server: check server capacity when start/deploy a vm (#5339)

Author: weizhouapache

server/src/main/java/com/cloud/vm/UserVmManagerImpl.java

@@ -4853,9 +4853,19 @@ public Pair<UserVmVO, Map<VirtualMachineProfile.Param, Object>> startVirtualMach
         boolean deployOnGivenHost = false;
         if (destinationHost != null) {
             s_logger.debug("Destination Host to deploy the VM is specified, specifying a deployment plan to deploy the VM");
-            plan = new DataCenterDeployment(vm.getDataCenterId(), destinationHost.getPodId(), destinationHost.getClusterId(), destinationHost.getId(), null, null);
-            if (!AllowDeployVmIfGivenHostFails.value()) {
-                deployOnGivenHost = true;
+            final ServiceOfferingVO offering = _offeringDao.findById(vm.getId(), vm.getServiceOfferingId());
+            Pair<Boolean, Boolean> cpuCapabilityAndCapacity = _capacityMgr.checkIfHostHasCpuCapabilityAndCapacity(destinationHost, offering, false);
+            if (!cpuCapabilityAndCapacity.first() || !cpuCapabilityAndCapacity.second()) {
+                String errorMsg = "Cannot deploy the VM to specified host " + hostId + "; host has cpu capability? " + cpuCapabilityAndCapacity.first() + ", host has capacity? " + cpuCapabilityAndCapacity.second();
+                s_logger.info(errorMsg);
+                if (!AllowDeployVmIfGivenHostFails.value()) {
+                    throw new InvalidParameterValueException(errorMsg);
+                };
+            } else {
+                plan = new DataCenterDeployment(vm.getDataCenterId(), destinationHost.getPodId(), destinationHost.getClusterId(), destinationHost.getId(), null, null);
+                if (!AllowDeployVmIfGivenHostFails.value()) {
+                    deployOnGivenHost = true;
+                }
             }
         } else if (destinationCluster != null) {
             s_logger.debug("Destination Cluster to deploy the VM is specified, specifying a deployment plan to deploy the VM");