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      Installing Virtualization Components

      This chapter describes how to install virtualization components in openEuler.

      Minimum Hardware Requirements

      The minimum hardware requirements for installing virtualization components on openEuler are as follows:

      • AArch64 processor architecture: ARMv8 or later, supporting virtualization expansion
      • x86_64 processor architecture, supporting VT-x
      • 2-core CPU
      • 4 GB memory
      • 16 GB available disk space

      Installing Core Virtualization Components

      Installation Methods

      Prerequisites

      Procedure

      1. Install the QEMU component.

        yum install -y qemu
        
      2. Install the libvirt component.

        yum install -y libvirt
        
      3. Start the libvirtd service.

        systemctl start libvirtd
        

      NOTE: The KVM module is integrated in the openEuler kernel and does not need to be installed separately.

      Verifying the Installation

      1. Check whether the kernel supports KVM virtualization, that is, check whether the /dev/kvm and /sys/module/kvm files exist. The command and output are as follows:

        $ ls /dev/kvm
        /dev/kvm
        
        $ ls /sys/module/kvm
        parameters  uevent
        

        If the preceding files exist, the kernel supports KVM virtualization. If the preceding files do not exist, KVM virtualization is not enabled during kernel compilation. In this case, you need to use the Linux kernel that supports KVM virtualization.

      2. Check whether QEMU is successfully installed. If the installation is successful, the QEMU software package information is displayed. The command and output are as follows:

        $ rpm -qi qemu
        Name        : qemu
        Epoch       : 2
        Version     : 4.0.1
        Release     : 10
        Architecture: aarch64
        Install Date: Wed 24 Jul 2019 04:04:47 PM CST
        Group       : Unspecified
        Size        : 16869484
        License     : GPLv2 and BSD and MIT and CC-BY
        Signature   : (none)
        Source RPM  : qemu-4.0.0-1.src.rpm
        Build Date  : Wed 24 Jul 2019 04:03:52 PM CST
        Build Host  : localhost
        Relocations : (not relocatable)
        URL         : http://www.qemu.org
        Summary     : QEMU is a generic and open source machine emulator and virtualizer
        Description :
        QEMU is a generic and open source processor emulator which achieves a good
        emulation speed by using dynamic translation. QEMU has two operating modes:
        
         * Full system emulation. In this mode, QEMU emulates a full system (for
           example a PC), including a processor and various peripherals. It can be
           used to launch different Operating Systems without rebooting the PC or
           to debug system code.
         * User mode emulation. In this mode, QEMU can launch Linux processes compiled
           for one CPU on another CPU.
        
        As QEMU requires no host kernel patches to run, it is safe and easy to use.
        
      3. Check whether libvirt is successfully installed. If the installation is successful, the libvirt software package information is displayed. The command and output are as follows:

        $ rpm -qi libvirt
        Name        : libvirt
        Version     : 5.5.0
        Release     : 1
        Architecture: aarch64
        Install Date: Tue 30 Jul 2019 04:56:21 PM CST
        Group       : Unspecified
        Size        : 0
        License     : LGPLv2+
        Signature   : (none)
        Source RPM  : libvirt-5.5.0-1.src.rpm
        Build Date  : Mon 29 Jul 2019 08:14:57 PM CST
        Build Host  : 71e8c1ce149f
        Relocations : (not relocatable)
        URL         : https://libvirt.org/
        Summary     : Library providing a simple virtualization API
        Description :
        Libvirt is a C toolkit to interact with the virtualization capabilities
        of recent versions of Linux (and other OSes). The main package includes
        the libvirtd server exporting the virtualization support.
        
      4. Check whether the libvirt service is started successfully. If the service is in the active state, the service is started successfully. You can use the virsh command line tool provided by the libvirt. The command and output are as follows:

        $ systemctl status libvirtd
        ● libvirtd.service - Virtualization daemon
           Loaded: loaded (/usr/lib/systemd/system/libvirtd.service; enabled; vendor preset: enabled)
           Active: active (running) since Tue 2019-08-06 09:36:01 CST; 5h 12min ago
             Docs: man:libvirtd(8)
                   https://libvirt.org
         Main PID: 40754 (libvirtd)
            Tasks: 20 (limit: 32768)
           Memory: 198.6M
           CGroup: /system.slice/libvirtd.service
                   ─40754 /usr/sbin/libvirtd
        

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