concurrent users on a website

[Andreas Ericsson]

Harry John wrote:
> Hi
> How do we check concurrent users in a website?

HTTP is a stateless protocol. There is no such thing as an exact count of
concurrent users on a website. All sites that claim to track such thing
do some sort of estimation. Usually based on how many users have been
active within the last 5 minutes or some such. Depending on the software
running on the site, this is determined in different ways. Usually it
happens by running a query such as this against some sql database:

  select count(id) from users where last_active > $now - 300

where the 'last_active' column is always updated when a user clicks on
anything on the site and $now is a variable representing the current
timestamp as given in seconds since the unix epoch.

> Is this possibble in nagios friends?

Yes, but not with a standard plugin. See my response above and you should
have a pretty decent idea of how to implement such a plugin yourself.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

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