Nginx的server为0.0.0.0/0.0.0.1的作用？

看到kong默认的代理和后台server 都是0.0.0.0，代理到上游的服务器proxy_pass $upstream_scheme://kong_upstream;配置如下，

upstream kong_upstream {

    server 0.0.0.1;

    balancer_by_lua_block {

        kong.balancer()

    }

    keepalive 60;

}

监听的IP地址设置了 0.0.0.0 就表示你的nginx服务器监听本机的所有IP地址上,通过任何一个IP地址都可以访问到.

当发送数据的一方还不知道接收方的IP地址时，会在目的IP地址字段中使用0.0.0.0，表示未知IP地址（有时还用于表示无效IP地址）。

In the Internet Protocol Version 4, the address 0.0.0.0 is a non-routable meta-address used to designate an invalid, unknown or non-applicable target. To give a special meaning to an otherwise invalid piece of data is an application of in-band signaling.
In the context of servers, 0.0.0.0 means "all IPv4 addresses on the local machine". If a host has two IP addresses, 192.168.1.1 and 10.1.2.1, and a server running on the host listens on 0.0.0.0, it will be reachable at both of those IPs.
In the context of routing, 0.0.0.0 usually means the default route, i.e. the route which leads to "the rest of" the internet instead of somewhere on the local network.

wiki地址

巴特西