6:30 a.m.
[Please let's keep the replies on the list.]
On Fri, Dec 11, 2015 at 11:58:46AM +0000, Scott Gorton wrote:
>ISOs are not modifiable by the Linux kernel :-( So none of the
tools like guestfish,
>virt-customize etc etc can work on them.
I wasn't suggesting that virt-builder or any virt-* command attempt
to manipulate the ISO. Instead, I was wondering if I should create
the ISO with a different filesystem layout. Mine appears to be an
installer image that lays out the filesystem upon first install.
Yours seems to be a fully baked (live-cd) format.
Maybe the way to go would be to configure a VM using virsh and point
it at my ISO. I'll then run through the boot/installation process
(to install packages and run our customization scripts), shut the
system down to produce a qcow2. I can then use your other tools to
convert the qcow2 into other formats.
In that case I don't understand the problem, but I'll just comment
that virt-customize cannot customize an install CD.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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11:02 a.m.
New subject: Which ISO format/layout does virt-builder expect?
Perhaps an example will clarify. Let's say that I want to create a virt-builder
repository image for CentOS-6.5-x86_64-bin-DVA1.iso image that I downloaded off of a
CentOS mirror.
1) First, let's mount the ISO to see what's inside
# mkdir /mnt/centos-6.5
# mount -o loop CentOS-6.5-x86_64-bin-DVD1.iso /mnt/centos-6.5
# cd /mnt/centos-6.5
# ls -l
-r--r--r-- 2 root root 14 Nov 29 2013 CentOS_BuildTag
dr-xr-xr-x 3 root root 2048 Nov 29 2013 EFI
-r--r--r-- 2 root root 212 Nov 27 2013 EULA
-r--r--r-- 2 root root 18009 Nov 27 2013 GPL
dr-xr-xr-x 3 root root 2048 Nov 29 2013 images
dr-xr-xr-x 2 root root 2048 Nov 29 2013 isolinux
dr-xr-xr-x 2 root root 655360 Nov 29 2013 Packages
-r--r--r-- 2 root root 1354 Nov 27 2013 RELEASE-NOTES-en-US.html
dr-xr-xr-x 2 root root 4096 Nov 29 2013 repodata
-r--r--r-- 2 root root 1706 Nov 27 2013 RPM-GPG-KEY-CentOS-6
-r--r--r-- 2 root root 1730 Nov 27 2013 RPM-GPG-KEY-CentOS-Debug-6
-r--r--r-- 2 root root 1730 Nov 27 2013 RPM-GPG-KEY-CentOS-Security-6
-r--r--r-- 2 root root 1734 Nov 27 2013 RPM-GPG-KEY-CentOS-Testing-6
-r--r--r-- 1 root root 3380 Nov 29 2013 TRANS.TBL
(Note: it's an install image like the one I've been trying to use)
2) Now following your instructions
(https://rwmj.wordpress.com/2014/09/11/creating-a-local-virt-builder-repos...)
I'll move the iso to my ~/builder directory, compress it and add an entry in my index
file.
# // unmount the iso and move to builder directory
# umount /mnt/centos-6.5
# mv CentOS-6.5-x86_64-bin-DVD1.iso builder
# cd builder
# // get the original size of the iso
# ls -l CentOS-6.5-x86_64-bin-DVD1.iso
-rwxr--r-- 1 root root 4467982336 Dec 11 11:04 CentOS-6.5-x86_64-bin-DVD1.iso
# // compress it using prescribed settings
# xz --best --block-size=16777216 CentOS-6.5-x86_64-bin-DVD1.iso
# // get the size of the compressed image
# ls -l
-rwxr--r-- 1 root root 4287626520 Dec 11 11:04 CentOS-6.5-x86_64-bin-DVD1.iso.xz
# // create a sha512 checksum
# sha512sum CentOS-6.5-x86_64-bin-DVD1.iso.xz
ea57956dc36afc497e2508d8e5bda983b87c11007301d1d11936281ed3eb5fdff46fe125df8941df56a5f22866218d18fd426017a7adf032d90defc8e20b2ace
CentOS-6.5-x86_64-bin-DVD1.iso.xz
# // update the index file (steps omitted)
# // show the contents of the index file
# cat index
[centos-6.5]
name=centos-6.5
arch=x86_64
file=CentOS-6.5-x86_64-bin-DVD1.iso.xz
checksum[sha512]=ea57956dc36afc497e2508d8e5bda983b87c11007301d1d11936281ed3eb5fdff46fe125df8941df56a5f22866218d18fd426017a7adf032d90defc8e20b2ace
format=raw
size=4467982336
compressed_size=4287626520
expand=/dev/sda3
notes=CentOS-6.5
# // see if virt-builder lists the new image
# virt-builder --list|grep centos
gpg: Signature made Sat 05 Dec 2015 06:41:14 PM EST using RSA key ID E1B768A0
gpg: Good signature from "Richard W.M. Jones <rjones(a)redhat.com>"
gpg: aka "Richard W.M. Jones <rich(a)annexia.org>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: F777 4FB1 AD07 4A7E 8C87 67EA 9173 8F73 E1B7 68A0
centos-6.5 x86_64 centos-6.5
centos-6 x86_64 CentOS 6.6
centos-7.0 x86_64 CentOS 7.0
centos-7.1 x86_64 CentOS 7.1
3) Notice that centos-6.5 appears in list. Let's try and create a 6.5 image
# virt-builder --password-crypto sha512 centos-6.5
gpg: Signature made Sat 05 Dec 2015 06:41:14 PM EST using RSA key ID E1B768A0
gpg: Good signature from "Richard W.M. Jones <rjones(a)redhat.com>"
gpg: aka "Richard W.M. Jones <rich(a)annexia.org>"
gpg: WARNING: This key is not certified with a trusted signature!
gpg: There is no indication that the signature belongs to the owner.
Primary key fingerprint: F777 4FB1 AD07 4A7E 8C87 67EA 9173 8F73 E1B7 68A0
[ 6.0] Downloading: file:///root/builder/CentOS-6.5-x86_64-bin-DVD1.iso.xz
[ 19.0] Planning how to build this image
[ 19.0] Uncompressing
[ 23.0] Opening the new disk
[ 25.0] Setting a random seed
virt-builder: warning: random seed could not be set for this type of guest
[ 25.0] Setting passwords
virt-builder: error: libguestfs error: mktemp: /etc/shadow.guestfstcTloo:
No such file or directory
If reporting bugs, run virt-builder with debugging enabled and include the
complete output:
virt-builder -v -x [...]
Notice the " error: libguestfs error: mktemp: /etc/shadow.guestfstcTloo" error.
The issue is that virt-builder expects the ISO image to contain an /etc directory. This
image does not. It's a stock CentOS-6.5 installer image downloaded from CentOS.
So the question is what do I have to do to create an ISO image that virt-builder can use?
The images that are present in the virt-builder libguestfs.conf file (fetching from
http://libguestfs.org/download/builder/index.asc), how are THOSE images built?
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Scott Gorton