BtrPlace is an open source VM manager that can be specialized on demand by third party developers to integrate new placement constraints. BtrPlace has already been used successfully to address high-availability, security but also energy-efficiency concerns. It has been developped since 2006 in the Mines de Nantes then with the University of Nice-Sophia Antipolis. It is now a part of the OpenCloudware project that aims at building an open platform for the development and the deployment of distributed application on clouds.

1. BTRPLACE
Facing SLA expectations in a cloud
Fabien Hermenier Jean-Marc Menaud
fabien.hermenier@unice.fr menaud@mines-nantes.fr
OW2Con @ Orange labs 27-29 nov. 2012

2. HOSTING PLATFORMS
Sysadmins are looking for:
•manageability
•security
•efficient resource usage
•...
OW2Con @ Orange labs 27-29 nov. 2012

3. HOSTING PLATFORMS
Sysadmins are looking for:
•manageability
•security
•efficient resource usage
•...
OW2Con @ Orange labs 27-29 nov. 2012

4. VIRTUAL APPLIANCE
Clients are looking for:
•performance
•reliability
•isolation
•...
OW2Con @ Orange labs 27-29 nov. 2012

5. PLACEMENT CONSTRAINTS
VM-host affinity Dedicated instances MaxVMsPerServer
(DRS 4.1) (EC2) (DRS 5.1)
apr. 2011 mar. 2012 sep. 2012
An unachieved story in which you are not the hero
•closed-source algorithms
•not extensible algorithms by design
OW2Con @ Orange labs 27-29 nov. 2012

6. PLACEMENT CONSTRAINTS
• you have peculiar expectations
• you should be able to tune your placement algorithms
• make your needs our researches
OW2Con @ Orange labs 27-29 nov. 2012

7. BTRPLACE
From a Entropy built-in to standalone
VM placement algorithm
✓flexibility ✓composability
OW2Con @ Orange labs 27-29 nov. 2012

8. BTRPLACE
Placement constraints:
fault tolerance splitAmong, spread isolation split, lonely,
quarantine infrastructure management cumulatedCapacity,
fence, root, ban, singleCapacity, online, offline, running,
sleeping, terminate, among performance cpuMargin ,gather,
preserve, oversubscription energy management maxOnline,
noIdlesOnline, minSpareResources, maxSpareResources, ...
Optimization objectives:
«fast reconfigurations», «load balancing», «low
energy consumption», «low gas emissions», ...
OW2Con @ Orange labs 27-29 nov. 2012

9. THEY TRUST BTRPLACE
Btrcloud OW2 Sirocco-vmm
OW2Con @ Orange labs 27-29 nov. 2012

10. BTRPLACE
• an extensible, composable VM placement algorithm
• a part of the OW2 - Entropy
• open source
• a research project since 2006
• 10 publications, 2 awards
• academic and industrial partners
• contacts: fabien.hermenier@unice.fr
menaud@mines-nantes.fr
Try it: http://btrp.inria.fr/sandbox
OW2Con @ Orange labs 27-29 nov. 2012

11. PROGRAMMING PLACEMENT CONSTRAINTS
express the placement you want :
//LazySpread: future running VMS must run on distinct nodes
List<IntDomainVar> runnings = new ArrayList<IntDomainVar>();
for (VirtualMachine vm : getAllVirtualMachines()) {
if (core.getFutureRunnings().contains(vm)) {
Slice t = core.getAssociatedAction(vm).getDemandingSlice();
if (t != null) {runnings.add(t.hoster());}
}
}
core.post(new BoundAllDiff(runnings.toArray(), true));
let Constraint Programming solve that for you !
OW2Con @ Orange labs 27-29 nov. 2012