PLEG is not healthy #61117

albertvaka · 2018-03-13T16:07:41Z

Is this a BUG REPORT or FEATURE REQUEST?:

/kind bug

What happened:

I had a node missbehaving. journal of the kubelet showed this:

Mar 13 16:02:43 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:02:43.934473    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m5.30015447s ago; threshold is 3m0s]
Mar 13 16:02:48 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:02:48.934773    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m10.30056416s ago; threshold is 3m0s]
Mar 13 16:02:53 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:02:53.935030    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m15.300823802s ago; threshold is 3m0s]
Mar 13 16:02:58 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:02:58.935306    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m20.301094771s ago; threshold is 3m0s]
Mar 13 16:03:03 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:03:03.940675    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m25.306459083s ago; threshold is 3m0s]
Mar 13 16:03:08 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:03:08.940998    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m30.306781014s ago; threshold is 3m0s]
Mar 13 16:03:13 vk-prod4-node-v18-w3fz kubelet[1450]: I0313 16:03:13.941284    1450 kubelet.go:1778] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 3m35.307062566s ago; threshold is 3m0s]

Environment:

Kubernetes version (use kubectl version): 1.8.8
Cloud provider or hardware configuration: GCE
OS (e.g. from /etc/os-release): Ubuntu 16.04.3 LTS
Kernel (e.g. uname -a): 4.13.0-1011-gcp
Install tools: kubeadm
Others:
- Docker Version: 1.12.6-cs13
- I'm using calico for networking

The text was updated successfully, but these errors were encountered:

albertvaka · 2018-03-13T16:10:16Z

/sig node

andrewrynhard · 2018-05-07T16:34:44Z

@albertvaka Was this bug fixed, or why was the issue closed? I am seeing the same thing.

oivindoh · 2018-05-08T11:21:34Z

also just had this wonderful experience (with calico 2.6) on one of my nodes in Azure

@albertvaka probably abandoned it in favour of #45419

whereisaaron · 2018-07-12T14:32:11Z

@albertvaka out of memory on a node can cause this, and when it happens the node can't update its own node status to say so. You might find the hyperkube process has leaked to use multiple GB of RAM. This might not be your problem but one idea to check.

adampl · 2018-08-28T14:05:40Z

In my case (Kubernetes 1.11.1) the problem is not caused by insufficient amount of free memory.

sfgroups-k8s · 2018-11-30T02:03:01Z

I am getting same error message on centos 7 node, its has lot of free memory.

Reason:KubeletNotReady Message:PLEG is not healthy: pleg was last seen active 3m2.007756043s ago; threshold is 3m0s}

ArjunSureshKumar92 · 2018-12-20T20:13:09Z

@grailsweb Did you find a solution? Having the same issue in aks v1.11.

ghost · 2019-01-07T19:37:35Z

Kubelet 1.12.3.

Have met this issue, not a memory problem. Will try to fit this on an open issue somewhere.

maheshmadpathi · 2019-03-26T08:57:17Z

Has this been fixed? we have the same issue with v1.12.0. Node Memory isn't a problem.

javafoot · 2019-04-12T08:17:05Z

I have the same issue on K8S v1.10.11 with health CPU, memory and disk.
v1.10.11 CentOS Linux 7 (Core) 3.10.0-862.14.4.el7.x86_64 docker://1.13.1
Docker works normally by running "docker ps or info".

By this way, the issue is fixed temporarily.

After restarting docker deamon, there was no container running, meanwhile, kubelet logs kept printing:
kubelet[788387]: W0412 00:46:38.054829 788387 pod_container_deletor.go:77] Container "621a89ecc8d299773098d740cf9057602df1f67aba6ba85b7cae88701a9b4b06" not found in pod's containers
kubelet[567286]: I0411 22:44:11.526244 567286 kubelet.go:1803] skipping pod synchronization - [PLEG is not healthy: pleg was last seen active 2h8m28.080201738s ago; threshold is 3m0s]

It gave me light ---- I may delete "/var/lib/kubelet/pods/*".
/var/lib/kubelet/pods/9a954722-5c0c-11e9-91fc-005056bd5f06:
containers etc-hosts plugins volumes

Step1. Stop kubelet
Step2. Remove pods, but the volume folders can't be removed at all:
rm -rf /var/lib/kubelet/pods/*
rm: cannot remove \u2018/var/lib/kubelet/pods/084cf8bd-5cd4-11e9-ad28-005056bd5f06/volumes/kubernetes.io~secret/default-token-c2xc7\u2019: Device or resource busy

Step3. Start kubelet

"docker ps" could list the containers.

The node came back to the "Ready" state.

gridworkz · 2019-04-15T21:05:27Z

Thanks for this - I lost two nodes over the weekend - flapping. I'll try this next time it happens. I've also brought this up with the folks at OpenEBS just to notify them. They never heard of it. (not an OpenEBS issue but I know some guys over there who are much smarter than me).

MohammedFadin · 2019-06-18T12:06:40Z

I'm having the exact same issue on IBM Cloud Kubernetes as well.

gridworkz · 2019-06-18T14:31:08Z

It seems to happen to me when I have too many application instances running and too few nodes. It doesn't matter what the size of the nodes are. I have a simple 3 node test cluster going. I create one project/namespace and run one instance of Odoo - all good. I add a few more instances of Odoo and after a week or so I'm plagued with pleg. My nodes are beefy too. This has happened on Upcloud, Hetzner and Digital Ocean.

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On Tue, Jun 18, 2019 at 8:08 AM Mohammed S Fadin ***@***.***> wrote: I'm having the exact same issue on IBM Cloud Kubernetes as well. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#61117?email_source=notifications&email_token=AEVXNSGFBNV5VNNCKIWLIW3P3DF5VA5CNFSM4EVD4O72YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGODX6FDQA#issuecomment-503075264>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AEVXNSAHJI5RRB2Y2FZJHD3P3DF5VANCNFSM4EVD4O7Q> .

cshivashankar · 2020-06-26T11:54:40Z

Is this issue resolved?
I am getting PLEG issues in my cluster and observed this open issue.
Is there any workaround for this?

billysutomo · 2020-08-19T12:30:47Z

I also got this issue. My cause is memory leak. I don't know how, but collectd got memory leak and eat my memory resources until 20GB and leave no resource for my kubernetes deployment. After check, i got Nodes not ready.

TheKangaroo · 2020-08-26T16:16:27Z

I see this issue on 1.17.6, with lots of free RAM on the host

free -g
              total        used        free      shared  buff/cache   available
Mem:             15           3           3           0           8          11
Swap:             0           0           0

wwyhy · 2020-10-23T02:36:00Z

i got same issue on centos 7.6 with k8s 1.13.12 and docker 18.06.2-ce. it cause node reday/notready intermittently.
Reason:KubeletNotReady Message:PLEG is not healthy: pleg was last seen active 3m2.007756043s ago; threshold is 3m0s}

gautamsoni17990 · 2021-04-12T16:08:15Z

i am also facing the same issue on latest kubelet version which is 1.20.5 and still getting this error, there is no issue related to memory because i have not use any application till yet.

gridworkz · 2021-04-12T17:20:17Z

btw: Where are you hosting your servers?

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On Mon, Apr 12, 2021 at 12:08 PM gautamsoni17990 ***@***.***> wrote: i am also facing the same issue on latest kubelet version which is 1.20.5 and still getting this error, there is no issue related to memory because i have not use any application till yet. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSDX3VB7CNYQRQ53FIDTIMLIFANCNFSM4EVD4O7Q> .

rdxmb · 2021-04-27T16:16:48Z

Can this be opened or is there a new issue for that? The problem can actually be found on several systems like aws, rancher etc
rancher/rancher#31793

EDIT: #101056

nswarnkar · 2021-04-30T16:39:42Z

"PLEG is not healthy: pleg was last seen active 17m16.107709513s ago; threshold is 3m0s"

I am still facing this issue. This is fluctuating. Because of this some pods get stuck. I am also using Cluster Autoscaler, which starts adding node, once pods are not scheduled because of this node in error.

Any help or clue?

gridworkz · 2021-04-30T17:00:40Z

Hi: I generally find this issue arises from network / service mesh inadequacy. The network is usually the last place people look - we just assume it's super fast. I've tried a myriad of configurations across many providers, local clusters etc., and this issue is common across all setups. The only common denominator in all these setups is the underlying network. Now, when I set up a K8 provider service like DO or Google Cloud I never run into this issue (or it's extremely rare). They obviously have the network juice. So, either DO / Google have a different K8 code base than that in the wild or they have infrastructure from hell to mitigate these PLEG type errors. So where does that leave the average bear. Well, that's a tough one. I've had this issue occur even with killer ping times to my nodes. Something occasionally gets lost in transit when the cluster is up and running. To be honest I still think this is a resource issue. For the longest time I thought it was the Docker container version but I've had the cluster go south across many different versions of Docker as well. I know this is not a solution, just many years of observation. My two cents is to look into good service mesh tech and really focus on the underlying network. Cheers, Dave

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On Fri, Apr 30, 2021 at 12:40 PM Neeraj Swarnkar ***@***.***> wrote: "PLEG is not healthy: pleg was last seen active 17m16.107709513s ago; threshold is 3m0s" I am still facing this issue. This is fluctuating. Because of this some pods get stuck. I am also using Cluster Autoscaler, which starts adding node, once pods are not scheduled because of this node in error. Any help or clue? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSDCYX7BRJNSGSZQ7ITTLLMONANCNFSM4EVD4O7Q> .

gridworkz · 2021-05-05T19:48:42Z

I was afraid of that. It looks like we'll need to tweak things via ConfgMap. Interesting though that a bigger box worked in the past. This is straight-up a resource/timing issue. The trick is to find which resource is falling over. Since all the usual suspects look fine, it's likely the Docker/Kubelet interaction (it pumps out these types of errors). Your IP pool is large enough so it couldn't be that. I recommend trying to get a dump of the current kubelet config outlined in the second link I sent. Hopefully you have enough permission for that.

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On Wed, May 5, 2021 at 3:34 PM Neeraj Swarnkar ***@***.***> wrote: https://www.ibm.com/docs/en/cloud-paks/cp-management/1.1.0?topic=mmcpt-slow-interaction-between-kubelet-docker-cause-pleg-issues I could not try this, as I think it needs node root access to do it, which I dont have now. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSA7QHSXCT75XY3YRGTTMGMS5ANCNFSM4EVD4O7Q> .

gridworkz · 2021-05-05T20:29:49Z

Just a note: Two chart items you should be looking at in your Netdata PLEG Relisting Interval Summary in microseconds PLEG Relisting Latency Summary in microseconds To check your Kubelet metrics you can go to: https://127.0.0.1:10250/metrics POD Relist needs to complete in 3 minutes or it barfs. There may be too many pods on the node for relist to complete in 3 minutes. The number of events and latency is proportional to the number of pods, independent of node resources.

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On Wed, May 5, 2021 at 3:48 PM Dave Cook ***@***.***> wrote: I was afraid of that. It looks like we'll need to tweak things via ConfgMap. Interesting though that a bigger box worked in the past. This is straight-up a resource/timing issue. The trick is to find which resource is falling over. Since all the usual suspects look fine, it's likely the Docker/Kubelet interaction (it pumps out these types of errors). Your IP pool is large enough so it couldn't be that. I recommend trying to get a dump of the current kubelet config outlined in the second link I sent. Hopefully you have enough permission for that. On Wed, May 5, 2021 at 3:34 PM Neeraj Swarnkar ***@***.***> wrote: > > https://www.ibm.com/docs/en/cloud-paks/cp-management/1.1.0?topic=mmcpt-slow-interaction-between-kubelet-docker-cause-pleg-issues > I could not try this, as I think it needs node root access to do it, > which I dont have now. > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub > <#61117 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AEVXNSA7QHSXCT75XY3YRGTTMGMS5ANCNFSM4EVD4O7Q> > . >

nswarnkar · 2021-05-05T21:40:14Z

I will check, But I am in complete agreement with your assessment. Because when PLEG issue comes, I saw the pods, though working perfectly, have their status "unknown". The moment, I remove the stuck pod, they status becomes "green" i.e. active.

nswarnkar · 2021-05-05T21:46:15Z

I tried this command:
kubectl get no ${NODE_NAME} -o json | jq '.status.config'

It returns null.

I checked kubectl version

kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:56:40Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"19", GitVersion:"v1.19.8", GitCommit:"fd5d41537aee486160ad9b5356a9d82363273721", GitTreeState:"clean", BuildDate:"2021-02-17T12:33:08Z", GoVersion:"go1.15.8", Compiler:"gc", Platform:"linux/amd64"}

gridworkz · 2021-05-05T22:03:44Z

Try adding -n <namespace name> to the command. Namespace is probably kube-system

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On Wed, May 5, 2021 at 5:46 PM Neeraj Swarnkar ***@***.***> wrote: I tried this command: kubectl get no ${NODE_NAME} -o json | jq '.status.config' It returns null. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSDEZ65DKZY6QU3V2B3TMG4DTANCNFSM4EVD4O7Q> .

nswarnkar · 2021-05-05T22:09:46Z

I saw the logs of metric server and found line like:
E0503 18:34:06.511772 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:35:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:36:06.507504 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:37:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:38:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:39:06.507403 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 18:39:48.455646 1 reststorage.go:135] unable to fetch node metrics for node "ip-10-0-32-228.ap-northeast-1.compute.internal": no metrics known for node
E0503 18:40:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded
E0503 19:22:06.507434 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded

gridworkz · 2021-05-05T22:17:02Z

Interesting - what network plugin are you using? (Canal / Calico or other)

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On Wed, May 5, 2021 at 6:10 PM Neeraj Swarnkar ***@***.***> wrote: I saw the logs of metric server and found line like: E0503 18:34:06.511772 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:35:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:36:06.507504 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:37:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:38:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:39:06.507403 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:39:48.455646 1 reststorage.go:135] unable to fetch node metrics for node "ip-10-0-32-228.ap-northeast-1.compute.internal": no metrics known for node E0503 18:40:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 19:22:06.507434 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSF25LPCFMASHZSUXKLTMG63ZANCNFSM4EVD4O7Q> .

gridworkz · 2021-05-06T04:09:44Z

Can you - curl https://10.0.32.228:10250/metrics ? Could be DNS or more likely the scrape_timeout needs to be increased. Know how to do it in Prometheus not sure in Netdata.

…

On Wed, May 5, 2021 at 6:16 PM Dave Cook ***@***.***> wrote: Interesting - what network plugin are you using? (Canal / Calico or other) On Wed, May 5, 2021 at 6:10 PM Neeraj Swarnkar ***@***.***> wrote: > I saw the logs of metric server and found line like: > E0503 18:34:06.511772 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:35:06.507445 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:36:06.507504 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:37:06.507423 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:38:06.507423 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:39:06.507403 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 18:39:48.455646 1 reststorage.go:135] unable to fetch node metrics > for node "ip-10-0-32-228.ap-northeast-1.compute.internal": no metrics known > for node > E0503 18:40:06.507445 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > E0503 19:22:06.507434 1 manager.go:111] unable to fully collect metrics: > unable to fully scrape metrics from source > kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to > fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal > (10.0.32.228): Get > https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: > context deadline exceeded > > — > You are receiving this because you were mentioned. > Reply to this email directly, view it on GitHub > <#61117 (comment)>, > or unsubscribe > <https://github.com/notifications/unsubscribe-auth/AEVXNSF25LPCFMASHZSUXKLTMG63ZANCNFSM4EVD4O7Q> > . >

Adam-Jin · 2021-05-06T09:53:42Z

I had a similar problem with AKS, where the node state switched between Ready and Not Ready. Pleg is not healthy, but the CPU memory consumption is not high. I contacted the Ask product team and they couldn't find Root Causel either. Since our developers frequently create new NS on the cluster and deploy a series of services in it for inheritance, the NS will be deleted at the end. This can happen during deployment.

gridworkz · 2021-05-06T15:01:55Z

Thanks, by NS are you referring to namespaces?

…

On Thu, May 6, 2021 at 5:54 AM AdamJin ***@***.***> wrote: I had a similar problem with AKS, where the node state switched between Ready and Not Ready. Pleg is not healthy, but the CPU memory consumption is not high. I contacted the Ask product team and they couldn't find Root Causel either. Since our developers frequently create new NS on the cluster and deploy a series of services in it for inheritance, the NS will be deleted at the end. This can happen during deployment. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSFBIVCLE2QLDISP2LDTMJRLZANCNFSM4EVD4O7Q> .

nswarnkar · 2021-05-06T18:32:35Z

Try adding -n to the command. Namespace is probably kube-system
…
On Wed, May 5, 2021 at 5:46 PM Neeraj Swarnkar @.***> wrote: I tried this command: kubectl get no ${NODE_NAME} -o json | jq '.status.config' It returns null. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEVXNSDEZ65DKZY6QU3V2B3TMG4DTANCNFSM4EVD4O7Q .

Same output i.e. null

nswarnkar · 2021-05-06T18:37:08Z

curl https://10.0.32.228:10250/metrics

I can call curl -k https://10.0.32.228:10250/metrics

It said unauthorized.

nswarnkar · 2021-05-06T18:39:40Z

Interesting - what network plugin are you using? (Canal / Calico or other)
…
On Wed, May 5, 2021 at 6:10 PM Neeraj Swarnkar @.***> wrote: I saw the logs of metric server and found line like: E0503 18:34:06.511772 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:35:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:36:06.507504 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:37:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:38:06.507423 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:39:06.507403 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 18:39:48.455646 1 reststorage.go:135] unable to fetch node metrics for node "ip-10-0-32-228.ap-northeast-1.compute.internal": no metrics known for node E0503 18:40:06.507445 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded E0503 19:22:06.507434 1 manager.go:111] unable to fully collect metrics: unable to fully scrape metrics from source kubelet_summary:ip-10-0-32-228.ap-northeast-1.compute.internal: unable to fetch metrics from Kubelet ip-10-0-32-228.ap-northeast-1.compute.internal (10.0.32.228): Get https://10.0.32.228:10250/stats/summary?only_cpu_and_memory=true: context deadline exceeded — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEVXNSF25LPCFMASHZSUXKLTMG63ZANCNFSM4EVD4O7Q .

Namespace: kube-system
	Open accordion
	Open accordion

�

nswarnkar · 2021-05-06T18:40:58Z

I found pods running in kube-system:

calico-kube-controllers
and
canal

which CNI plugin is this, not sure, I could see both pods installed.

�

nswarnkar · 2021-05-06T18:46:36Z

As per the logs, I checked canal is being used on all worker and master node.
Interestingly I found that calico-kube-controllers both is deployed on master node only. Is it managing CNI plugins on all nodes?

gridworkz · 2021-05-06T22:34:42Z

OK thanks, looks like a permission thing on /metrics. Here's something to look at: kubernetes-sigs/metrics-server#167 There are some switches that can be sent to kubernetes metrics server.

…

On Thu, May 6, 2021 at 2:46 PM Neeraj Swarnkar ***@***.***> wrote: As per the logs, I checked canal is being used on all nodes. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSFTRRDC5JPYDH4PK63TMLP2FANCNFSM4EVD4O7Q> .

nswarnkar · 2021-05-07T07:41:59Z

kubectl describe apiservice v1beta1.metrics.k8s.io
Name: v1beta1.metrics.k8s.io
Namespace:
Labels:
Annotations: API Version: apiregistration.k8s.io/v1
Kind: APIService
Metadata:
Creation Timestamp: 2021-03-22T11:20:24Z
Resource Version: 1491
Self Link: /apis/apiregistration.k8s.io/v1/apiservices/v1beta1.metrics.k8s.io
UID: f7a1f1a9-b31f-441b-a920-01f57c5a1fdc
Spec:
Group: metrics.k8s.io
Group Priority Minimum: 100
Insecure Skip TLS Verify: true
Service:
Name: metrics-server
Namespace: kube-system
Port: 443
Version: v1beta1
Version Priority: 100
Status:
Conditions:
Last Transition Time: 2021-03-22T11:22:21Z
Message: all checks passed
Reason: Passed
Status: True
Type: Available
Events:

Status of my metric server is all passed.

nswarnkar · 2021-05-07T09:42:59Z

OK thanks, looks like a permission thing on /metrics. Here's something to look at: kubernetes-sigs/metrics-server#167 There are some switches that can be sent to kubernetes metrics server.
…
On Thu, May 6, 2021 at 2:46 PM Neeraj Swarnkar @.***> wrote: As per the logs, I checked canal is being used on all nodes. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEVXNSFTRRDC5JPYDH4PK63TMLP2FANCNFSM4EVD4O7Q .

Same configuration is being used by my metrics serves( same switches)

nswarnkar · 2021-05-07T09:43:19Z

OK thanks, looks like a permission thing on /metrics. Here's something to look at: kubernetes-sigs/metrics-server#167 There are some switches that can be sent to kubernetes metrics server.
…
On Thu, May 6, 2021 at 2:46 PM Neeraj Swarnkar @.***> wrote: As per the logs, I checked canal is being used on all nodes. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEVXNSFTRRDC5JPYDH4PK63TMLP2FANCNFSM4EVD4O7Q .

Same configuration is being used by my metrics serves( same switches)

https://github.com/kubernetes-sigs/metrics-server/releases/latest/download/components.yaml

gridworkz · 2021-05-07T16:30:01Z

Actually, the metrics server config looks OK. Your setup looks fine. I also have setups like this with no problems. None on Amazon. I think we may need to get them involved in this issue. In your case, it appears it might be AWS specific. You may need a higher access level to perform the things we need to do for diagnostics.

As I mentioned earlier, creating PODs incurs overhead (irrespective of resources RAM etc.). Mostly events and latency overhead. It's basically this overhead that's causing your PLEG issues when creating many pods on the cluster. In order to investigate this we need to fine tune things at a lower level, which I believe you don't have the access level to do. This is common with cloud providers as they don't really let you get under the hood. We have this issue a lot with AWS RDS.

If you're budget is constrained I would dig into this deeper with AWS (I think we narrowed down the things they can check in this thread), otherwise I would just increase the server size of your setup.

nswarnkar · 2021-05-07T18:27:16Z

Yes, actually to keep our budget low, we chose such machines. Now I can access the machines with higher access level. What set of debugging information we can collect?
If it is AWS infrastructure issue, we should have enough information to raise ticket on them. If you can guide me, I can collect. Thanks so much for following on this thread and replying me promptly,

gridworkz · 2021-05-07T19:22:32Z

Great! Our original goal was to grab a dump of the current kubelet config so that we can possibly change some parameters to extend the relist timeout via a Configmap.

…

On Fri, May 7, 2021 at 2:27 PM Neeraj Swarnkar ***@***.***> wrote: Yes, actually to keep our budget low, we chose such machines. Now I can access the machines with higher access level. What set of debugging information we can collect? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#61117 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AEVXNSCAXTJMGLRVBQNV76TTMQWJZANCNFSM4EVD4O7Q> .

huangjiasingle · 2021-09-08T20:32:26Z

PLEG not healthy's real reason is not runc lead to，list container from dockerd, dockerd not comunite with runc, not healthy because last succeeded list container's time to now more than 3minute， PLEG list container from docker daemon by labels: all=1&filters={"label":{"io.kubernetes.docker.type=container":true},"status":{"running":true}}, and the docker damon first query containers from containerd, and containerd read go-memdb(memory db) and return containers to daemon, and daemon use the containers to
do for action and then get every container's image info from imagedb dir（usually /var/lib/docker/image/overlay2/imagedb，if use devicemap, the dir is /var/lib/docker/image/devicemap/imageddb）， l think the reason of list container operate more than 3munite imposible occur in memdb， it high probability occur in get container's image info. may be has many container in the node or the node has many processes do io operation and so on.

huangjiasingle · 2021-09-08T20:42:03Z

the list api server of dockerd call link:
github.com/docker/docker/api/server/router/container/container.go initRoutes() > getContainersJSOJ()
github.com/docker/docker/api/server/router/container/container_routes.go getContainersJSOJ() > Containers()
github.com/docker/docker/daemon/list.go Containers() >reduceContainers() >reducePsContainer() > refreshImage()

abhiatmsit · 2021-09-19T09:54:24Z

is this issue fixed in kubernetes version
kubelet restart doesnt help

Client Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.1", GitCommit:"632ed300f2c34f6d6d15ca4cef3d3c7073412212", GitTreeState:"clean", BuildDate:"2021-08-19T15:45:37Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"22", GitVersion:"v1.22.1", GitCommit:"632ed300f2c34f6d6d15ca4cef3d3c7073412212", GitTreeState:"clean", BuildDate:"2021-08-19T15:39:34Z", GoVersion:"go1.16.7", Compiler:"gc", Platform:"linux/amd64"}
root@ubuntu-xenial:~#

i can still see this issue--

Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message

NetworkUnavailable False Sun, 12 Sep 2021 16:04:37 +0000 Sun, 12 Sep 2021 16:04:37 +0000 CalicoIsUp Calico is running on this node
MemoryPressure False Sun, 19 Sep 2021 09:43:17 +0000 Fri, 13 Aug 2021 06:09:37 +0000 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Sun, 19 Sep 2021 09:43:17 +0000 Fri, 13 Aug 2021 06:09:37 +0000 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Sun, 19 Sep 2021 09:43:17 +0000 Fri, 13 Aug 2021 06:09:37 +0000 KubeletHasSufficientPID kubelet has sufficient PID available
Ready False Sun, 19 Sep 2021 09:43:17 +0000 Sun, 19 Sep 2021 06:11:19 +0000 KubeletNotReady PLEG is not healthy: pleg has yet to be successful

root@ubuntu-xenial:~# systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/kubelet.service.d
└─10-kubeadm.conf
Active: active (running) since Sun 2021-09-19 09:49:27 UTC; 2min 57s ago
Docs: https://kubernetes.io/docs/home/
Main PID: 21878 (kubelet)
Tasks: 15
Memory: 77.1M
CPU: 19.599s
CGroup: /system.slice/kubelet.service
└─21878 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --config=/var/lib/kubelet/config.yaml --network-plugin=cni --pod-infra-container-image=k8s.gcr.io/pause:3.5

lines 1-23/23 (END)
root@ubuntu-xenial:# free -mh
total used free shared buff/cache available
Mem: 4.8G 2.1G 266M 76M 2.4G 2.1G
Swap: 0B 0B 0B
root@ubuntu-xenial:#

Sep 19 09:53:47 ubuntu-xenial systemd[1]: Removed slice libcontainer_31792_systemd_test_default.slice.
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230337 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/pids/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): readdirent /sys/fs/cgroup/pids/libcontainer_31792_systemd_test_default.slice: no such file or directory
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230564 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/cpu,cpuacct/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): inotify_add_watch /sys/fs/cgroup/cpu,cpuacct/libcontainer_31792_systemd_test_default.slice: no such file or directory
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230598 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/blkio/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): inotify_add_watch /sys/fs/cgroup/blkio/libcontainer_31792_systemd_test_default.slice: no such file or directory
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230613 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/memory/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): inotify_add_watch /sys/fs/cgroup/memory/libcontainer_31792_systemd_test_default.slice: no such file or directory
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230626 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/devices/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): inotify_add_watch /sys/fs/cgroup/devices/libcontainer_31792_systemd_test_default.slice: no such file or directory
Sep 19 09:53:47 ubuntu-xenial kubelet[21878]: W0919 09:53:47.230636 21878 watcher.go:95] Error while processing event ("/sys/fs/cgroup/pids/libcontainer_31792_systemd_test_default.slice": 0x40000100 == IN_CREATE|IN_ISDIR): inotify_add_watch /sys/fs/cgroup/pids/libcontainer_31792_systemd_test_default.slice: no such file or directory
^C
root@ubuntu-xenial:~#

prbakhsh · 2021-12-06T08:20:20Z

I have the same issue in my bare metal k8s.
k8s version: v1.19.3
cni: weave net

rchunping · 2022-01-09T12:25:22Z

I have the same issue
the worker node is running at
FreeBSD 10.4 -> bhyve -> CentOS 8
Hardware: Dell R420 , E5-2470v2 * 2 + 64G

the problem was caused by broken tsc

kernel: TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'.

upgrade VM host to FreeBSD 11.4 fix the issue.

yileng146 · 2022-04-22T08:13:37Z

I have the same issue
than I just reboot the problem node to solve the problem
shutdown -r now

daemonadmin · 2022-08-15T11:24:28Z

Restarting docker.service resolved this issue for me.

jpaulcristancho · 2023-02-08T21:23:13Z

is this resolved? i have the same issue here

k8s-ci-robot added needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. kind/bug Categorizes issue or PR as related to a bug. labels Mar 13, 2018

k8s-ci-robot added sig/node Categorizes an issue or PR as relevant to SIG Node. and removed needs-sig Indicates an issue or PR lacks a `sig/foo` label and requires one. labels Mar 13, 2018

albertvaka changed the title ~~Kubelet invalid memory address or nil pointer dereference~~ PLEG is not healthy Mar 13, 2018

albertvaka closed this as completed Mar 13, 2018

jnoller mentioned this issue Jun 19, 2019

Nodes goes in Not Ready State after load testing Azure/AKS#102

Closed

thaJeztah mentioned this issue Sep 8, 2020

Docker container runtime 19.3.12 for Kubernetes restarts on its own moby/moby#41385

Closed

PLEG is not healthy #61117

PLEG is not healthy #61117

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Any help or clue?

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nswarnkar commented May 6, 2021 •

edited

nswarnkar commented May 7, 2021 •

edited

nswarnkar commented May 7, 2021 •

edited

huangjiasingle commented Sep 8, 2021 •

edited