Hi, There are also two scripts I'm using for the Android port that can be useful: http://bazaar.launchpad.net/~ubuntu-lxc/lxc/android-build-scripts/files
On Android (ramfs), I'd start a container by using that run-lxc wrapper which will then source prepare.sh which will in turn prepare a "fake" environment that we can pivot_root to. The trick is basically to create a new directory on a non-ramfs mount point, then bind-mount all the bits you need, then chroot to that directory and run LXC from it. On Sat, Dec 14, 2013 at 01:08:09PM +0000, Cal Leeming [Simplicity Media Ltd] wrote: > Seems there's a few discussions about ramfs and pivot [1], and apparently > it's unsupported [2]. > > As a workaround you could try to place overlayfs on top of your ramfs [3], > you'd then place both your lower and upper dir on ramfs - YMMV. > > Others may chime in with a different workaround, as I'm not sure if this > would be the best way. > > Hope this helps > > Cal > > [1] https://www.google.co.uk/search?q=pivot_root+tmpfs > [2] http://www.slax.org/blog/18438-initramfs-pivot-root-solution.html > [3] http://askubuntu.com/questions/109413/how-do-i-use-overlayfs > > > > > > On Sat, Dec 14, 2013 at 7:18 AM, Qiang Huang <[email protected]>wrote: > > > Hi guys, > > > > I was trying to run a container from ramfs, to root filesystem is > > rootfs(ramfs), the template is put onto a mounted disk whose fs is > > ext3, and I got this error(I'll skip my config and version and os > > and so on, I think they are not keys): > > ... > > lxc-start 1386999058.944 DEBUG lxc_conf - mountpoint for old rootfs is > > '/usr/local/lib/lxc/rootfs/lxc_putold' > > lxc-start 1386999058.944 ERROR lxc_conf - Invalid argument - pivot_root > > syscall failed > > lxc-start 1386999058.944 ERROR lxc_conf - failed to setup pivot root > > lxc-start 1386999058.944 ERROR lxc_conf - failed to set rootfs for > > 'hq91' > > lxc-start 1386999058.944 ERROR lxc_start - failed to setup the container > > lxc-start 1386999058.944 ERROR lxc_sync - invalid sequence number 1. > > expected 2 > > lxc-start 1386999058.952 ERROR lxc_start - failed to spawn 'hq91' > > > > I dug and figured out that pivot_root has some limitations with ramfs, > > So is it possible to run a container from ramfs? And how can we do that? > > > > Any comments are appreciated. > > > > > > > > _______________________________________________ > > lxc-users mailing list > > [email protected] > > http://lists.linuxcontainers.org/listinfo/lxc-users > > > _______________________________________________ > lxc-users mailing list > [email protected] > http://lists.linuxcontainers.org/listinfo/lxc-users -- Stéphane Graber Ubuntu developer http://www.ubuntu.com
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