go-zero微服务到k8s部署应有尽有系列（十三）服务监控

十三、服务监控

1、概述

好的服务一定是可以被及时监控的，在go-zero-looklook中我们使用目前比较流行的prometheus来作为监控工具，然后使用grafana来显示

go-zero已经在代码中给我们集成好了prometheus

// StartAgent starts a prometheus agent.
func StartAgent(c Config) {
	if len(c.Host) == 0 {
		return
	}

	once.Do(func() {
		enabled.Set(true)
		threading.GoSafe(func() {
			http.Handle(c.Path, promhttp.Handler())
			addr := fmt.Sprintf("%s:%d", c.Host, c.Port)
			logx.Infof("Starting prometheus agent at %s", addr)
			if err := http.ListenAndServe(addr, nil); err != nil {
				logx.Error(err)
			}
		})
	})
}

无论当我们启动api、rpc都会额外启动一个goroutine 提供prometheus的服务

【注】如果像我们之前order-mq这种使用serviceGroup管理的服务，在启动文件main中要显示调用一下才可以，api、rpc不需要，配置都一样

package main
.....
func main() {
	....
	// log、prometheus、trace、metricsUrl.
	if err := c.SetUp(); err != nil {
		panic(err)
	}

   ......
}

2、实现

2.1 配置prometheus与grafana

在项目下的docker-compose-env.yml文件中

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我们来deploy/prometheus/server/prometheus.yml看看prometheus配置文件

global:
  scrape_interval:
  external_labels:
    monitor: 'codelab-monitor'

# 这里表示抓取对象的配置
scrape_configs:
  - job_name: 'prometheus'
    scrape_interval: 5s  #重写了全局抓取间隔时间，由15秒重写成5秒
    static_configs:
      - targets: ['127.0.0.1:9090']

  - job_name: 'order-api'
    static_configs:
      - targets: ['order-api:9091']
        labels:
          job: order-api
          app: order-api
          env: dev
  - job_name: 'order-rpc'
    static_configs:
      - targets: ['order-rpc:9091']
        labels:
          job: order-rpc
          app: order-rpc
          env: dev
  - job_name: 'order-mq'
    static_configs:
      - targets: ['order-mq:9091']
        labels:
          job: order-mq
          app: order-mq
          env: dev
  - job_name: 'usercenter-api'
    static_configs:
      - targets: ['usercenter-api:9091']
        labels:
          job: usercenter-api
          app: usercenter-api
          env: dev
  - job_name: 'usercenter-rpc'
    static_configs:
      - targets: ['usercenter-rpc:9091']
        labels:
          job: usercenter-rpc
          app: usercenter-rpc
          env: dev
  - job_name: 'travel-api'
    static_configs:
      - targets: ['travel-api:9091']
        labels:
          job: travel-api
          app: travel-api
          env: dev
  - job_name: 'travel-rpc'
    static_configs:
      - targets: ['travel-rpc:9091']
        labels:
          job: travel-rpc
          app: travel-rpc
          env: dev
  - job_name: 'payment-api'
    static_configs:
      - targets: ['payment-api:9091']
        labels:
          job: payment-api
          app: payment-api
          env: dev
  - job_name: 'payment-rpc'
    static_configs:
      - targets: ['payment-rpc:9091']
        labels:
          job: payment-rpc
          app: payment-rpc
          env: dev
  - job_name: 'mqueue-rpc'
    static_configs:
      - targets: ['mqueue-rpc:9091']
        labels:
          job: mqueue-rpc
          app: mqueue-rpc
          env: dev
  - job_name: 'message-mq'
    static_configs:
      - targets: ['message-mq:9091']
        labels:
          job: message-mq
          app: message-mq
          env: dev
  - job_name: 'identity-api'
    static_configs:
      - targets: ['identity-api:9091']
        labels:
          job: identity-api
          app: identity-api
          env: dev
  - job_name: 'identity-rpc'
    static_configs:
      - targets: [ 'identity-rpc:9091' ]
        labels:
          job: identity-rpc
          app: identity-rpc
          env: dev