nginx 新语法 limit_conn_zone 替换 limit_conn 用法

nginx自从1.1.8版本发布后将limit_conn更换为limit_conn_zone 。对应则需要修改配置文件。

官方公告：

syntax:  limit_zone name $variable size;

default:  —
context:  http

This directive is made obsolete in version 1.1.8, an equivalent limit_conn_zone directive with a changed syntax should be used instead:

limit_conn_zone $variable zone=name:size;

limit_conn_zone的描述：

When several limit_conn directives are specified, any configured limit will apply. For example, the following configuration will limit the number of connections to the server per client IP and at the same time will limit the total number of connections to the virtual host:

limit_conn_zone $binary_remote_addr zone=perip:10m;
limit_conn_zone $server_name zone=perserver:10m;

server {
…
limit_conn perip 10;
limit_conn perserver 100;
}

These directives are inherited from the previous level if and only if there are no limit_conn directives on the current level.

对应conf文件夹中的nginx.conf文件，将limit_conn替换为limit_conn_zone。使用于http

示例：

limit_conn_zone $binary_remote_addr zone=perip:10m;  #容器共使用10M的内存来对于IP传输开销

对应的虚拟主机文件，将原来的limit_conn one 替换为 limit_conn perip。使用于server

示例：

limit_conn perip 10;  # 每个IP使用10个连接。