prometheus自动发现pod配置

prometheus自动发现pod配置

按照传统的方法来部署prometheus监控实际发现，新增某个东西的时候都要去一个个配置job很麻烦，不如自动发现pod和svc，把新生成的pod和svc等资源，自动加入到系统的pod和svc监控中去。实际上我们使用的官方k8s部署prometheus已经帮我们完成。我们在部署pod和svc的时候增加配置即可。

部署自动发现redis

要想自动发现集群中的 Service，就需要在 Service 的annotation区域添加：prometheus.io/scrape=true的声明，要自动发现集群中的 pod，也需要我们在 pod 的annotation区域添加：prometheus.io/scrape=true的声明

部署redis

cat > redis-deploy.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: redis
  namespace:
spec:
  selector:
    matchLabels:
      app: redis
  template:
    metadata:
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9121"
      labels:
        app: redis
    spec:
      containers:
      - name: redis
        image: redis:latest
        imagePullPolicy: IfNotPresent
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        env:
          - name: TZ
            value: Asia/Shanghai
        ports:
        - containerPort: 6379
      - name: redis-exporter
        image: oliver006/redis_exporter:latest
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 9121
EOF

# 创建redis
kubectl apply -f redis-deploy.yaml

创建redis 服务

cat >redis-service.yml <<EOF
apiVersion: v1
kind: Service
metadata:
  namespace:
  name: redis
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/port: "9121"
  labels:
    app: redis
spec:
  type: ClusterIP
  ports:
  - name: redis
    port: 6379
    targetPort: 6379
  - name: prom
    port: 9121
    targetPort: 9121
  selector:
    app: redis
EOF

# 创建svc
 kubectl apply -f redis-service.yml

部署nginx

cat >nginx-deploy.yaml <<EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: nginx
  namespace:
spec:
  selector:
    matchLabels:
      app: nginx
  replicas: 1
  template:
    metadata:
      annotations:
        prometheus.io/scrape: "true"
        prometheus.io/port: "9113"
      labels:
        app: nginx
    spec:
      containers:
      - name: nginx
        image: nginx
        imagePullPolicy: IfNotPresent
        ports:
        - containerPort: 80
      - name: nginx-exporter
        image: fish/nginx-exporter
        resources:
          requests:
            cpu: 100m
            memory: 100Mi
        ports:
        - containerPort: 9113
EOF

# 创建nginx
kubectl apply -f nginx-deploy.yaml

创建nginx 服务

cat >nginx-service.yaml <<EOF
apiVersion: v1
kind: Service
metadata:
  namespace:
  name: nginx
  annotations:
    prometheus.io/scrape: "true"
    prometheus.io/port: "9113"
  labels:
    app: nginx
spec:
  type: ClusterIP
  ports:
  - name: nginx
    port: 80
    targetPort: 80
  - name: fish
    port: 9113
    targetPort: 9113
  selector:
    app: nginx
EOF

# 创建nginx 服务
kubectl apply -f nginx-service.yaml

创建完成后，在prometheusui界面的status——>Service Discovery可以看到。