nginx的fastcgi_pass支持变量吗？

Question

我想使用nginx和fastcgi_pass进行动态主机解析。当在配置中设置fastcgi_pass $wphost:9000;时，nginx会显示错误[error] 7#7: *1 wordpress.docker could not be resolved (3: Host not found)。但是，当我设置fastcgi_pass wordpress.docker:9000;时，它可以正常工作，除了在wordpress重新启动后nginx仍然指向旧的IP地址。请参考此链接以解决问题。

server {
  listen [::]:80;
  include /etc/nginx/ssl/ssl.conf;

  server_name app.domain.*;

  root /var/www/html;
  index index.php index.html index.htm;

  resolver 172.17.42.1 valid=60s; 
  resolver_timeout 3s;

  location / {
    try_files $uri $uri/ /index.php?q=$uri&$args; ## First attempt to serve request as file, then as directory, then fall back to index.html
  }

  #error_page 404 /404.html;
  error_page 500 502 503 504 /50x.html;
  location = /50x.html {
    root /usr/share/nginx/html;
  }

  set $wphost wordpress.docker;  

  # pass the PHP scripts to FastCGI server listening on wordpress.docker
  location ~ \.php$ {
    client_max_body_size    25M;
    try_files               $uri =404;
    fastcgi_split_path_info ^(.+\.php)(/.+)$;
    fastcgi_pass            $wphost:9000;
    fastcgi_param           SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param           SCRIPT_NAME $fastcgi_script_name;
    fastcgi_index           index.php;
    include                 fastcgi_params;
  }

  location ~* \.(jpg|jpeg|gif|png|css|js|ico|xml)$ {
    add_header        Pragma public;
    add_header        Cache-Control "public, must-revalidate, proxy-revalidate";
    access_log        off;
    log_not_found     off;
    expires           168h;
  }

  # deny access to . files, for security
  location ~ /\. {
        access_log    off;
        log_not_found off; 
        deny          all;
  }

}

我有不同的虚拟主机配置，其中我使用 proxy_pass http://$hostname;。在这个设置中，一切都按预期工作，并且主机被找到。

尝试了不同的选项后，我想知道 fastcgi_pass 是否支持变量。

- Vad1mo

---

wordpress.host，还是wordpress.docker？ - Ry-

wordpress.docker 是正确的域名。我相应地更新了我的问题。 - Vad1mo

这里是+1。我正在使用fastcgi_pass连接到AWS内部ELB，但它的IP地址会随时间变化。仍在寻找解决方案。 - Pahud Hsieh

也许这可以帮助一点：https://www.ruby-forum.com/topic/173585 - Max Schindler

你好，你找到如何在fastcgi_pass中使用变量的解决方案了吗？ - Sergey Didanov

Answer 1

如果你将upstream作为变量传递，它就可以工作，例如：

upstream fastcgi_backend1 {
   server php_node1:9000;
}

upstream fastcgi_backend2 {
   server php_node2:9000;
}

server {
    listen 80;
    server_name _;

    set $FASTCGI_BACKEND1 fastcgi_backend1;
    set $FASTCGI_BACKEND2 fastcgi_backend2;
    
    location ~ ^/site1/index.php$ {
        fastcgi_pass   $FASTCGI_BACKEND1;
    }

    location ~ ^/site2/index.php$ {
        fastcgi_pass   $FASTCGI_BACKEND2;
    }
}

- Jared Chu