On Sun, 2012-10-28 at 18:52 +0100, Serge Hallyn wrote: > Quoting Michael H. Warfield (m...@wittsend.com): > > On Sat, 2012-10-27 at 13:51 -0400, Michael H. Warfield wrote: > > > On Sat, 2012-10-27 at 13:40 -0400, Michael H. Warfield wrote: > > > > /me erasing everything at this point and taking off the systemd crew, > > > > since this will have no relevance to them... > > > > > > > > Testing the hook feature out using git rev (finally got it built)... > > > > > > > > I added this line to my config... > > > > > > > > lxc.mount.entry=tmpfs /srv/lxc/private/Plover/dev.tmp tmpfs defaults 0 0 > > > > lxc.hook.mount = /var/lib/lxc/Plover/mount > > > > > > > > In /var/lib/lxc/Plover/mount I have this: > > > > > > > > -- > > > > rsync -avAH /srv/lxc/private/Plover/dev.template/. > > > > /srv/lxc/private/Plover/dev.tmp/ > > > > -- > > > > > > > (This is just testing out the concepts. > > > > > > > If I understand this correctly, lxc.hook.pre-mount runs BEFORE the > > > > mounting takes place and lxc.hook.mount takes place after the mount. > > > > > > > Problem is, the result of that rsync is not showing up in the mounted > > > > tmpfs file system but is showing up in the underlying parent file system > > > > as if it were run pre-mount. Something not right here... > > > > > I changed it to "lxc.hook.start = /srv/lxc/mount" (where I put the > > > script in the container) which then works but that then requires the > > > template and the command to be in the container. Suboptimal to say the > > > least. But it gives me a way to test this tmpfs thing out. > > > > > I also noticed that the .start hook runs, it appears, after caps are > > > dropped and I see a lot of bitching about mknod on certain devices. I > > > had to thrown an exit 0 into that script so it would continue in spite > > > of the errors but, now, I can refine my template based on what it could > > > create. > > > > Crap. I've got a catch-22 here... This is going to take some work.
> Hey, > I've got a rather minimal patch (appended below) to add the support for > mounting and populating a minimal /dev working. (A few hours were wasted > due to my not knowing that upstart was going to issue mounted-dev even though > /dev was mounted before upstart started - and the mounted-dev hook deletes > and recreates all consoles. GAH) > > Yes, we can create the /dev directory with tmpfs from a template. > > Problem is that /dev/pts does not exist at the time we need to mount the > > devpts on /dev/pts for the pty's so that hurls chunks and dies. We > > can't create the /dev/ directory contents prior to mounting in the > > pre-mount hook because we won't have tmpfs in place at the time. We > > have to get tmpfs mounted on /dev and then create /dev/pts and then > > mount the ptys in there. There has to be a mkdir in between those two > > mount actions. Simplest solution would seem to be to add some logic to > > the mount logic that says "test if directory exists and, if not, create > > it." I'm not sure of the consequences of that, though. > > > > I don't see a way to make this happen with hooks. It's almost like we > > need and on-mount per mount hook. > Should be moot given my patch, which I intend to push this week, but why > couldn't a lxc.hook.mount do the whole thing, mount /dev and and populate > it? I wasn't thinking a lxc.hook.start, for the reasons you encountered, > but I assume you tried lxc.hook.mount and it failed? See my other comment about lxc.hook.mount. I tried using it to populate /dev but it showed up in the parent of the mount undeneath the tmpfs mount. It was like it ran pre-mount. I tried it for several different combinations and couldn't get it to go. Would still have the problem with mounting /dev/pts which would take place before the mount hook at run to mount the file system and populate it. That actually MIGHT work (gotta think on this now) if I used lxc.hook.pre-mount and mounted tmpfs over /dev, and populated it but then I run into a problem where I was using a bind-mount for the rootfs. Might still work. I'll test your patch out first though. > Patch below: <snip> Regards, Mike -- Michael H. Warfield (AI4NB) | (770) 985-6132 | m...@wittsend.com /\/\|=mhw=|\/\/ | (678) 463-0932 | http://www.wittsend.com/mhw/ NIC whois: MHW9 | An optimist believes we live in the best of all PGP Key: 0x674627FF | possible worlds. A pessimist is sure of it!
signature.asc
Description: This is a digitally signed message part
------------------------------------------------------------------------------ WINDOWS 8 is here. Millions of people. Your app in 30 days. Visit The Windows 8 Center at Sourceforge for all your go to resources. http://windows8center.sourceforge.net/ join-generation-app-and-make-money-coding-fast/
_______________________________________________ Lxc-devel mailing list Lxc-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lxc-devel
