support collecting FsUsageMetrics for containerd #2872

yyrdl · 2021-05-19T09:43:00Z

What's added?

Collect container's disk usage metrics for containerd .

Related Issue: Disk usage metrics for containerd #2785

Note:

This pr only report the usage and inode information powered by containerd's standard API. Some disk usage information is missing until there is way to get the id of the snapshot or containerd enhances it's API.But for now, we can report what we can get .

We urgently need the disk usage of the container，these information is ok for our scenario in Tencent ,although it's not complete.

For k8s users, cadvisor is integrated in kubelet , you need to apply these changes to your kubelet (modify cadvisor's code in vendor ), and check the New method in kubernetes/pkg/kubelet/cadvisor/cadvisor_linux.go, if there is an conditional statement like below:

if usingLegacyStats  {
    includedMetrics[cadvisormetrics.DiskUsageMetrics] = struct{}{}
}

please add an new condition here，Related discussion：

if usingLegacyStats || utilfeature.DefaultFeatureGate.Enabled(kubefeatures.LocalStorageCapacityIsolation) {
    includedMetrics[cadvisormetrics.DiskUsageMetrics] = struct{}{}
}

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k8s-ci-robot · 2021-05-19T09:43:09Z

Hi @yyrdl. Thanks for your PR.

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yyrdl · 2021-05-19T09:48:42Z

@googlebot I signed it!

google-cla · 2021-05-19T09:48:45Z

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yyrdl · 2021-05-19T09:56:47Z

@googlebot I fixed it.

Creatone · 2021-05-20T05:43:36Z

/ok-to-test

bobbypage · 2021-05-21T18:41:49Z

Thanks for PR!

Can you clarify what cAdvisor prometheus metrics this PR aims to add to for containerd? Is it just container_fs_usage_bytes? What other filesystem metrics did you mention are still missing on containerd?

bobbypage · 2021-05-21T18:49:22Z

container/common/fsHandler.go

@@ -37,15 +36,18 @@ type FsUsage struct {
 	InodeUsage      uint64
 }

+type FsUsageProvider interface {
+	Usage() (*FsUsage, error)
+	Targets() []string


please add godoc on what "Targets" is referring to

added .

this method is used to get where the fs usage is collected.

bobbypage · 2021-05-21T18:51:12Z

container/common/fsHandler.go

 	}

-	// Wait to handle errors until after all operartions are run.
+	// Wait to handle errors until after all operations are run.


is this comment still relevant here? I think it needs to be moved to Usage() in container/common/fsHandler.go

bobbypage · 2021-05-21T19:16:26Z

container/containerd/client.go

@@ -125,6 +130,21 @@ func (c *client) Version(ctx context.Context) (string, error) {
 	return response.Version, nil
 }

+func (c *client) ContainerFsUsage(ctx context.Context, snapshotter, snapshotkey string) (*common.FsUsage, error) {


does ContainerFsUsage need to be exported?

yes , this client is delivered as interface, if this method is not exported, we can't get the fs usage.

func newContainerdContainerHandler( client ContainerdClient,// Here name string, machineInfoFactory info.MachineInfoFactory, fsInfo fs.FsInfo, cgroupSubsystems *containerlibcontainer.CgroupSubsystems, inHostNamespace bool, metadataEnvs []string, includedMetrics container.MetricSet, ) (container.ContainerHandler, error)

bobbypage · 2021-05-21T19:17:56Z

container/containerd/client.go

@@ -125,6 +130,21 @@ func (c *client) Version(ctx context.Context) (string, error) {
 	return response.Version, nil
 }

+func (c *client) ContainerFsUsage(ctx context.Context, snapshotter, snapshotkey string) (*common.FsUsage, error) {
+	usage, err := c.snapshotsService.Usage(ctx, &snaptshotapi.UsageRequest{


how expensive is this?

will containerd snapshotter have to recaculate the usage every time this is called or does it cache the usage internally?

Yes, there is a cache in it's CRI implemention . And Usage method will recaculate the usage every time, I have change it to ContainerStats,use CRI instead.

bobbypage · 2021-05-21T19:20:12Z

container/containerd/client.go

+	}
+	return &common.FsUsage{
+		BaseUsageBytes:  uint64(usage.Size_),
+		TotalUsageBytes: uint64(usage.Size_),


is it correct that these are both set to usage.Size?

BaseUsageBytes is "Number of bytes consumed by a container through its root filesystem." vs TotalusageBytes is "Total Number of bytes consumed by container." ?

Yes ,for containerd ,there is no log file(used to store logs from container's stdout or stderr) ( At least ,I didn't find it (T_T) ) . But for docker and crio , there are log files, so when collect fs usage, the usage of log file is counted.

By the way, kubelet storge container's logs in another place (/var/log/pods), and it is counted by kubelet when it caculate the usage. see makeContainerStats in kubelet/stats/cri_stats_provider.go

// NOTE: This doesn't support the old pod log path, `/var/log/pods/UID`. For containers // using old log path, empty log stats are returned. This is fine, because we don't // officially support in-place upgrade anyway. var ( containerLogPath = kuberuntime.BuildContainerLogsDirectory(meta.GetNamespace(), meta.GetName(), types.UID(meta.GetUid()), container.GetMetadata().GetName()) err error ) result.Logs, err = p.getPathFsStats(containerLogPath, rootFsInfo) if err != nil { klog.Errorf("Unable to fetch container log stats for path %s: %v ", containerLogPath, err) } return result

Shouldn't cadvisor take the log size of /var/log/pods in account when counting TotalusageBytes?

bobbypage · 2021-05-21T19:24:48Z

/cc @crosbymichael

There was earlier slack thread about of FS Usage containerd metrics on cadvisor xref

yyrdl · 2021-05-26T10:55:41Z

Thanks for PR!

Can you clarify what cAdvisor prometheus metrics this PR aims to add to for containerd? Is it just container_fs_usage_bytes? What other filesystem metrics did you mention are still missing on containerd?

There are many metrics defined in fs.FsStats,at current ,we only get Inode ，BaseUsage and Usage.

For prometheus metrics defined in container.DiskUsageMetrics ,we only lost container_fs_inodes_free and container_fs_limit_bytes .

yyrdl · 2021-05-26T10:56:44Z

And thanks for your reply :)

yyrdl · 2021-06-17T08:12:24Z

/test pull-cadvisor-e2e

bobbypage · 2021-06-21T23:46:13Z

Can you please rebase? There appears to be some go.mod changes which is causing pull-cadvisor-e2e to fail

bobbypage · 2021-06-22T00:02:14Z

container/containerd/client.go

 	"google.golang.org/grpc"
 	"google.golang.org/grpc/backoff"
+	runtimeapi "k8s.io/cri-api/pkg/apis/runtime/v1alpha2"


I'm not sure if we can depend on k8s repos since cadvisor itself is imported into k8s which can result in an import loop.

See #2726 and #2726 (comment) for example where this broke us before.

Do we need to import criapi here? Can we just talk to containerd directly?

It's ok , this package is just pb files.

And there are two way to get the diskusage metrics :

call snapshots.Usage()

call cri.ContainerStats()

They are both grpc interface implemented by containerd , the difference is that snapshots.Usage didn‘t cache any thing, while containerd cri server will sync the disk usage metrics periodically, see snapshotsSyncer.sync ,in order to avoid collecting disk usage metric repeatedly , we should use the cri method.

I see, thanks for the background. Unfortunately, I don't think the fact that this package is just pb files matters; I think it is general issue with dependency management in k8s =>

as @dims mentioned here

"third party software can use staging modules IFF the third party software is not vendored back into k/k :)"

"k8s.io/cri-api/" is staging module and cadvisor itself is vendored back into k/k.

@dims, please keep me honest here, but I don't think anything has changed here.

Will we be able to switch to snapshots.Usage() instead? Can we maybe cache the results internally / only collect them during some periodic house keeping period?

If we just consider this feature in cadvisor independently , we can use snapshots.Usage, but for the sake of performance ,we have to use cri.ContainerStats instead. there is a picture which shows the relationship between cadvisor ,kubelet and containerd in this situation :

If we use snapshots.Usage in cadvisor, it will collect the metrics from filesystem repeatedly,which will cause unnecessary performance loss.

Thanks @yyrdl!

Would you be able to draft a PR of the kubelet changes required prior to merging this PR?

I would just like to ensure we know exactly what changes are required to kubelet first, prior to merging this PR. That way it's clear if we need to make any other cAdvisor/kubelet changes to fully integrate these changes since most important consumer of cAdvisor will be kubelet.

It takes time to redesign the StatsProvider in kubelet , I am a little busy , but I will do it as soon as possible.

@yyrdl FYI, I work with @bobbypage and we are solving another cadvisor-containerd issue which needs CRI as well. To work around the circular dependency issue, current plan is integrating cadvisor with CRI in a separate branch. #2923

@qiutongs Good job! So I should submit this PR to this branch too ?

@yyrdl I sent you a message on the slack and we can discuss more.

qiutongs · 2021-07-23T18:25:37Z

container/common/fsHandler.go

-	extraDir   string
-	fsInfo     fs.FsInfo
+	lastUpdate    time.Time
+	usage         FsUsage


Is thisusage the cache?

vsxen · 2021-08-30T07:44:38Z

ping...

qiutongs · 2021-10-11T23:12:15Z

@yyrdl On top of your PR, the fix was merged in containerd-cri branch. And #2956 will merge the fix to master.

Feel free to close this one.

yyrdl · 2021-10-12T01:28:12Z

@yyrdl On top of your PR, the fix was merged in containerd-cri branch. And #2956 will merge the fix to master.

Feel free to close this one.

good job

qingguee · 2021-12-03T01:47:14Z

Hi @yyrdl and @qiutongs ,
Has the fix merged in v0.43.0? I deployed v0.43.0, but container_fs_use_bytes still not work on containerd POD.

vsxen · 2021-12-03T07:37:54Z

Do you mean sanbox container（pause:3.2）？

qingguee · 2021-12-03T07:50:42Z

@vsxen No. I was cloned cadvisor code, ,change to tag v0.43.0, then docker build the cadvisor image. I deployed that image as daemonset on our K8s to check if the container_fs_use_bytes metrics works with containerd.
The result I see, it still not works. But I thought this PR will fix this issue on containerd.
We are trying to monitor disk usage for container, but this currently not work for containerd

vsxen · 2021-12-03T07:58:05Z

what is you containerd version?
I use containerd 1.4.8 & cadvisor 0.43.0, it works.

qingguee · 2021-12-03T08:00:08Z

it's containerd://1.4.4
Maybe this is the problem. Thanks a lot for the info.

yyrdl · 2021-12-03T08:54:45Z

Does your prometheus pull metrics from the casvisor you deployed or still from kubelet ?@qingguee

qingguee · 2021-12-06T01:47:10Z

Hi @yyrdl , I have both. My v0.43.0 cadvisor was deployed as daemonset, and I use endpoints to collect those metrics. I use {job="cadvisor"} to filter out the kubelet advisor data.
Anyway, I will check with my IT team, see if we can update to containerd 1.4.8, then I will double check. This may take time, but when it ready, I will update.

qingguee · 2022-03-03T02:20:54Z

Hi @yyrdl
After upgrade our cluster with containerd://1.4.12, I still can't see the fs usage for each container, I can only see some usage for node device.

cadvisor:v0.43.0

$ kubectl  get node -o wide
NAME          STATUS   ROLES       AGE   VERSION   KERNEL-VERSION      CONTAINER-RUNTIME
node-demo_0   Ready    edge,node   9d    v1.22.4   5.3.18-57-default   containerd://1.4.12
node-demo_1   Ready    edge,node   9d    v1.22.4   5.3.18-57-default   containerd://1.4.12
node-demo_2   Ready    node        9d    v1.22.4   5.3.18-57-default   containerd://1.4.12
node-demo_3   Ready    node        9d    v1.22.4   5.3.18-57-default   containerd://1.4.12

I deployed cadvisor as daemonset, my Prometheus collect metrics from those endpoint/POD.

apiVersion: apps/v1 # for Kubernetes versions before 1.9.0 use apps/v1beta2
kind: DaemonSet
metadata:
  name: cadvisor
  namespace: cadvisor
spec:
  template:
    spec:
      containers:
      - name: cadvisor
        args:
          - --housekeeping_interval=10s                           # kubernetes default args
          - --max_housekeeping_interval=15s
          - --event_storage_event_limit=default=0
          - --event_storage_age_limit=default=0
          - --enable_metrics=disk,diskIO,cpu                                   # only show stats for docker containers
          - --store_container_labels=true
          # - --whitelisted_container_labels=io.kubernetes.container.name, io.kubernetes.pod.name,io.kubernetes.pod.namespace
          # - --enable_metrics=app,cpu,disk,diskIO,memory,network,process

# HELP container_fs_usage_bytes Number of bytes that are consumed by the container on this filesystem.
# TYPE container_fs_usage_bytes gauge
container_fs_usage_bytes{container_label_adpbrlabelkey="",container_label_app="",container_label_app_kubernetes_io_component="",container_label_app_kubernetes_io_instance="",container_label_app_kubernetes_io_managed_by="",container_label_app_kubernetes_io_name="",container_label_app_kubernetes_io_version="",container_label_controller_revision_hash="",container_label_controller_uid="",container_label_demo_cm_mediator_access="",container_label_demo_data_message_bus_kf_client_access="",container_label_demo_sec_key_management_access="",container_label_helm_sh_chart="",container_label_io_cri_containerd_kind="",container_label_io_kubernetes_container_name="",container_label_io_kubernetes_pod_name="",container_label_io_kubernetes_pod_namespace="",container_label_io_kubernetes_pod_uid="",container_label_job_name="",container_label_k8s_app="",container_label_name="",container_label_pod_template_generation="",container_label_pod_template_hash="",container_label_statefulset_kubernetes_io_pod_name="",device="/dev",id="/",image="",name=""} 0 1646271995262
container_fs_usage_bytes{container_label_adpbrlabelkey="",container_label_app="",container_label_app_kubernetes_io_component="",container_label_app_kubernetes_io_instance="",container_label_app_kubernetes_io_managed_by="",container_label_app_kubernetes_io_name="",container_label_app_kubernetes_io_version="",container_label_controller_revision_hash="",container_label_controller_uid="",container_label_demo_cm_mediator_access="",container_label_demo_data_message_bus_kf_client_access="",container_label_demo_sec_key_management_access="",container_label_helm_sh_chart="",container_label_io_cri_containerd_kind="",container_label_io_kubernetes_container_name="",container_label_io_kubernetes_pod_name="",container_label_io_kubernetes_pod_namespace="",container_label_io_kubernetes_pod_uid="",container_label_job_name="",container_label_k8s_app="",container_label_name="",container_label_pod_template_generation="",container_label_pod_template_hash="",container_label_statefulset_kubernetes_io_pod_name="",device="/dev/rbd0",id="/",image="",name=""} 4.2053632e+07 1646271995262
container_fs_usage_bytes{container_label_adpbrlabelkey="",container_label_app="",container_label_app_kubernetes_io_component="",container_label_app_kubernetes_io_instance="",container_label_app_kubernetes_io_managed_by="",container_label_app_kubernetes_io_name="",container_label_app_kubernetes_io_version="",container_label_controller_revision_hash="",container_label_controller_uid="",container_label_demo_cm_mediator_access="",container_label_demo_data_message_bus_kf_client_access="",container_label_demo_sec_key_management_access="",container_label_helm_sh_chart="",container_label_io_cri_containerd_kind="",container_label_io_kubernetes_container_name="",container_label_io_kubernetes_pod_name="",container_label_io_kubernetes_pod_namespace="",container_label_io_kubernetes_pod_uid="",container_label_job_name="",container_label_k8s_app="",container_label_name="",container_label_pod_template_generation="",container_label_pod_template_hash="",container_label_statefulset_kubernetes_io_pod_name="",device="/dev/shm",id="/",image="",name=""} 0 1646271995262

So, is this issue fixed in 0.43.0? Or my configuration has issue?
This #2785 (comment) , mentioned that it's not working. But as there is a lot different issue reporting this topic, it's quite confuse for me. Could you help to provide the latest info?

yyrdl · 2022-03-03T02:51:03Z

@qingguee cadvisor is integrated in kubelet ,at current ,the fix of this PR is not merged for some package dependency problem , you can copy the code changed in this pr , and build a custom version of kubelet or cadvisor to solve your problem.

qingguee · 2022-03-03T03:07:15Z

@yyrdl Thank you so much for the info.
So, I get more clear for me, we need both kubelet fix and cadvisor fix. But I don't think we could update our kubelet as we rent the cluster.

Could you help to provide the link for package dependency problem, I'd like to follow up. When that solved, we will do upgrade accordingly.

yyrdl · 2022-03-03T03:27:53Z

@qingguee #2872 (comment)

…le#2872

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yyrdl mentioned this pull request May 19, 2021

Disk usage metrics for containerd #2785

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voelzmo mentioned this pull request Jun 16, 2021

Pods with Containerd containers not showing up on cAdvisor metrics #2666

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pingleig mentioned this pull request Jul 20, 2021

[k8s][containerd] container file system metrics is not supported by cadvisor for contianerd aws/amazon-cloudwatch-agent#192

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support collecting FsUsageMetrics for containerd

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fuweid mentioned this pull request Aug 18, 2021

Support disk usage stats for containerd containerd/containerd#5882

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qiutongs mentioned this pull request Aug 19, 2021

Integrate with CRI package and add CRI client to containerd client #2923

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qiutongs mentioned this pull request Sep 8, 2021

Add missing file system metrics in containerd handler #2936

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pmalek-sumo mentioned this pull request Dec 9, 2021

Add an integration test for presence of expected metrics SumoLogic/sumologic-kubernetes-collection#1933

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KeyOfSpectator added a commit to AliyunContainerService/cadvisor that referenced this pull request Feb 26, 2024

patch support collecting FsUsageMetrics for containerd. refer to goog…

df3fe39

…le#2872

support collecting FsUsageMetrics for containerd #2872

support collecting FsUsageMetrics for containerd #2872

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