AWS运维部署实践--EKS多集群监控指标集中采集到集群外一个Prometheus的实践

二丫讲梵

二丫讲梵 · 2024-10-26 · via 二丫讲梵

# 前言

实际生产场景中，我们可能会根据不同场景，把集群拆分为多个，这个时候，Prometheus是没必要跟随集群部署多套的，于是，我们就有了这样一个需求，把多个EKS集群的相关指标，投递到一个集中化的Prometheus中。

借助于Prometheus的remote_write (opens new window)的特性，我们可以简单快捷地实现此需求，而且开源社区也有不少基于此特性封装好的现成工具，可以直接使用。

# 引出categraf

在这些工具中，我们选择了categraf (opens new window)，一方面是它足够强大，支持所有常见监控对象的指标传送能力，另一方面是因为我们的告警引擎选择的是nightingale (opens new window)，这两款开源工具，均出自快猫星云技术团队。

以下是其官方对于categraf的介绍：

Categraf 是一个开源的监控采集 Agent，类似 Telegraf (opens new window)、Grafana-Agent (opens new window)、Datadog-Agent (opens new window)，希望对所有常见监控对象提供高质量的监控数据采集能力，采用了 All-in-one 的设计理念，可以同时支持指标、日志、链路追踪数据的采集。Categraf 由快猫星云技术团队研发并开源，快猫星云技术团队同时也是 Open-Falcon (opens new window) 和 Nightingale (opens new window) 创始研发团队。

Categraf 和 Telegraf、Exporters、Grafana-Agent、Datadog-Agent 等的关系是什么？

Telegraf 是 InfluxDB 生态的产品，因为 InfluxDB 是支持存储字符串类型的 value，所以 Telegraf 采集的很多 field 是字符串类型，另外 InfluxDB 的设计，允许 labels 是非稳态结构，比如 result_code 标签，有时其 value 是 0，有时其 value 是 1，在 InfluxDB 中都可以接受。但是上面两点，在以 Prometheus 为代表的、符合 OpenMetrics 标准的时序库中，处理起来就很麻烦。

Prometheus 生态有各种 Exporters，但是设计逻辑都是一个监控类型一个 Exporter，甚至一个实例一个 Exporter，生产环境就可能会部署特别多的 Exporters，管理起不方便。

Grafana-Agent import 了大量 Exporters 的代码，没有裁剪，没有优化，没有最佳实践在产品上的落地，有些中间件，仍然采取的是一个 Grafana-Agent 一个目标实例，导致会有很多的 Grafana-Agent 进程在运行，管理起来也很不方便。

Datadog-Agent 确实是集大成者，但是大量代码是 Python 的，整个发布包也比较大，有不少历史包袱，而且生态上是自成一派，和云原生生态、开源社区相对割裂。

所以，Categraf 确实又是一个轮子，期望解决和规避上面分析提到的一些弊端，Categraf的设计目标：

开源、开放、遵循 OpenTelemetry 标准；

拥抱 Prometheus 开源生态，支持 remote_write 写入协议，支持将数据写到类似于 Promethues、M3DB、VictoriaMetrics、InfluxDB、Open-Falcon、TDengine等时序数据库；

指标数据只采集数值，不采集字符串，标签维持稳态结构；

采用 All-in-One 的设计理念，所有的采集工作用一个 Agent 搞定；

采用 Go 语言编写，静态编译依赖少，容易分发，易于安装；

尽可能落地最佳实践，不需要采集的数据无需采集，针对可能会对时序库造成高基数的问题在采集侧做出规避处理；

针对常用的采集对象，在提供采集能力的同时，配套整理出监控大盘和告警规则模版，用户可以直接导入使用；

可能看了这些介绍之后，你仍然不知道categraf该怎么使用，不用慌，接下来就会用实际例子，来带你领略此软件的魅力与风采。

# EKS集群指标采集

开始配置之前，需要考虑EKS集群有哪些指标需要采集，k8s集群各个维度有海量的指标，这里只介绍node节点层面的组件：kube-proxy与kubelet，以及容器指标cadvisor，和集群资源指标kube-state-metrics。

关于cadvisor的指标详细文档见：Monitoring cAdvisor with Prometheus (opens new window)

关于kube-state-metrics的详细说明文档见：https://github.com/kubernetes/kube-state-metrics

其中kube-proxy，kubelet以及cadvisor三个组件通过daemonset的方式进行部署，kube-state-metrics则以deployment的方式部署。

# 部署daemonset

📢注意： 本文所有组件将会部署在monitor的ns中，因此操作之前，请确保已创建了这个命名空间。

另外：本文执行的K8S集群版本为1.30，请注意版本区别可能带来的差异。

部署daemonset需要如下几个配置内容，文件明细如下：

$ tree daemonset

daemonset
├── categraf-daemonset-config.yaml
├── categraf-daemonset.yaml
└── categraf-serviceaccount.yaml

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EKS集群拉起之后，默认启动的kubelet等组件已经暴漏了metrics监控接口，只不过这个接口请求需要认证，因此我们需要先创建一个serviceaccount。

categraf-serviceaccount.yaml

---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: categraf-serviceaccount
  namespace: monitor
rules:
  - apiGroups: [""]
    resources:
      - nodes
      - nodes/metrics
      - nodes/stats
      - nodes/proxy
      - services
      - endpoints
      - pods
    verbs: ["get", "list", "watch"]
  - apiGroups:
      - extensions
      - networking.k8s.io
    resources:
      - ingresses
    verbs: ["get", "list", "watch"]
  - nonResourceURLs: ["/metrics", "/metrics/cadvisor"]
    verbs: ["get"]
---
apiVersion: v1
kind: ServiceAccount
metadata:
  name: categraf-serviceaccount
  namespace: monitor
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: categraf-serviceaccount
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: categraf-serviceaccount
subjects:
  - kind: ServiceAccount
    name: categraf-serviceaccount
    namespace: monitor
---
apiVersion: v1
kind: Secret
metadata:
  name: categraf-secret
  namespace: monitor
  annotations:
    kubernetes.io/service-account.name: categraf-serviceaccount
type: kubernetes.io/service-account-token

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然后执行apply，把serviceaccount创建出来，我们yaml中还定义了secret，因此可以直接获取到请求的token，可以进行验证：

$ token=`kubectl get secret categraf-secret -n monitor -o jsonpath={.data.token} | base64 -d`

拿到token之后，请注意，接下来这一步的请求，请务必处在能够访问通节点端口的位置发起，建议直接登录到某台节点上进行请求：

$ curl -s -k -H "Authorization: Bearer $token" https://127.0.0.1:10250/metrics | head -n 5
# HELP aggregator_discovery_aggregation_count_total [ALPHA] Counter of number of times discovery was aggregated
# TYPE aggregator_discovery_aggregation_count_total counter
aggregator_discovery_aggregation_count_total 0
# HELP apiserver_audit_event_total [ALPHA] Counter of audit events generated and sent to the audit backend.
# TYPE apiserver_audit_event_total counter

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sa创建完毕之后，下一步是定义categraf的采集配置，categraf的各种采集场景，以插件的形式进行提供，你可以通过如下几个位置，快速了解一个插件的用途及用法：

官方文档：插件文档 (opens new window)
源代码配置项：inputs (opens new window)

我们这里想要采集的指标，则通过prometheus (opens new window)这个组件来进行，即categraf通过配置文件的定义，将会化身为prometheus的一个客户端，拿到配置中指定的指标，然后写入到指定的Prometheus地址中。

categraf-daemonset-config.yaml：

---
kind: ConfigMap
metadata:
  name: categraf-daemonset-input-prometheus
  namespace: monitor
apiVersion: v1
data:
  prometheus.toml: |
    [[instances]]
    urls = ["http://127.0.0.1:10249/metrics"]
    labels = { job="kube-proxy",cluster="aws3-sgp-eks-cluster",metrics_from="categraf" }
    [[instances]]
    urls = ["https://127.0.0.1:10250/metrics"]
    bearer_token_file = "/var/run/secrets/kubernetes.io/serviceaccount/token"
    use_tls = true
    insecure_skip_verify = true
    labels = { job="kubelet",cluster="aws3-sgp-eks-cluster",metrics_from="categraf"}
    [[instances]]
    urls = ["https://127.0.0.1:10250/metrics/cadvisor"]
    bearer_token_file = "/var/run/secrets/kubernetes.io/serviceaccount/token"
    use_tls = true
    insecure_skip_verify = true
    labels = { job="cadvisor",cluster="aws3-sgp-eks-cluster",metrics_from="categraf" }
---
kind: ConfigMap
metadata:
  name: categraf-daemonset-config
  namespace: monitor
apiVersion: v1
data:
  config.toml: |
    [global]
    hostname = "$HOSTNAME"
    interval = 15
    providers = ["local"]
    [writer_opt]
    batch = 2000
    chan_size = 10000
    [[writers]]
    url = "https://prometheus.eryajf.net/api/v1/write"
    timeout = 5000
    dial_timeout = 2500
    max_idle_conns_per_host = 100

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此处分别定义了两块儿内容，上半部分 categraf-daemonset-input-prometheus表示配置指定要采集的指标信息，categraf将会从这些地址拿到指标信息(这里建议给每个集群增加一个集群标识，并给每个基于categraf采集的指标，增加一个metrics_from的标识)。下半部分 categraf-daemonset-config 则定义了categraf拿到指标之后，要写入到哪里。

接下来就是要部署ds的服务了。

categraf-daemonset.yaml

apiVersion: apps/v1
kind: DaemonSet
metadata:
  labels:
    app: categraf-daemonset
  name: categraf-daemonset
  namespace: monitor
spec:
  selector:
    matchLabels:
      app: categraf-daemonset
  template:
    metadata:
      labels:
        app: categraf-daemonset
    spec:
      containers:
        - env:
            - name: TZ
              value: Asia/Shanghai
            - name: HOSTNAME
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: spec.nodeName
            - name: HOSTIP
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.hostIP
          image: flashcatcloud/categraf:v0.3.82
          imagePullPolicy: IfNotPresent
          name: categraf
          volumeMounts:
            - mountPath: /etc/categraf/conf
              name: categraf-daemonset-config
            - mountPath: /etc/categraf/conf/input.prometheus
              name: categraf-daemonset-input-prometheus
      hostNetwork: true
      serviceAccountName: categraf-serviceaccount
      restartPolicy: Always
      tolerations:
        - effect: NoSchedule
          operator: Exists
      volumes:
        - configMap:
            name: categraf-daemonset-config
          name: categraf-daemonset-config
        - configMap:
            name: categraf-daemonset-input-prometheus
          name: categraf-daemonset-input-prometheus

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三个文件全部apply之后，就能够在远程的Prometheus中检索对应的指标了。

申明

原创文章eryajf，未经授权，严禁转载，侵权必究！此乃文中随机水印，敬请读者谅解。

# 部署deployment

上边daemonset部署成功之后，接下来部署的deployment就简单很多了。

对应的配置文件如下：

$ tree deployment

deployment
├── categraf-deployment-config.yaml
├── kube-state-metrics-deployment.yaml
└── nightingale-categraf-deployment.yaml

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首先我们把kube-state-metrics部署出来。

kube-state-metrics-deployment.yaml

apiVersion: v1
automountServiceAccountToken: false
kind: ServiceAccount
metadata:
  labels:
    app.kubernetes.io/component: exporter
    app.kubernetes.io/name: kube-state-metrics
    app.kubernetes.io/version: 2.13.0
  name: kube-state-metrics
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  labels:
    app.kubernetes.io/component: exporter
    app.kubernetes.io/name: kube-state-metrics
    app.kubernetes.io/version: 2.13.0
  name: kube-state-metrics
rules:
  - apiGroups:
      - ""
    resources:
      - configmaps
      - secrets
      - nodes
      - pods
      - services
      - serviceaccounts
      - resourcequotas
      - replicationcontrollers
      - limitranges
      - persistentvolumeclaims
      - persistentvolumes
      - namespaces
      - endpoints
    verbs:
      - list
      - watch
  - apiGroups:
      - apps
    resources:
      - statefulsets
      - daemonsets
      - deployments
      - replicasets
    verbs:
      - list
      - watch
  - apiGroups:
      - batch
    resources:
      - cronjobs
      - jobs
    verbs:
      - list
      - watch
  - apiGroups:
      - autoscaling
    resources:
      - horizontalpodautoscalers
    verbs:
      - list
      - watch
  - apiGroups:
      - authentication.k8s.io
    resources:
      - tokenreviews
    verbs:
      - create
  - apiGroups:
      - authorization.k8s.io
    resources:
      - subjectaccessreviews
    verbs:
      - create
  - apiGroups:
      - policy
    resources:
      - poddisruptionbudgets
    verbs:
      - list
      - watch
  - apiGroups:
      - certificates.k8s.io
    resources:
      - certificatesigningrequests
    verbs:
      - list
      - watch
  - apiGroups:
      - discovery.k8s.io
    resources:
      - endpointslices
    verbs:
      - list
      - watch
  - apiGroups:
      - storage.k8s.io
    resources:
      - storageclasses
      - volumeattachments
    verbs:
      - list
      - watch
  - apiGroups:
      - admissionregistration.k8s.io
    resources:
      - mutatingwebhookconfigurations
      - validatingwebhookconfigurations
    verbs:
      - list
      - watch
  - apiGroups:
      - networking.k8s.io
    resources:
      - networkpolicies
      - ingressclasses
      - ingresses
    verbs:
      - list
      - watch
  - apiGroups:
      - coordination.k8s.io
    resources:
      - leases
    verbs:
      - list
      - watch
  - apiGroups:
      - rbac.authorization.k8s.io
    resources:
      - clusterrolebindings
      - clusterroles
      - rolebindings
      - roles
    verbs:
      - list
      - watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  labels:
    app.kubernetes.io/component: exporter
    app.kubernetes.io/name: kube-state-metrics
    app.kubernetes.io/version: 2.13.0
  name: kube-state-metrics
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: kube-state-metrics
subjects:
  - kind: ServiceAccount
    name: kube-state-metrics
    namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
  labels:
    app.kubernetes.io/component: exporter
    app.kubernetes.io/name: kube-state-metrics
    app.kubernetes.io/version: 2.13.0
  name: kube-state-metrics
  namespace: kube-system
spec:
  type: NodePort
  ports:
    - name: http-metrics
      port: 8080
      targetPort: http-metrics
      nodePort: 31666
    - name: telemetry
      port: 8081
      targetPort: telemetry
  selector:
    app.kubernetes.io/name: kube-state-metrics
---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app.kubernetes.io/component: exporter
    app.kubernetes.io/name: kube-state-metrics
    app.kubernetes.io/version: 2.13.0
  name: kube-state-metrics
  namespace: kube-system
spec:
  replicas: 1
  selector:
    matchLabels:
      app.kubernetes.io/name: kube-state-metrics
  template:
    metadata:
      labels:
        app.kubernetes.io/component: exporter
        app.kubernetes.io/name: kube-state-metrics
        app.kubernetes.io/version: 2.13.0
    spec:
      automountServiceAccountToken: true
      containers:
        - image: registry.k8s.io/kube-state-metrics/kube-state-metrics:v2.13.0
          livenessProbe:
            httpGet:
              path: /livez
              port: http-metrics
            initialDelaySeconds: 5
            timeoutSeconds: 5
          name: kube-state-metrics
          ports:
            - containerPort: 8080
              name: http-metrics
            - containerPort: 8081
              name: telemetry
          readinessProbe:
            httpGet:
              path: /readyz
              port: telemetry
            initialDelaySeconds: 5
            timeoutSeconds: 5
          securityContext:
            allowPrivilegeEscalation: false
            capabilities:
              drop:
                - ALL
            readOnlyRootFilesystem: true
            runAsNonRoot: true
            runAsUser: 65534
            seccompProfile:
              type: RuntimeDefault
      nodeSelector:
        kubernetes.io/os: linux
      serviceAccountName: kube-state-metrics
---
apiVersion: v1
kind: Service
metadata:
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/port: "8080"
  name: kube-state-metrics
  namespace: kube-system
  labels:
    app: kube-state-metrics
spec:
  ports:
    - name: kube-state-metrics
      port: 8080
      protocol: TCP
  selector:
    app.kubernetes.io/name: kube-state-metrics

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然后把配置文件定义好。

categraf-deployment-config.yaml

---
kind: ConfigMap
metadata:
  name: categraf-deployment-scrape-config
  namespace: monitor
apiVersion: v1
data:
  in_cluster_scrape.yaml: |
    global:
      scrape_interval: 15s
    scrape_configs:
      - job_name: "kube-state-metrics"
        metrics_path: "/metrics"
        static_configs:
          - targets: ["kube-state-metrics.kube-system.svc.cluster.local:8080"]
        relabel_configs:
          - action: replace
            target_label: metrics_from
            replacement: 'categraf'
          - action: replace
            target_label: cluster
            replacement: 'aws3-sgp-eks-cluster'
      # 如果你这里还有其他服务需要监控，同时可以在此定义
      - job_name: "examples"
        metrics_path: "/metrics"
        static_configs:
          - targets: ["examples.app.svc.cluster.local:1234"]
        relabel_configs:
          - action: replace
            target_label: metrics_from
            replacement: 'categraf'
          - action: replace
            target_label: cluster
            replacement: 'aws3-sgp-eks-cluster'
    remote_write:
      - url: 'https://prometheus.eryajf.net/api/v1/write'
---
kind: ConfigMap
metadata:
  name: categraf-deployment-config
  namespace: monitor
apiVersion: v1
data:
  config.toml: |
    [global]
    print_configs = true
    hostname = "$HOSTNAME"
    omit_hostname = false
    precision = "ms"
    interval = 15
    [global.labels]
    region = "shanghai"
    env = "aws3-sgp-eks-cluster"
    [writer_opt]
    batch = 2000
    chan_size = 10000
    [[writers]]
    url = "https://prometheus.eryajf.net/api/v1/write"
    timeout = 5000
    dial_timeout = 2500
    max_idle_conns_per_host = 100
  prometheus.toml: |
    [prometheus]
    enable = true
    scrape_config_file="/opt/categraf/scrape/in_cluster_scrape.yaml"
    ## log level, debug warn info error
    log_level="info"
    ## wal reserve time duration, default value is 2 hour
    # wal_min_duration=2
    ## wal storage path, default value is ./data-agent
    wal_storage_path="/opt/categraf/prometheus-wal"

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上边已经做过介绍，这里就不重复介绍了。

接下来就是部署categraf。

categraf-deployment-config.yaml

---
apiVersion: apps/v1
kind: Deployment
metadata:
  labels:
    app: n9e
    component: categraf
  name: nightingale-categraf-deployment
  namespace: monitor
spec:
  replicas: 1
  selector:
    matchLabels:
      app: n9e
      component: categraf
  template:
    metadata:
      labels:
        app: n9e
        component: categraf
    spec:
      containers:
        - env:
            - name: TZ
              value: Asia/Shanghai
            - name: HOSTNAME
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: spec.nodeName
            - name: HOSTIP
              valueFrom:
                fieldRef:
                  apiVersion: v1
                  fieldPath: status.hostIP
          image: flashcatcloud/categraf:v0.3.82
          imagePullPolicy: IfNotPresent
          name: categraf
          command: ["/usr/bin/categraf"]
          args: ["-configs", "/opt/categraf/conf"]
          terminationMessagePolicy: File
          volumeMounts:
            - mountPath: /opt/categraf/conf
              name: categraf-deployment-config
            - mountPath: /opt/categraf/scrape
              name: categraf-deployment-scrape-config
            - mountPath: /opt/categraf/prometheus-wal
              name: prometheus-wal
      dnsPolicy: ClusterFirst
      hostNetwork: false
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: {}
      serviceAccountName: categraf-serviceaccount
      terminationGracePeriodSeconds: 30
      tolerations:
        - effect: NoSchedule
          operator: Exists
      volumes:
        - configMap:
            defaultMode: 420
            name: categraf-deployment-config
          name: categraf-deployment-config
        - configMap:
            defaultMode: 420
            name: categraf-deployment-scrape-config
          name: categraf-deployment-scrape-config
        - emptyDir: {}
          name: prometheus-wal

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然后执行apply，就能够把kube-state-metrics的指标正常采集到统一的远程Prometheus中了。

# 最后

上边内容介绍了如何把EKS集群的一些指标采集到集群外的Prometheus中，从而在面对多集群的时候，一个Prometheus就搞定，而不用跟随集群存在多套Prometheus集群。

在deployment的示例中，还有一个example的扩展示例，事实上在实际业务中，的确会存在此类监控的需求，可以往下复制配置文件，进行采集。

不过这个方案还有一个问题无法解决，那就是与Prometheus-Operater集成的ServiceMonitor这种场景，目前categraf的issue中也有人反馈过这个问题，开发者也讲了未来会通过某种方案解决此问题。我个人目前则是写了一个脚本，来把需要基于ServiceMonitor采集的指标中转出去。

此内容由惯性聚合(RSS阅读器)自动聚合整理，仅供阅读参考。原文来自 — 版权归原作者所有。

推荐订阅源

二丫讲梵

# 前言

# 引出categraf

# EKS集群指标采集

# 部署daemonset

# 部署deployment

# 最后