NGINX学习笔记——Choosing an Outgoing IP Address

原文地址：https://www.nginx.com/resources/admin-guide/reverse-proxy/
原文标题：Choosing an Outgoing IP Address

如果你的代理服务器有多个网络接口，有时候你可能会需要选择特定的源IP地址连接被代理服务器或者上游服务器。如果NGINX后面的一个被代理服务器设置为只接受特定IP网络或者IP地址范围的连接，这种配置就能派上用场了。
If your proxy server has several network interfaces, sometimes you might need to choose a particular source IP address for connecting to a proxied server or an upstream. This may be useful if a proxied server behind NGINX is configured to accept connections from particular IP networks or IP address ranges.

指定proxy_bind指令并设置网络接口的IP地址：
Specify the proxy_bind directive and the IP address of the necessary network interface:

location /app1/ {
    proxy_bind 127.0.0.1;
    proxy_pass http://example.com/app1/;
}

location /app2/ {
    proxy_bind 127.0.0.2;
    proxy_pass http://example.com/app2/;
}

IP地址也可以用变量指定。例如，$server_addr变量会传递接收到请求的网络接口的IP地址。
The IP address can be also specified with a variable. For example, the $server_addr variable passes the IP address of the network interface that accepted the request:

location /app3/ {
    proxy_bind$server_addr;
    proxy_pass http://example.com/app3/;
}

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以上就介绍了NGINX学习笔记——Choosing an Outgoing IP Address，包括了方面的内容，希望对PHP教程有兴趣的朋友有所帮助。