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livemedia-creator: Add documentation on using mock and livemedia-creator

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As of anaconda version 22.15 you can run livemedia-creator and anaconda
inside a mock chroot to create iso and filesystem images.
This commit is contained in:
Brian C. Lane 2015-01-20 11:19:29 -08:00
parent c231c2a63f
commit 3d01cd9129
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README.livemedia-creator
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@ -272,6 +272,78 @@ for installations of Atomic Host. Example kickstart for such an installation
using Atomic installer iso with local repo included in the image can be found
in docs/rhel-atomic-pxe-live.ks.
USING MOCK TO CREATE IMAGES
---------------------------
As of lorax version 22.2 you can use livemedia-creator and anaconda version
22.15 inside of a mock chroot with --make-iso and --make-fsimage. Note that
this requires bind mounting the host's /dev/ directory into the mock, which
could be dangerous since it includes the host's drives. You can work around
this by /dev/loopX nodes before running livemedia-creator. This example does
not do that.
On the host system:
1. yum install -y mock
2. Add a user to the mock group to use for running mock. eg. builder
3. Edit the /etc/mock/site-defaults.cfg file to change:
config_opts['internal_dev_setup'] = False
The loop devices are needed for the installation, so it needs to mount the
host's /dev/ inside the mock.
This is fairly dangerous. I would recommend using a dedicated build host and
making sure you have backups just in case something goes wrong and it
modifies the host system. You can avoid this if you setup the /dev/loopX
device nodes yourself.
4. Create a new /etc/mock/ config file based on the rawhide one, or modify the
existing one so that the following options are setup:
config_opts['chroot_setup_cmd'] = 'install @buildsys-build anaconda-tui lorax'
# NOTE that this actually needs to be set in site-defaults.cfg
config_opts['internal_dev_setup'] = False
# Mount the relevant host paths inside the mock /dev/
config_opts['plugin_conf']['bind_mount_enable'] = True
config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/dev','/dev/'))
config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/dev/pts','/dev/pts/'))
config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/dev/shm','/dev/shm/'))
# build results go into /home/builder/results/
config_opts['plugin_conf']['bind_mount_opts']['dirs'].append(('/home/builder/results','/results/'))
The following steps are run as the builder user who is a member of the mock
group.
5. Make a directory for results matching the bind mount above
mkdir ~/results/
6. Copy the example kickstarts
cp /usr/share/docs/lorax/*ks .
7. Make sure tar and dracut-network are in the %packages section and that the
url points to the correct repo
8. Init the mock
mock -r fedora-rawhide-x86_64 --init
9. Copy the kickstart inside the mock
mock -r fedora-rawhide-x86_64 --copyin ./fedora-minimal.ks /root/
10. Make a minimal iso:
mock -r fedora-rawhide-x86_64 --chroot -- livemedia-creator --no-virt \
--resultdir=/results/try-1 --logfile=/results/logs/try-1/try-1.log \
--make-iso --ks /root/fedora-minimal.ks
Results will be in ./results/try-1 and logs under /results/logs/try-1/
including anaconda logs and livemedia-creator logs. The new iso will be
located at ~/results/try-1/images/boot.iso, and the ~/results/try-1/
directory tree will also contain the vmlinuz, initrd, etc.
DEBUGGING PROBLEMS
------------------