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List: fedora-list
Subject: Re: cron problem
From: kwhiskerz kwhiskerz <kwhiskerz () hotmail ! com>
Date: 2007-01-31 19:40:35
Message-ID: BAY124-W19E4C2EC4495CA9D9490ABA7A50 () phx ! gbl
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Javier replied:> Oftentimes, Cron is used to setup communication with other servers \
to> update Clamav or Spamassassin, maybe to run Yum check-update. The> issue is that \
if everybody is hitting the servers on the hour, we have> instataneous hourly DOS \
attacks on those servers. The random delay> prevents this by randomizing the access \
time while guaranteeing that> within the next XX minutes you will run the update.This \
makes sense for computers not in home environments.James Wilkinson wrote:> Firstly, \
the 000-delay.cron job should only delay the jobs that are run> from /etc/cron.daily \
(or /etc/cron.weekly, when a bug is fixed).> Jobs in these directories are run \
*sequentially* (one after the other)> so a long delay in 000-delay.cron will delay \
the rest of them.> > Jobs (e.g. those reminding you of football matches) that run \
directly> from a crontab won't be affected. You can easily have lots of programs> \
being run at the same time from the same crontab file -- one of them> being run-parts \
/etc/cron.daily, which is waiting for 000-delay.cron to> finish. But cron won't be \
waiting, and will still run its other jobs on> time!This is true, James, but my \
backup script, which I simply drop into /etc/cron.daily IS affected. I just let it \
run along with the other system jobs and all used to be fine. I had the whole \
shitload set to run at 10 minutes past the hour and after it was done, I could turn \
off my computer. Now, I have to either let the computer run for up to 68 minutes, \
just to guarantee that the jobs even start, let alone finish. I feel the best option \
to reintroduce full error-free functionality is to disable the delay \
script.kwhiskerz{ _________________________________________________________________
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<body><div style="text-align: left;"><pre>Javier replied:<br>> Oftentimes, Cron is \
used to setup communication with other servers to<br>> update Clamav or \
Spamassassin, maybe to run Yum check-update. The<br>> issue is that if everybody \
is hitting the servers on the hour, we have<br>> instataneous hourly DOS attacks \
on those servers. The random delay<br>> prevents this by randomizing the access \
time while guaranteeing that<br>> within the next XX minutes you will run the \
update.<br><br>This makes sense for computers not in home environments.<br><br>James \
Wilkinson wrote:<br>> Firstly, the 000-delay.cron job should only delay the jobs \
that are run<br>> from /etc/cron.daily (or /etc/cron.weekly, when a bug is \
fixed).<br>> Jobs in these directories are run *sequentially* (one after the \
other)<br>> so a long delay in 000-delay.cron will delay the rest of them.<br>> \
<br>> Jobs (e.g. those reminding you of football matches) that run \
directly<br>> from a crontab won't be affected. You can easily have lots of \
programs<br>> being run at the same time from the same crontab file -- one of \
them<br>> being run-parts /etc/cron.daily, which is waiting for 000-delay.cron \
to<br>> finish. But cron won't be waiting, and will still run its other jobs \
on<br>> time!<br><br><br>This is true, James, but my backup script, which I simply \
drop into /etc/cron.daily IS affected. I just let it run along with the other system \
jobs and all used to be fine. I had the whole shitload set to run at 10 minutes past \
the hour and after it was done, I could turn off my computer. Now, I have to either \
let the computer run for up to 68 minutes, just to guarantee that the jobs even \
start, let alone finish. I feel the best option to reintroduce full error-free \
functionality is to disable the delay script.</pre></div><br>kwhiskerz{<br><br /><hr \
/>Stay up-to-date with your friends through the Windows LiveT Spaces friends list. \
<a href='http://spaces.live.com/spacesapi.aspx?wx_action=create&wx_url=/friends.aspx&mkt=en-us' \
target='_new'>Check it out!</a></body> </html>
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