| Matthew Rosewarne on 16 May 2008 14:19:51 -0700 |
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On Friday 16 May 2008, JP Vossen wrote: > How do I hijack /etc/apt/sources.list if using the Ubuntu Alternate CD? > I ALT-F2'd but there's no apt/ in /etc/. I know it gives you a box to > specify a proxy, but I'm using a local approx and I don't think that > works like the proxy that box is expecting. (I didn't actually try it > though.) > > I'm goofing around in VMware to figure out how to do LVM (for snapshots) > on top of RAID1 software mirroring, and I don't want to keep downloading > all the stuff it wants over the WAN when I can cache it locally. The installer does not use APT to install the base system, but rather debootstrap. You can enter a mirror to use as a boot parameter. > As for RAID1 + LVM, this is what I came up with, any comments? > > Partition Method: manual > Create 256M /boot (label boot0) on first disk > Create 256M /boot1 (label boot1) on second disk > Use the rest of each disk for "physical volume for RAID" > Configure Software Raid > Yes, then "Create MD devices" > RAID1, then follow prompts > RAID1 device > Use all space as "physical volume for LVM" > Configure the LVM > Create volume group, name = hostname > Create logical volume > swap_1 512M > root rest of space - e.g., 2G > (to leave some space free for snapshots!) > LVM VG hostname, LV root > Mount as ext3 /root, label = root > LVM VG hostname, LV swap_1 > Use as swap area Do you mean "/root" or "/" ? I don't see a "/" partition here. > 256M for /boot is way overkill, but since it's non-LVM and disk is cheap... Keep a "live" image in there for rescue purposes, also useful for making changes to the root fs. > I'm still pretty sure you need to leave /boot out of the LVM and mirror, > can anyone prove me wrong? So if I do that, I also need to manually > keep /boot in sync on the 2 disks, later manually install grub on the > second disk, and if the first disk dies, I'd need to edit something in > the grub config while attempting to boot from the second disk. Correct? > Per above I'd label the second disk's /boot as boot1 so in theory if > grub is using labels, a tweak from ""boot" to "boot1" should do it? While I don't know if it's available on Ubuntu, GRUB2 *should* allow you to have "/" on LVM without a separate "/boot". Otherwise, make the two different boot partitions into another RAID1 device, but remember to install the MBR to _BOTH_ drives! > I see the Alternate CD also allows you to trivially set encryption. > Very cool. Can you use RAID1 + LVM + Encryption? Just wondering. Wow, > that's a lot of moving parts. Yes, you can. For a completely-encrypted disk, I would recommend setting that up with RAID1 first, encryption on top of the RAID1, and LVM on top of the encryption. Attachment:
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