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  • Eine komplette Virtualisierungslandschaft auf dem eigenen Laptop – So geht’s

    - by Manuel Hossfeld
    Eine komplette Virtualisierungslandschaftauf dem eigenen Laptop – So geht’s Wenn man sich mit dem Virtualisierungsprodukt Oracle VM in der aktuellen Version 3.x näher befassen möchte, bietet es sich natürlich an, eine eigene Umgebung zu Lern- und Testzwecken zu installieren. Doch leichter gesagt als getan: Bei näherer Betrachtung der Architektur wird man schnell feststellen, dass mehrere Rechner benötigt werden, um überhaupt alle Komponenten abbilden zu können: Zum einen gilt es, den oder die OVM Server selbst zu installieren. Das ist recht leicht und schnell erledigt, aber da Oracle VM ein „Typ 1 Hypervisor ist“ - also direkt auf dem Rechner („bare metal“) installiert wird – ist der eigenen Arbeits-PC oder Laptop dafür recht ungeeignet. (Eine Dual-Boot Umgebung wäre zwar denkbar, aber recht unpraktisch.) Zum anderen wird auch ein Rechner benötigt, auf dem der OVM Manager installiert wird. Im Gegensatz zum OVM Server erfolgt dessen Installation nicht „bare metal“, sondern auf einem bestehenden Oracle Linux. Aber was tun, wenn man gerade keinen Linux-Server griffbereit hat und auch keine extra Hardware dafür opfern will? Möchte man alle Funktionen von Oracle VM austesten, so sollte man zusätzlich über einen Shared Storag everüfugen. Dieser kann wahlweise über NFS oder über ein SAN (per iSCSI oder FibreChannel) angebunden werden. Zwar braucht man zum Testen nicht zwingend entsprechende „echte“ Storage-Hardware, aber auch die „Simulation“ entsprechender Komponenten erfordert zusätzliche Hardware mit entsprechendem freien Plattenplatz.(Alternativ können auch fertige „Software Storage Appliances“ wie z.B. OpenFiler oder FreeNAS verwendet werden). Angenommen, es stehen tatsächlich keine „echte“ Server- und Storage Hardware zur Verfügung, so benötigt man für die oben genannten drei Punkte  drei bzw. vier Rechner (PCs, Laptops...) - je nachdem ob man einen oder zwei OVM Server starten möchte. Erfreulicherweise geht es aber auch mit deutlich weniger Aufwand: Wie bereits kurz im Blogpost anlässlich des letzten OVM-Releases 3.1.1 beschrieben, ist die aktuelle Version in der Lage, selbst vollständig innerhalb von VirtualBox als Gast zu laufen. Wer bei dieser „doppelten Virtualisierung“ nun an das Prinzip der russischen Matroschka-Puppen denkt, liegt genau richtig. Oracle VM VirtualBox stellt dabei gewissermaßen die äußere Hülle dar – und da es sich bei VirtualBox im Gegensatz zu Oracle VM Server um einen „Typ 2 Hypervisor“ handelt, funktioniert dieser Ansatz auch auf einem „normalen“ Arbeits-PC bzw. Laptop, ohne dessen eigentliche Betriebsystem komplett zu überschreiben. Doch das beste dabei ist: Die Installation der jeweiligen VirtualBox VMs muss man nicht selber durchführen. Der OVM Manager als auch der OVM Server stehen bereits als vorgefertigte „VirtualBox Appliances“ im Oracle Technology Network zum Download zur Verfügung und müssen im Grunde nur noch importiert und konfiguriert werden. Das folgende Schaubild verdeutlicht das Prinzip: Die dunkelgrünen Bereiche stellen jeweils Instanzen der eben erwähnten VirtualBox Appliances für OVM Server und OVM Manager dar. (Hier im Bild sind zwei OVM Server zu sehen, als Minimum würde natürlich auch einer genügen. Dann können aber viele Features wie z.B. OVM HA nicht ausprobieren werden.) Als cleveren Trick zur Einsparung einer weiteren VM für Storage-Zwecke hat Wim Coekaerts (Senior Vice President of Linux and Virtualization Engineering bei Oracle), der „Erbauer“ der VirtualBox Appliances, die OVM Manager Appliance bereits so vorbereitet, dass diese gleichzeitig als NFS-Share (oder ggf. sogar als iSCSI Target) dienen kann. Dies beschreibt er auch kurz auf seinem Blog. Die hellgrünen Ovale stellen die VMs dar, welche dann innerhalb einer der virtualisierten OVM Server laufen können. Aufgrund der Tatsache, dass durch diese „doppelte Virtualisierung“ die Fähigkeit zur Hardware-Virtualisierung verloren geht, können diese „Nutz-VMs“ demzufolge nur paravirtualisiert sein (PVM). Die hier in blau eingezeichneten Netzwerk-Schnittstellen sind virtuelle Interfaces, welche beliebig innerhalb von VirtualBox eingerichtet werden können. Wer die verschiedenen Netzwerk-Rollen innerhalb von Oracle VM im Detail ausprobieren will, kann hier natürlich auch mehr als zwei dieser Interfaces konfigurieren. Die Vorteile dieser Lösung für Test- und Demozwecke liegen auf der Hand: Mit lediglich einem PC bzw. Laptop auf dem VirtualBox installiert ist, können alle oben genannten Komponenten installiert und genutzt werden – genügend RAM vorausgesetzt. Als Minimum darf hier 8GB gelten. Soll auf der „Host-Umgebung“ (also dem PC auf dem VirtualBox läuft) nebenbei noch gearbeiten werden und/oder mehrere „Nutz-VMs“ in dieser simulierten OVM-Server-Umgebung laufen, empfehlen sich natürlich eher 16GB oder mehr. Da die nötigen Schritte zum Installieren und initialen Konfigurieren der Umgebung ausführlich in einem entsprechenden Paper beschrieben sind, möchte ich im Rest dieses Artikels noch einige zusätzliche Tipps und Details erwähnen, welche einem das Leben etwas leichter machen können: Um möglichst entstpannt und mit zusätzlichen „Sicherheitsnetz“ an die Konfiguration der Umgebung herangehen zu können, empfiehlt es sich, ausgiebigen Gebrauch von der in VirtualBox eingebauten Funktionalität der VM Snapshots zu machen. Dies ermöglicht nicht nur ein Zurücksetzen falls einmal etwas schiefgehen sollte, sondern auch ein beliebiges Wiederholen von bereits absolvierten Teilschritten (z.B. um eine andere Idee oder Variante der Umgebung auszuprobieren). Sowohl bei den gerade erwähnten Snapshots als auch bei den VMs selbst sollte man aussagekräftige Namen verwenden. So ist sichergestellt, dass man nicht durcheinander kommt und auch nach ein paar Wochen noch weiß, welche Umgebung man da eigentlich vor sich hat. Dies beinhaltet auch die genaue Versions- und Buildnr. des jeweiligen OVM-Releases. (Siehe dazu auch folgenden Screenshot.) Weitere Informationen und Details zum aktuellen Zustand sowie Zweck der jeweiligen VMs kann in dem oft übersehenen Beschreibungsfeld hinterlegt werden. Es empfiehlt sich, bereits VOR der Installation einen Notizzettel (oder eine Textdatei) mit den geplanten IP-Adressen und Namen für die VMs zu erstellen. (Nicht vergessen: Auch der Server Pool benötigt eine eigene IP.) Dabei sollte man auch nochmal die tatsächlichen Netzwerke der zu verwendenden Virtualbox-Interfaces prüfen und notieren. Achtung: Es gibt im Rahmen der Installation einige Passworte, die vom Nutzer gesetzt werden können – und solche, die zunächst fest eingestellt sind. Zu letzterem gehört das Passwort für den ovs-agent sowie den root-User auf den OVM Servern, welche beide per Default „ovsroot“ lauten. (Alle weiteren Passwort-Informationen sind in dem „Read me first“ Dokument zu finden, welches auf dem Desktop der OVM Manager VM liegt.) Aufpassen muss man ggf. auch in der initialen „Interview-Phase“ welche die VirtualBox VMs durchlaufen, nachdem sie das erste mal gebootet werden. Zu diesem Zeitpunkt ist nämlich auf jeden Fall noch die amerikanische Tastaturbelegung aktiv, so dass man z.B. besser kein „y“ und „z“ in seinem selbst gewählten Passwort verwendet. Aufgrund der Tatsache, dass wie oben erwähnt der OVM Manager auch gleichzeitig den Shared Storage bereitstellt, sollte darauf geachtet werden, dass dessen VM vor den OVM Server VMs gestartet wird. (Andernfalls „findet“ der dem OVM Server Pool zugrundeliegende Cluster sein sog. „Server Pool File System“ nicht.)

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  • Disaster, or Migration?

    - by Rob Farley
    This post is in two parts – technical and personal. And I should point out that it’s prompted in part by this month’s T-SQL Tuesday, hosted by Allen Kinsel. First, the technical: I’ve had a few conversations with people recently about migration – moving a SQL Server database from one box to another (sometimes, but not primarily, involving an upgrade). One question that tends to come up is that of downtime. Obviously there will be some period of time between the old server being available and the new one. The way that most people seem to think of migration is this: Build a new server. Stop people from using the old server. Take a backup of the old server Restore it on the new server. Reconfigure the client applications (or alternatively, configure the new server to use the same address as the old) Make the new server online. There are other things involved, such as testing, of course. But this is essentially the process that people tell me they’re planning to follow. The bit that I want to look at today (as you’ve probably guessed from my title) is the “backup and restore” section. If a SQL database is using the Simple Recovery Model, then the only restore option is the last database backup. This backup could be full or differential. The transaction log never gets backed up in the Simple Recovery Model. Instead, it truncates regularly to stay small. One that’s using the Full Recovery Model (or Bulk-Logged) won’t truncate its log – the log must be backed up regularly. This provides the benefit of having a lot more option available for restores. It’s a requirement for most systems of High Availability, because if you’re making sure that a spare box is up-and-running, ready to take over, then you have to be interested in the logs that are happening on the current box, rather than truncating them all the time. A High Availability system such as Mirroring, Replication or Log Shipping will initialise the spare machine by restoring a full database backup (and maybe a differential backup if available), and then any subsequent log backups. Once the secondary copy is close, transactions can be applied to keep the two in sync. The main aspect of any High Availability system is to have a redundant system that is ready to take over. So the similarity for migration should be obvious. If you need to move a database from one box to another, then introducing a High Availability mechanism can help. By turning on the Full Recovery Model and then taking a backup (so that the now-interesting logs have some context), logs start being kept, and are therefore available for getting the new box ready (even if it’s an upgraded version). When the migration is ready to occur, a failover can be done, letting the new server take over the responsibility of the old, just as if a disaster had happened. Except that this is a planned failover, not a disaster at all. There’s a fine line between a disaster and a migration. Failovers can be useful in patching, upgrading, maintenance, and more. Hopefully, even an unexpected disaster can be seen as just another failover, and there can be an opportunity there – perhaps to get some work done on the principal server to increase robustness. And if I’ve just set up a High Availability system for even the simplest of databases, it’s not necessarily a bad thing. :) So now the personal: It’s been an interesting time recently... June has been somewhat odd. A court case with which I was involved got resolved (through mediation). I can’t go into details, but my lawyers tell me that I’m allowed to say how I feel about it. The answer is ‘lousy’. I don’t regret pursuing it as long as I did – but in the end I had to make a decision regarding the commerciality of letting it continue, and I’m going to look forward to the days when the kind of money I spent on my lawyers is small change. Mind you, if I had a similar situation with an employer, I’d do the same again, but that doesn’t really stop me feeling frustrated about it. The following day I had to fly to country Victoria to see my grandmother, who wasn’t expected to last the weekend. She’s still around a week later as I write this, but her 92-year-old body has basically given up on her. She’s been a Christian all her life, and is looking forward to eternity. We’ll all miss her though, and it’s hard to see my family grieving. Then on Tuesday, I was driving back to the airport with my family to come home, when something really bizarre happened. We were travelling down the freeway, just pulled out to go past a truck (farm-truck sized, not a semi-trailer), when a car-sized mass of metal fell off it. It was something like an industrial air-conditioner, but from where I was sitting, it was just a mass of spinning metal, like something out of a movie (one friend described it as “holidays by Michael Bay”). Somehow, and I’m really don’t know how, the part of it nearest us bounced high enough to clear the car, and there wasn’t even a scratch. We pulled over the check, and I was just thanking God that we’d changed lanes when we had, and that we remained unharmed. I had all kinds of thoughts about what could’ve happened if we’d had something that size land on the windscreen... All this has drilled home that while I feel that I haven’t provided as well for the family as I could’ve done (like by pursuing an expensive legal case), I shouldn’t even consider that I have proper control over things. I get to live life, and make decisions based on what I feel is right at the time. But I’m not going to get everything right, and there will be things that feel like disasters, some which could’ve been in my control and some which are very much beyond my control. The case feels like something I could’ve pursued differently, a disaster that could’ve been avoided in some way. Gran dying is lousy of course. An accident on the freeway would have been awful. I need to recognise that the worst disasters are ones that I can’t affect, and that I need to look at things in context – perhaps seeing everything that happens as a migration instead. Life is never the same from one day to the next. Every event has a before and an after – sometimes it’s clearly positive, sometimes it’s not. I remember good events in my life (such as my wedding), and bad (such as the loss of my father when I was ten, or the back injury I had eight years ago). I’m not suggesting that I know how to view everything from the “God works all things for good” perspective, but I am trying to look at last week as a migration of sorts. Those things are behind me now, and the future is in God’s hands. Hopefully I’ve learned things, and will be able to live accordingly. I’ve come through this time now, and even though I’ll miss Gran, I’ll see her again one day, and the future is bright.

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  • Exception with Subsonic 2.2, SQLite and Migrations

    - by Holger Amann
    Hi, I'm playing with Migrations and created a simple migration like public class Migration001 : Migration { public override void Up() { TableSchema.Table testTable = CreateTableWithKey("TestTable"); } public override void Down() { } } after executing sonic.exe migrate I'm getting the following output: Setting ConfigPath: 'App.config' Building configuration from c:\tmp\MigrationTest\MigrationTest\App.config Adding connection to SQLiteProvider Found 1 migration files Current DB Version is 0 Migrating to 001_Init (1) There was an error running migration (001_Init): SQLite error near "IDENTITY": syntax error Stack Trace: at System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] argum ents, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] argume nts, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwn er) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke Attr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisib ilityChecks) at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invoke Attr, Binder binder, Object[] parameters, CultureInfo culture) at SubSonic.CodeRunner.RunAndExecute(ICodeLanguage lang, String sourceCode, S tring methodName, Object[] parameters) in D:\@SubSonic\SubSonic\SubSonic.Migrati ons\CodeRunner.cs:line 95 at SubSonic.Migrations.Migrator.ExecuteMigrationCode(String migrationFile) in D:\@SubSonic\SubSonic\SubSonic.Migrations\Migrator.cs:line 177 at SubSonic.Migrations.Migrator.Migrate() in D:\@SubSonic\SubSonic\SubSonic.M igrations\Migrator.cs:line 141 Any hints?

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  • Why Look and feel is not getting updated properly?

    - by swift
    I’m developing a swing application in which I have an option to change the Look and feel of the application on click of a button. Now my problem is when I click the button to change the theme it’s not properly updating the L&F of my app, say my previous theme is “noire” and I choose “MCWin” after it, but the style of the noire theme is still there Here is sample working code: package whiteboard; import java.awt.GridBagLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ComponentEvent; import java.awt.event.ComponentListener; import javax.swing.JFrame; import javax.swing.JLayeredPane; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.SwingUtilities; import javax.swing.UIManager; import javax.swing.WindowConstants; public class DiscussionBoard extends JFrame implements ComponentListener,ActionListener { // Variables declaration private JMenuItem audioMenuItem; private JMenuItem boardMenuItem; private JMenuItem exitMenuItem; private JMenuItem clientsMenuItem; private JMenuItem acryl; private JMenuItem hifi; private JMenuItem aero; private JMenuItem aluminium; private JMenuItem bernstein; private JMenuItem fast; private JMenuItem graphite; private JMenuItem luna; private JMenuItem mcwin; private JMenuItem noire; private JMenuItem smart; private JMenuBar boardMenuBar; private JMenuItem messengerMenuItem; private JMenu openMenu; private JMenu saveMenu; private JMenu themesMenu; private JMenuItem saveMessengerMenuItem; private JMenuItem saveWhiteboardMenuItem; private JMenu userMenu; JLayeredPane layerpane; /** Creates new form discussionBoard * @param connection */ public DiscussionBoard() { initComponents(); setLocationRelativeTo(null); addComponentListener(this); } private void initComponents() { boardMenuBar = new JMenuBar(); openMenu = new JMenu(); themesMenu = new JMenu(); messengerMenuItem = new JMenuItem(); boardMenuItem = new JMenuItem(); audioMenuItem = new JMenuItem(); saveMenu = new JMenu(); saveMessengerMenuItem = new JMenuItem(); saveWhiteboardMenuItem = new JMenuItem(); userMenu = new JMenu(); clientsMenuItem = new JMenuItem(); exitMenuItem = new JMenuItem(); setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); setLayout(new GridBagLayout()); setResizable(false); setTitle("Discussion Board"); openMenu.setText("Open"); saveMenu.setText("Save"); themesMenu.setText("Themes"); acryl = new JMenuItem("Acryl"); hifi = new JMenuItem("HiFi"); aero = new JMenuItem("Aero"); aluminium = new JMenuItem("Aluminium"); bernstein = new JMenuItem("Bernstein"); fast = new JMenuItem("Fast"); graphite = new JMenuItem("Graphite"); luna = new JMenuItem("Luna"); mcwin = new JMenuItem("MCwin"); noire = new JMenuItem("Noire"); smart = new JMenuItem("Smart"); hifi.addActionListener(this); acryl.addActionListener(this); aero.addActionListener(this); aluminium.addActionListener(this); bernstein.addActionListener(this); fast.addActionListener(this); graphite.addActionListener(this); luna.addActionListener(this); mcwin.addActionListener(this); noire.addActionListener(this); smart.addActionListener(this); messengerMenuItem.setText("Messenger"); openMenu.add(messengerMenuItem); openMenu.add(boardMenuItem); audioMenuItem.setText("Audio Messenger"); openMenu.add(audioMenuItem); exitMenuItem.setText("Exit"); exitMenuItem.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent evt) { exitMenuItemActionPerformed(evt); } }); openMenu.add(exitMenuItem); boardMenuBar.add(openMenu); saveMessengerMenuItem.setText("Messenger"); saveMenu.add(saveMessengerMenuItem); saveWhiteboardMenuItem.setText("Whiteboard"); saveMenu.add(saveWhiteboardMenuItem); boardMenuBar.add(saveMenu); userMenu.setText("Users"); clientsMenuItem.setText("Current Session"); userMenu.add(clientsMenuItem); themesMenu.add(acryl); themesMenu.add(hifi); themesMenu.add(aero); themesMenu.add(aluminium); themesMenu.add(bernstein); themesMenu.add(fast); themesMenu.add(graphite); themesMenu.add(luna); themesMenu.add(mcwin); themesMenu.add(noire); themesMenu.add(smart); boardMenuBar.add(userMenu); boardMenuBar.add(themesMenu); saveMessengerMenuItem.setEnabled(false); saveWhiteboardMenuItem.setEnabled(false); setJMenuBar(boardMenuBar); setSize(1024, 740); setVisible(true); } protected void exitMenuItemActionPerformed(ActionEvent evt) { System.exit(0); } @Override public void componentHidden(ComponentEvent arg0) { } @Override public void componentMoved(ComponentEvent e) { } @Override public void componentResized(ComponentEvent arg0) { } @Override public void componentShown(ComponentEvent arg0) { } @Override public void actionPerformed(ActionEvent e) { try { if(e.getSource()==hifi) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.hifi.HiFiLookAndFeel"); enableTheme(); hifi.setEnabled(false); } else if(e.getSource()==acryl) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); enableTheme(); acryl.setEnabled(false); } else if(e.getSource()==aero) { UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel"); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aero.AeroLookAndFeel"); enableTheme(); aero.setEnabled(false); } else if(e.getSource()==aluminium) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.aluminium.AluminiumLookAndFeel"); enableTheme(); aluminium.setEnabled(false); } else if(e.getSource()==bernstein) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.bernstein.BernsteinLookAndFeel"); enableTheme(); bernstein.setEnabled(false); } else if(e.getSource()==fast) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.fast.FastLookAndFeel"); enableTheme(); fast.setEnabled(false); } else if(e.getSource()==graphite) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.graphite.GraphiteLookAndFeel"); enableTheme(); graphite.setEnabled(false); } else if(e.getSource()==luna) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.luna.LunaLookAndFeel"); enableTheme(); luna.setEnabled(false); } else if(e.getSource()==mcwin) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.mcwin.McWinLookAndFeel"); enableTheme(); mcwin.setEnabled(false); } else if(e.getSource()==noire) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.noire.NoireLookAndFeel"); enableTheme(); noire.setEnabled(false); } else if(e.getSource()==smart) { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); SwingUtilities.updateComponentTreeUI(getRootPane()); UIManager.setLookAndFeel("com.jtattoo.plaf.smart.SmartLookAndFeel"); enableTheme(); smart.setEnabled(false); } SwingUtilities.updateComponentTreeUI(getRootPane()); } catch (Exception ex) { ex.printStackTrace(); } } private void enableTheme() { acryl.setEnabled(true); hifi.setEnabled(true); aero.setEnabled(true); aluminium.setEnabled(true); bernstein.setEnabled(true); fast.setEnabled(true); graphite.setEnabled(true); luna.setEnabled(true); mcwin.setEnabled(true); noire.setEnabled(true); smart.setEnabled(true); } public static void main(String []ar) { try { UIManager.setLookAndFeel("com.jtattoo.plaf.acryl.AcrylLookAndFeel"); } catch (Exception e) { e.printStackTrace(); } new DiscussionBoard(); } } What’s the problem here? why its not getting updated? There is a demo application here which is exactly doing what i want but i cant get a clear idea of it.

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  • Can I flash a PCI-E device's Firmware in a VM if the VM has exclusive IOMMU access?

    - by RibaldEddie
    I have a PCI-E Dell Perc 6/i RAID card that I'd like to flash with the latest firmware. Apparently I need either a Redhat / Centos OS or Windows in order to flash the firmware, but I have a VMWare 5.0.1 ESX hypervisor installed on the box and a CentOS guest OS. My motherboard support IOMMU and I have successfully used VMWare's PCI Passthrough feature to give VMs exclusive access to a PCI-E device. Is it safe to flash the firmware of a PCI-E device if that device is passed through to a single VM using the passthrough feature of VMware? Or should I boot one of the supported OSes directly on the bare metal?

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  • What is the difference betweeen "Network install" and "Network Boot" options in virt-manager when installing a new virtual machine

    - by Marwan
    From my understanding of PXE (Preboot Execution Environment), I know that there must be some negotiation first between the booting client and a DHCP server to obtain network parameters (IP address, etc) in order for the client to be able to fetch the boot loader and kernel image from the boot server. In other words, and aside from being a "virtual" machine, we're talking here about a "bare metal" machine, so there must be some "pre boot" mechanism for those negotiations to take place, and this is exactly what PXE is all about. When I think about the "Network install" option, I can't figure out how the new VM would be able to fetch the boot images (bootloader and kernel) without the previously mentioned mechanism. So, here is a short version of the question: When provisioning a new virtul machine, how do you expect the "Network install" option in virt-manager to work behind the scenes? Many thanks.

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  • Suggest methods for testing changes to "pam.d/common-*" files

    - by Jamie
    How do I test the changes to the pam.d configuration files: Do I need to restart the PAM service to test the changes? Should I go through every service listed in the /etc/pam.d/ directory? I'm about to make changes to the pam.d/common-* files in an effort to put an Ubuntu box into an active directory controlled network. I'm just learning what to do, so I'm preparing the configuration in a VM, which I plan to deploy in metal in the coming week. It is a clean install of Ubuntu 10.04 Beta 2 server, so other than SSH daemon, all other services are stock.

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  • How to convert an image to a .dwg file

    - by erikric
    My girlfriend is making an art project where she is having an image printed and cut out on a metal plate. The firm responsible for doing this is demanding a .dwg file (and something called polyline; some sort of setting maybe?). Neither of us have heard about this file format, and I find the information about it quite confusing. Most pages seem to link to some schetchy "FooToBarConverter" software, that I frankly don't trust. Could someone please enlighten us on what we need to do, or point to some safe and preferably free software that could do this? (An explanation of the dwg format and the polyline thing would also be much appreciated)

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  • Does static damage computer speakers?

    - by incarna
    I recently got a new pair of Klipsch Promedia 2.1's for my laptop. I unplug my laptop a lot to take it around but today the audio plug touched my plug for my monitor and a bit of static came out of the speakers. I've heard some rumors that static can damage speakers but I've never investigated this problem myself since I previously used a desktop and never unplugged them. The volume was at a normal volume- am I just being paranoid? Or could having the speaker port touching other bits of metal damage my speakers?

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  • One bigger Virtual Machine in Cloud

    - by flyer
    I just setup virtual machines on one hardware with Vagrant (this is just a test environment, not production!). I want to use a Puppet to configure them and next try to setup OpenStack. I am not sure If I am understanding how this should look at the end. Is it possible to have below architecture with OpenStack after all where I will run one Virtual Machine with e.g. 12 cores? ------------------------------- | VM (12c) | ------------------------------- | NOVA | NOVA | NOVA | ------------------------------- | OpenStack | ------------------------------- | VM (4c) | VM (4c) | VM (4c) | ------------------------------- | Bare Metal (8c) | ------------------------------- I need this information to have a bigger picture to continue.

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  • How to Shrink large Hyper-V VM

    - by autrevo
    Using Disk2VHD utility I converted my bare-metal OS into Hyper-V VHD - http://technet.microsoft.com/en-us/sysinternals/ee656415.aspx And I could obtain a huge 190GB VHD file. Apart from performance issues, this VHD worked fine as guest when hosted on Windows Server 200 R2, Hyper-V. Having realized need to keeping only system files and application installations on VHD. I have deleted most of the junk data from this VHD and now it contains only 20-25 GB. But I am not able to shrink the VHD VM. Having done some research, I came to know, this as a limitation of .VHD files. Subsequently I followed these two step using Edit Virtual Hard Wizard on Windows 2012 Box. Convert from VHD to VHDX (took close to 3 hrs.) Compact (Another 4 hrs.) This did not ever shrink the VHDX either. Does Hyper-V does not provide proper support to handle large VHDs or VHDXs whose size are the range of 200GB.

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  • Worst SysAdmin Accident

    - by Ward
    In line with the question about Best sysadmin accident, what's the worst accident you've been involved in? Unlike the previous question, I mean "worst" in the sense of most system damage or actual harm to people. I'll start with mine: We have two remote wiring closets that are at the end of a 100-foot corridor which has a metal grate for the floor. After we had Cat6 cable installed, the contractors cleaned up all the debris that dropped through the grating to the concrete 3 feet below. A co-worker and I entered the corridor to check on the progress one day but were distracted and didn't notice that a piece of grating had been moved aside. My buddy stepped into air and his chest slammed into the steel crossbar. He was winded and sore enough to take a couple days off, but luckily the steel beam had rounded edges and the size of the opening was such that he didn't smack his head into it or the floor below. Obviously we learned that areas where the floor is partially removed need to be flagged.

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  • Electricity in VAIO laptop ports while plugged in

    - by SRbH
    I have VAIO E series (SVE) laptop. While charger plugged in, touching VGA/HDMI/USB port metal casing gives me burning sensation. So, i checked it with voltmeter and i found that while plugged in there is presences of DC +1.0 V. Same case with my friend's VAIO E Series (VPCEH). Service center says this is normal. But i do not believe them as it is not the case with Dell Inspiron. Please let me know if you are facing same problem with VAIO and is it hazardous to devices which i connect to these ports (like HDD, LED, etc)?

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  • Realtek HD Audio playing weird with certain video formats

    - by dyasny
    Hi, I have a Gigabyte motherboard with an onboard Realtek HD sound card. The card is working perfectly everywhere, except for a single video format, where the voice is distorted, sounds as if it's been passed through a metal tube. Been googling for this, but couldn't find an answer anywhere. The movie plays fine on other systems (got Linux everywhere else), but on this one (winXP-x64-sp2) it just doesn't. Here are some details: MPC: Type: KLCP WMV File Audio: 0x000a 22050Hz mono 20Kbps [Raw Audio 0] Video: Windows Media Video 9 400x300 29.97fps 227Kbps [Raw Video 1] VLC: Codec: wmas Sample rate: 22050 Bits per sample: 16 Bitrate: 20kb/s

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  • Bacula vs. BackupPC [closed]

    - by ujjain
    I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc... Update: I see this ranks high in Google, I found a good article: http://www.serverfocus.org/backuppc-vs-bacula-vs-amanda. I personally think that BackupPC is good for smaller environment, but Bacula, despite the high learning curve, is better for environments that requilre scaling.

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  • What are the limitations of virtual machines?

    - by j-g-faustus
    I'm considering setting up a virtual machine running Windows, with Ubuntu 10.10 as the host OS, for those cases where I have a Windows-only program. I understand that using a VM will lose some performance, but are there other limitations to what the OS in a virtual machine can do compared to "running on bare metal"? For example: Can a VM play games, like Dragon Age Origins or Civilization V? (Possibly with poorer framerates and/or lower resolution, but does it play at all?) Can a VM rip DVD/Blue-ray using AnyDVD or similar Windows program? Can a VM handle new hardware that requires dedicated drivers, but the drivers are only available for the OS running inside the VM? (Ex. graphics card, digital camera, card reader for smart card authentication.) Is it possible to say anything about "general limitations" of VMs, or is this wholly dependent on the specific VM?

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  • Bacula vs. BackupPC

    - by chronoz
    I have been googling about the differences between them. Bacula has lots of roles BackupPC is easier to configure Bacula works with agent, not rsync (great for Windows backups) It seems that Bacula is most often compared to Amanda though, while BackupPC seems a perfectly lovely and popular backup distribution to. I currently backup my servers with rsnapshot, but I am looking for a professional scalable solution that could also back-up 50 hosts without problems. Preferably a solution that can offer bare metal restores for my Linux servers. I am not looking to reinstall the exact same version of Plesk, the software, etc...

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  • What are the mandatory Linux kernel modules to run inside of ESXi

    - by Marcin
    I'm used to rolling my own kernels for servers, as it nicely minimizes the number of exploits (and the resulting patches) to take care of. In a traditional (bare metal) world, the whole process is about knowing what you have (hardware), and what you need (Ethernet, IPv4, iptables, etc.) In a virtualized environment, some things stay the same (still need Ethernet and IPv4), some things go away (power management), and then there are some new needs (vxnet3, or vmware-tools, even though that's compiled outside of the kernel). So my question mostly concerns itself with the last two categories: what can I remove completely, and what new stuff do I want? For example, what IO scheduler do I want, if all my disk operations are going through another filesystem/scheduler/cache to get to the virtual disk? Do I need hyper-threading enabled, or is the VM going to show them to me anyway as a CPU anyway? Do I need Large Receive Offload turned on, or is that something that the hypervisor's network drivers are going to do for me?

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  • How to convert an image to a .dwg file

    - by erikric
    My girlfriend is making an art project where she is having an image printed and cut out on a metal plate. The firm responsible for doing this is demanding a .dwg file (and something called polyline; some sort of setting maybe?). Neither of us have heard about this file format, and I find the information about it quite confusing. Most pages seem to link to some schetchy "FooToBarConverter" software, that I frankly don't trust. Could someone please enlighten us on what we need to do, or point to some safe and preferably free software that could do this? (An explanation of the dwg format and the polyline thing would also be much appreciated)

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  • How can I set up VLANs in a way that won't put me at risk for VLAN hopping?

    - by hobodave
    We're planning to migrate our production network from a VLAN-less configuration to a tagged VLAN (802.1q) configuration. This diagram summarizes the planned configuration: One significant detail is that a large portion of these hosts will actually be VMs on a single bare-metal machine. In fact, the only physical machines will be DB01, DB02, the firewalls and the switches. All other machines will be virtualized on a single host. One concern that has been is that this approach is complicated (overcomplicated implied), and that the VLANs are only providing an illusion of security, because "VLAN hopping is easy". Is this a valid concern, given that multiple VLANs will be used for a single physical switch port due to virtualization? How would I setup my VLANs appropriately to prevent this risk? Also, I've heard that VMWare ESX has something called "virtual switches". Is this unique to the VMWare hypervisor? If not, is it available with KVM (my planned hypervisor of choice)?. How does that come into play?

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  • Enterprise online backup providers

    - by PHLiGHT
    We've used Iron Mountain's LiveVault service but found that it was only good for file level backups. We liked how it backed up every 15 minutes. It doesn't support Exchange 2007-10 and the web interface was very poor. Who else is everyone using? The most notable names in online backup such as Mozy and Carbonite don't really seem suitable for larger companies. We have SQL, Exchange and Sharepoint servers and are looking to virtualize in the near future. Until then bare metal restore capability would be nice. We are currently using Backup Exec 12.5 but that can be so troublesome at times. We have about 2 TB of data. 1TB is archival data.

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  • How can I boot directly to a VirtualBox (.vdi) image (possibly via hypervisor)?

    - by Josh
    I have a system image in VirtualBox as a .vdi file. I am aware of how to convert this to other formats of VM using VBoxManage. I'd like to boot this image locally on a number of clients which currently have no OS installed. What's the simplest way to boot into this VM from bare metal? I'm willing to install some minimal OS if necessary. Is this even possible? Maybe there's something out there along the lines of VDI Blaster that will load a locally stored VM?

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  • Windows Server 2008 R2 backup includes volume with MSSQL data

    - by J F
    I'm using wbadmin to schedule image backup every night on a Windows Server 2008 R2 Standard server. Ever since installing MS-SQL 2008 Express R2, wbadmin wants to also backup the volume where the MS-SQL data files are located (L:). I'm using -allCritical to make sure bare metal restore will work. command-line: wbadmin start backup -backupTarget:\\myserver\backup$\myserver\%DATE% -include:C: -allCritical -quiet I don't want to do this, because I'm backing up MS-SQL manually elsewhere. It worked just fine only taking C: before I installed MS-SQL.

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  • VMWare Hypervisor vSphere 5 - VM static ip from VLAN NAT

    - by Ian Livingstone
    I have a VMWare vSphere 5 Hypervisor server that has a static ip address assigned to it by VLAN that is configured to perform NAT. The static IP is assigned to the bare metal server via the NIC's mac address. I want to setup a guest machine to also have a static ip address, how can I go about having this setup? I have assigned a IP for the guest's MAC Address but it doesn't seem to be working as when I ping the ip address it does not respond. The guest is running ubuntu 10.04 server edition. I am trying to assign it a static public ip address. Any help would be greatly appreciated.

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  • Why has ESXi 5.0 not used the software RAID configuration on my test server?

    - by kafka
    I've got a test server which was running WS 2008 Enterprise on the bare metal. It was correctly using the software RAID 1 configuration (2x250 GB disks which appeared as one disk), setup on the Dell Poweredge T110 (which meets compatibility requirements) without requiring any extra setup from me. (As an aside I'm fairly sure it's software RAID, as we didn't spec a hardware RAID controller, if that's of any importance in this situation). I am now testing installing ESXi 5.0 on this server to run some VMs. I've successfully installed ESXi, and imported a VM fine, but it's showing 2 x 250 GB disks available as datastores. However they should be appearing as one volume. When I boot the server, there is a RAID configuration screen you can enter, and I'm guessing this is what I'll have to do at some stage, but now need to be very careful because there is one disk which contains data that I want to be mirrored on the other disk. What is the best thing to do in this situation?

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