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Lots of good links like...
Stripping down a standard Raspbian installation | Technology ... http://blog.qruizelabs.com/2014/04/23/stripping-down-a-standard-raspbian-installation/
Also remove Scratch... Minecraft.. Etc...
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The watchdog daemon does several tests to check the system status:
· Is the process table full?
· Is there enough free memory?
· Are some files accessible?
· Have some files changed within a given interval?
· Is the average work load too high?
· Has a file table overflow occurred?
· Is a process still running? The process is specified by a pid file.
· Do some IP addresses answer to ping?
· Do network interfaces receive traffic?
· Is the temperature too high? (Temperature data not always
available.)
· Execute a user defined command to do arbitrary tests.
If any of these checks fail watchdog will cause a shutdown. Should any
of these tests except the user defined binary last longer than one
minute the machine will be rebooted, too.
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