Determine What Cron Jobs Are Killing Server And When
Jan 8, 2009
We're running on Linux/Apache/MySQL/RoR and have a number of cron jobs that run throughout the day on our server. We've been noticing lately that at certain times of the day the site becomes really slow. When I'm online with my engineers I can mention this to them and they can check and see and say "Oh yeah, it's job XYZ that's spiking the server load."
That's great but much of the time when I notice the sluggishness my developers are offline (we're in different time zones). I'm wondering if there's a fairly easy way to track this when they're not online so we can say "Yup, last night at 10 PM your time when you noticed that it was job ABC." There has to be something that allows you to do this right?
Hey everyone, my friend's dad is looking for a web host that will allow his cron jobs to run every second. Most hosts apparently dont allow cron jobs faster than 5 seconds apart.
How often a host can run cron jobs isn't really advertised on their sites so I'm having a bit of trouble finding a host. I've resorted to just sending emails to sales addresses asking about it.
I have a number of PHP scripts that I would like to automatically run daily at midnight. I am currently running a VPS server but have no idea how to achieve this. I do have webmin on my sever but am unsure of what command I need to run.
*/5 * * * * /usr/local/bin/php -c /home/USER/php.ini /home/USER/public_html/poller.php > /dev/null 2>&1 I've checked my logs, and I can find no errors anywhere. When I run the commands manually via SSH, they work perfectly, they simply are not being run automatically the way they are supposed to be.
I have checked, and the crond service is running. I have tried restarting it, but it seams to have no affect. I really have no idea what the issue is. The only thing I seam to have found at one point, was the possibility that the files within the /etc/cron.d directory might be CHMOD'ed wrong, but I haven't found anything to confirm this either way.
[root@server cron.d]# ls -all total 60 drwxr-xr-x 2 root root 4096 Dec 17 03:07 . drwx--x--x 94 root root 12288 Jan 3 09:28 .. -rw-r--r-- 1 root root 61 Jun 22 2007 csf_update -rw-r--r-- 1 root root 81 Apr 11 2007 lsm -rw-r--r-- 1 root root 79 Jun 22 2007 prm -rw------- 1 root root 366 Feb 23 2007 sa-update -rw-r--r-- 1 root root 82 Jun 22 2007 spri -rw-r--r-- 1 root root 188 Nov 16 23:14 sysstat [root@server cron.d]#
Is there any software which would control cron jobs? I've a problem with cpu load where some customers are running more than enough of them at the same time.
Is there any software which would be able to:
If there are more than x crons running at the same time, put others in queue and execute after there are no more than x-1 are running?
I have a new dedicated server and am trying to set up a cron job via CPanel on on of my accounts (we'll call it "abc" account).
In the Cron job area, where it asks for the command to run, I enter this:
/home/abc/public_html/forum/class/sendnotice.php
But when the job runs, it doesn't seem to be executing the .php file. Instead, I get stuff like this via email:
/home/acb/public_html/forum/class/sendnotice.php: line 1: ?php: No such file or directory /home/abc/public_html/forum/class/sendnotice.php: line 2: ////////////////////////////: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 3: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 4: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 5: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 6: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 7: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 8: //: is a directory /home/abc/public_html/forum/class/sendnotice.php: line 9: //: is a directory
So it is as if the cron job is reading each line of the .php file instead of just running it. Am I doing something wrong in setting up the cron job to run that file or could it be a configuration issue with the new server?
I have a fairly unique problem. My server runs great 95% of the time. Loads average under 1. However backups have become a server killer. I use cpanel scheduled backup at early morning hours. The reason backups kill my server is that I have 300,000+ (and counting) images in a directory. They are all small pngs generated by LaTeX. It takes my server several hours to backup the images. I usually even have to stop apache to free up some power. This problem is only going to get worse as I get more images. Maybe I could upgrade proc or upgrade to faster HD? That would be costly, hopefully not.
Should I hire a professional backup service? Costly, and would that help? Or is there a way of storing the images or doing the cpbackup I am doing wrong?
I have always found this odd and do not understand enough to figure it out.
Any knowledgeable people would be cool.
My datacenter has given me 2amp circuit for my computer. It seems to run fine on it.
Looking at the back of my power supply it says the following
520Watt max
Input rating 100-240v~,50-60Hz 7A-3A
Output rating +3.3V & +5V combined 150W max 12V combined current 39A max (and a lot of other stuff on amps and volts for output).
Now, Watts = Volts * Amps. So if I have 520watts and 12 volts would be 43 amps If it means 520 watts and 3.3volts it would be 157 amps However it seems to max at 39amps on the back for output.
I imagine input is all that matters here and at 520 watts and 100 to 240volts that would be 5.2 amps to 2.16 amps
And the thing says 7amps to 3 amps on the back for input.
So....I imagine that is the max it can pull before dying.
However, I have 4 drives, 4 ram sticks, and 2 quad core cpus all going and I would figure I am at least halfway or more of the power use.
Assuming a linux server / apache / php / mysql setup
I'm wondering 1) how you can find out which php script is causing problems, i assume infinite looping, crashing a server and 2) are there any measures you can take (maybe in the php or apache configuration) that can prevent such a thing from happening in the first place, other than writing good code obviously?
a log file analysis program that can tell me the exact time an ip address accesses my server and how many times that particular ip address hits the server.
Does anybody know of a package that supports this, or is it even possible?
