Single user backups
Charlie Tierney - Sun San Francisco SE
clt at sun.com
Thu Dec 15 20:24:55 AEST 1988
Actually the subject is performing automatic dumps in single-user mode
(through the use of shell scripts).
In fact, the write a "dot" file and check for it's presence is the best
method to accomplish your goal. The old Fortune Systems 32:16 used to
operate in this exact way for several maintenance commands.
Let's say you want to do autodumps in single user mode. Your dump command
starts from cron and does a:
"touch /etc/.dump"
"shutdown -r +5 'Dump is about to begin - you better get off.'"
Eventually, after the reboot (see shutdown(8)), you will come through the
rc scripts. The script to muck with is /etc/rc.
In /etc/rc put in some lines that do about this:
if test -f /etc/.dump
then
/etc/BACKUP
rm /etc/.dump
fi
On the Fortune, it was a more generic capability - all unbundled software
installed a startup/shutdown/install/delete shell script into a directory:
"/m/maint/rc". The /etc/rc script looked at /m/maint/rc and ran each
script it found there. Very clean, also nice to be able to deinstall
something by typing: "/m/maint/rc/boring.rc delete'
Charlie Tierney Sun Microsystems
Writing In No Official Capacity
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