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Hi Daniel,
I have noticed that it will fail exactly as you said if <cdrom> is first in the boot order, if <hd> is first in the boot order the XML validates and it starts as usual. 2018-08-09 11:39:28.625+0000: starting up libvirt version: 3.9.0, package: 14.el7_5.6 (CentOS BuildSystem <http://bugs.centos.org>, 2018-06-27-14:13:57, x86-01.bsys.centos.org), qemu version: 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.4.1), hostname: devnode9.com
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name guest=kvm104,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-82-kvm104/master-key.aes -machine
pc-i440fx-rhel7.5.0,accel=kvm,usb=off,dump-guest-core=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 5827d6a9-ef0e-4331-9d0e-fa742c70d596 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-82-kvm104/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive file=http://distro.ibiblio.org:80/puppylinux/puppy-xenial/32/xenialpup-7.5-uefi.iso,format=raw,if=none,id=drive-ide0-0-1,readonly=on
-device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1,bootindex=2 -drive file=/dev/Kvmvol/kvm104_img,format=raw,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=32 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:3c:07:e0:c9,bus=pci.0,addr=0x3 -device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:4,password -device cirrus-vga,id=video0,bus=pci.0,addr=0x2
-device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
2018-08-09T11:39:28.690350Z qemu-kvm: -drive file=http://distro.ibiblio.org:80/puppylinux/puppy-xenial/32/xenialpup-7.5-uefi.iso,format=raw,if=none,id=drive-ide0-0-1,readonly=on: Driver 'http' is not whitelisted
2018-08-09 11:39:28.699+0000: shutting down, reason=failed
2018-08-09 11:40:04.963+0000: starting up libvirt version: 3.9.0, package: 14.el7_5.6 (CentOS BuildSystem <http://bugs.centos.org>, 2018-06-27-14:13:57, x86-01.bsys.centos.org), qemu version: 2.10.0(qemu-kvm-ev-2.10.0-21.el7_5.4.1), hostname: devnode9.com
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name guest=kvm104,debug-threads=on -S -object secret,id=masterKey0,format=raw,file=/var/lib/libvirt/qemu/domain-83-kvm104/master-key.aes -machine
pc-i440fx-rhel7.5.0,accel=kvm,usb=off,dump-guest-core=off -m 1024 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1 -uuid 5827d6a9-ef0e-4331-9d0e-fa742c70d596 -no-user-config -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-83-kvm104/monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc base=utc -no-shutdown -boot strict=on -device piix3-usb-uhci,id=usb,bus=pci.0,addr=0x1.0x2 -drive if=none,id=drive-ide0-0-1,readonly=on -device ide-cd,bus=ide.0,unit=1,drive=drive-ide0-0-1,id=ide0-0-1,bootindex=2
-drive file=/dev/Kvmvol/kvm104_img,format=raw,if=none,id=drive-virtio-disk0,cache=none -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x4,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1 -netdev tap,fd=30,id=hostnet0,vhost=on,vhostfd=32 -device virtio-net-pci,netdev=hostnet0,id=net0,mac=00:16:3c:07:e0:c9,bus=pci.0,addr=0x3
-device usb-tablet,id=input0,bus=usb.0,port=1 -vnc 0.0.0.0:4,password -device cirrus-vga,id=video0,bus=pci.0,addr=0x2 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x5 -msg timestamp=on
So my best guess based on the logs is that http is simply being ignored when it is not set to primary, not sure if that is the desired behavior. Cheers.
From: Daniel P. Berrangé <berrange@xxxxxxxxxx>
Sent: 09 August 2018 12:27 To: Inception Hosting Cc: Vasiliy Tolstov; libvirt-users@xxxxxxxxxx Subject: Re: Mount URL as cdrom/iso KVM/QEMU On Thu, Aug 09, 2018 at 10:50:46AM +0000, Inception Hosting wrote:
> Just a quick correction and apologies, the actual issue is that http > will not work, https will so I dont think this is a bug as such I > think this is by design likely for security. > > > Looking at the man page for qemu-kvm it states http will work with > examples given however only https works, my best guess from looking > at the spec file from the srpm is that it has only been enabled in > the centos qemu-kvm-ev with https: Yes, the qemu RPMs in centos & RHEL have disabled support for http:// protocol, however, I expect that to immediately fail when trying to start the guest. eg # /usr/libexec/qemu-kvm -drive file=http://example.com/foo/bar -accel tcg qemu-kvm: -drive file=http://example.com/foo/bar: Driver 'http' is not whitelisted so I'm puzzelled why your guest successfully started at all with a http protocol in use. Are you able to share your QEMU log from /var/log/libvirt/qemu/$GUESTNAME.log from a VM that fails to launch with http ? Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :|
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