public void start() throws Exception {
while (true) {
// find the vhost that cpu load is lower than the threshold
VHost underloadHost = getUnderloadVhost();
if (underloadHost != null) {
VHost targetVHost = null;
// find the target vhost that can consolidate the vms on this vhost
targetVHost = getTargetVHost(underloadHost, getAdjustment(underloadHost));
if (targetVHost != null) {
// migrate all the vms on this vhost to the target vhost
List<VM> vms = underloadHost.getVMs();
try {
for (VM vm : vms) vm.migrate(targetVHost);
} catch (Exception e) {
e.printStackTrace();
log.warn("migration failed, please go to check your vCenter.");
}
// shut down this vhost
powerOff(underloadHost);
}
}
try {
Thread.sleep(1000 * 3);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
private int getAdjustment(VHost host) throws Exception {
int adm = 0;
for (VM vm : host.getVMs()) {
adm += vm.cpuUsageMhz();
}
return adm;
}
private VHost getTargetVHost(VHost underloadVHostint, int adjustment) throws Exception {
List<VHost> vHosts = getPoweredOnHosts();
for (int i = 0; i < vHosts.size(); ++i) {
if (!underloadVHostint.getName().equals(vHosts.get(i).getName())) {
if (!isOverloadAfterMigrate(vHosts.get(i), adjustment)) {
return vHosts.get(i);
}
}
}
return null;
}
private boolean powerOff(VHost vhost) throws Exception {
return vhost.powerOff();
}
