Gentoo template creation
This page is about making a template cache for OpenVZ VE from Gentoo linux. The method is basically the same as described in article Slackware template creation.
Contents
Downloading stage3
We shall make the template from stage3 file. OpenVZ OS template should be an archive of root of the working system, but without the kernel and some files. You can download stage3 from the nearest mirror here: http://www.gentoo.org/main/en/mirrors.xml.
Create directory for the new VPS and unarchive stage3 there:
mkdir /vz/private/777 tar -xjf /root/stage3-i686-2006.0.tar.bz2 -C /vz/private/777
Creating VE config
Now you need to create the configuration file for the VE, 777.conf:
vzctl set 777 --applyconfig vps.basic --save
Editing config
Add to the /etc/vz/conf/777.conf:
DISTRIBUTION="gentoo" OSTEMPLATE="gentoo"
Make /etc/mtab a symlink to /proc/mounts.
ln -s /proc/mounts /vz/private/777/etc/mtab
Editing /etc/fstab
echo "proc /proc proc defaults 0 0" > /vz/private/777/etc/fstab
We need only /proc to mounted at the boot time.
Editing inittab
Edit /etc/inittab, put a hashmark (#) before the lines containing:
c?:1235:respawn:/sbin/agetty 38400 tty? linux
This prevents from starting getty and login.
Editing /etc/shadow
Edit /vz/private/777/etc/shadow, change root's password in the first line to an exclamation mark (!):
root:!:10071:0:::::
This will disable the root login until the password changed with vzctl set 777 --userpasswd root:password.
Editing /etc/init.d/checkroot
We have to clean this script and make them dummy, because we don't need mount or check root.
cat > /etc/init.d/checkroot
#!/sbin/runscript
depend()
{
}
start()
{
}
end()
{
}
Editing /sbin/rc
Comment line number 141:
try mount -n ${mntcmd:--t sysfs sysfs /sys}
This prevents from attepting to mount /sys.
Setting up udev
Delete /lib/udev-state/devices.tar.bz2 and create some device nodes needed to enter VPS:
rm /lib/udev-state/devices.tar.bz2 mknod /lib/udev/devices/ttyp0 c 3 0 mknod /lib/udev/devices/ptyp0 c 2 0 mknod /lib/udev/devices/ptmx c 5 2
Testing
vzctl start 777 vzctl enter 777
You can check running services.
rc-status -a
All services in boot and default runlevels must be started. If everything all right, stop it
vzctl stop 777
Making distfiles и portage of the host system available in VPS.
To install software into VPS with portage you should mount /usr/portage into VPS with "bind" option. Do this after VPS starts:
mkdir /vz/root/777/usr/portage mount -o bind /usr/portage /vz/root/777/usr/portage
If your /usr/portage/distfiles placed on the other partition do:
mount -o bind /usr/portage/distfiles /vz/root/777/usr/portage/distfiles
Now, to install package into VPS you just need enter there by chroot or vzctl enter and
emerge package_name
while you have all needed files in the /usr/portage/distfiles of host system.
For security reasons hold this directories mounted only while you are installing software into VPS.
Creating the cache file
cd /vz/private/777/ tar czf /vz/template/cache/gentoo.tar.gz *
Testing the new cache file
vzctl create 800 --ostemplate gentoo --ipadd 192.168.0.10 --hostname testvps
If created successfully, try to start it:
vzctl start 800
If it started, and you can ssh in, congratulations, you've got a working Gentoo template!