Bug#567468: please set hostname via sysctl early on
Package: initramfs-tools
Version: 0.93.4
Severity: wishlist
mdadm in incremental mode needs the hostname to be able to work
without a configuration file, which would make RAID-boot much more
robust. Instead of mdadm touching
/proc/sys/kernel/{host,domain}name, it feels like initramfs should
do that.
The attached scripts take care of it. hostname is the hook, and
00hostname the script for init-top. It might make more sense to put
this into local-top though, I don't really know how it interacts
with netboot.
--
.''`. martin f. krafft madd...@d.o Related projects:
: :' : proud Debian developer http://debiansystem.info
`. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org
`- Debian - when you have better things to do than fixing systems
#!/bin/sh
#
# initramfs script to inform the kernel about the hostname early on
#
# Copyright © 2010 martin f. krafft madd...@debian.org
# Released under the terms of the Artistic Licence 2.0
#
set -eu
case ${1:-} in prereqs) exit 0;; esac
if [ -s /conf/hostname ]; then
. /scripts/functions
HOSTNAME=$(cat /conf/hostname)
log_begin_msg Setting hostname to $HOSTNAME
case $HOSTNAME in
*.*)
echo ${HOSTNAME#*.} /proc/sys/kernel/domainname
HOSTNAME=${HOSTNAME%%.*}
;;
esac
echo $HOSTNAME /proc/sys/kernel/hostname
log_end_msg
fi
exit
#!/bin/sh
#
# initramfs hook to store the hostname in the initrd
#
# Copyright © 2010 martin f. krafft madd...@debian.org
# Released under the terms of the Artistic Licence 2.0
#
set -eu
exec hostname --fqdn $DESTDIR/conf/hostname
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Bug#567468: please set hostname via sysctl early on
On Jan 29, martin f krafft madd...@debian.org wrote:
mdadm in incremental mode needs the hostname to be able to work
without a configuration file, which would make RAID-boot much more
robust. Instead of mdadm touching
/proc/sys/kernel/{host,domain}name, it feels like initramfs should
do that.
What happens if the hostname is changed but the initramfs is not
rebuilt?
--
ciao,
Marco
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Description: Digital signature
Bug#567468: please set hostname via sysctl early on
also sprach Marco d'Itri m...@linux.it [2010.01.30.0233 +1300]:
mdadm in incremental mode needs the hostname to be able to work
without a configuration file, which would make RAID-boot much
more robust. Instead of mdadm touching
/proc/sys/kernel/{host,domain}name, it feels like initramfs
should do that.
What happens if the hostname is changed but the initramfs is not
rebuilt?
How likely is that to happen? How likely is it to happen that the
hostname is changed, an array built (thus carrying the new
hostname), and the initramfs not rebuilt?
Yes, I see these problems, but I don't think they are so real that
they warrant guarding against them.
--
.''`. martin f. krafft madd...@d.o Related projects:
: :' : proud Debian developer http://debiansystem.info
`. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org
`- Debian - when you have better things to do than fixing systems
syntactic sugar causes cancer of the semicolon.
-- epigrams in programming
digital_signature_gpg.asc
Description: Digital signature (see http://martin-krafft.net/gpg/)
Bug#567468: please set hostname via sysctl early on
On Jan 29, martin f krafft madd...@debian.org wrote: What happens if the hostname is changed but the initramfs is not rebuilt? How likely is that to happen? How likely is it to happen that the hostname is changed, an array built (thus carrying the new hostname), and the initramfs not rebuilt? It looks likely to me when building a new system. -- ciao, Marco signature.asc Description: Digital signature
Bug#567468: please set hostname via sysctl early on
also sprach Marco d'Itri m...@linux.it [2010.01.30.0839 +1300]: What happens if the hostname is changed but the initramfs is not rebuilt? How likely is that to happen? How likely is it to happen that the hostname is changed, an array built (thus carrying the new hostname), and the initramfs not rebuilt? It looks likely to me when building a new system. Right, but if you muck around with the system at this level, I assume you can recover the system if it fails to bring up the RAID by itself using the initramfs console. Anyway, I don't really see a way to guard against the problems, nor a way to solve it otherwise, short of running update-initramfs from the hostname binary or grub trying to read /etc/hostname and passing it via kernel command line. I guess I could try this, but it sounds fragile and hard. -- .''`. martin f. krafft madd...@d.o Related projects: : :' : proud Debian developer http://debiansystem.info `. `'` http://people.debian.org/~madduckhttp://vcs-pkg.org `- Debian - when you have better things to do than fixing systems i wish i hadn't slept all day, it's really lowered my productivity -- robert mcqueen digital_signature_gpg.asc Description: Digital signature (see http://martin-krafft.net/gpg/)
