Greetings one and all,
I have a little problem I am trying to track down ...
We run a number of production boxen that are apache 2.0 with php5,
occasionally we hit MaxClients and the site becomes unreachable (until
some things time out and come back to papa). We know that some of the
time this is a database issue, the rest we suspect are php code related
issues.
What I am after is something that will give me the information from
mod_status, but without using a port 80 connection (obviously the thing
is at MaxClients and not taking connections to the server). I basically
need a full list of the requests that are being processed when this
happens and the vhosts they are being processed within (so I can track
down the actual problem).
Having asked this question elsewhere let me spell out a few things,
a) apache2ctl status [and full-status] use lynx and a connection to
the server so will not do the job (MaxClients having been hit and
the server not taking connections).
b) ps [with any options] give a process listing and does not supply
the information I require (that being the list of requests being
processed).
c) Raising MaxClients is not a solution because:
1) If I do that and we come close to MaxClients with all
processes using the average memory resources the machine will
swap out and die(tm).
2) The problem will keep occurring just with more connections
made at the time of the problem and I will still not have the
list of information I need.
d) Given that the problem is happening infrequently (at about 3 weeks
separation) polling once a second is just going to waste resources
on my server and still not provide me with what I need.
Sorry if that sounds a little abrupt, but I have had too many people
suggest all these things, assuming I hadn't thought of all of them and
their impact (infact most people don't realise the impact of what they
are suggesting).
If anyone knows of some utility (or set of options to the apache2 binary
I could use) I would be most appreciative. The other option I had
thought of was trying to get a single worker (we are using mpm-prefork)
running and listening only to loopback, but I am a little unsure if this
is actually possible or how to go about it.
Thanks in advance.
--
Nikolai Lusan
Systems Administrator
Hitwise Pty. Ltd.
Level 7 / 580 St Kilda Road
Melbourne, Victoria 3004
Australia
Phone: +61 3 8530 2400
Fax: +61 3 9529 8907
www.hitwise.com.au
nikolai.lusan@xxxxxxxxxxx
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