People,
Firstly, congratulations on some nice work! - I could not get inter-guest or host-guest networking on FC5 but it started working immediately on FC6 - thanks!
On a FC6 host I have created a FC6 guest minimal install (everything checked off except for text networking) in a 1.5GB image file. What is the format of this image? Is it possible to somehow use a loopback switch to mount it like iso9660? - I want to be able to make a copy of the image file; in the image, edit the /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth0 files; add an appropriate /etc/xen config file and then be able to boot a second guest. Is this possible somehow?
Thanks,
Phil.
Let's say that your image is called /var/lib/xen/images/disk.img
First you need to access that file like a loopback device
losetup -f /var/lib/xen/images/disk.img
that will create a device like /dev/loop0 If you run "losetup -a" you'll get a list of the loopback devices that are configured.
Lets presume that it was /dev/loop0 that was created.
You have a device now but you don't have partitions yet. You can do fdisk -l /dev/loop0 to see what partitions are in the loopback device but you can't access them yet.
You need to use kpartx to add the partition mappings.
kpartx -a /dev/loop0
This will add partition mappings under /dev/mapper.
You should now be able to access these like regular partitions. If you used LVM during your install then you'll need to do a vgscan and a vgchange -ay to activate the volume groups. Now you can mount the partitions/logical volumes.
At this point I hope you didn't use the default partitioning for both the guest and the host, otherwise you'll have duplicate VG names. There is a way to rename volume groups but that's a story for another day .....
On Tue, 2006-12-26 at 19:28 +1100, Phil Rhoades wrote:
People,
Firstly, congratulations on some nice work! - I could not get inter-guest or host-guest networking on FC5 but it started working immediately on FC6 - thanks!
On a FC6 host I have created a FC6 guest minimal install (everything checked off except for text networking) in a 1.5GB image file. What is the format of this image? Is it possible to somehow use a loopback switch to mount it like iso9660? - I want to be able to make a copy of the image file; in the image, edit the /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth0 files; add an appropriate /etc/xen config file and then be able to boot a second guest. Is this possible somehow?
Thanks,
Phil.
Andrew,
Thanks for the reply - see inline comments:
On Tue, 2006-12-26 at 08:23 -0500, Andrew Cathrow wrote:
Let's say that your image is called /var/lib/xen/images/disk.img
First you need to access that file like a loopback device
losetup -f /var/lib/xen/images/disk.img
that will create a device like /dev/loop0
OK, that seemed to work.
If you run "losetup -a" you'll get a list of the loopback devices that are configured.
I get:
/dev/loop0: [0344]:49158 (/home/fc6v1)
Lets presume that it was /dev/loop0 that was created.
Correct.
You have a device now but you don't have partitions yet. You can do fdisk -l /dev/loop0 to see what partitions are in the loopback device but you can't access them yet.
I get:
Disk /dev/loop0: 1610 MB, 1610612736 bytes 255 heads, 63 sectors/track, 195 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System /dev/loop0p1 * 1 195 1566306 83 Linux
You need to use kpartx to add the partition mappings.
kpartx -a /dev/loop0
This will add partition mappings under /dev/mapper.
I now have:
brw-rw---- 1 root disk 253, 0 Dec 27 04:32 loop0p1
You should now be able to access these like regular partitions. If you used LVM during your install then you'll need to do a vgscan and a vgchange -ay to activate the volume groups. Now you can mount the partitions/logical volumes.
Yes, when I do:
mount /dev/mapper/loop0p1 /mnt
I can then see all the directories under /mnt!
At this point I hope you didn't use the default partitioning for both the guest and the host, otherwise you'll have duplicate VG names.
No, I used one big 1.5GB partition - I avoid using LVM usually anyway.
Many thanks!
Now I just have to work out how to get a REALLY minimal guest install - a la The RULE Project or The FedoraCD project, although as an exercise I will probably reduce the RPMs in the current guest as much as possible myself to begin with.
Regards,
Phil.
There is a way to rename volume groups but that's a story for another day .....
On Tue, 2006-12-26 at 19:28 +1100, Phil Rhoades wrote:
People,
Firstly, congratulations on some nice work! - I could not get inter-guest or host-guest networking on FC5 but it started working immediately on FC6 - thanks!
On a FC6 host I have created a FC6 guest minimal install (everything checked off except for text networking) in a 1.5GB image file. What is the format of this image? Is it possible to somehow use a loopback switch to mount it like iso9660? - I want to be able to make a copy of the image file; in the image, edit the /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth0 files; add an appropriate /etc/xen config file and then be able to boot a second guest. Is this possible somehow?
Thanks,
Phil.
On Tue, Dec 26, 2006 at 07:28:04PM +1100, Phil Rhoades wrote:
People,
Firstly, congratulations on some nice work! - I could not get inter-guest or host-guest networking on FC5 but it started working immediately on FC6 - thanks!
On a FC6 host I have created a FC6 guest minimal install (everything checked off except for text networking) in a 1.5GB image file. What is the format of this image? Is it possible to somehow use a loopback switch to mount it like iso9660? - I want to be able to make a copy of the image file; in the image, edit the /etc/sysconfig/network and /etc/sysconfig/network-scripts/ifcfg-eth0 files; add an appropriate /etc/xen config file and then be able to boot a second guest. Is this possible somehow?
http://fedoraproject.org/wiki/FedoraXenQuickstartFC6#head-9c5408e750e8184aec...
Karel
-
Andrew Cathrow -
Karel Zak -
Philip Rhoades