If you have a many virtual servers and if the cron jobs can run for any 
moderate length of time then you have problems which will not be solved so 
easily.

My current hack for one virtual server I run is to have the daily cron jobs 
run 30 minutes apart (as some DomUs have jobs which run for that long) and it 
takes 8 hours to do them all.

My plan for solving this properly is to have the Dom0 manage the cron jobs.  
My current idea is that the Dom0 would instruct a DomU to run it's daily cron 
jobs and then wait for the job to finish.  After some moderate amount of time 
(maybe 30 mins) it would timeout and go to the next one (don't want to skip 
all cron jobs because of one wedged DomU).

updatedb was always a bad idea, and it's doubly bad on a virtual server.



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