I'm trying to run Ubuntu inside an LXC container, and this inside a Chroot container with Ubuntu to have LXC userspace tools:
1. Copy an Ubuntu's debootstrap to an Android system (tried with Linux 3.0.15)
2. Chroot into it.
3. Run an LXC container inside.
I don't know if the lack of a LXC port to bionic component is the cause of my problem.
My procedure:
Create a debootstrap directory in a system running Ubuntu (v12.04 seems to host right LXC containers, not v12.10)
Code:
sudo debootstrap --verbose --arch=armhf --foreign precise precise-armhf
Copy the directory "precise-armhf" to an Ext partition in the Android/ARM device (rooted). Open a root session in the device:
(Supposing that the new path is /data/precise-armhf)
Check if there are ro/nodev/noexec/nosuid restrictions:
/dev/block/mmcblk0p12 /data ext4 ro,nosuid,nodev,noatime,barrier=1,journal_async_co mmit,data=ordered,noauto_da_alloc,discard 0 0
If necessary, remount the target with same options but removing rw/nodev/noexec/nosuid:
Code:
mount -o remount,rw,noatime,barrier=1,journal_async_commit,data=ordered,noauto_da_alloc,discard /data
Let's mount the common resources for a chroot:
Code:
RootPoint="/data/precise-armhf"
mount -o bind "/dev" "$RootPoint/dev"
mount -o bind "/dev/pts" "$RootPoint/dev/pts"
mount -o bind "/sys" "$RootPoint/sys"
mount -o bind "/proc" "$RootPoint/proc"
Find the cgroup independent resources in the Android host:
Code:
mount | sed -e "/ cgroup /!d"
none /acct cgroup rw,relatime,cpuacct 0 0
none /dev/cpuctl cgroup rw,relatime,cpu 0 0
Make them available to chroot environment:
Code:
mkdir -p "$RootPoint/acct"
mount -o bind /acct "$RootPoint/acct"
mount -o bind /dev/cpuctl "$RootPoint/dev/cpuctl"
Enter to the first container, mount anything specific, and one more directory to sure programs see something mounted:
Code:
chroot "$RootPoint" /bin/su
mount -a
if [ "$(mount)" = "" ] ; then mount -o bind /selinux /selinux ; fi
Complete debootstrap in the target architecture:
Code:
/debootstrap/debootstrap --second-stage
Patch to avoid Upstart errors:
Code:
dpkg-divert --local --rename --add /sbin/initctl
ln -s /bin/true /sbin/initctl
Configure network:
Code:
echo "nameserver 4.2.2.2" > /etc/resolv.conf
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
echo "nameserver 8.8.4.4" >> /etc/resolv.conf
echo "127.0.0.1 localhost" > /etc/hosts
Look for repositories already set, and/or set them:
Code:
cat /etc/apt/sources.list
echo "deb http://ports.ubuntu.com/ precise main universe" >> /etc/apt/sources.list
echo "# deb-src http://ports.ubuntu.com/ precise main universe" >> /etc/apt/sources.list
echo "" >> /etc/apt/sources.list
echo "deb http://ports.ubuntu.com/ precise-updates main universe" >> /etc/apt/sources.list
echo "# deb-src http://ports.ubuntu.com/ precise-updates main universe" >> /etc/apt/sources.list
echo "" >> /etc/apt/sources.list
echo "deb http://ports.ubuntu.com/ precise-security main universe" >> /etc/apt/sources.list
echo "# deb-src http://ports.ubuntu.com/ precise-security main universe" >> /etc/apt/sources.list
Update repositories, install LXC and create a new container:
Code:
apt-get update
apt-get install lxctl
lxc-create -t ubuntu --name quantal -- --release quantal
(some error messages):
Can not write log, openpty() failed (/dev/pts not mounted?)
invoke-rc.d: policy-rc.d denied execution of start.
The fact is that LXC container doesn't start:
Code:
lxc-start --name quantal
lxc-start: failed to create veth4lBZQS-vethe2nGyB : Operation not supported
lxc-start: failed to create netdev
lxc-start: failed to create the network
lxc-start: failed to spawn 'quantal'
lxc-start: No such file or directory - failed to remove cgroup '/acct//lxc/quantal'
(also tested with precise)
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