nginx proxyPass 使用变量传递给普罗米修斯

Question

我有以下 nginx.conf

location /monitoring/prometheus/ {
  resolver 172.20.0.10 valid=5s;
  set $prometheusUrl http://prometheus.monitoring.svc.cluster.local:9090/;

  proxy_set_header Accept-Encoding "";
  proxy_pass $prometheusUrl;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;

  sub_filter_types text/html;
  sub_filter_once off;
  sub_filter '="/' '="/monitoring/prometheus/';
  sub_filter 'var PATH_PREFIX = "";' 'var PATH_PREFIX = "/monitoring/prometheus";';

  rewrite ^/monitoring/prometheus/?$ /monitoring/prometheus/graph redirect;
  rewrite ^/monitoring/prometheus/(.*)$ /$1 break;
}

当我导航到 https://myHost/monitoring/prometheus/graph我被重定向到/graph ( https://myHost/graph )

当我不使用变量并将 url 直接放置到 proxy_pass 时，一切都按预期工作。我可以导航到 https://myHost/monitoring/prometheus/graph并看到普罗米修斯。

location /monitoring/prometheus/ {
  resolver 172.20.0.10 valid=5s;

  proxy_set_header Accept-Encoding "";
  proxy_pass http://prometheus.monitoring.svc.cluster.local:9090/;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;

  sub_filter_types text/html;
  sub_filter_once off;
  sub_filter '="/' '="/monitoring/prometheus/';
  sub_filter 'var PATH_PREFIX = "";' 'var PATH_PREFIX = "/monitoring/prometheus";';

  rewrite ^/monitoring/prometheus/?$ /monitoring/prometheus/graph redirect;
  rewrite ^/monitoring/prometheus/(.*)$ /$1 break;
}

谁能向我解释为什么在路由方面使用该变量会导致不同的行为？我需要使用变量来强制 nginx 解析每个请求的 dns 名称。

Answer 1

我只是想通了。
如 docs 中所述

When variables are used in proxy_pass:

location /name/ {
    proxy_pass http://127.0.0.1$request_uri;
}

In this case, if URI is specified in the directive, it is passed to the server as is, replacing the original request URI.

所以问题是我在变量(尾随/)中指定了一个请求 uri。
删除此后/一切正常。

这里的工作配置:

location /monitoring/prometheus/ {
  set $prometheusUrl http://prometheus.monitoring.svc.cluster.local:9090;

  proxy_set_header Accept-Encoding "";
  proxy_pass $prometheusUrl;
  proxy_redirect off;
  proxy_set_header Host $host;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header X-Forwarded-Proto $scheme;

  sub_filter_types text/html;
  sub_filter_once off;
  sub_filter '="/' '="/monitoring/prometheus/';
  sub_filter 'var PATH_PREFIX = "";' 'var PATH_PREFIX = "/monitoring/prometheus";';

  rewrite ^/monitoring/prometheus/?$ /monitoring/prometheus/graph redirect;
  rewrite ^/monitoring/prometheus/(.*)$ /$1 break;
}