedance.com> Reported-by: Teng Hu <huteng.ht@bytedance.com>

vishh assigned derekwaynecarr Feb 9, 2017

vishh requested review from dchen1107 and derekwaynecarr February 9, 2017 00:19

k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Feb 9, 2017

vishh force-pushed the node-allocatable branch from 58b8992 to 4668ec4 Compare February 9, 2017 00:25

Phase 2 of node allocatable

0bd5266

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

vishh force-pushed the node-allocatable branch from 4668ec4 to 0bd5266 Compare February 9, 2017 03:17

sjenning reviewed Feb 9, 2017

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derekwaynecarr reviewed Feb 9, 2017

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vishh mentioned this pull request Feb 10, 2017

Enforce Node Allocatable via cgroups kubernetes/kubernetes#41234

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5 tasks

clarify node allocatable in the presence of eviction thresholds

f1d5e24

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

vishh force-pushed the node-allocatable branch from 90950d6 to f1d5e24 Compare February 10, 2017 18:56

dashpole reviewed Feb 10, 2017

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vishh and others added 5 commits February 10, 2017 14:57

add evictions based on node allocatable cgroup usage

e16e482

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

adjust storage allocatable enforcement to run at 100% of allocatable

37b5373

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

fix nits

bc9c4c1

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

Fix formatting

94ce3d9

Rename kubesystem to podruntime

6a72d51

control kubepods cgroup using cgroups-per-qos flag

04b8f20

Signed-off-by: Vishnu kannan <vishnuk@google.com>

derekwaynecarr suggested changes Feb 16, 2017

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dashpole mentioned this pull request Feb 17, 2017

[Proposal] Eviction Soft is Relative to Hard Eviction Threshold(s) #380

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fix typos in node-allocatable proposal

a871e58

Signed-off-by: Vishnu kannan <vishnuk@google.com>

vishh mentioned this pull request Feb 20, 2017

MostRequestedPriority should prefer to not pack nodes to 100% kubernetes/kubernetes#41712

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adding a flag to opt-out of node allocatable calculation changes

91368a6

Signed-off-by: Vishnu Kannan <vishnuk@google.com>

derekwaynecarr approved these changes Feb 21, 2017

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k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Feb 21, 2017

vishh merged commit 7a444fa into kubernetes:master Feb 21, 2017

dashpole mentioned this pull request Feb 28, 2017

Eviction Manager Enforces Allocatable Thresholds kubernetes/kubernetes#42204

Merged

MadhavJivrajani pushed a commit to MadhavJivrajani/community that referenced this pull request Nov 30, 2021

Merge pull request kubernetes#348 from vishh/node-allocatable

eecc04f

Phase 2 of node allocatable

		1. It's resource consumption is tied to the number of pods running on a node.

		Note that the hierarchy below recommends having dedicated cgroups for kubelet and the runtime to individally track their usage.


		### Phase 2 - Enforce Allocatable on Pods

		Status: Targetted for v1.6


		If we enforce Node Allocatable (`28.9Gi`) via top level cgroups, then pods can never exceed `28.9Gi` in which case evictions will not be performed unless kernel memory consumption is above `100Mi`.

		In order to support evictions and avoid memcg OOM kills for pods, we will set the top level cgroup limits for pods to be `Node Allocatable` + `Eviction Hard Tresholds`.


		```

		`systemreserved` & `kubereserved` cgroups are expected to be created by users. If Kubelet is creating cgroups for itself and docker daemon, it will create the `kubereserved` cgroups automatically.

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vishh commented Feb 10, 2017

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vishh commented Feb 9, 2017 •

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