This tutorial is about installing and configuring Red Hat Virtualization Host (RHVH) in a CentOS 6 (or higher) virtual machine. RHVH, the Red Hat Virtualization Host, is a fully supported, open source virtual machine hypervisor for the x86 platform. RHVH is a virtual machine hypervisor designed to run Red Hat Enterprise Linux workloads as virtual machines. RHVH includes a full Linux kernel, full hardware virtualization support, and a GUI for managing virtual machines.
Some of you might be familiar with the Red Hat Enterprise Linux (RHEL) virtualization product, but if you aren’t, that’s okay I’ll catch you up. RHVH is a virtualization product, which allows you to run multiple operating systems on a single machine. One of the main advantages of using the virtualization product is that you can run multiple OS’s without having to reboot the machine. This is beneficial to both users and administrators because it allows them to test their operating systems on the same machine, without having to have two machines running at the same time.
Red Hat Virtualization Host (RHVH) is a minimal operating system based on Red Hat Enterprise Linux that provides a simple method of configuring a physical machine as a hypervisor in a Red Hat Virtualization environment. Initially, it contains only the packages needed to function as a hypervisor and integrate with Red Hat Virtualization Manager, and includes a cockpit user interface to monitor and manage the host.
Red Hat Virtualization Host and its guest virtual machines are managed by Red Hat Virtualization Manager through a service called Virtual Desktop and Server Manager (VDSM). Red Hat Virtualization Manager communicates with the vdsmd service on each Red Hat virtualization node to monitor and manage memory, storage, and networking, and to create, migrate, and destroy virtual machines.
Table of Contents
Installing Red Hat Virtualization Host (RHVH)
Red Hat Virtualization Host is delivered as an ISO image through the customer portal (https:// access.redhat.com/). To obtain an image, log into the customer portal and click Red Hat Virtualization. Click on the Recent Download button to go to the product download page. Find the Red Hat Virtualization Host image and click Download Now.
Once you have an ISO image, you can use it to create bootable media to install the operating system. If you are unsure how to do this, refer to the Creating Media chapter in the Red Hat Enterprise Linux 7 Installation Guide at https://access.redhat.com/ documentation/ for instructions. You can then use bootable media to start the installation process on the new host.
The installer uses the same software as Red Hat Enterprise Linux, a system called Anaconda. You can install Red Hat Virtualization Host interactively or perform an automatic installation based on Kickstart. This section is dedicated to the manual installation process.
When the installation program is started in manual interactive mode, the graphical user interface is activated. On the first screen you will see the following question: which language do you want to use for the installation? English (USA) is selected by default. Click Next after selecting the desired language.
The following screen shows a number of different configuration options in the hub-and-spoke model. You can select these options in any order to customize different aspects of the installation, and you can return to these options if you change your mind about any of them before the installation begins.
– DATE & TIME sets the clock. You can set the time zone for a host using the table or by selecting by region and city. UTC (Coordinated Universal Time) is set in the Etc. menu item.
– KEYBOARD is used to set the type of physical keyboard connected to the host.
– INSTALLATION DESTINATION specifies how to format and partition the local disk for Red Hat Virtualization Host. There are two options for this section.
1. Automatic partition configuration is strongly recommended by Red Hat. This mode automatically determines and applies the optimal memory configuration for the available memory. The /boot configuration uses a standard partition, but/and some other file systems are created on thinly provisioned logical volumes.
2. I’m going to set up partitioning that allows you to adjust the size and location of the file system on the Red Hat virtualization host. But to use it properly, you need to understand which directories need to be on which filesystems, which cannot be on individual filesystems, and what their size requirements are. In general, it is easier and safer to use the automatic settings, except in special cases where manual settings are required.
– NETWORK & HOSTNAME configures the network settings. By default, all detected network interfaces are disabled. You need to select the interfaces you want to activate from the list in the left pane, and then click the button in the top right corner of ON. By default, DHCP is used to configure the network interface. This screen also allows you to manually set the host name for Host
You must also click the Configure button to ensure that the interface is automatically activated at startup. Click on the General tab and make sure the Automatically connect to this network when available box is selected. The other tabs in the Network Configuration dialog box allow you to manually configure the IP address, netmask, and other information, create associated interfaces, or perform other advanced configuration tasks.
Message: Make sure the Automatically connect to this network when available option is enabled, otherwise the network interface will not appear automatically when the host is rebooted.
– You can also configure the KDUMP and SECURITY POLICY settings for Red Hat Virtualization Host, but the system works fine with the default settings.
After clicking Start Installation, the installation will begin and a new screen with a progress bar will be displayed. This screen also shows two additional configuration items:
- ROOT PASSWORD allows you to set a root password on the host so that you can log in for maintenance purposes.
- USER CREATION allows you to create an additional unauthorized user on the Red Hat virtualization host. This is not recommended for safety reasons. In general, the Red Hat Virtualization host is managed through the Red Hat Virtualization Manager management portal.
When the installation is complete, click Reboot to restart and boot the new Red Hat Virtualization host. Log in to the physical console as root with the password you set during installation. When you log in, the terminal displays the host’s current status and the URL of its Cockpit management console.
Red Hat Virtualization Host 4.1 (el7.4)
Kernel 3.10.0-693.el7.x86_64 to x86_64rhvh login: root
the state of the node : OK
See ‘nodectl check’ for more information.
Adding a RedHat Virtualization Host to RHV
After installing Red Hat Virtualization Host, it must be added to the Red Hat Virtualization environment. Assign the Red Hat virtualization host to a specific data center. This determines the amount of virtual machines, storage and network resources available to the host. The hosts in the data center are also organized into clusters. A cluster is a collection of hosts that share a common storage and network infrastructure and act as a migration domain within which virtual machines can be moved from one host to another. Hosts in the same cluster should generally be standardized and use the same make, model, hardware, and firmware or BIOS version to ensure consistent performance from host to host.
Use your Red Hat Virtualization Manager management portal to add and configure a new Red Hat virtualization host as part of the environment.
Follow these steps to manually add a new Red Hat virtualization host to the environment through the Administration Portal:
1. Log in to the administration portal as an administrator with the correct password and set the authentication domain to internal.
2. Click on the Hosts tab.
3. Click New to open the New Host dialog box.
In this form, a set of configuration parameters must be entered to add a new Red Hat virtualization host to the :
By default, Red Hat Virtualization Manager automatically adjusts the firewall rules on the added Red Hat virtualization host to allow all necessary network connections. Under Advanced settings, you can disable this feature by unchecking the Automatically configure host firewall checkbox. Normally you should not have to do this unless you are manually managing the host firewall in some other way.
4. Click OK to configure the host. Red Hat Virtualization Manager connects to the host via SSH and makes the necessary configuration changes. If errors are reported, you can use the administration portal to remove the host from the environment, resolve the reported issue, and try again.
5. In the administration portal, click on the Hosts tab and wait for the new host to appear. Initially it should appear as Install, but after a while it should change to Up via Non Responsive.
RedHatVirtualization Host Management
Red Hat Virtualization Host 4 includes a new web-based administration interface. This interface allows you to manage or monitor individual nodes remotely via a web browser.
Officially, direct administration of Red Hat Virtualization Host via manual SSH connections is not supported, but administration via the Cockpit interface is. The interface can display a variety of information, such as. For example, host status, standalone engine status, virtual machines and virtual machine statistics.
Some of the other administrative actions that can be performed through the Cockpit on a Red Hat virtualization host include the following:
- Displays a list of virtual machines running on the host.
- Displays a list of virtual machines in the host cluster.
- Full statistics on running virtual machines.
- Provide console access to running virtual machines.
- running virtual machines.
- Stop or disconnect power to virtual machines.
- Edit the vdsm.conf file.
- Manage the vdsmd service.
- Deploy Red Hat Virtualization Manager, which installs itself.
The Cockpit user interface is accessible through HTTPS connections using port 9090 on the Red Hat virtualization host. The Cockpit UI URL is displayed when you log in to the physical host console as root.
Message: Like the Red Hat Virtualization Manager management portal, the Cockpit service on Red Hat Virtualization Host can provide a TLS certificate for an HTTPS connection signed by a certificate authority that your web browser does not recognize. There are several ways around this, including adding a security exception for this certificate in your web browser.
To log into the Cockpit management interface, use the root user and password you specified when installing the host.
After the manual installation of RHVH, you can use the Cockpit to register a host for the software update in the content distribution network. The basic procedure is as follows:
1. Log in to the RHVH host with Cockpit as root.
2. On the Host tab, in the Subscriptions sub-tab, click Register System. To register, use the customer portal username and password associated with your hosting rights.
3. Use subscription-manager in the Terminal sub-tab of the shell prompt to enable the rhel-7-server-rhvh-4-rpms repository:
subscription-manager repos –enable=rhel-7-server-rhvh-4-rpms
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