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用户自建Prometheus对控制平面组件的监控和告警

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本文介绍如何基于用户自建的Prometheus，采集ACK Pro集群的控制平面组件监控APIServer、etcd、Scheduler、KCM、CCM指标配置，并介绍推荐的报警配置。

前提条件

  • 自建的Prometheus能够访问ACK Pro集群的APIServer，并拥有/metrics的读权限。

  • 自建的Prometheus可以在ACK Pro集群内，也可以在ACK Pro集群外。

背景信息

ACK Pro提供控制平面核心组件监控对外透出的功能，并基于ARMS预置了相关的组件监控大盘，具体包括APIServer、Cloud Controller Manager、etcd、Kube Controller Manager和Scheduler，如果您选用了ARMS监控能力，监控数据会被ARMS代理自动采集并在监控大盘上实时展示。如果您希望通过自建Prometheus采集ACK Pro集群的控制平面核心组件指标并配置相应告警，实现与自建监控系统的集成，可以基于本文进行配置。

Prometheus采集配置

使用自建的Prometheus采集ACK Pro集群控制平面核心组件指标，首先需要在Prometheus的配置文件prometheus.yaml中配置指标采集Job，配置文件格式如下：

global:
  scrape_interval:     15s # By default, scrape targets every 15 seconds.

  # Attach these labels to any time series or alerts when communicating with
  # external systems (federation, remote storage, Alertmanager).
  external_labels:
    monitor: 'codelab-monitor'

# A scrape configuration containing exactly one endpoint to scrape:
# Here it's Prometheus itself.
scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: ack-api-server
    ......

  - job_name: ack-etcd
    ......

  - job_name: ack-scheduler
    ......

其中，每个核心组件对应一个Job配置，具体配置可参见对应核心组件的指标清单。社区Prometheus配置Prometheus.yaml方法，请参见Configuration。

社区Prometheus Operator方案以及ACK应用市场ack-prometheus-operator组件的相关信息，请参见开源Prometheus监控。关于自定义采集配置，请参见Prometheus Operator社区官方文档Prometheus Operator进行数据采集配置。

Prometheus报警规则配置

社区Prometheus报警配置具体操作，请参见Alerting_rules。

ACK Pro集群内部监控

内部监控是将Prometheus部署在待监控的ACK Pro集群内的监控形式。

kube-apiserver

关于kube-apiserver组件的更多信息，请参见kube-apiserver组件监控。

  • Prometheus采集配置

    - job_name: ack-api-server  
  scrape_interval: 30s
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: https
  #  scheme: https
  honor_labels: true
  honor_timestamps: true
  params:
    hosting: ["true"]
    job: ["apiserver"]
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names: [default]
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  tls_config: {ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, server_name: kubernetes,
               insecure_skip_verify: false}
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: apiserver
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_service_label_provider]
    separator: ;
    regex: kubernetes
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: https
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Node;(.*)
    target_label: node
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Pod;(.*)
    target_label: pod
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: (.+)
    target_label: job
    replacement: ${1}
    action: replace
  - {separator: ;, regex: (.*), target_label: endpoint, replacement: https, action: replace}

  • Prometheus告警规则

    - alert: AckApiServerWarning
  annotations:
    message:  APIServer is not available in last 5 minutes. Please check the prometheus job and target status.
  expr: |
    (absent(up{job="ack-api-server",pod!=""}) or (count(up{job="ack-api-server",pod!=""}) <= 1)) == 1
  for: 5m
  labels:
    severity: critical

  • 监控采集指标清单

    kube-apiserver监控采集指标清单，请参见kube-apiserver指标清单。

etcd

关于etcd组件的更多信息，请参见etcd组件监控。

  • Prometheus采集配置

    - job_name: ack-etcd 
  scrape_interval: 30s
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: https
  #  scheme: https
  honor_labels: true
  honor_timestamps: true
  params:
    hosting: ["true"]
    job: ["etcd"]
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names: [default]
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  tls_config: {ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, server_name: kubernetes,
               insecure_skip_verify: false}
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: apiserver
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_service_label_provider]
    separator: ;
    regex: kubernetes
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: https
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Node;(.*)
    target_label: node
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Pod;(.*)
    target_label: pod
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: (.+)
    target_label: job
    replacement: ${1}
    action: replace
  - {separator: ;, regex: (.*), target_label: endpoint, replacement: https, action: replace}

  • Prometheus告警规则

    - alert: AckETCDWarning
  annotations:
    message: Etcd cluster has no leader in last 5 minutes, please check whether the cluster is overloaded and contact ACK team.
  expr: |
    sum_over_time(etcd_server_has_leader[5m]) == 0
  for: 5m
  labels:
    severity: critical


- alert: AckETCDWarning
  annotations:
    message: Etcd is not available in last 5 minutes. Please check the prometheus job and target status.
  expr: |
    (absent(up{job="ack-etcd",pod!=""}) or (count(up{job="ack-etcd",pod!=""}) <= 2)) == 1
  for: 5m
  labels:
    severity: critical

  • 监控采集指标清单

    etcd监控采集指标清单，请参见etcd指标清单。

kube-scheduler

关于kube-scheduler组件的更多信息，请参见kube-scheduler组件监控。

  • Prometheus采集配置

    - job_name: ack-scheduler
  scrape_interval: 30s
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: https
  #  scheme: https
  honor_labels: true
  honor_timestamps: true
  params:
    hosting: ["true"]
    job: ["ack-scheduler"]
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names: [default]
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  tls_config: {ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, server_name: kubernetes,
               insecure_skip_verify: false}
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: apiserver
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_service_label_provider]
    separator: ;
    regex: kubernetes
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: https
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Node;(.*)
    target_label: node
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Pod;(.*)
    target_label: pod
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: (.+)
    target_label: job
    replacement: ${1}
    action: replace
  - {separator: ;, regex: (.*), target_label: endpoint, replacement: https, action: replace}

  • Prometheus告警规则

    - alert: AckSchedulerWarning
  annotations:
    message: Scheduler is not available in last 3 minutes. Please check the prometheus job and target status.
  expr: |
    (absent(up{job="ack-scheduler",pod!=""}) or (count(up{job="ack-scheduler",pod!=""}) <= 0)) == 1
  for: 3m
  labels:
    severity: critical

  • 监控采集指标清单

    kube-scheduler监控采集指标清单，请参见kube-scheduler指标清单。

kube-controller-manager

关于kube-controller-manager组件的更多信息，请参见kube-controller-manager组件监控。

  • Prometheus采集配置

    - job_name: ack-kcm
  scrape_interval: 30s
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: https
  #  scheme: https
  honor_labels: true
  honor_timestamps: true
  params:
    hosting: ["true"]
    job: ["ack-kube-controller-manager"]
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names: [default]
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  tls_config: {ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, server_name: kubernetes,
               insecure_skip_verify: false}
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: apiserver
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_service_label_provider]
    separator: ;
    regex: kubernetes
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: https
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Node;(.*)
    target_label: node
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Pod;(.*)
    target_label: pod
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: (.+)
    target_label: job
    replacement: ${1}
    action: replace
  - {separator: ;, regex: (.*), target_label: endpoint, replacement: https, action: replace}

  • Prometheus告警规则

    - alert: AckKCMWarning
  annotations:
    message: KCM is not available in last 3 minutes. Please check the prometheus job and target status.
  expr: |
    (absent(up{job="ack-kcm",pod!=""})or(count(up{job="ack-kcm",pod!=""})<=0))>=1
  for: 3m
  labels:
    severity: critical

  • 监控采集指标清单

    kube-controller-manager监控采集指标清单，请参见kube-controller-manager指标清单。

cloud-controller-manager

关于cloud-controller-manager组件的更多信息，请参见cloud-controller-mananger组件监控。

  • Prometheus采集配置

    - job_name: ack-cloud-controller-manager
  scrape_interval: 30s
  scrape_timeout: 30s
  metrics_path: /metrics
  scheme: https
  #  scheme: https
  honor_labels: true
  honor_timestamps: true
  params:
    hosting: ["true"]
    job: ["ack-cloud-controller-manager"]
  kubernetes_sd_configs:
  - role: endpoints
    namespaces:
      names: [default]
  bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
  tls_config: {ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt, server_name: kubernetes,
               insecure_skip_verify: false}
  relabel_configs:
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: apiserver
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_service_label_provider]
    separator: ;
    regex: kubernetes
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_endpoint_port_name]
    separator: ;
    regex: https
    replacement: $1
    action: keep
  - source_labels: [__meta_kubernetes_namespace]
    separator: ;
    regex: (.*)
    target_label: namespace
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Node;(.*)
    target_label: node
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_endpoint_address_target_kind, __meta_kubernetes_endpoint_address_target_name]
    separator: ;
    regex: Pod;(.*)
    target_label: pod
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: service
    replacement: $1
    action: replace
  - source_labels: [__meta_kubernetes_service_name]
    separator: ;
    regex: (.*)
    target_label: job
    replacement: ${1}
    action: replace
  - source_labels: [__meta_kubernetes_service_label_component]
    separator: ;
    regex: (.+)
    target_label: job
    replacement: ${1}
    action: replace
  - {separator: ;, regex: (.*), target_label: endpoint, replacement: https, action: replace}

  • Prometheus告警规则

    - alert: AckCCMWarning
  annotations:
    message: CCM is not available in last 3 minutes. Please check the prometheus job and target status.
  expr: |
    (absent(up{job="ack-cloud-controller-manager",pod!=""}) or (count(up{job="ack-cloud-controller-manager",pod!=""}) <= 0)) == 1
  for: 3m
  labels:
    severity: critical

  • 监控采集指标清单

    cloud-controller-manager监控采集指标清单，请参见cloud-controller-manager指标清单。

ACK Pro集群外部监控

如果需要使用ACK Pro集群外的Prometheus来监控Kubernetes集群，具体操作，请参见Configuration和Monitoring kubernetes with prometheus from outside of k8s cluster。主要配置如下：

  - job_name: 'out-of-k8s-scrape-job'
    scheme: https
    tls_config:
      ca_file: /etc/prometheus/kubernetes-ca.crt
    bearer_token: '<SERVICE ACCOUNT BEARER TOKEN>'

    kubernetes_sd_configs:
      - api_server: 'https://<KUBERNETES URL>'
        role: node
        tls_config:
          ca_file: /etc/prometheus/kubernetes-ca.crt
        bearer_token: '<SERVICE ACCOUNT BEARER TOKEN>'

验证效果

  1. 登录自建的Prometheus控制台，切换到Graph页面。

  2. 输入up，查看是否全部控制平面组件都可以显示。

    up

    预期输出：

    自定义

    重要

    • up{instance="x.x.x.x:6443", job="ack-api-server"}是作为代理的Endpoint状态。其中，x.x.x.x是K8s集群default命名空间下Kubernetes Service的IP，不同用户集群该IP不同。

    • up{instance="controlplane-xyz", job="ack-api-server", pod="controlplane-xyz"}是具体控制面Pod的状态。可以使用该up指标为控制面Pod做探活检测。

  3. 输入以下指标，查看是否可以正常显示。

    apiserver_request_total{job="ack-api-server"}

    预期输出：

    显示2

    如果界面能正常显示查询的指标和数据，说明自建Prometheus可以正常采集控制平面核心组件指标。

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