CLOUDSTACK-4436: in case of older kvm host, we'd better try serveral times to make sure we passed cmdline parameters to system vms

core/src/com/cloud/agent/resource/virtualnetwork/VirtualRoutingResource.java

@@ -1256,6 +1256,41 @@ public class VirtualRoutingResource implements Manager {
         return "Unable to connect";
     }
 
+    public boolean connect(final String ipAddress, int retry, int sleep) {
+        for (int i = 0; i <= retry; i++) {
+            SocketChannel sch = null;
+            try {
+                if (s_logger.isDebugEnabled()) {
+                    s_logger.debug("Trying to connect to " + ipAddress);
+                }
+                sch = SocketChannel.open();
+                sch.configureBlocking(true);
+
+                final InetSocketAddress addr = new InetSocketAddress(ipAddress, _port);
+                sch.connect(addr);
+                return true;
+            } catch (final IOException e) {
+                if (s_logger.isDebugEnabled()) {
+                    s_logger.debug("Could not connect to " + ipAddress);
+                }
+            } finally {
+                if (sch != null) {
+                    try {
+                        sch.close();
+                    } catch (final IOException e) {}
+                }
+            }
+            try {
+                Thread.sleep(sleep);
+            } catch (final InterruptedException e) {
+            }
+        }
+
+        s_logger.debug("Unable to logon to " + ipAddress);
+
+        return false;
+    }
+
 
     @Override
     public String getName() {

plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java

@@ -3551,15 +3551,18 @@ ServerResource {
             if (vmSpec.getType() != VirtualMachine.Type.User) {
                 if ((_kernelVersion < 2006034) && (conn.getVersion() < 1001000)) { // CLOUDSTACK-2823: try passCmdLine some times if kernel < 2.6.34 and qemu < 1.1.0 on hypervisor (for instance, CentOS 6.4)
                     //wait for 5 minutes at most
-                    for (int count = 0; count < 30; count ++) {
-                        boolean succeed = passCmdLine(vmName, vmSpec.getBootArgs());
-                        if (succeed) {
-                            break;
+                    String controlIp = null;
+                    for (NicTO nic : nics) {
+                        if (nic.getType() == TrafficType.Control) {
+                            controlIp = nic.getIp();
                         }
-                        try {
-                            Thread.sleep(5000);
-                        } catch (InterruptedException e) {
-                            s_logger.trace("Ignoring InterruptedException.", e);
+                    }
+                    for (int count = 0; count < 30; count ++) {
+                        passCmdLine(vmName, vmSpec.getBootArgs());
+                        //check router is up?
+                        boolean result = _virtRouterResource.connect(controlIp, 1, 5000);
+                        if (result) {
+                            break;
                         }
                     }
                 } else {