Oracle Audio Technologies E10898-02 manual Management Domain, Domains, Creating Virtual Machines

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Managing Domains

any instruction is executed which would violate the isolation with other guests or dom0. In the current implementation, there may be performance penalty for certain types of guests and access types, but hardware virtualization also allows many Microsoft Windows™ operating systems and legacy operating systems to run unmodified.

2.4 Management Domain

Most of the responsibility of hardware detection in a Oracle VM Server environment is passed to the management domain, referred to as domain zero (or dom0). The dom0 kernel is actually a complete Linux kernel with support for a broad array of devices, file systems, and software RAID and volume management. In Oracle VM Server, the dom0 is tasked with providing access to much of the system hardware, creating, destroying and controlling guest operating systems, and presenting those guests with a set of common virtual hardware.

2.5 Domains

Domains other than the management domain (dom0) are referred to as domU. These domains are unprivileged domains with no direct access to the hardware or device drivers. Each domU is started by Oracle VM Server in dom0.

2.6 Hardware Virtualization Vs. Paravirtualization

Oracle VM Server uses paravirtualization, not binary translation. That is, the source code of the operating system is modified to support virtualization.

Binary translation is neither faster, nor slower, than hardware virtualization. Whether binary translation or hardware virtualization is more efficient than paravirtualization depends on the implementation of the binary translation and hardware virtualization, and the applications and operating system running as a guest on the system.

Binary translation and hardware virtualization, is required if you are using an operating system where it is impractical to do paravirtualization, for example, if the source code is not available such as for Microsoft Windows™, or the user base is not large enough to sustain a paravirtualization effort such as for the Linux 2.4.x kernel. In many situations, paravirtualization may perform better than binary translation as operations that cause a hypervisor interaction can be grouped and reused, rather than each event requiring its own hypervisor interaction.

2.7 Creating Virtual Machines

Create virtual machines (guests) using the Oracle VM Server virt-install command-line tool, or using a Virtual Machine Template in Oracle VM Manager. See Chapter 4, "Creating a Guest" and the Oracle VM Manager User’s Guide for more information.

2.8 Managing Domains

Manage domains using the Oracle VM Server xm command-line tool, or using Oracle VM Manager. See Chapter 5, "Domain Monitoring and Administration" and the Oracle VM Manager User’s Guide for more information.

Migrate domains using the xm migrate command. See Chapter 6, "Domain Live Migration" for more information.

Oracle VM Server 2-3

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Contents February E10898-02Page Contents Command-Line Tools Oracle VM Server Configuration File Page Preface Accessibility of Code Examples in DocumentationTTY Access to Oracle Support Services Command SyntaxConventions Page Introduction to Virtualization What is Virtualization?Why Virtualize? Xen Technology Xen TechnologyOracle VM Oracle VM Architecture shows the components of Oracle VM Oracle VM4Oracle VM Server User’s Guide Oracle VM Server Oracle VM ServerHypervisor HypervisorDomains, Guests and Virtual Machines Domains Management DomainHardware Virtualization Vs. Paravirtualization Creating Virtual MachinesManaging Oracle VM Server Repositories Configuring Oracle VM ServerConfiguring Oracle VM Server Oracle VM Agent Oracle VM Agent Command-Line ToolConfiguring Oracle VM Agent Xmlrpc Configuring Oracle VM AgentStopping Oracle VM Agent Starting Oracle VM AgentMonitoring Oracle VM Agent Deploying Oracle VM AgentRemotely Starting a Guest with the Oracle VM Agent API Testing the Oracle VM Agent ConnectionRemotely Stopping a Guest with the Oracle VM Agent API Oracle VM Agent UtilitiesMonitoring a Guest with the Oracle VM Agent Deleting a Guest with the Oracle VM Agent6Oracle VM Server User’s Guide Supported Guest Operating Systems Creating a Guest-bit Hypervisor Supported Guest Operating Systems Supported Guest Operating SystemsCreating a Guest Using a Template Creating a Guest Using a TemplateMounting an ISO Enabling Registration of Guests with Oracle VM ManagerCreating a Guest Using virt-install Creating a Guest Using virt-installPress Enter Following question is displayed Would you like to enable graphics support yes or no? Creating a Paravirtualized Guest Manually Creating a Paravirtualized Guest ManuallyCreating the Root File System Populating the Root File System Configuring the GuestCreating a Hardware Virtualized Guest Manually Creating a Hardware Virtualized Guest ManuallyEdit /mnt/etc/sysconfig/network-scripts/ifcfg-eth0 Use VNCViewer to display the guest If you see this error message Restart the guest, using the xm command-line tool Installing Paravirtual Drivers Installing Paravirtual Drivers 16Oracle VM Server User’s Guide Domain Lifecycle Domain Monitoring and AdministrationUsing the xm Command-Line Interface Viewing Host Information Using the xm Command-Line InterfaceMonitoring Domains Using the xm Command-Line Interface 4Oracle VM Server User’s Guide Creating a Shared Virtual Disk for Live Migration Creating a Shared Virtual Disk Using OCFS2 on iSCSIDomain Live Migration Delete entries that you do not want to use, for example Creating a Shared Virtual Disk for Live MigrationCreating a Shared Virtual Disk Using OCFS2 on SAN Adding a Shared Virtual Disk Using NFS Migrating a Domain Migrating a Domain6Oracle VM Server User’s Guide Managing Oracle VM Server Repositories Repository Configuration FileOracle VM Server Repositories Repository Mount OptionsOracle VM Server Repositories Adding a RepositoryRemoving a Repository Command-Line Tools Start ConfigureStop RestartNname --name=name HelpRRAM --ram=RAM UUUID --uuid=UUIDVnc Bvalue --bridge=valueVncport=port SdlArch=arch Os-variant=variantNoapic Llocation --location=location ParavirtVif-type=type Xargs --extra-args=argsDestroy domain-id Console domain-idDmesg --clear Help --long optionList --long --label domain-id =file --defconfig=fileLog Migrate domain-id host -l --live -r=MB --resource=MBShutdown -a -w domain-id Restore statefileUnpause domain-id TopOracle VM Server Configuration File Logfile location Oracle VM Server Configuration FileLoglevel Critical or Fatal Error Warn or Warning Info Debug Xend-unix-server yes no Xend-http-server yes noXend-tcp-xmlrpc-server yes no Xend-unix-xmlrpc-server yes noXend-relocation-port port Xend-port portXend-address IPAddress Xend-relocation-address IPAddressDom0-min-mem memory Enable-dump yes noDom0-cpus CPUs External-migration-tool tool6Oracle VM Server User’s Guide Configuration File Example Guest Configuration FilesConfiguration File Example Oracle VM Agent Architecture Oracle VM Agent ArchitectureOracle VM Agent Deployment Oracle VM Agent DeploymentOracle VM Agent Architecture D-3 4Oracle VM Server User’s Guide Oracle VM Server Directories TroubleshootingDebugging Tools Guest Console Access Using DhcpOracle VM Server Command-Line Tools Using DhcpGuest Console Access Hardware Virtualized Guest Console Not Displayed Cannot Display Graphical Installer When Creating GuestsCannot Display Graphical Installer When Creating Guests Wallclock Time Skew Problems Setting the Guest’s ClockMouse Pointer Tracking Problems Mouse Pointer Tracking ProblemsHardware Virtualized Guest Killed Hardware Virtualized Guest Windows InstallationHardware Virtualized Guest Devices Not Working as Expected Hardware Virtualized Guest KilledAttaching to a Console with the Grub Boot Loader Firewall Blocks NFS AccessTAP Disks with Paravirtualized Guests CD-ROM Image Not Found8Oracle VM Server User’s Guide Glossary Oracle VM Server Oracle VM AgentOracle VM Manager Paravirtualized machineVif Utility ServerVirtual disk Virtual Machine VMGlossary-4 Index-1 IndexIndex-2