Thank you. I gather from this that I can safely halt or reboot while a disk is mounted, right? --- January 17, 2012 Milan Broz sent: --- On 01/16/2012 03:48 PM, Marc Schwarzschild wrote: > I am setting up an external USB encrypted drive. I can mount it > manually after I boot the computer. I understand that I must > issue the 'cryptsetup luksClose' after I umount the disk. How do > I arrange for this as part of the Debian halt process so it > happens automatically when the server is shutdown? It is not cryptsetup job, it should be part of initscripts/systemd to correctly unmap active devices on shutdown. (Usually it tries to unmap all crypto disks except device with root fs which is just remounted read-only. Recent systemd is able to unmouteven root device properly.) For hot-plugged disks it is usually handled by some GUI service, usually based on udisks. > What happens > if there is a power failure and 'cryptsetup luksClose' was not > executed? For LUKS, no need to worry after power failure - luksClose just remove kernel mapping (kernel state) it doesn't touch on-disk metadata at all. (Of course there can be some filesystem damage after power failure, but that's not LUKS related, it can happen even for unencrypted fs.) Milan -- _________________________________________________________ Marc Schwarzschild 212-580-1175 The Brookhaven Group, LLC _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
