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使用virsh edit命令修改虛擬機內存不生效問題

2023-09-27 08:23:58
126
0

今天遇到一個問題，使用virsh edit <vm>命令調整(zheng)了虛擬機的內存大小后， 保(bao)存退出，再次使用virsh edit <vm>命令查看虛擬機配置文件(jian)，發現內存又(you)改回了先前的值(zhi)。

 

我的原始配置(zhi)文件(jian)是(shi)：

 

<domain type='kvm'>

  <name>vm21</name>

  <uuid>81a67c14-ae40-4c86-8b1a-0b19dfb4575b</uuid>

 ; <memory unit='KiB'>2029144</memory>

  <currentMemory unit='KiB'>2029144</currentMemory>

  <memoryBacking>

    <hugepages>

      <page size='2048' unit='KiB'/>

    </hugepages>

    <access mode='shared'/>

  </memoryBacking>

  <vcpu placement='static' cpuset='8,10,12,14'>4<;/vcpu>

  <cputune>

&nbsp; ;  <vcpupin vcpu='0' cpuset='8'/>

    <vcpupin vcpu='1' cpuset='10'/>

 &nbsp;  <vcpupin vcpu='2' cpuset='12'/>

    <vcpupin vcpu='3' cpuset='14'/>

  </cputune>

  <resource>

    <partition>/machine</partition>

  </resource>

  <os>

  ;  <type arch='x86_64' machine='pc-i440fx-2.2'>hvm</type>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

  </features>

  <cpu mode='host-passthrough' check='none'>

    <topology sockets='1' cores='4' threads='1'/>

    <numa>

      <cell id='0' cpus='0-3' memory='4194304' unit='KiB' memAccess='shared'/>

    </numa>

  </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/local/bin/qemu-system-x86_64</emulator>

&nbsp;   <disk type='file' device='disk'&gt;

  &nbsp;   <driver name='qemu' type='qcow2'/>

 &nbsp; ;   <source file='/data/vms/vm21.img'/>

      <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'/>

  ;    <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>

&nbsp;   <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='network'&gt;

      <mac address='52:54:00:77:1d:e0'/>

      <source network='default'/>

      <model type='virtio'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

&nbsp;   <interface type='vhostuser'>

  &nbsp;   <mac address='52:54:00:00:24:6b'/>

      <source type='unix' path='/tmp/vm21.sock' mode='server'/>

      <model type='virtio'/>

  &nbsp;   <driver name='vhost' queues='4' rx_queue_size='1024' tx_queue_size='1024'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>

    </interface>

    <serial type='pty'>

      &lt;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'/>

  &nbsp; <input type='keyboard' bus='ps2'/>

    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>

      <listen type='address' address='0.0.0.0'/>

    </graphics>

    <video>

&nbsp;     <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>

    <rng model='virtio'>

&nbsp;     <backend model='random'>/dev/urandom</backend>

&nbsp;     <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>

    </rng>

  </devices>

</domain>

我想(xiang)把虛擬機內存(cun)改為2M，于是找到(dao)下面兩行(xing)：

  <memory unit='KiB'>2029144</memory>

  <currentMemory unit='KiB'>2029144</currentMemory>

將其修改為：

  <memory unit='KiB'>4194304</memory>

  <currentMemory unit='KiB'>4194304</currentMemory>

保存退出(chu)，virsh顯示(shi)一切OK：

[root@t620 SourceCode]# virsh edit vm21   
Domain vm21 XML configuration edited.

但是再次(ci)查(cha)看VM21的XML配置文件，發現這兩行(xing)又恢復(fu)為原(yuan)值(zhi)。

經過(guo)仔細觀察，發現在文檔中還有一處配置：

  <cpu mode='host-passthrough' check='none'>;

    <topology sockets='1' cores='4' threads='1'/>

    <numa>

      <cell id='0' cpus='0-3' memory='2029144' unit='KiB' memAccess='shared'/>

    </numa>

  </cpu>

同時修改這三處(chu)，問題解決(jue)。

 

根因(yin)： 虛擬機的XML文件要上下一致。上面定義2G內存，那么(me)在CPU的設置中(zhong)也(ye)需(xu)要用完這(zhe)2G內存。否則，系統會自動恢復成自認為正確(que)的值。

 

 

版權(quan)聲明：本文內(nei)容系天(tian)翼云實名用(yong)戶自發(fa)貢獻，版權(quan)歸原作(zuo)者所有，天(tian)翼云開發(fa)者社區不擁有其(qi)著作(zuo)權(quan)，亦不承擔(dan)相應法律責任，未經許可，不得(de)轉載。

如(ru)有疑問或爭議，請聯(lian)系ctyunbbs@chinatelecom.cn刪除(chu)。

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原創(chuang)

使用virsh edit命令修改虛擬機內存不生效問題

2023-09-27 08:23:58
126
0

今(jin)天遇到(dao)一個問題，使(shi)用virsh edit <vm>命令調整(zheng)了虛擬機的內存(cun)大小后， 保存退出(chu)，再次使用virsh edit <vm>命(ming)令查看虛擬機配置文件，發現內(nei)存(cun)又改回了先前的值。

 

我(wo)的原(yuan)始配置文(wen)件是：

 

<domain type='kvm'>

  <name>vm21</name>

  <uuid>81a67c14-ae40-4c86-8b1a-0b19dfb4575b</uuid>

  <memory unit='KiB'>2029144</memory>

  <;currentMemory unit='KiB'>2029144</currentMemory>

  <memoryBacking>

    <hugepages>

      &lt;page size='2048' unit='KiB'/>

    </hugepages>

    <access mode='shared'/>

  </memoryBacking>

  <vcpu placement='static' cpuset='8,10,12,14'>4</vcpu>

  <cputune>

    <vcpupin vcpu='0' cpuset='8'/>

&nbsp;   <vcpupin vcpu='1' cpuset='10'/>

    <vcpupin vcpu='2' cpuset='12'/>

    <vcpupin vcpu='3' cpuset='14'/>

  </cputune>

  <resource>

    <partition>/machine</partition>

  </resource>

  <os>

    <type arch='x86_64' machine='pc-i440fx-2.2'>hvm</type>

    <boot dev='hd'/>

  </os>

  <features>

    <acpi/>

    <apic/>

  </features>

  <cpu mode='host-passthrough' check='none'>

    <topology sockets='1' cores='4' threads='1'/>

    <numa>

      <cell id='0' cpus='0-3' memory='4194304' unit='KiB' memAccess='shared'/>

    </numa>

  </cpu>

  <clock offset='utc'>

&nbsp;   <timer name='rtc' tickpolicy='catchup'/>

 &nbsp;  <timer name='pit' tickpolicy='delay'/>

    <timer name='hpet' present='no'/&gt;

  </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/local/bin/qemu-system-x86_64<;/emulator>

    <disk type='file' device='disk'>

   &nbsp;  <driver name='qemu' type='qcow2'/>

      <source file='/data/vms/vm21.img'/>

&nbsp;     <target dev='vda' bus='virtio'/>

 &nbsp;    <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>

    </disk>

    <disk type='file' device='cdrom'>

      <driver name='qemu' type='raw'/>

   &nbsp;  <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>

  &nbsp; <controller type='usb' index='0' model='ich9-uhci1'>

    &nbsp; <master startport='0'/>

   &nbsp;  <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0' multifunction='on'/>

    </controller>

 &nbsp;  <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>

    &lt;controller type='pci' index='0' model='pci-root'/>

    &lt;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>

  &nbsp; <interface type='network'>

      <mac address='52:54:00:77:1d:e0'/>

    &nbsp; <source network='default'/>

      <model type='virtio'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>

    </interface>

&nbsp;   <interface type='vhostuser'>

      <mac address='52:54:00:00:24:6b'/>

      <source type='unix' path='/tmp/vm21.sock' mode='server'/>

      <model type='virtio'/>

      <driver name='vhost' queues='4' rx_queue_size='1024' tx_queue_size='1024'/>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>

    </interface>

    <serial type='pty'>

      <target type='isa-serial' port='0'>

   &nbsp;    <model name='isa-serial'/>

      </target>

    </serial>

    <console type='pty'>

      <target type='serial' port='0'/&gt;

    </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'/&gt;

    <graphics type='vnc' port='-1' autoport='yes' listen='0.0.0.0'>

      <listen type='address' address='0.0.0.0'/>

    </graphics>

    <video>

    &nbsp; <model type='cirrus' vram='16384' heads='1' primary='yes'/>

  ;    <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>

    </video>

    <memballoon model='virtio'&gt;

      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>

    </memballoon>

    <rng model='virtio'>

      <backend model='random'>/dev/urandom</backend>

      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>

    </rng>

  </devices>

</domain>

我(wo)想把虛擬機內存改為(wei)2M，于是(shi)找到下面兩行(xing)：

  <memory unit='KiB'>2029144</memory>

  <currentMemory unit='KiB'>2029144</currentMemory>

將其修改為：

  <memory unit='KiB'>4194304</memory>

  <currentMemory unit='KiB'>4194304</currentMemory>

保(bao)存(cun)退出，virsh顯(xian)示一(yi)切OK：

[root@t620 SourceCode]# virsh edit vm21   
Domain vm21 XML configuration edited.

但是再(zai)次查看VM21的XML配置(zhi)文(wen)件，發現這兩(liang)行又恢復為原值。

經過仔細(xi)觀察，發現在文檔中還有一處配置：

  <cpu mode='host-passthrough' check='none'>

&nbsp;   <topology sockets='1' cores='4' threads='1'/>

    <numa>

      <cell id='0' cpus='0-3' memory='2029144' unit='KiB' memAccess='shared'/>

    </numa>

  </cpu>

同時修(xiu)改這三處，問(wen)題解決。

 

根因： 虛擬機的XML文件要上下一致(zhi)。上面定義(yi)2G內存(cun)，那么(me)在(zai)CPU的設置(zhi)中也需要(yao)用完這2G內(nei)存(cun)。否(fou)則，系統會自(zi)動恢復(fu)成自(zi)認為正確的值(zhi)。

 

 

版(ban)權(quan)聲明(ming)：本文內容系天翼云實名用戶自發(fa)貢獻，版(ban)權(quan)歸原作者所有，天翼云開(kai)發(fa)者社區(qu)不(bu)擁有其著(zhu)作權(quan)，亦不(bu)承擔相應法律(lv)責任，未經許可(ke)，不(bu)得(de)轉(zhuan)載。

如有(you)疑(yi)問(wen)或(huo)爭議(yi)，請聯系ctyunbbs@chinatelecom.cn刪(shan)除。

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