Am 15.03.2011 03:25, schrieb David Kavanagh:
> Has anyone come up with a preferred method of messing with grub? I need to
> install a hypervisor (like xen or kvm) and modify the grub.conf to make the
> machine boot from the new kernel.
> I might mess with Augeas. What do the experts say?
We use Puppet to bring a short shell script to every machine which scans
for available kernels and writes a grub.conf to reflect these. This is
modelled after the Debian approach, albeit much simpler because some
parameters in grub.conf are known to the infrastructure and can thus
statically inserted by Puppet.
Our script for Gentoo looks like this (feel free to use and adapt):
---------------------------------------------------
#!/bin/bash
# Generate GRUB config from contents of /boot.
# Managed by Puppet: do not edit this file directly. It will be overwritten!
set -e
ROOT="<%= grub_root %>"
OPTS="root=<%= part_root %> dolvm console=ttyS1,57600 console=tty0"
# fail is there are no kernels found in /boot - it is probably not mounted
ls /boot/kernel* >/dev/null 2>&1
cat >/boot/grub/grub.conf <<__EOT__
default 0
fallback 1
timeout 5
title Gentoo GNU/Linux
root ${ROOT}
kernel /boot/kernel ${OPTS}
title Gentoo GNU/Linux (old)
root ${ROOT}
kernel /boot/kernel.old ${OPTS}
__EOT__
for kernel in /boot/kernel-genkernel-*; do
vers=${kernel#/boot/kernel-genkernel-}
cat >>/boot/grub/grub.conf <<__EOT__
title ${vers}
root ${ROOT}
kernel ${kernel} ${OPTS}
__EOT__
done
grub --batch </boot/grub/install.grub
---------------------------------------------------
Note the bare "ls" line. This causes failure in conjunction with the "-e"
shell flag if there are no kernels. The preferred kernel versions have
symlinks in the root directory and are included first. After that other
available kernel versions follow.
HTH
Christian
--
Dipl.-Inf. Christian Kauhaus <>< · k...@gocept.com · systems administration
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http://gocept.com · tel +49 345 1229889 11 · fax +49 345 1229889 1
Zope and Plone consulting and development
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