Android Container 系列：大概步骤

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Compile Kernel (support cgroups & namespaces)

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

Transplant LXC tools to Android Host

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

Run Busybox container

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

Run Android JellyBean container

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