Android Container
Download kernel source code from Android X86to compile,kernel's config file is copied from Android X86.On this basis,you need following compiler options to surpport LXC's environment. (1) About Namespace
CONFIG_NAMESPACES
CONFIG_UTS_NS
CONFIG_IPC_NS
CONFIG_PID_NS
CONFIG_NET_NS
（2）About Cgroups
CONFIG_CGROUPS
CONFIG_CGROUP_NS
ONFIG_CGROUP_DEVICE
CONFIG_CGROUP_SCHED
CONFIG_CGROUP_CPUACCT
CONFIG_CPUSETS
（3）About MISC
CONFIG_VETH
CONFIG_MACWLAN
CONFIG_VLAN_8021Q
CONFIG_SECURITY_FILE_CAPABILITIES
（4）Other
CONFIG_POSIX_MQUEUE
LXC package has executable program and shell script. （1）Compile LXC
./configure --prefix=/system/local
make
make install
Note:/usr/local is default prefix of /configure ,and there is no /usr directory in android下,so you need to change it.
（2）Transplant Shell script
lxc's script is written in GNU Linux's bash.Many tools and commands is non-existent or non-executable.So you need modify as follow:
1. Statically link a bash procedure,and transpant to android
2. Copy ubuntu 10.04 file procedure to android
3. Copy zgrep script to android;zgrep calls ”gzip -cdfq”,and it can't use in Android,replace it to ”gzip -c -d -f”
4. lxc-create call command id -u from 190;this command can't execute in android,so you should comment revelant code out;lxc-destroy need do some modifications
（3）Modify source code
conf.c in LXC project calls tmpfile(),which didn't realize in Android's bionic libc.You need write tmpfile_replace(),whose function is same as tmpfile(),and conf.c can call tmpfile_replace()
（4）Compile LXC again
You need compile LXC again after modifying LXC source code; The main process includes following:
1. Modify LXC_PROJECT/src/lxc/Makefile.am,put new code files to Macro pkginclue_HEADERS and liblxc_so_SOURCES
2. Call autoconf to generate configure file(you need install autotools and libtools)
3. Call ./configure and make again
Busybox is a binary executable program,which integrates about 100 frequently-used Linux commands and tools.
Busybox is viewed as simplest Linux system,which contains all tools to create a complete Linux filesystem hierarchy standard,such as init,mount,mknod,and so on.So,if you can run a Busybox Container,you can also work on our Android LXC environment.
（1）Compile statically Busybox
You need compile statically a complete busybox to avoid dynamic Shared libraries' error when creating container's rootfs(lxc-create)
1. Download busybox source code from Busybox
2. make menuconfig, --> Build Options, --> Build Busybox as a static binary
3. make
4. Put compiled busybox to /system/local/bin directory beneath Host,and add PATH environment variable
adb push bin/busybox /system/local/bin/
export PATH=/system/local/bin:$PATH
(2) Create rootfs of Busybox
lxc-create -t busybox -n bb
(3) Modify config of Busybox
lxc.utsname = bb
lxc.tty = 1
lxc.pts = 1
lxc.rootfs = /system/local/var/lib/lxc/bb/rootfs
lxc.mount.entry = /lib /system/local/var/lib/lxc/bb/rootfs/lib none ro,bind 0 0
lxc.mount.entry = /lib /system/local/var/lib/lxc/bb/rootfs/usr/lib none ro,bind 0 0
(4) Mount cgroup file system
for t in `ls /system/cgroup`
do
mount -t cgroup -o $t cgroup /system/cgroup/$t
done
(5)Solve problem -- No such file or directory: /dev/shm (optional)
mkdir -p /dev/shm
mount -t tmpfs -o nodev,noexec tmpfs /dev/shm