Re: [Server-devel] automount external HD
On Mon, Oct 18, 2010 at 2:56 PM, Sameer Verma sve...@sfsu.edu wrote: I haven't tested it, but if you create 92-mount.rules (or whatever 90 something is available) in /etc/udev/rules.d with this... SUBSYSTEM==block, run+=/bin/mount -a It's a clever move, but after thinking about it, it is actually pretty dangerous. So it'll work for it will probably mess up your XS big time values work. m -- martin.langh...@gmail.com mar...@laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Thu, Oct 14, 2010 at 1:15 AM, Sameer Verma sve...@sfsu.edu wrote: I am using XS-on -XO1 version 0.6. Excellent! I want to use an external USB hard drive and mount it as /library at boot time. I have added a line in /etc/fstab /dev/sda1 /library ext3 defaults 0 0 as others have noted, you probably want auto in there. The udev mount -a trick is good too. This is something I wanted to support on 0.6 but ran out of time, and has been simmering in the back of my mind for a while. This thread make me think a bit about it, and made me realise that it is currently probably pretty dangerous. Here is what is dangerous: we need /library mounted very early, and always mounted. Else, data corruption and general messiness looms. What counts on /library ? In order of seriousness... - PostgreSQL has it's DB there. And if its datadir is not there, the init script will assume it's first boot and initialise the directory. - Moodle -- needs Pg, if it finds an empty DB it will initialise one. - idmgr -- registration creates a userdir there. If it's not mounted, it will create userdirs under the directory used for the mountpoint. (Or maybe a soft failure) - backups -- probably a soft failure if /library isn't there - apache, xs-activation -- soft failures due to missing data To handle this in a less risky manner, we'd need the main services to only run if the real library is there. With that in place, the udev trick would need to extend to re-starting some services, or the services would need a supervisor script listening for the mount via inotify. Which is a lot of garbled talk to mean: it'll be fine for a test server. Where we need this to be bulletproof and failsafe, lots of work to do... cheers, m -- martin.langh...@gmail.com mar...@laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Thu, Oct 14, 2010 at 3:20 PM, Martin Langhoff martin.langh...@gmail.com wrote: On Thu, Oct 14, 2010 at 1:15 AM, Sameer Verma sve...@sfsu.edu wrote: Any ideas? I think you can configure usbmount to make a special case of your external disk. Note that you'll have to copy all the data from the preexisting /library ! Make the changes in single user mode to make sure you don't try to move the PG database or the user backups while they are running ;-) So, moving /library to the external disk in single user mode was no problem. I see a bunch of files in /etc/usbmount.d Is that where I set something up, or do I mess with /etc/usbmount/usbmount.conf? Not sure which way to proceed...a bit beyond my skill set. I'll happily follow directions and write it up if one of you can point me to an example or tell me what to do. I take it that if /library is set up in usbmount, then it is redundant in /etc/fstab? Sameer m -- martin.langh...@gmail.com mar...@laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Sat, Oct 16, 2010 at 2:00 AM, Sameer Verma sve...@sfsu.edu wrote: something up, or do I mess with /etc/usbmount/usbmount.conf? Not sure IIRC -- haven't looked at usbmount code or docs in a while... you should be able to config usbmount to recognize that drive somehow and mount it in a particular mountpoint / partition. Research required :-) m -- martin.langh...@gmail.com mar...@laptop.org -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
If you've got an /etc/fstab entry for the drive, you could tell udev to mount it. I think this'll require the auto option in fstab. I haven't tested it, but if you create 92-mount.rules (or whatever 90 something is available) in /etc/udev/rules.d with this... SUBSYSTEM==block, run+=/bin/mount -a ...It should automagically mount where fstab tells it to. But again, I haven't tested it. Just an idea. Anna Schoolfield Birmingham ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Wed, Oct 13, 2010 at 10:15:55PM -0700, Sameer Verma wrote: I want to use an external USB hard drive and mount it as /library at boot time. I have added a line in /etc/fstab /dev/sda1 /libraryext3 defaults 0 0 Might you instead mount by UUID or LABEL? However, this won't mount at boot time. There's no auto in the fourth field. -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Wed, Oct 13, 2010 at 11:19 PM, James Cameron qu...@laptop.org wrote: On Wed, Oct 13, 2010 at 10:15:55PM -0700, Sameer Verma wrote: I want to use an external USB hard drive and mount it as /library at boot time. I have added a line in /etc/fstab /dev/sda1 /library ext3 defaults 0 0 Might you instead mount by UUID or LABEL? I will try this tomorrow. However, this won't mount at boot time. There's no auto in the fourth field. I changed that to auto but that does not work either. Here's the other interesting thing. The USB drive shows up under lsusb but is not auto mounted. df -h doesn't show it. mount -a results in a /dev/sda1 does not exist. Then if I unplug the USB cable and plug it back in, the drive gets recognized and automounts twice. Once at the /library mountpoint and once at the /mnt/usb0 mountpoint. Could be a conflict between fstab and udev? Sameer -- James Cameron http://quozl.linux.org.au/ ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
Re: [Server-devel] automount external HD
On Thu, 2010-10-14 at 00:24 -0700, Sameer Verma wrote: On Wed, Oct 13, 2010 at 11:19 PM, James Cameron qu...@laptop.org wrote: On Wed, Oct 13, 2010 at 10:15:55PM -0700, Sameer Verma wrote: I want to use an external USB hard drive and mount it as /library at boot time. I have added a line in /etc/fstab /dev/sda1 /libraryext3 defaults 0 0 Might you instead mount by UUID or LABEL? I will try this tomorrow. However, this won't mount at boot time. There's no auto in the fourth field. I changed that to auto but that does not work either. Here's the other interesting thing. The USB drive shows up under lsusb but is not auto mounted. df -h doesn't show it. mount -a results in a /dev/sda1 does not exist. Then if I unplug the USB cable and plug it back in, the drive gets recognized and automounts twice. Once at the /library mountpoint and once at the /mnt/usb0 mountpoint. Could be a conflict between fstab and udev? The package usbmount is reason for the behaviour you are seeing. http://dev.laptop.org/git/users/martin/usbmount.git/ Jerry ___ Server-devel mailing list Server-devel@lists.laptop.org http://lists.laptop.org/listinfo/server-devel
