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xen-users
Re: [Xen-users] UnionFS and initramfs
I am having problems with the initrd/initramfs. I am not really sure of
what needs to be done inside the init script for a VM. Since I have
never used a ramdisk with a VM. And I have never created an
initrd/initramfs before ( aside from using the generic
mkinitrd/mkinitfamfs ). Meaning I have no idea how to implement this in
the init script.
I have placed all needed partitions in the Xen config something like:
<lvm volume with VM image> as hda ro
<lvm volume to contain the changes> as hdb w
<lvm volume that contains swap> as hdc w
I am not near the machine with the exact Xen config, but I can post it
in about 12 hours.
Inside the init script, do I need to leave all of the script that is
generated by the mkinitrd/mkinitramfs?
I have tried just modifying the section of the script where it
configures the root file system. I mount hda, hdb in directories in the
initrd, and then mount the union of the two to another directory in the
initrd. I then try and make the union directory the root filesystem.
Then it all dies, with a kernel panic 'trying to kill init'. I can post
the script later today as well. I just don't know enough about init
scripts to begin tracing my error =\
Thanks for the reply!
Henning Sprang wrote:
> On 11/3/06, *Otter* <OtterzStuff@xxxxxxxxxxxxx
> <mailto:OtterzStuff@xxxxxxxxxxxxx>> wrote:
>
> Greetings,
>
> I would like to use unionfs for my Virtual Machines, and I would
> like to
> use initramfs instead of an initrd. But I am not sure how to
> accomplish
> this. I have read over the HOWTO section for Copy of Write, but
> haven't
> really found the solution I want. I do not know much about
> initramfs or
> initrd for that matter, but I do know initramfs is suppose to replace
> the initrd so I would like to use it. Ultimately what I want is to
> have
> a read only partition on LVM2 that contains the virtual machine image,
> and this would be readonly. Then I would have another partition that
> would be read write.
>
>
>
> Just configure two disks in the VM config file. They are available as
> partitions inside the domU then. Then, I guess the definition how they
> should be used to achieve you goal is some config in the initrd, right?
>
> I am familiar with unionfs, but not too much with
> Xen, so if any can provide assistance please do!
>
>
> Your question is very generic, and multiple questions at once.
> Better describe different problems in different mail (or, forgive me
> if I don't know enough abput initramfs and unionfs to understand they
> belong together).
>
> What did you try already, and what were your problems? What is "the
> solution you want" you didn't find in the HOWTO's?
>
> Henning
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
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