promethues在k8s中启动服务自动发现功能

前言：

k8s天生支持promethues的指标采集，无须额外提供/metric接口；在k8s环境中，promethues通过与k8s API集成完成自动发现功能，支持服务发现的模式包括：node、service、pod、endpoints、ingress;

一、自动发现的来源：

promethues 支持服务发现的来源类型包括：

azure_sd_configs、consule、dns、ec2、openstack、file、gce、kubernetes_sd_configs、marathon、nerve、triton、file_sd_configs

二、k8s下配置promethues的服务发现：

 

kind: ConfigMap
apiVersion: v1
metadata:
  name: prometheus-config
data:
  prometheus.yml: |-
    global:
      scrape_interval:     15s 
      evaluation_interval: 15s
    scrape_configs:

    - job_name: 'kubernetes-nodes'
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: node

    - job_name: 'kubernetes-service'
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: service

    - job_name: 'kubernetes-endpoints'
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: endpoints

    - job_name: 'kubernetes-ingress'
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: ingress

    - job_name: 'kubernetes-pods'
      tls_config:
        ca_file: /var/run/secrets/kubernetes.io/serviceaccount/ca.crt
      bearer_token_file: /var/run/secrets/kubernetes.io/serviceaccount/token
      kubernetes_sd_configs:
      - role: pod