Unix Tip #4636- November 20, 2014


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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
4635 - WHAT TIME IS IT REMOTELY?
4634 - WHEN DID THAT SHELL GET DISCONNECTED?
4633 - DID MY COMMAND COMPLETE?
4632 - PM THE SYSTEMS
4631 - LABEL AND CONTROL TAPES!


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