What's the proper way to apply different connection limits to multiple virtual hosts?

[gonguinguen]

Let's say that we have two virtual hosts serving two domains: blog.com and
store.com. Let's suppose that we need to apply the following limits:
 - blog.com: no more than 5 connections per ip, and no more than 50 total
connections to the virtual host
 - store.com: no more than 10 connections per ip, and no more than 100
connections to the virtual host.

Considering that. Which would be the correct aproach?

## ---------------- Approach 1 ---------------- ##
http {
    limit_conn_zone $binary_remote_addr zone=conn_per_ip:5m;
    limit_conn_zone $server_name zone=conn_per_server:5m;
    server {
        server_name blog.com;
        limit_conn conn_per_ip 5;
        limit_conn conn_per_server 50;
        ...
    }
    server {
        server_name store.com;
        limit_conn conn_per_ip 10;
        limit_conn conn_per_server 100;
        ...
    }
    ...
}


## ---------------- Approach 2 ---------------- ##
http {
    limit_conn_zone $binary_remote_addr zone=blog_conn_per_ip:5m;
    limit_conn_zone $server_name zone=blog_conn_per_server:5m;
    server {
        server_name blog.com;
        limit_conn blog_conn_per_ip 5;
        limit_conn blog_conn_per_server 50;
        ...
    }

    limit_conn_zone $binary_remote_addr zone=store_conn_per_ip:5m;
    limit_conn_zone $server_name zone=store_conn_per_server:5m;
    server {
        server_name store.com;
        limit_conn store_conn_per_ip 10;
        limit_conn store_conn_per_server 100;
        ...
    }
    ...
}


Notice that in the first approach only two memory shared zones are declared,
while in the second approach, four of them are declared.
I appreciate any clarification on this! Thanks in advance.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,257456,257456#msg-257456