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Apache: How to Limit the number of connection per virtual host

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I am using Apache 2.2 on LE for several years now and I use intensively the virtual host mechanism (300 virtual hosts per http instance).

As soon as you start sharing resources between applications, you want to protect your platform and prevent an application from taking all the threads and cause a resource starvation for the others.

To do so i used the third party mod_qos module to limit the number of simultaneous connections per virtual hosts. Now that i intend to migrate to Apache 2.4, my first tests reveal that this module is not compatible with this version of Apache, thats also the warning that developer raised for his module.

It appears that I don't find any real alternative to substitute the mod_qos module with something else. Here are my questions :
- Can you confirm that Apache does not provide any mechanism allowing to limit the number of connection per virtual host, just to be sure that I am not missing something ?
- Why Apache doesn't provide such a functionality ? :) From my very humble user perspective, I am surprised that this is not a native functionality as it seems to me that my need is probably shared by many users. Moreover Apache provides many other complex functionalities, the one I am describing would be probably something simple to implement compared to other functionalities already available.

posted Jun 12, 2015 by Jagan Mishra

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1 Answer

+1 vote
  • Can you confirm that Apache does not provide any mecanism allowing to limit the number of connection per virtual host, just to be sure that im not missing something ?

Apache doesnt provide it.

  • Why Apache doesnt provide such a functionality ? :) From my very humble user perspective, im surprised that this is not a native functionality as it seems to me that my need is probably shared by many users. Moreover Apache provides many other complex functionalities, the one im describing would be probably something simple to implement compared to other functionalities already available.

Nothing special for this function -- not enough interest/time for people in the project to write/test/support such a thing

answer Jun 12, 2015 by Tarun Singhal
Thank you for your feedback. But do you protect your platform then without such a functionality ?
Bear in mind that you only know which virtual host is requested when you read the Host: header, which is after you already accepted the connection.

There are third-party modules for managing loads and protecting a server from attack. Some of them might be worth a look.
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