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:

<code>location <span>/app1/</span> {
    proxy_bind <span>127.0</span><span>.0</span><span>.1</span>;
    proxy_pass <span>http</span>:<span>//</span>example.com<span>/app1/</span>;
}</code>

<code>location <span>/app2/</span> {
    proxy_bind <span>127.0</span><span>.0</span><span>.2</span>;
    proxy_pass <span>http</span>:<span>//</span>example.com<span>/app2/</span>;
}</code>

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:

<code>location /app3/ {
    proxy_<span>bind</span><span>$server_addr</span>;
    proxy_pass http://example.com/app3/;
}</code>

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