On 05/26/2010 12:30 AM, Allan Gottlieb wrote: > For quite a while I have used the following steps to perform a > "single-user backup" > > 1. Boot to single user mode via the grub command > kernel /boot/vmlinuz root=/dev/sda6 single > > 2. Type in the root password. > > 3. Execute a single command > /usr/local/sbin/ajg-backup-init-3 > which does the backup and then executes > init 3 > > 4. This gets me to multi-user mode. > > I would like to automate this so that booting directly to multi-user > mode via > kernel /boot/vmlinuz root=/dev/sda6 > > All I need to do is to execute the single command > /usr/local/sbin/ajg-backup-init-3 > at the right moment. > This didn't seem hard; I want it after everything in boot but before > everything currently in default. So I was going to put it in > default with a "before *" in depend() > > Reading the gentoo handbook chapter B4.d "Writing Init Scripts" > I find two comments criticizing this approach > > 1. "You can also use the "*" glob [argument to before] to catch all > services in the same runlevel, although this isn't advisable". > > 2. "Note: Make sure that --exec actually calls a service and not just a > shell script that launches services and exits -- that's what the > init script is supposed to do." > > I can see problems with multiple "before *" directives, but no other > script has one so I think I would be OK with my "before *". > > Criticism 2 has me concerned since my backup routing is indeed a shell > script that exits. Indeed, my backup is not really a service so I am > worried that I shouldn't be using an initscript at all. > > Any advice/comments would be welcome. > > thanks, > allan > > You could create a LVM-snapshot of the partition/data you wish to backup at "before *" or inside "boot" and then later run the backup on the mounted snapshot, removing it afterwards.
Bye, Daniel -- PGP key @ http://pgpkeys.pca.dfn.de/pks/lookup?search=0xBB9D4887&op=get # gpg --recv-keys --keyserver hkp://subkeys.pgp.net 0xBB9D4887
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