StatelessLinux/PrepareImage
From FedoraProject
Stateless Linux - Preparing An Image
Once you have prepared a base image, you need to modify it so that it can be used by stateless clients.
One thing to bear in mind is that the same image should be usable on a client using NFS root, NFS loop root, cached root or, indeed, by a standalone system or a Xen guest.
The basic things you must do are:
- Switch on readonly-root:
$> echo "READONLY=yes" > /etc/sysconfig/readonly-root
This ensures that the init scripts do not remount the root filesystem read-write and various directories (see /etc/rwtab) are made writable using tmpfs mounts.
- Remove the
/and/bootentries from/etc/fstab
- Disable firstboot:
$> echo "RUN_FIRSTBOOT=no" > nfs/etc/sysconfig/firstboot
You should also:
- Check the network interface is configured to use DHCP:
$> cat > /etc/sysconfig/networking-scripts/ifcfg-eth0 << EOF DEVICE=eth0 ONBOOT=yes BOOTPROTO=dhcp EOF
- Configure the firewall
FIXME: details
- Ensure
/etc/mtabexists or the attempt to mount atmpfson/var/lib/stateless/writablewill fail trying to lock/etc/mtab
FIXME: this seems bogus; we should be able to survive this
- Run all the default cronjobs
FIXME: why? what does this fix?
- Remove unwanted files
FIXME: what leaves all these lying around? Can we fix them to not be left around?
-
/etc/group-and/etc/passwd-: temporary files -
/etc/resolv.conf: client's will get the nameservers using DHCP -
/tmp/.mozilla: what's this? -
/var/lib/rpm/__db.*: stale RPM locks
Notes:
- With your NIC configured to use DHCP, you need
mkinitrd >= 5.0.47-1in order for the lease obtained by the initrd to be passed to thedhclientthat gets run later
