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The Remote Viewer application provides users with a graphical console for connecting to virtual machines. Once installed, it is called automatically when attempting to open a SPICE session with a virtual machine. Alternatively, it can also be used as a standalone application. Remote Viewer is included in the virt-viewer package provided by the base Enterprise Linux Workstation and Enterprise Linux Server repositories.
The Remote Viewer application provides users with a graphical console for connecting to virtual machines. Once installed, it is called automatically when attempting to open a SPICE session with a virtual machine. Alternatively, it can also be used as a standalone application.
Click Console. By default, the browser prompts you to download a file named console.vv. When you click to open the file, a console window opens for the virtual machine. You can configure your browser to automatically open these files, such that clicking Console simply opens the console.
To access the serial console of a virtual machine, the user must have UserVmManager, SuperUser, or UserInstanceManager permission on that virtual machine. These permissions must be explicitly defined for each user. It is not enough to assign these permissions to Everyone.
Configuring single sign-on, also known as password delegation, allows you to automatically log in to a virtual machine using the credentials you use to log in to the VM Portal. Single sign-on can be used on both Enterprise Linux and Windows virtual machines.
The USB device will only be redirected if the virtual machine is active, in focus and is run from the VM Portal. USB redirection can be manually enabled each time a device is plugged in or set to automatically redirect to active virtual machines in the Console Options window.
The usbredir package enables USB redirection from Enterprise Linux clients to virtual machines. usbredir is a dependency of the virt-viewer package, and is automatically installed together with that package.
Enable USB Auto-Share: Select this check box to automatically redirect USB devices to the virtual machine. If this option is not selected, USB devices will connect to the client machine instead of the guest virtual machine. To use the USB device on the guest machine, manually enable it in the SPICE client menu.
Open in Full Screen: Select this check box for the virtual machine console to automatically open in full screen when you connect to the virtual machine. Press SHIFT + F11 to toggle full screen mode on or off.
If vdagent is not running on the client machine, the mouse can become captured in a virtual machine window if it is used inside a virtual machine and the virtual machine is not in full screen. To unlock the mouse, press Shift + F12.
If you are prompted to download a console.vv file when attempting to open a console to a virtual machine using the native client console option, and Remote Viewer is already installed, then you can manually associate console.vv files with Remote Viewer so that Remote Viewer can automatically use those files to open consoles.
When you use the native client console invocation option to open a console to a virtual machine, Remote Viewer will automatically use the console.vv file that the oVirt Engine provides to open a console to that virtual machine without prompting you to select the application to use.
You can also set the NUMA pinning policy automatically by selecting Resize and Pin NUMA from the CPU Pinning Polcy drop-down list under the CPU Allocation settings in the Resource Allocation tab:
You can configure a virtual machine for high performance, so that it runs with performance metrics as close to bare metal as possible. When you choose high performance optimization, the virtual machine is configured with a set of automatic, and recommended manual, settings for maximum efficiency.
Selecting this option automatically performs certain configuration changes to this virtual machine, which you can view by clicking different tabs. You can change them back to their original settings or override them. (See Automatic High Performance Configuration Settings for details.) If you change a setting, its latest value is saved.
The following table summarizes the automatic settings. The Enabled (Y/N) column indicates configurations that are enabled or disabled. The Applies to column indicates the relevant resources:
When you create a virtual machine, you automatically inherit UserVmManager privileges. This enables you to make changes to the virtual machine and assign permissions to the users you manage, or users who are in your Identity Management (IdM) or RHDS group. See the Administration Guide for more information.
If a user is assigned permissions to only one virtual machine, single sign-on (SSO) can be configured for the virtual machine. With single sign-on enabled, when a user logs in to the VM Portal, and then connects to a virtual machine through, for example, a SPICE console, users are automatically logged in to the virtual machine and do not need to type in the user name and password again. Single sign-on can be enabled or disabled on a per virtual machine basis. See Configuring Single Sign-On for Virtual Machines for more information on how to enable and disable single sign-on for virtual machines.
If you are removing all host devices directly attached to the virtual machine in order to add devices from a different host, you can instead add the devices from the desired host, which will automatically remove all of the devices already attached to the virtual machine.
In oVirt, each NVDIMM device passed to a virtual machine has an automatically-assigned label area with a fixed size of 128 KB. IBM POWER hardware, and 128 KB is the minimum label size allowed by QEMU.
If required, you can change the driver type to VirtIO manually after the import. To change the driver type after a virtual machine has been imported, see Editing network interfaces. If the network device uses driver types other than e1000 or rtl8139, the driver type is changed to VirtIO automatically during the import. The Attach VirtIO-drivers option allows the VirtIO drivers to be injected to the imported virtual machine files so that when the driver is changed to VirtIO, the device will be properly detected by the operating system.
For cluster levels 4.3 or later, auto converge is enabled by default for all built-in migration policies, and migration compression is enabled by default for only the Suspend workload if needed migration policy. You can change these parameters when adding a new migration policy, or by modifying the MigrationPolicies configuration value.
The Auto Converge migrations option allows you to set whether auto-convergence is used during live migration of virtual machines. Large virtual machines with high workloads can dirty memory more quickly than the transfer rate achieved during live migration, and prevent the migration from converging. Auto-convergence capabilities in QEMU allow you to force convergence of virtual machine migrations. QEMU automatically detects a lack of convergence and triggers a throttle-down of the vCPUs on the virtual machine.
oVirt Engine automatically initiates live migration of all virtual machines running on a host when the host is moved into maintenance mode. The destination host for each virtual machine is assessed as the virtual machine is migrated, in order to spread the load across the cluster.
From version 4.3, all virtual machines defined with manual or automatic migration modes are migrated when the host is moved into maintenance mode. However, for high performance and/or pinned virtual machines, a Maintenance Host window is displayed, asking you to confirm the action because the performance on the target host may be less than the performance on the current host.
The Engine automatically initiates live migration of virtual machines in order to maintain load-balancing or power-saving levels in line with scheduling policy. Specify the scheduling policy that best suits the needs of your environment. You can also disable automatic, or even manual, live migration of specific virtual machines where required.
The ability to disable automatic migration and require a virtual machine to run on a particular host is useful when using application high availability products, such as Red Hat High Availability or Cluster Suite.
When you place a host into maintenance mode, the virtual machines running on that host are automatically migrated to other hosts in the same cluster. You do not need to manually migrate these virtual machines.
When a virtual server is automatically migrated because of the high availability function, the details of an automatic migration are documented in the Events tab and in the engine log to aid in troubleshooting, as illustrated in the following examples:
High availability is recommended for virtual machines running critical workloads. A highly available virtual machine is automatically restarted, either on its original host or another host in the cluster, if its process is interrupted, such as in the following scenarios:
A template is a copy of a virtual machine that you can use to simplify the subsequent, repeated creation of similar virtual machines. Templates capture the configuration of software, configuration of hardware, and the software installed on the virtual machine on which the template is based. The virtual machine on which a template is based is known as the source virtual machine. 2b1af7f3a8