Bug#646137: live-boot-initramfs-tools: dhcp lease is not renewed when using netboot with nfsroot
I am using a debian live system which is started via netboot.
The root file system lives in a squashfs-file on a NFS share (as usual)
and the network adress is acquired via dhcp.
Here is my /proc/cmdline:
boot=live vga=791 live-config=hostname,openssh-server netboot=nfs nfsroot=192.168.0.250:/srv/nfs live-media-path=debian-live/$
When looking at the network traffic one can see that the DHCP lease is
never renewed. This means it might happen, that this address is given to
another client while my client still uses it.
The root of the problem lies in Bug #627166
"ipconfig: ignores dhcp options":
In the initramfs generated from /usr/share/initramfs-tools/hooks/live the
'ipconfig' tool is used to get an IP address via dhcp. As described in the bug
mentioned above ipconfig dos not report lease time, so this information is
not available. And no DHCP client is started later on.
Does NOT work: trying to force reallocation of the IP addrress via the "dhcp"
kernel comand line option does not work since then the network will disconnected
later in the boot sequence. -> not good with root on NFS :-)
Does work: I have just started 'dhclient' from the comand line when the system
is up. This spawns a dhclient deamon which properly renewes the lease as needed.
The network is not disconnected and everything is fine. I will try starting
dhclient from rc local later on, but don't see a reason why this should not work.
Since the information about which interface is started with dhcp is already made
available in the final root of the running system (/var/log/netboot.config and
/var/log/live.log) this information could be used to start a dhclient on this
interface later in the boot process. This still seems a bit like a hack since
the proper solution would imho require ipconfig to report the lease time, then
construct a proper /var/lib/dhcp/dhclient.leases file and only start dhclient
I also don't know what would be the best place to start the dhclient from.
Here is my /proc/cmdline:
boot=live vga=791 live-config=hostname,openssh-server netboot=nfs nfsroot=192.168.0.250:/srv/nfs live-media-path=debian-live/test01 initrd=debian-live/test01-x64.ird BOOT_IMAGE=debian-live/test01-x64.knl
-- System Information:
Debian Release: 6.0.2
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)
Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages live-boot-initramfs-tools depends on:
ii busybox 1:1.17.1-8 Tiny utilities for small and embed
ii initramfs-tools 0.98.8 tools for generating an initramfs
ii udev 164-3 /dev/ and hotplug management daemo
live-boot-initramfs-tools recommends no packages.
live-boot-initramfs-tools suggests no packages.
-- no debconf information