Wow,
I apologize for being vague and demanding, I have an earnest desire to
learn, and I hope that my learning will benefit others.
Let me try to approach this problem again:
I was hoping that someone could point me in the direction of some
helpful ways to analyze this (Centos 4.3) system. It was acting very
strangely yesterday. I received emails complaining that:
- none of the links were working (it was a vague complaint)
- the javascript version of our RSS feed had a 14 second load time
( http://www.insurancejournal.com/newsfeed/feed.php )
I have never had to track down a problem like this and i have spent a
good deal of the morning looking into options for the 'top' command,
(because i had read in a Novel book that it was useful for diagnosing
bottlenecks). I saw that there were a lot of mysql and httpd processes
going, but i figured that was just lots of people visiting the site, or
editors working on stories.
After not being able to find anything helpful (that i could take action
on), I ended up trying the vmstat command (got the idea here:
http://www.cyberciti.biz/tips/linux-resource-utilization-to-detect-system-bottlenecks.html).
The websites are set up to have their own log files, which are quite
numerous so I ran the command:
find . -type f -printf '%TY-%Tm-%Td %TT %p\n' | sort |less
from the logfiles directory to see which one has been modified last,
then I looked at the most recent logfile with a 'tail -f' and saw that
it was being written incredibly fast.
the repeating error was:
File does not exist: /var/www/www.insurancejournal.com/web/news
it was my understanding that this was not a directory and it was just
done through some sort of URL re-write.
Continuing to try to trouble shoot the issue i created the news
directory. The error then changed to:
File does not exist: /var/www/www.insurancejournal.com/web/news/east
File does not exist: /var/www/www.insurancejournal.com/web/news/west
and so on.
Part of the reason for re-writing URLS (at least one reason I like it)
it that you can make one PHP file look like a ton of HTML files. I could
see that something is likely to be wrong with the re-write system, but I
am wondering what suggestions (tools) some of the 'more seasoned' system
admins might have to help me track down this issue or even a better
approach to problem solving.
Any tips would be greatly appreciated.
Many Thanks
Walt Reed wrote:
On Tue, Dec 12, 2006 at 09:36:08AM -0800, Administrator said:
Yesterday our website was acting a little odd, and i received a few
email complaints. Running 'top' showed that we had a very high load
average, today the load average is even higher!
load average: 13.18, 12.49, 10.48
It is pretty unlikely that our site grew in popularity that quickly, and
taking a look at the log file it was saying that a certain directory was
not found, when in fact it was just a mod-re-write rule and was not
supposed to exist. The website works fine... i am stumped and the error
log is getting quite big! Does anyone have any tips on how to find the
problem and address it accordingly (quickly)?
Many thanks
Patient: Doctor, I am ill, but I can't tell you any details. What can I
do to feel better?
Doctor: Well, it would be helpful if you give me some more details, or
I could ask you about 10,000 questions and we can be here all month...
Seriously, please read:
http://linuxmafia.com/faq/Essays/smart-questions.html
Then look at your log files. The contents will probably give you your
answer anyway.
Thanks.
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--
Noah Spahn
Tech Manager/Systems Administrator
Wells Publishing Inc
(619)584-1100 ext.122
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