用prometheus监控Nginx

GitHub上官方地址：https://github.com/knyar/nginx-lua-prometheus

告警规则地址：https://awesome-prometheus-alerts.grep.to/rules#nginx

1.nginx需要支持lua功能，若是使用openresty的话，则自带支持lua

2.把lua文件上传到服务器中，

3.修改nginx配置文件，加载lua功能

# cat nginx.conf

http {

  ......

  lua_shared_dict prometheus_metrics 10M;

  lua_package_path "/path/to/nginx-lua-prometheus/?.lua;;"; # lua文件存放路径

  init_worker_by_lua_block {

    prometheus = require("prometheus").init("prometheus_metrics")

    metric_requests = prometheus:counter(

      "nginx_http_requests_total", "Number of HTTP requests", {"host", "status"})

    metric_latency = prometheus:histogram(

      "nginx_http_request_duration_seconds", "HTTP request latency", {"host"})

    metric_connections = prometheus:gauge(

      "nginx_http_connections", "Number of HTTP connections", {"state"})

  }

  log_by_lua_block {

    metric_requests:inc(1, {ngx.var.server_name, ngx.var.status})

    metric_latency:observe(tonumber(ngx.var.request_time), {ngx.var.server_name})

  }

  server {

    ......

    # 设置prometheus收集收据接口

    location /metrics {

      content_by_lua_block {

        metric_connections:set(ngx.var.connections_reading, {"reading"})

        metric_connections:set(ngx.var.connections_waiting, {"waiting"})

        metric_connections:set(ngx.var.connections_writing, {"writing"})

        prometheus:collect()

      }

    }

  }

}

4.先检测nginx配置文件，然后重启nginx，访问 http://ip:port/metrics

5.修改prometheus配置文件，加上监听nginx的配置

  - job_name: 'nginx'

    static_configs:

    - targets: ['localhost:80']

6.把nginx告警规则放在prometheus指定目录下

重启prometheus

7.grafana使用的模板

模板ID：10223

地址：https://grafana.com/grafana/dashboards/10223

另一种方式，参考网址：https://www.cnblogs.com/you-men/p/13173245.html

巴特西

用prometheus监控Nginx

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