Prometheus 监控 Nginx 状态

1、使用 nginx-vts-exporter 监控 nginx 状态，前提条件是 nginx 要编译进 nginx-module-vts 模块

2、下载 openresty 安装包和 nginx-module-vts 模块安装包

// 下载地址：http://openresty.org/cn/download.html
# ll /usr/local/src/openresty-1.13.6.2.tar.gz 
-rw-r--r-- 1 root root 4635916 Nov 26 14:09 /usr/local/src/openresty-1.13.6.2.tar.gz
// 下载地址：https://github.com/vozlt/nginx-module-vts/releases
# ll /usr/local/src/nginx-module-vts-0.1.18.tar.gz 
-rw-r--r-- 1 root root 380327 Nov 26 14:13 /usr/local/src/nginx-module-vts-0.1.18.tar.gz

3、编译安装 openresty

# cd /usr/local/src 
# tar xf openresty-1.13.6.2.tar.gz 
# tar xf nginx-module-vts-0.1.18.tar.gz
# cd openresty-1.13.6.2 
// 加上 --add-module=/usr/local/src/nginx-module-vts-0.1.18 编译选项
# ./configure --prefix=/usr/local/openresty --with-luajit --with-pcre --with-http_iconv_module --with-http_realip_module --with-http_sub_module --with-http_stub_status_module --with-stream --with-stream_ssl_module --add-module=/usr/local/src/nginx-module-vts-0.1.18
# make build install 

4、nginx.conf 配置添加 vhost_traffic_status_zone;

user  nobody;
worker_processes  auto;

error_log syslog:server=10.1.9.40:12302;
pid        logs/nginx.pid;


events {
    worker_connections  10240;
}


http {
    include       mime.types;
    default_type  application/octet-stream;

    log_format graylog2_json escape=json '{ "timestamp": "$time_iso8601", '
                     '"remote_addr": "$remote_addr", '
                     '"body_bytes_sent": $body_bytes_sent, '
                     '"request_time": $request_time, '
                     '"response_status": $status, '
                     '"request": "$request", '
                     '"request_method": "$request_method", '
                     '"host": "$host",'
                     '"upstream_cache_status": "$upstream_cache_status",'
                     '"upstream_addr": "$upstream_addr",'
                     '"http_x_forwarded_for": "$http_x_forwarded_for",'
                     '"http_referrer": "$http_referer", '
                     '"http_user_agent": "$http_user_agent" }';

    access_log  logs/access.log  graylog2_json;

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    gzip  on;

    client_max_body_size 10m;

    vhost_traffic_status_zone;

    include /usr/local/openresty/nginx/conf/conf.d/*.conf;
}

5、要监控的站点添加配置 /vts_status

server
{
    listen 80;
    server_name www.x.cn x.cn;
    access_log syslog:server=10.1.9.40:12301 graylog2_json;

    location  / {
        return 301 https://$server_name$request_uri;
    }
    location /vts_status {
        vhost_traffic_status_display;
        vhost_traffic_status_display_format html;
        allow 127.0.0.1;
        deny all;
    }
}

6、测试请求是否能获取到数据
# curl http://127.0.0.1/vts_status/format/json

7、安装 nginx-vts-exporter

# mkdir /usr/local/nginx-vts-exporter -p
// 下载地址：https://github.com/hnlq715/nginx-vts-exporter/releases
# ll /usr/local/nginx-vts-exporter/nginx-vts-exporter 
-rwxr-xr-x 1 root root 9982855 Nov 22 15:41 /usr/local/nginx-vts-exporter/nginx-vts-exporter

// 配置 nginx-vts-exporter.service
[Unit]
Description=nginx-vts-exporter
After=network.target

[Service]
Type=simple
ExecStart=/usr/local/nginx-vts-exporter/nginx-vts-exporter -nginx.scrape_uri=http://127.0.0.1/vts_status/format/json
Restart=on-failure

[Install]
WantedBy=multi-user.target

// 启动服务，nginx-vts-exporter 默认监听端口为 9913
# systemctl enable nginx-vts-exporter
# systemctl start nginx-vts-exporter
# systemctl status nginx-vts-exporter

8、prometheus 配置

// prometheus.yml 配置监控规则
  - file_sd_configs:
    - files:
      - 'configs/nginx.yml'
    job_name: Nginx Server
    metrics_path: /metrics
    relabel_configs:
    - source_labels: [__address__]
      regex: (.*)
      target_label: instance
      replacement: $1
    - source_labels: [__address__]
      regex: (.*)
      target_label: __address__
      replacement: $1:9913
// configs/nginx.yml 配置要监控的主机
- labels:
    service: nginx
  targets:
  - 10.1.9.45

可以看到已经成功添加主机

9、grafana 配置
从 https://grafana.com/dashboards/2949 这里下载一个模板，导入 grafana 中即可