Prometheus监控Nginx

环境

系统：CentOS 7.5

准备

• Nginx添加Lua扩展

Nginx端

• 下载lua脚本
  地址：https://github.com/knyar/nginx-lua-prometheus

• 复制lua脚本

  # cp prometheus.lua /usr/local/lib/lua/5.1/
  

• 添加Nginx配置

  # vim /etc/nginx/conf.d/prometheus.conf
  lua_shared_dict prometheus_metrics 10M;
  lua_package_path "/usr/local/lib/lua/5.1/?.lua";
  init_by_lua '
          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 '
          metric_requests:inc(1, {ngx.var.server_name, ngx.var.status})
          metric_latency:observe(tonumber(ngx.var.request_time), {ngx.var.server_name})
  ';
  
  
  server {
          listen 9145;
          server_name xxx.your.domain.com;  
  
          location /metrics {
                  content_by_lua '
                  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()
                  ';
          }
  }
  

• 重启Nginx

  # systemctl restart nginx
  

Prometheus端

• 配置Prometheus

  # vim /usr/local/prometheus/prometheus.yml
  scrape_configs:
    - job_name: 'Nginx'
    static_configs:
      - targets:
        - 10.10.10.1:9145
  

• 重启Prometheus

  # systemctl restart prometheus
  

Grafana端

• 添加dashboards
  点击Create - Import，输入dashboards的id（推荐462）