我在使用 libvirtd 时启动 debian 或 ubuntu netinstall 映像时遇到问题，我得到了菜单，但是在选择菜单选项安装时只得到了这个：
加载/install.amd/vmlinuz 失败：没有此文件或目录
我已经安装了 iso 并验证 debian netinstall iso 在 install.amd 目录中有 vmlinuz 文件等。
这是发生故障时我正在使用的域的 libvirtd xml：
<domain type='kvm'>
<name>myserver</name>
<uuid>d85a11d4-78d8-2425-527b-2adef6c952a9</uuid>
<memory unit='KiB'>18192</memory>
<currentMemory unit='KiB'>18192</currentMemory>
<vcpu placement='static'>1</vcpu>
<os>
<type arch='x86_64' machine='pc-i440fx-5.2'>hvm</type>
</os>
<features>
<acpi/>
<apic/>
<pae/>
</features>
<cpu mode='custom' match='exact' check='none'>
<model fallback='forbid'>qemu64</model>
</cpu>
<clock offset='utc'/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>restart</on_crash>
<devices>
<emulator>/usr/bin/qemu-system-x86_64</emulator>
<disk type='file' device='cdrom'>
<driver name='qemu' type='raw'/>
<source file="/var/lib/libvirt/boot/debian-11.3.0-amd64-netinst.iso"/>
<target dev='hda' bus='ide'/>
<readonly/>
<boot order='2'/>
</disk>
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2' cache='none'/>
<source file='/opt/storage/VMs/myserver.qcow2'/>
<target dev='vdb' bus='virtio'/>
<boot order='1'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk>
<controller type='usb' index='0' model='piix3-uhci'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
</controller>
<controller type='pci' index='0' model='pci-root'/>
<controller type='scsi' index='0' model='lsilogic'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
</controller>
<interface type='network'>
<mac address='52:54:00:4c:d1:73'/>
<source network='net-simplebridge'/>
<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>
<input type='keyboard' bus='usb'>
<address type='usb' bus='0' port='1'/>
</input>
<input type='mouse' bus='ps2'/>
<input type='keyboard' bus='ps2'/>
<graphics type='vnc' port='-1' autoport='yes' listen='127.0.0.1'>
<listen type='address' address='127.0.0.1'/>
</graphics>
<video>
<model type='vga' vram='8192' 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='0x06' function='0x0'/>
</memballoon>
<rng model='virtio'>
<backend model='random'>/dev/random</backend>
<address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
</rng>
</devices>
</domain>
上面的 xml 最终会变成这样：
/usr/bin/qemu-system-x86_64 -name guest=myserver,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-1-myserver/master-key.aes -machine pc-i440fx-5.2,accel=kvm,usb=off,dump-guest-core=off,memory-backend=pc.ram -cpu qemu64 -m 18 -object memory-backend-ram,id=pc.ram,size=18874368 -overcommit mem-lock=off -smp 1,sockets=1,cores=1,threads=1 -uuid d85a11d4-78d8-2425-527b-2adef6c952a9 -no-user-config -nodefaults -chardev套接字，id = charmonitor，fd = 34，服务器，nowait -mon chardev = charmonitor，id = monitor，模式 = control -rtc base = utc -no-shutdown -boot strict = on -device piix3-usb-uhci，id = usb，总线 = pci.0，地址 = 0x1.0x2 -device lsi，id = scsi0，总线 = pci.0，地址 = 0x4 -blockdev {“driver”：“file”，“filename”：“/var/lib/libvirt/boot/debian-11.3.0-amd64-netinst.iso”，“node-name”：“libvirt-2-storage”，“auto-read-only”：true，“discard”：“unmap”} -blockdev {“node-name”：“libvirt-2-format”，“read-only”：true，“driver”：“raw”，“file”：“libvirt-2-storage”} -device ide-cd，总线=ide.0，单元=0，驱动器=libvirt-2-format，id=ide0-0-0，bootindex=2 -blockdev {“driver”：“file”，“filename”：“/opt/storage/VMs/myserver.qcow2”，“node-name”：“libvirt-1-storage”，“cache”：{“direct”：true，“no-flush”：false}，“auto-read-only”：true，“discard”：“unmap”} -blockdev {“node-name”：“libvirt-1-format”，“read-only”：false，“cache”：{“direct”：true，“no-flush”：false}，“driver”：“qcow2”，“file”：“libvirt-1-storage”，“backing”：null} -device virtio-blk-pci，总线=pci.0，addr=0x5，驱动器=libvirt-1-format，id=virtio-disk1，bootindex=1，write-cache=on -netdev tap，fd=36，id=hostnet0，vhost=on，vhostfd=37 -device virtio-net-pci，netdev=hostnet0，id=net0，mac=52:54:00:4c:d1:73，总线=pci.0，addr=0x3 -chardev pty，id=charserial0 -device isa-serial，chardev=charserial0，id=serial0 -device usb-kbd，id=input0，总线=usb.0，端口=1 -vnc 127.0.0.1:0 -device VGA，id=video0，vgamem_mb=8，总线=pci.0，addr=0x2 -device virtio-ba
当手动执行此操作时，它可以在同一台机器上运行良好，并让我顺利进入安装过程：
qemu-system-x86_64 -vnc :0 -enable-kvm -serial stdio -curses -hda /opt/storage/VMs/myserver.qcow2 -m 2G -boot d -cdrom /var/lib/libvirt/boot/debian-11.3.0-amd64-netinst.iso
是否可以通过 libvirtd xml 配置获取“-cdrom”标志？或者还有其他建议？
答案1
<memory unit='KiB'>18192</memory>
这里您只为虚拟机分配了 18 MB 内存，而使用 QEMU 直接启动虚拟机时则有 2 GB 内存。我估计内存不足以加载 initrd。
<cpu mode='custom' match='exact' check='none'><model fallback='forbid'>qemu64</model></cpu>
与您的问题无关，但仍然值得更改，因为qemu64会导致糟糕的性能。 选择一个与您的主机操作系统相似的现代模型名称，或将其更改为使用mode='host-passthrough或mode=host-model。