2011-06-13 18:35:42 +02:00
Provisioning Server ideas
- bootup kernel on target host via TFTP/PXE
- start our code that
- enables networking (dhcp)
- enables sshd
Requires:
- Program that creates our blob that needs to be started
- for Linux: initrd
- Including ssh keys -> known!
- startup sshd
2011-06-14 00:00:51 +02:00
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Setup for installation server:
- have dhcpd available
- install tftpd server
- configure dhcp to tell clients to boot from tftp server
- have a kernel
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Ideas on how to create "blob"
- Use tools from system?
-> requires same arch on destination!
- Use debian|...| base?
-> works with cuni!
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tftp via cuni:
debian pxelinux.0 pxelinux.cfg
[19:44] kr:tftp% ln -s /usr/lib/syslinux/
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How to create the initrd?
Base from ...
arch?
debian?
- needs many hardware support / in kernel?
- fit to kernel?
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Based on Debian
[21:33] kr:tftp% sudo debootstrap --arch=i386 squeeze debian-squeeze
sudo chroot debian-squeeze /bin/bash
apt-get install openssh-server
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Based on Archlinux
Edit / create pacman.conf
Server = ftp://mirrors.kernel.org/archlinux/$repo/os/i686
[21:40] kr:~% grep -v ^# pacman.conf | grep -v '^$'
[options]
HoldPkg = pacman glibc
SyncFirst = pacman
Architecture = auto
[core]
Include = Server = ftp://mirrors.kernel.org/archlinux/$repo/os/i686
[extra]
Include = Server = ftp://mirrors.kernel.org/archlinux/$repo/os/i686
[community]
Include = Server = ftp://mirrors.kernel.org/archlinux/$repo/os/i686
[archlinuxfr]
Server = http://repo.archlinux.fr/$arch
[21:40] kr:tftp% sudo mkarchroot -C ~/pacman.conf archlinuxroot
[21:42] kr:tftp% sudo mkarchroot -C ~/pacman.conf archlinuxroot base
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Initramfs general:
- need /init
Test in Debian:
root@kr:/# ln -s /sbin/init init
Create initramfs:
[22:47] kr:debian-squeeze% sudo find . -print0 | sudo cpio --null -ov --format=newc | gzip -9 > ../pre-os/initrd.gz
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Gentoo: http://en.gentoo-wiki.com/wiki/Initramfs
It is possible to specify multiple initramfs to be extracted during boot. This can be useful if you want to create a generic initramfs (for example one that does mdadm) and then add modifications in separate files (for example a custom /etc/mdadm.conf for every machine).
http://syslinux.zytor.com/wiki/index.php/SYSLINUX#INITRD_initrd_file
It supports multiple filenames separated by commas. This is mostly useful for initramfs, which can be composed of multiple separate cpio or cpio.gz archives. Note: all files except the last one are zero-padded to a 4K page boundary. This should not affect initramfs.
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Multiple initrds, #1:
LABEL preos
MENU LABEL Pre OS (Debian Squeeze)
KERNEL debian-squeeze/boot/vmlinuz-2.6.32-5-686
INITRD debian-squeeze/boot/initrd.img-2.6.32-5-686,pre-os/initrd.gz
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Debug in rootfs:
root@kr:/# passwd
Enter new UNIX password:
Retype new UNIX password:
passwd: password updated successfully
test
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Multiple nics in Debian...
