After installing the Ubuntu xen-server packages and rebooting the operating system using the Xen kernel the boot process appears to hang after displaying the "Setting system clock..." message.
This is a problem related to the ''hwclock '' binary which is common to a number of different Linux distributions in addition to Ubuntu. This problem can occur both when booting the host Xen system and when launching guest (domainU) systems.
One way to prevent this If the problem from is encountered when booting the host system with a Xen enabled kernel, boot the system with the standard (i.e. non-Xen) and run the following commands: <pre>sudo suupdate-rc.d -f hwclock.sh removeupdate-rc.d -f hwclockfirst.sh remove</pre> If the problem is occurring on an Ubuntu in a Xen domainU system , an option is to simply edit the following same two system initialization files. The first step is to mount the root filesystem of the guest using the loopback interface. For example, if the root filesystem resides on a disk image it may be mounted at /tmp/mnt as follows: <pre>mkdir /tmp/mntsudo mount -o loop UbuntuXen.img /tmp/mnt</pre> Alternatively, if the domainU root filesystem resides on a physical disk partition (in this example /dev/sdb1), the mount command might read as follows: <pre>mkdir /tmp/mntsudo mount -o loop /dev/sdb1 /tmp/mnt</pre> Once the domainU root filesystem is mounted, edit the following files:
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Once this change one of these sets of changes has been made to both the hwclockfirst.sh and hwclock.sh , files simply reboot unmount the system domainU root filesystem and the guest Ubuntu system should boot fully without hanging. [[Category:Virtualization Problem Solutions]]
