prometheus-operator 详细总结(helm一键安装)

一、介绍prometheus-operator
二、查看配置rbac授权
三、helm安装prometheus-operator
四、配置监控k8s组件
五、granafa添加新数据源
六、监控mysql
七、alertmanager配置 最后、卸载prometheus
-operator

 

一、概述

The Prometheus resource 声明性地描述了Prometheus deployment所需的状态,而ServiceMonitor描述了由Prometheus 监视的目标集

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Service

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ServiceMonitor

  通过selector匹配service。ps:这里的team:frontend,下面会提及到。通过标签选择endpoints,实现动态发现服务

  port:web  #对应service的端口名

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Prometheus

  通过matchLabels匹配ServiceMonitor的标签

  prometheus-operator 详细总结(helm一键安装)_第4张图片

  规则绑定:通过ruleSelector(匹配标签 prometheus:service-prometheus)选择PrometheusRule里面的labels  prometheus:service-prometheus

  prometheus-operator 详细总结(helm一键安装)_第5张图片

PrometheusRule

      规则配置

  prometheus-operator 详细总结(helm一键安装)_第6张图片

上面的架构配置后,使得前端团队能够创建新的servicemonitor和serive,从而允许对Prometheus进行动态重新配置

 Altertmanager

apiVersion: monitoring.coreos.com/v1
kind: Alertmanager
metadata:
  generation: 1
  labels:
    app: prometheus-operator-alertmanager
    chart: prometheus-operator-0.1.27
    heritage: Tiller
    release: my-release
  name: my-release-prometheus-oper-alertmanager
  namespace: default
spec:
  baseImage: quay.io/prometheus/alertmanager
  externalUrl: http://my-release-prometheus-oper-alertmanager.default:9093
  listenLocal: false
  logLevel: info
  paused: false
  replicas: 1
  retention: 120h
  routePrefix: /
  serviceAccountName: my-release-prometheus-oper-alertmanager
  version: v0.15.2

 

 

二、查看配置rbac授权(默认下面的不用配置

  如果激活了RBAC授权,则必须为prometheus和prometheus-operator创建RBAC规则,为prometheus-operator创建了一个ClusterRole和一个ClusterRoleBinding。

  2.1 为prometheus sa赋予相关权限

apiVersion: v1
kind: ServiceAccount
metadata:
  name: prometheus

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRole
metadata:
  name: prometheus
rules:
- apiGroups: [""]
  resources:
  - nodes
  - services
  - endpoints
  - pods
  verbs: ["get", "list", "watch"]
- apiGroups: [""]
  resources:
  - configmaps
  verbs: ["get"]
- nonResourceURLs: ["/metrics"]
  verbs: ["get"]

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: prometheus
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: prometheus
subjects:
- kind: ServiceAccount
  name: prometheus
  namespace: default

  2.2为prometheus-operator sa赋予相关权限,详细参考官方文档,这里就补贴出来了

    https://coreos.com/operators/prometheus/docs/latest/user-guides/getting-started.html

 

三、通过helm安装prometheus-operator

github官方链接

  https://github.com/helm/charts/tree/master/stable/prometheus-operator

安装命令

  $ helm install --name my-release stable/prometheus-operator

安装指定参数,比如prometheus的serivce type改为nodeport,默认为ClusterIP,(prometheus-operator service文件 官方的文档设置了cluster:None导致不能直接修改,办法是部署后,再通过kubectl -f service.yaml实现修改为nodeport

  $ helm install --name my-release stable/prometheus-operator --set prometheus.service.type=NodePort  --set prometheus.service.nodePort=30090

或者安装指定yaml文件

      $  helm install --name my-release stable/prometheus-operator  -f values1.yaml,values2.yaml

 

四、配置监控k8s组件

  4.1配置监控kubelet(默认没监控上,因为名字为kubelet的servicemonitor 使用了http方式访问endpoint的10255,我在rancher搭建的k8s上是使用https的10250端口),默认配置如下:

   prometheus-operator 详细总结(helm一键安装)_第7张图片

  参考官方文档https://coreos.com/operators/prometheus/docs/latest/user-guides/cluster-monitoring.html,修改servicemonitor,如下

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  name: kubelet
  labels:
    k8s-app: kubelet
spec:
  jobLabel: k8s-app
  endpoints: #这里默认使用http方式,而且没有使用tls,修改为如下红色配置
  - port: https-metrics
    scheme: https
    interval: 30s
    tlsConfig:
      insecureSkipVerify: true
    bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token 
  - port: https-metrics
    scheme: https
    path: /metrics/cadvisor
    interval: 30s
    honorLabels: true
    tlsConfig:
      insecureSkipVerify: true
    bearerTokenFile: /var/run/secrets/kubernetes.io/serviceaccount/token 
  selector:
    matchLabels:
      k8s-app: kubelet
  namespaceSelector:
    matchNames:
    - kube-system

     执行修改kubectl apply -f 上面的文件.yaml

   4.2配置监控kube-controller-manager

     由于我这里部署的kube-controller-manager不是pod形式启动的,而是直接容器启动,导致Service selector无法选择对应的pod,因此查看Endpoints的配置是没有subset.ip的,最后导致prometheus的target不能抓取到数据,因此我修改endpoints文件(添加红色字段的内容,ip改为master运行的主机ip),同时取消Service的selector如下:

    prometheus-operator 详细总结(helm一键安装)_第8张图片

 

     kubectl apply  -f   上面的文件.yaml

    kubectl edit svc  my-release-prometheus-oper-kube-scheduler 画面如下,把红色的selector删除,:wq保存

    prometheus-operator 详细总结(helm一键安装)_第9张图片

  4.3同理配置kube-scheduler,端口改为10252,省略。

   4.4配置etcd

   Service配置:

     prometheus-operator 详细总结(helm一键安装)_第10张图片

    ServiceMonitor配置:

      

   4.5jobLabel的作用:

    我配置Service的jobLabel为kube-schedulerservi

      prometheus-operator 详细总结(helm一键安装)_第11张图片

    target显示(刷新页面等待一些时间,才会看到结果)如下:

        prometheus-operator 详细总结(helm一键安装)_第12张图片

五、granafa添加新数据源(默认有一个数据源,为了区分应用和默认的监控,这里再添加一个应用的)

  5.1定义资源Prometheus

apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
  labels:
    app: prometheus
    prometheus: service-prometheus
  name: service-prometheus
  namespace: monitoring
spec:
    ....

  5.2 查看grafana-datasource configmap默认配置

kubectl  get configmap my-release-prometheus-oper-grafana-datasource -o yaml
apiVersion: v1
data:
  datasource.yaml: |-
    apiVersion: 1
    datasources:
    - name: service-prometheus
      type: prometheus
      url: http://service-ip:9090/ #这个没测试过,有空再研究
      access: proxy
      isDefault: true
kind: ConfigMa

  5.3修改grafana-datasource configmap

 

六、监控mysql

  要修改的默认值如下,values.yaml

mysqlRootPassword: testing
mysqlUser: mysqlu
mysqlPassword: mysql123
mysqlDatabase: mydb

metrics:
  enabled: true
  image: prom/mysqld-exporter
  imageTag: v0.10.0
  imagePullPolicy: IfNotPresent
  resources: {}
  annotations: {}
    # prometheus.io/scrape: "true"
    # prometheus.io/port: "9104"
  livenessProbe:
    initialDelaySeconds: 15
    timeoutSeconds: 5
  readinessProbe:
    initialDelaySeconds: 5
    timeoutSeconds: 1

 6.1安装mysql

  helm install --name my-release2 -f values.yaml stable/mysql    

   6.2创建pv

apiVersion: v1
kind: PersistentVolume
metadata:
  name: my-release2-mysql
spec:
  capacity:
    storage: 8Gi
  accessModes:
    - ReadWriteOnce
  persistentVolumeReclaimPolicy: Recycle
  hostPath:
    path: /data

  6.3创建mysql对应ServiceMonitor

apiVersion: monitoring.coreos.com/v1
kind: ServiceMonitor
metadata:
  labels:
    app: my-release2-mysql
    heritage: Tiller
    release: my-release
  name: my-release2-mysql
  namespace: default
spec:
  endpoints:
  - interval: 15s
    port: metrics
  jobLabel: jobLabel
  namespaceSelector:
    matchNames:
    - default
  selector:
    matchLabels:
      app: my-release2-mysql
      release: my-release2

   6.4granafa配置

  https://grafana.com/dashboards/6239 ,这里下载json模版

  然后导入granafa,datasource选择默认的就可以了。

 

七、alertmanager配置(默认不用配置)

  7.1那prometheus资源如何识别alertmanager呢?那是通过prometheus的字段alerting实现匹配alertmanager  service,如下:

  prometheus实例

apiVersion: monitoring.coreos.com/v1
kind: Prometheus
metadata:
  labels:
    app: prometheus-operator-prometheus
  name: my-release-prometheus-oper-prometheus
  namespace: default
spec:
  alerting:
    alertmanagers:
    - name: my-release-prometheus-oper-alertmanager #匹配名为my-release-prometheus-alertmanager 的service
      namespace: default
      pathPrefix: /
      port: web  
  ruleSelector:   #选择label为如下的PrometheusRule
   matchLabels:
      app: promethetus-operator  
      release: my-release

   alertmanager实例

apiVersion: monitoring.coreos.com/v1
kind: Alertmanager
metadata:
  labels:
    app: prometheus-operator-alertmanager
    chart: prometheus-operator-0.1.27
    heritage: Tiller
    release: my-release
  name: my-release-prometheus-oper-alertmanager  #secretname用到这里的name
  namespace: default
spec:
  baseImage: quay.io/prometheus/alertmanager
  externalUrl: http://my-release-prometheus-oper-alertmanager.default:9093
  listenLocal: false
  logLevel: info
  paused: false
  replicas: 1
  retention: 120h
  routePrefix: /
  serviceAccountName: my-release-prometheus-oper-alertmanager
  version: v0.15.2

  7.2 alertmanager实例如何重新读取alertmanager的配置文件配置呢???是通过prometheus-operator/deployment.yaml里面的- --config-reloader-image=quay.io/coreos/configmap-reload:v0.0.1实现

  secret22.yaml 

apiVersion: v1
data:
  alertmanager.yaml: Z2xvYmFsOgogIHJlc29sdmVfdGltZW91dDogNW0KcmVjZWl2ZXJzOgotIG5hbWU6ICJudWxsIgpyb3V0ZToKICBncm91cF9ieToKICAtIGpvYgogIGdyb3VwX2ludGVydmFsOiA1bQogIGdyb3VwX3dhaXQ6IDMwcwogIHJlY2VpdmVyOiAibnVsbCIKICByZXBlYXRfaW50ZXJ2YWw6IDEyaAogIHJvdXRlczoKICAtIG1hdGNoOgogICAgICBhbGVydG5hbWU6IERlYWRNYW5zU3dpdGNoCiAgICByZWNlaXZlcjogIm51bGwiCg==
kind: Secret #这些加密内容是alertmanager的配置参数,在linux可以通过 echo "上面data序列"|base64 -d 解密
metadata:
  labels:
    app: prometheus-operator-alertmanager
    chart: prometheus-operator-0.1.27
    heritage: Tiller
    release: my-release
  name: alertmanager-my-release-prometheus-oper-alertmanager  #必须为alertmanager-名字
  namespace: default
type: Opaque

   详情:https://github.com/helm/charts/blob/master/stable/prometheus-operator/templates/prometheus-operator/deployment.yaml

apiVersion: apps/v1beta2
kind: Deployment
metadata:
  name: my-release-prometheus-oper-operator
  namespace: default
  template:
    spec:
      containers:
      - args:
        - --kubelet-service=kube-system/my-release-prometheus-oper-kubelet
        - --localhost=127.0.0.1
        - --prometheus-config-reloader=quay.io/coreos/prometheus-config-reloader:v0.25.0
        - --config-reloader-image=quay.io/coreos/configmap-reload:v0.0.1  #通过这个容器重新加载alertmanager的配置,具体实现官网没写
        image: quay.io/coreos/prometheus-operator:v0.25.0

  PrometheusRule实现规则读取

   all.rules.yaml      参考:https://github.com/helm/charts/blob/master/stable/prometheus-operator/templates/alertmanager/rules/all.rules.yaml

apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: prometheus-operator
  labels:
    app: prometheus-operator  #Prometheus资源的ruleSelector会选择这个标签

  

   7.3 重点:重新加载alertmanager配置的操作,如下:

         7.3.1:定义alertmanager.yaml文件   

global:
  resolve_timeout: 5m
route:
  group_by: ['job']
  group_wait: 30s
  group_interval: 5m
  repeat_interval: 12h
  receiver: 'webhook'
receivers:
- name: 'webhook'
  webhook_configs:
  - url: 'http://alertmanagerwh:30500/'
ps:不能用tab作为空格,否则会报错

     7.3.2:先删除再创建名为alertmanager-{ALERTMANAGER_NAME}的secret其中{ALERTMANAGER_NAME}对应alertmanager实例名称,按照上面例子就是my-release-prometheus-oper-alertmanager)    

kubectl delete secret alertmanager-my-release-prometheus-oper-alertmanager
kubectl create secret generic alertmanager-my-release-prometheus-oper-alertmanager --from-file=alertmanager.yaml

               7.3.3 :查看是否生效

      等几秒钟中,在alertmanager的ui界面status就可以看看是否生效了。其他配置请查看https://prometheus.io/docs/alerting/configuration/

    微信告警方法   https://www.cnblogs.com/jiuchongxiao/p/9024211.html

 

最后、如何卸载prometheus-operator(重新安装,可以参考这个)

    1、直接通过helm delete删除

     $ helm delete my-release

 2、删除相关crd (helm install的时候自动安装了crd资源)

kubectl delete crd prometheuses.monitoring.coreos.com
kubectl delete crd prometheusrules.monitoring.coreos.com
kubectl delete crd servicemonitors.monitoring.coreos.com
kubectl delete crd alertmanagers.monitoring.coreos.com

   3、删除helm 上的my-release

  helm del --purge my-release

其他

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