Missing hvc0 in Ubuntu Lucid Xen DomU

consolexen

I've just installed an Ubuntu Lucid 64bit image (from Stacklet) as a Xen DomU, running under Xen 3.2.1 on Centos 5.2 64bit.
Everything is working fine, except my logs are flooded with:

/dev/hvc0: No such file or directory

I tried creating the device with mknod /dev/hvc0 c 229 0 but the message just changes to:

/dev/hvc0: cannot open as standard input: No such device or address

Any hint on what I could try? 🙁

Best Answer

I asked at Stacklet and they told me that

The Xen kernel used with 10.04 does not require /dev/hvc0. I recommend the following:

remove /etc/init/hvc0.conf (or move it someplace else)

/boot/grub/menu.lst should reference tty1 instead of hvc0

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Nope, those are pretty much your options. But I think you're overstating the problems of option (3), because in general that's what backups are anyway -- you can't guarantee that the copies you make of any file in the filesystem would be comprehensible to any process that uses it (for instance, if you copy your MySQL data directory while MySQL is running, MySQL may not be able to read those files again on restore).

The only additional concern with option (3) over doing an in-domain backup is that the filesystem won't necessarily be in a fit state to be read; in my experience, that isn't something that happens much (especially when you're backing up in the wee hours), and can be mitigated with an fsck check before you backup. In-domain backups are still the best way to go, IMO.

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What is the result of 'uname -a' on the host machine? Do you have a Xen enabled kernel loaded (on the host)? It should be something like:

2.6.18-92.1.10.el5xen

With xen at the end. If you are booting with a normal kernel, install the xen package with 'yum install kernel-xen' and boot with this new kernel.

Best Answer

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