Promethues mysql_exporter 集中式监控

集中式优点

1. 无须在每个mysql主机安装mysql_exporter
2. 对于云数据库，无法安装mysql_exporter更适用

下载mysql_exporter

mysql_exporter

监控 mysql 主要是 dsn 变量

dsn = fmt.Sprintf("%s:%s@tcp(%s:%d)/", "root", "123456", target, 3306)

这里测试写死了 mysql 用与监控的账号与密码，可以用接口获取账户密码其他方式*发挥

修改mysql_exporter.go

1. newHandler 函数修改

func newHandler(metrics collector.Metrics, scrapers []collector.Scraper, logger log.Logger) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		filteredScrapers := scrapers
		// -------------- 添加部分 ---------------- //
		v:=r.URL.Query()
		params := v["collect[]"]
		target := v.Get("target")
		dsn = fmt.Sprintf("%s:%s@tcp(%s:%d)/", "root", "123456", target, 3306)
		level.Info(logger).Log("dsn",  dsn)
		// -------------- 添加部分 ---------------- //
		// Use request context for cancellation when connection gets closed.
		ctx := r.Context()
		// If a timeout is configured via the Prometheus header, add it to the context.
		if v := r.Header.Get("X-Prometheus-Scrape-Timeout-Seconds"); v != "" {
			timeoutSeconds, err := strconv.ParseFloat(v, 64)
			if err != nil {
				level.Error(logger).Log("msg", "Failed to parse timeout from Prometheus header", "err", err)
			} else {
				if *timeoutOffset >= timeoutSeconds {
					// Ignore timeout offset if it doesn‘t leave time to scrape.
					level.Error(logger).Log("msg", "Timeout offset should be lower than prometheus scrape timeout", "offset", *timeoutOffset, "prometheus_scrape_timeout", timeoutSeconds)
				} else {
					// Subtract timeout offset from timeout.
					timeoutSeconds -= *timeoutOffset
				}
				// Create new timeout context with request context as parent.
				var cancel context.CancelFunc
				ctx, cancel = context.WithTimeout(ctx, time.Duration(timeoutSeconds*float64(time.Second)))
				defer cancel()
				// Overwrite request with timeout context.
				r = r.WithContext(ctx)
			}
		}

2. main 函数修改

效果展示

Promethues mysql_exporter 集中式监控