Prometheus AlertManager 钉钉报警

本文章目前可以用于测试阶段,线上使用脚本请等我周末更新镜像替换脚本~

Prometheus AlertManager 钉钉报警

Prometheus


之前介绍过使用email报警,prometheus alertmanager是支持钉钉以及企业微信报警的,这里暂时使用钉钉告警

由于本人不会Python脚本,这里所使用的Python脚本目录之前可以将告警输出,没有进行优化

我这里使用Secret 来保存钉钉的TOKEN

Secret是用来保存小片敏感数据的k8s资源,例如密码,token,或者秘钥。这类数据当然也可以存放在Pod或者镜像中,但是放在Secret中是为了更方便的控制如何使用数据,并减少暴露的风险。

首先先获取钉钉群组token

image_1deuu616u13c027r196810371ig49.png-229.5kB

image_1deuu721u7of1bgs104j188f1e1um.png-71kB

image_1deuu7rp31jp8v6a4u91np01qsu13.png-55.6kB

在access_token=后面的就是我们需要的token,我们需要保存

https://oapi.dingtalk.com/robot/send?access_token=cde1b4fxxxxxxxxxxxxxx

接下来我们到k8s中,创建Secret

kubectl create secret generic abcdocker-dingding -n kube-system --from-literal=token=替换成钉钉群聊的机器人TOKEN

#创建完毕后,我们可以查看一下
[root@abcdocker prometheus]# kubectl get secret -n kube-system |grep abcdocker
abcdocker-dingding                               Opaque                                1      17s

创建完Secret之后,我们创建Deployment和Service

cat > abcdocker-dingding-hook.yaml <<EOF
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: abcdocker-dingding-hook
  namespace: kube-system
spec:
  template:
    metadata:
      labels:
        app: abcdocker-dingding-hook
    spec:
      containers:
      - name: abcdocker-dingding-hook
        image: registry.cn-beijing.aliyuncs.com/abcdocker/prometheus:v1
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 5000
          name: http
        env:
        - name: ROBOT_TOKEN
          valueFrom:
            secretKeyRef:
              name: abcdocker-dingding
              key: token
        resources:
          requests:
            cpu: 50m
            memory: 100Mi
          limits:
            cpu: 50m
            memory: 100Mi

---
apiVersion: v1
kind: Service
metadata:
  name: abcdocker-dingding-hook
  namespace: kube-system
spec:
  selector:
    app: abcdocker-dingding-hook
  ports:
  - name: hook
    port: 5000
    targetPort: http
EOF

这里要说一下,需要先创建Secret然后在通过deployment的yaml文件挂在上去

[root@abcdocker prometheus]# kubectl create -f abcdocker-dingding-hook.yaml
deployment.extensions/abcdocker-dingding-hook created
service/abcdocker-dingding-hook created


接下来我们检查一下pod是否正常启动
[root@abcdockerprometheus]# kubectl get pod -n kube-system |grep abc
abcdocker-dingding-hook-5b7696cd4f-6fdlw   1/1     Running     0          25s

我们可以通过日志查看webhook状态
[root@abcdocker prometheus]# kubectl get pod -n kube-system |grep abcdocker
abcdocker-dingding-hook-5b7696cd4f-6fdlw   1/1     Running     0          17m

[root@abcdocker prometheus]# kubectl logs -n kube-system abcdocker-dingding-hook-5b7696cd4f-6fdlw abcdocker-dingding-hook
 * Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)

现在我们钉钉报警已经配置完毕了,但是还需要配置触发器。因为光有环境没啥用

#首先在alertmanager上配置一个路由接收器
      - receiver: webhook
        match:
          cpu: node
          ...
    - name: 'webhook'
      webhook_configs:
      - url: 'http://abcdocker-dingding-hook:5000'
        send_resolved: true

以上是添加的参数,下面文件是我prometheus-alertmanager完整配置

apiVersion: v1
kind: ConfigMap
metadata:
  name: alert-config
  namespace: kube-system
data:
  config.yml: |-
    global:
      # 在没有报警的情况下声明为已解决的时间
      resolve_timeout: 5m
      # 配置邮件发送信息
      smtp_smarthost: 'smtp.163.com:465'
      smtp_from: 'new_oldboy@163.com'
      smtp_auth_username: 'new_oldboy@163.com'
      smtp_auth_password: 'cyh521'
      smtp_hello: '163.com'
      smtp_require_tls: false
    # 所有报警信息进入后的根路由,用来设置报警的分发策略
    route:
      # 这里的标签列表是接收到报警信息后的重新分组标签,例如,接收到的报警信息里面有许多具有 cluster=A 和 alertname=LatncyHigh 这样的标签的报警信息将会批量被聚合到一个分组里面
      group_by: ['alertname', 'cluster']
      # 当一个新的报警分组被创建后,需要等待至少group_wait时间来初始化通知,这种方式可以确保您能有足够的时间为同一分组来获取多个警报,然后一起触发这个报警信息。
      group_wait: 30s

      # 当第一个报警发送后,等待'group_interval'时间来发送新的一组报警信息。
      group_interval: 5m

      # 如果一个报警信息已经发送成功了,等待'repeat_interval'时间来重新发送他们
      repeat_interval: 5m

      # 默认的receiver:如果一个报警没有被一个route匹配,则发送给默认的接收器
      receiver: default

      # 上面所有的属性都由所有子路由继承,并且可以在每个子路由上进行覆盖。
      routes:
      - receiver: email
        group_wait: 10s
        match:
          team: node
      - receiver: webhook
        match:
          cpu: node

    receivers:
    - name: 'default'
      email_configs:
      - to: '604419314@qq.com'
        send_resolved: true
    - name: 'email'
      email_configs:
      - to: '604419314@qq.com'
        send_resolved: true
    - name: 'webhook'
      webhook_configs:
      - url: 'http://abcdocker-dingding-hook:5000'
        send_resolved: true

除了alertmanager配置文件需要修改,我们的prometheus.configmap也需要,监控指标是在prometheus.configmap上定义

#添加如下配置
      - alert: NodeMemoryUsage
        expr: sum(sum by (container_name)( rate(container_cpu_usage_seconds_total{image!=""}[1m] ) )) / count(node_cpu_seconds_total{mode="system"}) * 100 > 2
        for: 1m
        labels:
          cpu: node
        annotations:
          summary: "{{$labels.instance}}: High NodeCpu usage detected"
          description: "{{$labels.instance}}: NodeCpu usage is above 2% (current value is: {{ $value }}"

完整配置如下

apiVersion: v1
kind: ConfigMap
metadata:
  name: prometheus-config
  namespace: kube-system
data:
  prometheus.yml: |
    global:
      scrape_interval: 15s
      scrape_timeout: 15s
    alerting:
      alertmanagers:
        - static_configs:
          - targets: ["localhost:9093"]
    rule_files:
    - /etc/prometheus/rules.yml

    scrape_configs:
    - job_name: 'prometheus'
      static_configs:
      - targets: ['localhost:9090']
    - job_name: 'redis'
      static_configs:
      - targets: ['redis.abcdocker.svc.cluster.local:9121']
    - job_name: 'kubernetes-node'
      kubernetes_sd_configs:
      - role: node
      relabel_configs:
      - source_labels: [__address__]
        regex: '(.*):10250'
        replacement: '${1}:9100'
        target_label: __address__
        action: replace
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)
    - job_name: 'kubernetes-cadvisor'
      kubernetes_sd_configs:
      - role: node
      scheme: https
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      relabel_configs:
      - action: labelmap
        regex: __meta_kubernetes_node_label_(.+)
      - target_label: __address__
        replacement: kubernetes.default.svc:443
      - source_labels: [__meta_kubernetes_node_name]
        regex: (.+)
        target_label: __metrics_path__
        replacement: /api/v1/nodes/${1}/proxy/metrics/cadvisor
    - job_name: 'kubernetes-apiservers'
      kubernetes_sd_configs:
      - role: endpoints
      scheme: https
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      relabel_configs:
      - source_labels: [__meta_kubernetes_namespace, __meta_kubernetes_service_name, __meta_kubernetes_endpoint_port_name]
        action: keep
        regex: default;kubernetes;https
    - 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

  rules.yml: |
    groups:
    - name: test-rule
      rules:
      - alert: NodeMemoryUsage
        expr: (node_memory_MemTotal_bytes - (node_memory_MemFree_bytes+node_memory_Buffers_bytes + node_memory_Cached_bytes)) / node_memory_MemTotal_bytes * 100 > 50
        for: 1m
        labels:
          team: node
        annotations:
          summary: "{{$labels.instance}}: High Memory usage detected"
          description: "{{$labels.instance}}: Memory usage is above 50% (current value is: {{ $value }}"

      - alert: NodeMemoryUsage
        expr: sum(sum by (container_name)( rate(container_cpu_usage_seconds_total{image!=""}[1m] ) )) / count(node_cpu_seconds_total{mode="system"}) * 100 > 2
        for: 1m
        labels:
          cpu: node
        annotations:
          summary: "{{$labels.instance}}: High NodeCpu usage detected"
          description: "{{$labels.instance}}: NodeCpu usage is above 2% (current value is: {{ $value }}"

接下来我们来更新2个configmap文件,alertmanager和prometheus都支持热更新

kubectl delete -f prometheus-alert-conf.yaml
kubectl create -f prometheus-alert-conf.yaml
kubectl delete -f prometheus.configmap.yaml
kubectl create -f prometheus.configmap.yaml

配置完毕更新完毕后,我们直接reload
[root@abcdocker prometheus]# kubectl get svc -n kube-system |grep prometheus
prometheus                NodePort    10.96.163.206            9090:32567/TCP,9093:31212/TCP   2d8h

#通过查看svc的IP及端口进行reload
curl -X POST "http://10.96.163.206:9093/-/reload"
curl -X POST "http://10.96.163.206:9090/-/reload"

#这里需要注意的是多reload几次

没有报错后,我们打开prometheus的alerts,下面可以看到有nodeCpuusage

目前是属于等待状态

image_1dev0t0r4hkj1e1v1fn9dpsm2e1t.png-154.6kB

因为可能我的cpu还没有达到2%,所以没有触发报警

image_1dev0sans1ect77h124udi8a461g.png-114.2kB

接下来我使用grafana搜索1年前的数据,这样cpu负载就会上升

image_1dev1cjmsjhj1peqt9fsre1jc02a.png-64.1kB

这里已经触发prometheus alermanager报警

image_1dev1gk1i1vf85ap1i0o1lksn422n.png-184.1kB

这里我们可以看到报警结果

image_1dev1hv8c18bh1d8uuds1q4r1f4434.png-163.2kB

我们可以通过查看dingding-hook的pod状态

[root@abcdocker prometheus]# kubectl get pod -n kube-system |grep abc
abcdocker-dingding-hook-5b7696cd4f-6fdlw   1/1     Running     0          44m
[root@abcdocker prometheus]# kubectl logs -f -n kube-system abcdocker-dingding-hook-5b7696cd4f-6fdlw
 * Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: Do not use the development server in a production environment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:5000/ (Press CTRL+C to quit)
10.244.0.0 - - [04/Jul/2019 17:45:01] "POST / HTTP/1.1" 200 -


#这里已经显示Pod Post成功了

由于我们pod中是用一个非常简单的文本形式直接转发的,所以这里报警信息不够友好,没关系,有了这个示例我们完全就可以根据自己的需要来定制消息模板了,可以参考钉钉自定义机器人文档:https://open-doc.dingtalk.com/microapp/serverapi2/qf2nxq

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