[mythtv-users] Best options/howto for diskless frontends

[Paul Gardiner]

On 26/02/2013 17:50, Raymond Wagner wrote:
> On 2/26/2013 11:43, Paul Gardiner wrote:
>> Now it's all working, I'm wondering how to use chroot. Since
>> I have the whole of / as a writable nfs share, I guess I can
>> do most things (like installing other packages in yast) by
>> just sshing in to the running frontend, but for building
>> mythtv I'd rather use the
>> fast processor on the backend than the ION frontend. I imagine
>> I can use chroot to do that, but I don't know what I'm
>> supposed to do to set up /dev /sys /proc, or if I need to.
>> Do I mount devtmpfs in the chroot's /dev? Not sure if I need
>> proc or sys just for a build.
>
> Consult the Gentoo manual install docs.
>
> http://www.gentoo.org/doc/en/gentoo-x86-quickinstall.xml#doc_chap2_sect8
>
> It should work fairly universally, regardless of what distro you are using.

Brilliant, thanks.

> The only concern I would have in doing what you describe is whether your
> build machine is actually a close enough match to your ION frontend. I
> have a single root disk image that gets periodically updated, cloned,
> and pushed out to several diskless frontends, including an i3, an AM2
> Athlon, and a 939 Athlon. If I update that image on the i3 using the
> standard '--enable-proc-opts', MythTV will get compiled with certain SSE
> extensions that the older Athlons do not support, and they will crash if
> I attempt playback. Cross-compiling is considerably more involved than
> simply chrooting into the other environment.

Ah I see. I hadn't realised that features were derived from proc - makes
perfect sense though. Is that just at the configure stage, or also at
the make stage?

Paul.