K8s 下通过prometheus监控 nginx

k8s 下有两个版本的nginx ingress  分别是 

ingress nginx   以及 nginx ingress 

Ingress-nginx 与 Nginx-ingress - LeoZhanggg - 博客园

这里我讨论的是 nginx ingress

Nginx Ingress 使用Prometheus 导出数据

nginx ingress 本身支持通过支持这个提供prometheus 格式的 metrics 供prometheus 抓取， 需要配置  -enable-prometheus-metrics。 如果需要响应时间则需要单独配置 -enable-latency-metrics. 

Prometheus | NGINX Ingress Controller

遇到的bug

一开始看上面的教程 在deployment 中设置好参数之后，发现没有latency 相关的内容。 一看 nginx 的log 就发现了 

2024/11/23 10:33:36 [alert] 44#44: connect() failed (13: Permission denied) while logging to syslog, server: unix:/var/lib/nginx/nginx-syslog.sock
2024/11/23 10:33:36 [alert] 46#46: connect() failed (13: Permission denied) while logging to syslog, server: unix:/var/lib/nginx/nginx-syslog.sock
2024/11/23 10:33:36 [warn] 46#46: *20 send() to syslog failed while logging request, client: 192.168.65.6, server: example.api.com, request: "OPTIONS /Auth/GetUserDetail HTTP/1.1", upstream: "http://10.1.1.143:5036/Auth/GetUserDetail", host: "example.api.com:30080", referrer: "http://example.itpp.com:30080/"
2024/11/23 10:33:36 [warn] 44#44: *16 send() to syslog failed while logging request, client: 192.168.65.6, server: example.api.com, request: "OPTIONS /Auth/GetUserDetail HTTP/1.1", upstream: "http://10.1.1.143:5036/Auth/GetUserDetail", host: "example.api.com:30080", referrer: "http://example.itpp.com:30080/"

因为 nginx 读取响应时间延迟是通过首先记录API到 syslog 再通过读取syslog 产生 metrics。 如果不做特殊配置的话，虽然nginx 能够运行起来但是实际上是没有配置好 syslog 的 需要配置相关 configmap 来指定好 nginx.conf  里面 syslog 相关

apiVersion: v1
kind: ConfigMap
metadata:
  name: nginx-config
data:
  nginx.conf: |
    worker_processes  1;

    events {
        worker_connections  1024;
    }

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

        error_log syslog:server=unix:/var/lib/nginx/nginx-syslog.sock debug;
        access_log syslog:server=unix:/var/lib/nginx/nginx-syslog.sock combined;

        server {
            listen 8080;

            location /stub_status {
                stub_status;
                allow 127.0.0.1;
                allow 10.0.0.0/8;
                deny all;
            }

            location / {
                root /usr/share/nginx/html;
                index index.html;
            }
        }
    }

这样卸载 再重新安装就没有问题了。 

原文地址：https://blog.csdn.net/weixin_38990443/article/details/144004647

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