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

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

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