• CentOS 7创建自定义KVM模板(现有KVM迁移到另外一台机)


    说明:创建KVM模板有个好处,不用每次都运行命令创建,并且可以为迁移做准备。

    一、创建KVM模板

    1、下载iso(省略)

    2、创建磁盘

    qemu-img create -f raw centos7.raw 50G

    3、编写XML

    <domain type='kvm'>
      <name>centos7</name>
      <uuid>354ca6f8-d70e-485b-8d0b-2ec295056e09</uuid>
      <memory unit='KiB'>1048576</memory>
      <currentMemory unit='KiB'>1048576</currentMemory>
      <vcpu placement='static'>1</vcpu>
      <os>
        <type arch='x86_64' machine='pc-i440fx-rhel7.0.0'>hvm</type>
        <boot dev='cdrom'/>
      </os>
      <features>
        <acpi/>
        <apic/>
      </features>
      <cpu mode='custom' match='exact' check='partial'>
        <model fallback='allow'>Westmere</model>
      </cpu>
      <clock offset='utc'>
        <timer name='rtc' tickpolicy='catchup'/>
        <timer name='pit' tickpolicy='delay'/>
        <timer name='hpet' present='no'/>
      </clock>
      <on_poweroff>destroy</on_poweroff>
      <on_reboot>restart</on_reboot>
      <on_crash>destroy</on_crash>
      <pm>
        <suspend-to-mem enabled='no'/>
        <suspend-to-disk enabled='no'/>
      </pm>
      <devices>
        <emulator>/usr/libexec/qemu-kvm</emulator>
        <disk type='file' device='disk'>
          <driver name='qemu' type='raw'/>
          <source file='/kvm/image/centos7.raw'/>
          <target dev='vda' bus='virtio'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
        </disk>
        <disk type='file' device='cdrom'>
          <driver name='qemu' type='raw' cache="none" io="native"/>
          <source file="/kvm/iso/centos7.iso" />
          <target dev='hda' bus='ide'/>
          <readonly/>
          <address type='drive' controller='0' bus='0' target='0' unit='0'/>
        </disk>
        <controller type='usb' index='0' model='ich9-ehci1'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x7'/>
        </controller>
        <controller type='usb' index='0' model='ich9-uhci1'>
          <master startport='0'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>
        </controller>
        <controller type='usb' index='0' model='ich9-uhci2'>
          <master startport='2'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x1'/>
        </controller>
        <controller type='usb' index='0' model='ich9-uhci3'>
          <master startport='4'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x2'/>
        </controller>
        <controller type='pci' index='0' model='pci-root'/>
        <controller type='ide' index='0'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
        </controller>
        <controller type='virtio-serial' index='0'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
        </controller>
        <interface type='bridge'>
          <mac address='52:54:00:83:6b:d7'/>
          <source bridge='br0'/>
          <model type='virtio'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
        </interface>
        <serial type='pty'>
          <target type='isa-serial' port='0'>
            <model name='isa-serial'/>
          </target>
        </serial>
        <console type='pty'>
          <target type='serial' port='0'/>
        </console>
        <channel type='unix'>
          <target type='virtio' name='org.qemu.guest_agent.0'/>
          <address type='virtio-serial' controller='0' bus='0' port='1'/>
        </channel>
        <input type='tablet' bus='usb'>
          <address type='usb' bus='0' port='1'/>
        </input>
        <input type='mouse' bus='ps2'/>
        <input type='keyboard' bus='ps2'/>
        <graphics type='vnc' port='5900' autoport='no' listen='0.0.0.0'>
          <listen type='address' address='0.0.0.0'/>
        </graphics>
        <video>
          <model type='cirrus' vram='16384' heads='1' primary='yes'/>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
        </video>
        <memballoon model='virtio'>
          <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
        </memballoon>
      </devices>
    </domain>

    提示:上面的模板自行根据需要修改,完成后可以验证(virt-xml-validate centos7.xml)。

    4、载入模板并启动

    virsh define centos7.xml
    virsh start centos7

    二、迁移KVM到另外一台机

    通过上面的操作可以简单的知道迁移的步骤。

    1、先迁移镜像文件

    2、迁移XML文件,默认路径在(/etc/libvirt/qemu/centos7.xml),如果你采用上述xml进行KVM的配置,可以不用再默认路径上找。

    3、载入模板并启动

    参考:

    https://libvirt.org/format.html(XML文件格式官方说明)

    https://wiki.libvirt.org/page/Main_Page(官方命令行操作wiki)

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  • 原文地址:https://www.cnblogs.com/EasonJim/p/10090054.html
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