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UGU: Unix Guru Universe - Unix Tip #4305- December 24, 2012 - Home : Help : Today's Tip
Unix Tip #4305- December 24, 2012

REBOOTING BECAUSE OF FORK BOMBS



There is nothing more frustrating
for an Administrator who has to
reboot system due to fork bomb

(the number of processes in the
system reaches the maximum limit
when a user, even a superuser,
tries to execute some command, the
system will respond with Vfork
failed)

In Solaris under SPARC, this can be
controlled by specifying a line in
/etc/system

set maxuprc=64

And reboot the system. Now a user
can have maximum of 64 processes
under his ownership. By default
the 'maxuprc' value is
16*maxusers - 5 where
'maxusers' is another tunable
parameter in /etc/system

Caution : You should have a backup
of /etc/system file before you make
the changes. So that you can revert
back to old system file using
boot -a option in case of
inconsistent system file.

NOTE: All tips provided are USE AT YOUR OWN RISK. Tips are submitted by various unix admins around the globe. UGU suggest you read and test each tip in a non-volitile environment before placing into production.


LAST 5 TIPS
4304 - WHAT TIME IS IT REMOTELY?
4303 - OUTAGE LENGTHS
4302 - GROOMING FILES
4301 - ECHO REDIRECT ANYWHERE
4300 - WHAT FILE IS THAT IN?


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