常见几种服务发现模式
静态服务发现：

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- job_name: 'test'
	static_configs:
 	- targets:  ['10.1.74.109:9104']

文件服务发现：
周期性自动检查特定文件内容读取加载到配置，不需要重启

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- job_name: 'file_sd_test'
    file_sd_configs:
    - refresh_interval: 15s 
      files:
      - /data/prometheus/*.yml
      - /data/prometheus/*.json

yml格式：

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- targets: ['10.1.74.109:9100']
  labels:
    app:    'ceshi'
    env:   'dev'
    region: 'dev-1'

consul：
面向分布式，提供服务注册、服务发现和配置管理。
通过exporter注册到consul服务，然后将数据汇聚到prometheus进行收集，exporter–>prometheus–>grafana，注册简单，批量监控

docker方式运行：http://$ip:8500访问正常即可

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version: "3.5"
services:
  consul:
    image: harbor.od.com/consul:latest
    container_name: consul
    volumes:
    - "/data/consul/data:/consul/data"
    - "/data/consul/config:/consul/config"
    ports:
     - "8500:8500"
    restart: always

安装测试3节点，以下使用ansible同步操作步骤，运行exporter：

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[root@k8s-master ~]# ansible all -m ping -o 
10.1.74.21 | SUCCESS => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python"}, "changed": false, "ping": "pong"}
10.1.74.22 | SUCCESS => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python"}, "changed": false, "ping": "pong"}
10.1.74.20 | SUCCESS => {"ansible_facts": {"discovered_interpreter_python": "/usr/bin/python"}, "changed": false, "ping": "pong"}

[root@k8s-master ~]# ansible all -m shell -a "docker run -itd --name node-exporter -p 9100:9100 --restart always harbor.od.com/prometheus/node-exporter:v1.3.1"

注册consul：

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[root@k8s-master ~]# cat consul.sh 
#!/bin/bash

for i in {20..22};do
	curl -X PUT -d '{
                  "id": "node'$i'",
                  "name": "node_exporter",
                  "address": "10.1.74.'$i'",
                  "port": 9100,
                  "tags": ["prometheus"],
                  "checks": [{"http": "http://10.1.74.'$i':9100/metrics","interval": "15s"}]}' \
                  http://10.1.74.109:8500/v1/agent/service/register
done
[root@k8s-master ~]# sh consul.sh

upload successful

配置prometheus

增加consul配置项完成后重启prometheus，查看已自动发现

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[root@ prometheus]# vi prometheus.yml
...
  - job_name: 'consul'
    consul_sd_configs:
    - server: '10.1.74.109:8500'

upload successful

删除服务

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[root@ prometheus]# curl -X PUT http://{cousul_ip}:8500/v1/agent/service/deregister/{ID号}