Install x86-64 Linux.
Install and setup corosync.
If you use Debian Squeeze,
$ aptitude install corosync # or compile corosync.
$ sudo corosync # run corosync daemon as root
Download QEMU and Sheepdog codes.
$ git clone git://git.sv.gnu.org/qemu.git
$ git clone git://sheepdog.git.sf.net/gitroot/sheepdog/sheepdog
Build
$ cd qemu
$ ./configure
$ make install
$ cd ../sheepdog
$ ./autogen.sh
$ ./configure
$ make install
$ cd ..
Launch the sheepdog daemon on each machines of the cluster.
$ sheep /store_dir
Note
/store_dir is a directory to store objects. The directory must be on the filesystem with an xattr support. In case of ext3, you need to add ‘user_xattr’ to the mount options.
$ sudo mount -o remount,user_xattr /store_device
Format sheepdog cluster
$ collie cluster format --copies=3
–copies specifies the number of default data redundancy. In this case, the replicated data is stored on three machines.
Check cluster state
Following list shows that Sheepdog is running on 32 nodes.
$ collie node list
Idx Node id (FNV-1a) - Host:Port
------------------------------------------------
0 0308164db75cff7e - 10.68.13.15:7000
* 1 03104d8b4315c8e4 - 10.68.13.1:7000
2 0ab18c565bc14aea - 10.68.13.3:7000
3 0c0d27f0ac395f5d - 10.68.13.16:7000
4 127ee4802991f308 - 10.68.13.13:7000
5 135ff2beab2a9809 - 10.68.14.5:7000
6 17bd6240eab65870 - 10.68.14.4:7000
7 1cf35757cbf47d7b - 10.68.13.10:7000
8 1df9580b8960a992 - 10.68.13.11:7000
9 29307d3fa5a04f78 - 10.68.14.12:7000
10 29dcb3474e31d4f3 - 10.68.14.15:7000
11 29e089c98dd2a144 - 10.68.14.16:7000
12 2a118b7e2738f479 - 10.68.13.4:7000
13 3d6aea26ba79d75f - 10.68.13.6:7000
14 42f9444ead801767 - 10.68.14.11:7000
15 562c6f38283d09fe - 10.68.14.2:7000
16 5dd5e540cca1556a - 10.68.14.6:7000
17 6c12a5d10f10e291 - 10.68.14.13:7000
18 6dae1d955ca72d96 - 10.68.13.7:7000
19 711db0f5fa40b412 - 10.68.14.14:7000
20 7c6b95212ee7c085 - 10.68.14.9:7000
21 7d010c31bf11df73 - 10.68.13.2:7000
22 82c43e908b1f3f01 - 10.68.13.12:7000
23 931d2de0aaf61cf5 - 10.68.13.8:7000
24 961d9d391e6021e7 - 10.68.13.14:7000
25 9a3ef6fa1081026c - 10.68.13.9:7000
26 b0b3d300fed8bc26 - 10.68.14.10:7000
27 b0f08fb98c8f5edc - 10.68.14.8:7000
28 b9cc316dc5aba880 - 10.68.13.5:7000
29 d9eda1ec29c2eeeb - 10.68.14.7:7000
30 e53cebb2617c86fd - 10.68.14.1:7000
31 ea46913c4999ccdf - 10.68.14.3:7000
Create a 256 GB virtual machine image of Alice.
$ qemu-img create sheepdog:Alice 256G
You can also convert from existing KVM images to Sheepdog ones.
$ qemu-img convert ~/amd64.raw sheepdog:Bob
See Sheepdog images by the following command.
$ collie vdi list
name id size used shared creation time object id
--------------------------------------------------------------------
Bob 0 2.0 GB 1.6 GB 0.0 MB 2010-03-23 16:16 80000
Alice 0 256 GB 0.0 MB 0.0 MB 2010-03-23 16:16 40000
Boot the virtual machine.
$ qemu-system-x86_64 sheepdog:Alice
Following command checks used images.
$ collie vm list
Name |Vdi size |Allocated| Shared | Status
----------------+---------+---------+---------+------------
Bob | 2.0 GB| 1.6 GB| 0.0 MB| running on xx.xx.xx.xx
Alice | 256 GB| 0.0 MB| 0.0 MB| not running
Snapshot
$ qemu-img snapshot -c name sheepdog:Alice
-c flag is meaningless currently
After getting snapshot, a new virtual machine images are added as a not-current image.
$ collie vdi list
name id size used shared creation time object id
--------------------------------------------------------------------
Bob 0 2.0 GB 1.6 GB 0.0 MB 2010-03-23 16:16 80000
Alice 0 256 GB 0.0 MB 0.0 MB 2010-03-23 16:21 c0000
s Alice 1 256 GB 0.0 MB 0.0 MB 2010-03-23 16:16 40000
You can boot from the snapshot image by specifying snapshot id
$ qemu-system-x86_64 sheepdog:Alice:1
Create a Charlie’s image as a clone of Alice’s image.
$ qemu-img create -b sheepdog:Alice:1 sheepdog:Charlie
Charlie’s image is added to the virtual machine list.
$ collie vdi list
name id size used shared creation time object id
--------------------------------------------------------------------
Bob 0 2.0 GB 1.6 GB 0.0 MB 2010-03-23 16:16 80000
Alice 0 256 GB 0.0 MB 0.0 MB 2010-03-23 16:21 c0000
s Alice 1 256 GB 0.0 MB 0.0 MB 2010-03-23 16:16 40000
Charlie 0 256 GB 0.0 MB 0.0 MB 2010-03-23 16:23 100000
Run the shutdown command on the one of the cluster machines.
$ collie cluster shutdown
Note