This is what I'm doing on my CentOS 7/KVM/virtlib server:

rbd create --size 20G pool/vm.mydomain.com

rbd map pool/vm.mydomain.com --name client.admin

virt-install --name vm.mydomain.com --ram 2048 --disk 
path=/dev/rbd/pool/vm.mydomain.com  --vcpus 1  --os-type linux --os-variant 
rhel6 --network bridge=dmz --graphics none --console pty,target_type=serial 
--location http://repo.mydomain.com/centos/7/os/x86_64 --extra-args 
"ip=en0:dhcp ks=http://repo.mydomain.com/ks/ks.cfg.vm console=ttyS0  
ksdevice=eth0 
inst.repo=http://10.0.10.5/http://repo.mydomain.com/centos/7/os/x86_64";

And then it creates partitions, filesystems (xfs), and
starts installing packages. 9 times out of 10 it hangs while
installing packages. And I have no idea why. I can't kill
the VM. 

Trying to destroy it shows:

virsh # destroy vm.mydomain.com
error: Failed to destroy domain vm.mydomain.com
error: Failed to terminate process 19629 with SIGKILL:
Device or resource busy

and then virsh ls shows:

virsh ls shows:

127   vm.mydomain.com        in shutdown

The log for this vm in
/var/log/libvirt/qemu/vm.mydomain.com contains only:

2017-02-06 08:14:12.256+0000: starting up libvirt version:
2.0.0, package: 10.el7_3.2 (CentOS BuildSystem
<http://bugs.centos.org>, 2016-12-06-19:53:38,
c1bm.rdu2.centos.org), qemu version: 1.5.3
(qemu-kvm-1.5.3-105.el7_2.7), hostname: cpu01.mydomain.com
LC_ALL=C
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
QEMU_AUDIO_DRV=none /usr/libexec/qemu-kvm -name
secclass2.mydomain.com -S -machine
pc-i440fx-rhel7.0.0,accel=kvm,usb=off -cpu
SandyBridge,+vme,+f16c,+rdrand,+fsgsbase,+smep,+erms -m
2048 -realtime mlock=off -smp 1,sockets=1,cores=1,threads=1
-uuid 5dadf01e-b996-411f-b95f-26ce6b790bae -nographic
-no-user-config -nodefaults -chardev
socket,id=charmonitor,path=/var/lib/libvirt/qemu/domain-127-secclass2.mydomain./monitor.sock,server,nowait
-mon chardev=charmonitor,id=monitor,mode=control -rtc
base=utc,driftfix=slew -global
kvm-pit.lost_tick_policy=discard -no-hpet -no-reboot
-global PIIX4_PM.disable_s3=1 -global PIIX4_PM.disable_s4=1
-boot strict=on -kernel
/var/lib/libvirt/boot/virtinst-vmlinuz.9Ax4zt -initrd
/var/lib/libvirt/boot/virtinst-initrd.img.ALJE43 -append
'ip=en0:dhcp ks=http://util1.mydomain.com/ks/ks.cfg.vm.
console=ttyS0  ksdevice=eth0
inst.repo=http://10.0.10.5/http://util1.mydomain.com/centos/7/os/x86_64
method=http://util1.mydomain.com/centos/7/os/x86_64'
-device ich9-usb-ehci1,id=usb,bus=pci.0,addr=0x5.0x7
-device
ich9-usb-uhci1,masterbus=usb.0,firstport=0,bus=pci.0,multifunction=on,addr=0x5
-device
ich9-usb-uhci2,masterbus=usb.0,firstport=2,bus=pci.0,addr=0x5.0x1
-device
ich9-usb-uhci3,masterbus=usb.0,firstport=4,bus=pci.0,addr=0x5.0x2
-device
virtio-serial-pci,id=virtio-serial0,bus=pci.0,addr=0x4
-drive
file=/dev/rbd/security-class/secclass2.mydomain.com,format=raw,if=none,id=drive-virtio-disk0,cache=none,aio=native
-device
virtio-blk-pci,scsi=off,bus=pci.0,addr=0x6,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1
-netdev tap,fd=55,id=hostnet0,vhost=on,vhostfd=57 -device
virtio-net-pci,netdev=hostnet0,id=net0,mac=52:54:00:87:d2:12,bus=pci.0,addr=0x3
-chardev pty,id=charserial0 -device
isa-serial,chardev=charserial0,id=serial0 -chardev
socket,id=charchannel0,path=/var/lib/libvirt/qemu/channel/target/domain-127-secclass2.mydomain./org.qemu.guest_agent.0,server,nowait
-device
virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=org.qemu.guest_agent.0
-device usb-tablet,id=input0,bus=usb.0,port=1 -device
virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x7 -msg
timestamp=on
char device redirected to /dev/pts/24 (label charserial0)
qemu: terminating on signal 15 from pid 23385

Any ideas? If this is a libvirt/kvm problem I'll take it to the
appropriate forum but we can install into iscsi LUNs with no problem at
all.

Someone on IRC mentioned mkfs discard starting a zero on the rbd image
which can take a long time but that should be doable in background and
not hang the whole VM forever, right?

Thanks for any insight you can provide!

-- 
Tracy Reed

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