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k8s與監(jiān)控--解讀prometheus監(jiān)控kubernetes的配置文件

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摘要:前言是一個(gè)開源和社區(qū)驅(qū)動(dòng)的監(jiān)控報(bào)警時(shí)序數(shù)據(jù)庫的項(xiàng)目。集群上部署的應(yīng)用監(jiān)控部署在集群上的應(yīng)用。通過和的接口采集。相應(yīng),配置文件官方也提供了一份,今天我們就解讀一下該配置文件。對于服務(wù)的終端節(jié)點(diǎn),也需要加注解,為則會(huì)將作為監(jiān)控目標(biāo)。

前言

Prometheus 是一個(gè)開源和社區(qū)驅(qū)動(dòng)的監(jiān)控&報(bào)警&時(shí)序數(shù)據(jù)庫的項(xiàng)目。來源于谷歌BorgMon項(xiàng)目?,F(xiàn)在最常見的Kubernetes容器管理系統(tǒng)中,通常會(huì)搭配Prometheus進(jìn)行監(jiān)控。主要監(jiān)控:

Node:如主機(jī)CPU,內(nèi)存,網(wǎng)絡(luò)吞吐和帶寬占用,磁盤I/O和磁盤使用等指標(biāo)。node-exporter采集。

容器關(guān)鍵指標(biāo):集群中容器的CPU詳細(xì)狀況,內(nèi)存詳細(xì)狀況,Network,F(xiàn)ileSystem和Subcontainer等。通過cadvisor采集。

Kubernetes集群上部署的應(yīng)用:監(jiān)控部署在Kubernetes集群上的應(yīng)用。主要是pod,service,ingress和endpoint。通過black-box和kube-apiserver的接口采集。

prometheus自身提供了一些資源的自動(dòng)發(fā)現(xiàn)功能,下面是我從官方github上截圖,羅列了目前提供的資源發(fā)現(xiàn):

由上圖可知prometheus自身提供了自動(dòng)發(fā)現(xiàn)kubernetes的監(jiān)控目標(biāo)的功能。相應(yīng),配置文件官方也提供了一份,今天我們就解讀一下該配置文件。

配置文件解讀

首先直接上官方的配置文件:

# A scrape configuration for running Prometheus on a Kubernetes cluster.
# This uses separate scrape configs for cluster components (i.e. API server, node)
# and services to allow each to use different authentication configs.
#
# Kubernetes labels will be added as Prometheus labels on metrics via the
# `labelmap` relabeling action.
#
# If you are using Kubernetes 1.7.2 or earlier, please take note of the comments
# for the kubernetes-cadvisor job; you will need to edit or remove this job.

# Scrape config for API servers.
#
# Kubernetes exposes API servers as endpoints to the default/kubernetes
# service so this uses `endpoints` role and uses relabelling to only keep
# the endpoints associated with the default/kubernetes service using the
# default named port `https`. This works for single API server deployments as
# well as HA API server deployments.
scrape_configs:
- job_name: "kubernetes-apiservers"

  kubernetes_sd_configs:
  - role: endpoints

  # Default to scraping over https. If required, just disable this or change to
  # `http`.
  scheme: https

  # This TLS & bearer token file config is used to connect to the actual scrape
  # endpoints for cluster components. This is separate to discovery auth
  # configuration because discovery & scraping are two separate concerns in
  # Prometheus. The discovery auth config is automatic if Prometheus runs inside
  # the cluster. Otherwise, more config options have to be provided within the
  # .
  tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
    # If your node certificates are self-signed or use a different CA to the
    # master CA, then disable certificate verification below. Note that
    # certificate verification is an integral part of a secure infrastructure
    # so this should only be disabled in a controlled environment. You can
    # disable certificate verification by uncommenting the line below.
    #
    # insecure_skip_verify: true
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token

  # Keep only the default/kubernetes service endpoints for the https port. This
  # will add targets for each API server which Kubernetes adds an endpoint to
  # the default/kubernetes service.
  relabel_configs:
  - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
    action: keep
    regex: default;kubernetes;https

# Scrape config for nodes (kubelet).
#
# Rather than connecting directly to the node, the scrape is proxied though the
# Kubernetes apiserver.  This means it will work if Prometheus is running out of
# cluster, or can"t connect to nodes for some other reason (e.g. because of
# firewalling).
- job_name: "kubernetes-nodes"

  # Default to scraping over https. If required, just disable this or change to
  # `http`.
  scheme: https

  # This TLS & bearer token file config is used to connect to the actual scrape
  # endpoints for cluster components. This is separate to discovery auth
  # configuration because discovery & scraping are two separate concerns in
  # Prometheus. The discovery auth config is automatic if Prometheus runs inside
  # the cluster. Otherwise, more config options have to be provided within the
  # .
  tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token

  kubernetes_sd_configs:
  - role: node

  relabel_configs:
  - action: labelmap
    regex: __meta_kubernetes_node_label_(.+)
  - target_label: __address__
    replacement: kubernetes.default.svc:443
  - source_labels: [__meta_kubernetes_node_name]
    regex: (.+)
    target_label: __metrics_path__
    replacement: /api/v1/nodes/${1}/proxy/metrics

# Scrape config for Kubelet cAdvisor.
#
# This is required for Kubernetes 1.7.3 and later, where cAdvisor metrics
# (those whose names begin with "container_") have been removed from the
# Kubelet metrics endpoint.  This job scrapes the cAdvisor endpoint to
# retrieve those metrics.
#
# In Kubernetes 1.7.0-1.7.2, these metrics are only exposed on the cAdvisor
# HTTP endpoint; use "replacement: /api/v1/nodes/${1}:4194/proxy/metrics"
# in that case (and ensure cAdvisor"s HTTP server hasn"t been disabled with
# the --cadvisor-port=0 Kubelet flag).
#
# This job is not necessary and should be removed in Kubernetes 1.6 and
# earlier versions, or it will cause the metrics to be scraped twice.
- job_name: "kubernetes-cadvisor"

  # Default to scraping over https. If required, just disable this or change to
  # `http`.
  scheme: https

  # This TLS & bearer token file config is used to connect to the actual scrape
  # endpoints for cluster components. This is separate to discovery auth
  # configuration because discovery & scraping are two separate concerns in
  # Prometheus. The discovery auth config is automatic if Prometheus runs inside
  # the cluster. Otherwise, more config options have to be provided within the
  # .
  tls_config:
    ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token

  kubernetes_sd_configs:
  - role: node

  relabel_configs:
  - action: labelmap
    regex: __meta_kubernetes_node_label_(.+)
  - target_label: __address__
    replacement: kubernetes.default.svc:443
  - source_labels: [__meta_kubernetes_node_name]
    regex: (.+)
    target_label: __metrics_path__
    replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor

# Scrape config for service endpoints.
#
# The relabeling allows the actual service scrape endpoint to be configured
# via the following annotations:
#
# * `prometheus.io/scrape`: Only scrape services that have a value of `true`
# * `prometheus.io/scheme`: If the metrics endpoint is secured then you will need
# to set this to `https` & most likely set the `tls_config` of the scrape config.
# * `prometheus.io/path`: If the metrics path is not `/metrics` override this.
# * `prometheus.io/port`: If the metrics are exposed on a different port to the
# service then set this appropriately.
- job_name: "kubernetes-service-endpoints"

  kubernetes_sd_configs:
  - role: endpoints

  relabel_configs:
  - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scrape]
    action: keep
    regex: true
  - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_scheme]
    action: replace
    target_label: __scheme__
    regex: (https?)
  - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_path]
    action: replace
    target_label: __metrics_path__
    regex: (.+)
  - source_labels: [__address__, __meta_kubernetes_service_annotation_prometheus_io_port]
    action: replace
    target_label: __address__
    regex: ([^:]+)(?::d+)?;(d+)
    replacement: $1:$2
  - action: labelmap
    regex: __meta_kubernetes_service_label_(.+)
  - source_labels: [__meta_kubernetes_namespace]
    action: replace
    target_label: kubernetes_namespace
  - source_labels: [__meta_kubernetes_service_name]
    action: replace
    target_label: kubernetes_name

# Example scrape config for probing services via the Blackbox Exporter.
#
# The relabeling allows the actual service scrape endpoint to be configured
# via the following annotations:
#
# * `prometheus.io/probe`: Only probe services that have a value of `true`
- job_name: "kubernetes-services"

  metrics_path: /probe
  params:
    module: [http_2xx]

  kubernetes_sd_configs:
  - role: service

  relabel_configs:
  - source_labels: [__meta_kubernetes_service_annotation_prometheus_io_probe]
    action: keep
    regex: true
  - source_labels: [__address__]
    target_label: __param_target
  - target_label: __address__
    replacement: blackbox-exporter.example.com:9115
  - source_labels: [__param_target]
    target_label: instance
  - action: labelmap
    regex: __meta_kubernetes_service_label_(.+)
  - source_labels: [__meta_kubernetes_namespace]
    target_label: kubernetes_namespace
  - source_labels: [__meta_kubernetes_service_name]
    target_label: kubernetes_name

# Example scrape config for probing ingresses via the Blackbox Exporter.
#
# The relabeling allows the actual ingress scrape endpoint to be configured
# via the following annotations:
#
# * `prometheus.io/probe`: Only probe services that have a value of `true`
- job_name: "kubernetes-ingresses"

  metrics_path: /probe
  params:
    module: [http_2xx]

  kubernetes_sd_configs:
    - role: ingress

  relabel_configs:
    - source_labels: [__meta_kubernetes_ingress_annotation_prometheus_io_probe]
      action: keep
      regex: true
    - source_labels: [__meta_kubernetes_ingress_scheme,__address__,__meta_kubernetes_ingress_path]
      regex: (.+);(.+);(.+)
      replacement: ${1}://${2}${3}
      target_label: __param_target
    - target_label: __address__
      replacement: blackbox-exporter.example.com:9115
    - source_labels: [__param_target]
      target_label: instance
    - action: labelmap
      regex: __meta_kubernetes_ingress_label_(.+)
    - source_labels: [__meta_kubernetes_namespace]
      target_label: kubernetes_namespace
    - source_labels: [__meta_kubernetes_ingress_name]
      target_label: kubernetes_name

# Example scrape config for pods
#
# The relabeling allows the actual pod scrape endpoint to be configured via the
# following annotations:
#
# * `prometheus.io/scrape`: Only scrape pods that have a value of `true`
# * `prometheus.io/path`: If the metrics path is not `/metrics` override this.
# * `prometheus.io/port`: Scrape the pod on the indicated port instead of the
# pod"s declared ports (default is a port-free target if none are declared).
- job_name: "kubernetes-pods"

  kubernetes_sd_configs:
  - role: pod

  relabel_configs:
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_scrape]
    action: keep
    regex: true
  - source_labels: [__meta_kubernetes_pod_annotation_prometheus_io_path]
    action: replace
    target_label: __metrics_path__
    regex: (.+)
  - source_labels: [__address__, __meta_kubernetes_pod_annotation_prometheus_io_port]
    action: replace
    regex: ([^:]+)(?::d+)?;(d+)
    replacement: $1:$2
    target_label: __address__
  - action: labelmap
    regex: __meta_kubernetes_pod_label_(.+)
  - source_labels: [__meta_kubernetes_namespace]
    action: replace
    target_label: kubernetes_namespace
  - source_labels: [__meta_kubernetes_pod_name]
    action: replace
    target_label: kubernetes_pod_name

當(dāng)然該配置文件,是在prometheus部署在k8s中生效的,即in-cluster模式。

kubernetes-apiservers

該項(xiàng)主要是讓prometheus程序可以訪問kube-apiserver,進(jìn)而進(jìn)行服務(wù)發(fā)現(xiàn)??匆幌路?wù)發(fā)現(xiàn)的代碼可以看出,主要服務(wù)發(fā)現(xiàn):node,service,ingress,pod。

    switch d.role {
    case "endpoints":
        var wg sync.WaitGroup

        for _, namespace := range namespaces {
            elw := cache.NewListWatchFromClient(rclient, "endpoints", namespace, nil)
            slw := cache.NewListWatchFromClient(rclient, "services", namespace, nil)
            plw := cache.NewListWatchFromClient(rclient, "pods", namespace, nil)
            eps := NewEndpoints(
                log.With(d.logger, "role", "endpoint"),
                cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
                cache.NewSharedInformer(elw, &apiv1.Endpoints{}, resyncPeriod),
                cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
            )
            go eps.endpointsInf.Run(ctx.Done())
            go eps.serviceInf.Run(ctx.Done())
            go eps.podInf.Run(ctx.Done())

            for !eps.serviceInf.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            for !eps.endpointsInf.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            for !eps.podInf.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            wg.Add(1)
            go func() {
                defer wg.Done()
                eps.Run(ctx, ch)
            }()
        }
        wg.Wait()
    case "pod":
        var wg sync.WaitGroup
        for _, namespace := range namespaces {
            plw := cache.NewListWatchFromClient(rclient, "pods", namespace, nil)
            pod := NewPod(
                log.With(d.logger, "role", "pod"),
                cache.NewSharedInformer(plw, &apiv1.Pod{}, resyncPeriod),
            )
            go pod.informer.Run(ctx.Done())

            for !pod.informer.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            wg.Add(1)
            go func() {
                defer wg.Done()
                pod.Run(ctx, ch)
            }()
        }
        wg.Wait()
    case "service":
        var wg sync.WaitGroup
        for _, namespace := range namespaces {
            slw := cache.NewListWatchFromClient(rclient, "services", namespace, nil)
            svc := NewService(
                log.With(d.logger, "role", "service"),
                cache.NewSharedInformer(slw, &apiv1.Service{}, resyncPeriod),
            )
            go svc.informer.Run(ctx.Done())

            for !svc.informer.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            wg.Add(1)
            go func() {
                defer wg.Done()
                svc.Run(ctx, ch)
            }()
        }
        wg.Wait()
    case "ingress":
        var wg sync.WaitGroup
        for _, namespace := range namespaces {
            ilw := cache.NewListWatchFromClient(reclient, "ingresses", namespace, nil)
            ingress := NewIngress(
                log.With(d.logger, "role", "ingress"),
                cache.NewSharedInformer(ilw, &extensionsv1beta1.Ingress{}, resyncPeriod),
            )
            go ingress.informer.Run(ctx.Done())

            for !ingress.informer.HasSynced() {
                time.Sleep(100 * time.Millisecond)
            }
            wg.Add(1)
            go func() {
                defer wg.Done()
                ingress.Run(ctx, ch)
            }()
        }
        wg.Wait()
    case "node":
        nlw := cache.NewListWatchFromClient(rclient, "nodes", api.NamespaceAll, nil)
        node := NewNode(
            log.With(d.logger, "role", "node"),
            cache.NewSharedInformer(nlw, &apiv1.Node{}, resyncPeriod),
        )
        go node.informer.Run(ctx.Done())

        for !node.informer.HasSynced() {
            time.Sleep(100 * time.Millisecond)
        }
        node.Run(ctx, ch)

    default:
        level.Error(d.logger).Log("msg", "unknown Kubernetes discovery kind", "role", d.role)
    }   
kubernetes-nodes

發(fā)現(xiàn)node以后,通過/api/v1/nodes/${1}/proxy/metrics來獲取node的metrics。

kubernetes-cadvisor

cadvisor已經(jīng)被集成在kubelet中,所以發(fā)現(xiàn)了node就相當(dāng)于發(fā)現(xiàn)了cadvisor。通過 /api/v1/nodes/${1}/proxy/metrics/cadvisor采集容器指標(biāo)。

kubernetes-services和kubernetes-ingresses

該兩種資源監(jiān)控方式差不多,都是需要安裝black-box,然后類似于探針去定時(shí)訪問,根據(jù)返回的http狀態(tài)碼來判定service和ingress的服務(wù)可用性。
PS:不過我自己在這里和官方的稍微有點(diǎn)區(qū)別,

- target_label: __address__
      replacement: blackbox-exporter.example.com:9115

官方大致是需要我們要?jiǎng)?chuàng)建black-box 的ingress從外部訪問,這樣從效率和安全性都不是最合適的。所以我一般都是直接內(nèi)部dns訪問。如下

- target_label: __address__
      replacement: blackbox-exporter.kube-system:9115

當(dāng)然看源碼可以發(fā)現(xiàn),并不是所有的service和ingress都會(huì)健康監(jiān)測,如果需要將服務(wù)進(jìn)行健康監(jiān)測,那么你部署應(yīng)用的yaml文件加一些注解。例如:
對于service和ingress:
需要加注解:prometheus.io/scrape: "true"

apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
  name: prometheus-node-exporter
  namespace: kube-system
  labels:
    app: prometheus
    component: node-exporter
spec:
  clusterIP: None
  ports:
    - name: prometheus-node-exporter
      port: 9100
      protocol: TCP
  selector:
    app: prometheus
    component: node-exporter
  type: ClusterIP
kubernetes-pods

對于pod的監(jiān)測也是需要加注解:

prometheus.io/scrape,為true則會(huì)將pod作為監(jiān)控目標(biāo)。

prometheus.io/path,默認(rèn)為/metrics

prometheus.io/port , 端口

所以看到此處可以看出,該job并不是監(jiān)控pod的指標(biāo),pod已經(jīng)通過前面的cadvisor采集。此處是對pod中應(yīng)用的監(jiān)控。寫過exporter的人應(yīng)該對這個(gè)概念非常清楚。通俗講,就是你pod中的應(yīng)用提供了prometheus的監(jiān)控功能,加上對應(yīng)的注解,那么該應(yīng)用的metrics會(huì)定時(shí)被采集走。

kubernetes-service-endpoints

對于服務(wù)的終端節(jié)點(diǎn),也需要加注解:

prometheus.io/scrape,為true則會(huì)將pod作為監(jiān)控目標(biāo)。

prometheus.io/path,默認(rèn)為/metrics

prometheus.io/port , 端口

prometheus.io/scheme 默認(rèn)http,如果為了安全設(shè)置了https,此處需要改為https

這個(gè)基本上同上的。采集service-endpoints的metrics。

個(gè)人認(rèn)為:如果某些部署應(yīng)用只有pod沒有service,那么這種情況只能在pod上加注解,通過kubernetes-pods采集metrics。如果有service,那么就無需在pod加注解了,直接在service上加即可。畢竟service-endpoints最終也會(huì)落到pod上。

總結(jié) 配置項(xiàng)總結(jié)

kubernetes-service-endpoints和kubernetes-pods采集應(yīng)用中metrics,當(dāng)然并不是所有的都提供了metrics接口。

kubernetes-ingresses 和kubernetes-services 健康監(jiān)測服務(wù)和ingress健康的狀態(tài)

kubernetes-cadvisor 和 kubernetes-nodes,通過發(fā)現(xiàn)node,監(jiān)控node 和容器的cpu等指標(biāo)

自動(dòng)發(fā)現(xiàn)源碼

參考client-go和prometheus自動(dòng)發(fā)現(xiàn)k8s,這種監(jiān)聽k8s集群中資源的變化,使用informer實(shí)現(xiàn),不要輪詢kube-apiserver接口。

參考

該配置文件需要部署一些組件來支持prometheus對k8s的監(jiān)控,例如black-exporter。因?yàn)橐詣?dòng)發(fā)現(xiàn),獲取集群的一些信息,所以也要做rbac的授權(quán)。具體參考:
github

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