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COLO unable to failover to secondary VM
I test COLO feature on my host following docs/COLO-FT.txt in qemu folder, but fail to failover to secondary VM.
Is there any mistake in my execution steps?
Execution environment:
QEMU v2.12.0-rc4
OS: Ubuntu 16.04.3 LTS
Kernel: Linux 4.4.35
Secondary VM IP: noted as "a.b.c.d"
Execution steps:
# Primary
${COLO_PATH}/x86_64-softmmu/qemu-system-x86_64 \
-enable-kvm \
-m 512M \
-smp 2 \
-qmp stdio \
-vnc :7 \
-name primary \
-device piix3-usb-uhci \
-device usb-tablet \
-netdev tap,id=tap0,vhost=off \
-device virtio-net-pci,id=net-pci0,netdev=tap0 \
-drive if=virtio,id=primary-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,\
children.0.file.filename=${IMG_PATH},\
children.0.driver=raw -S
# Secondary
${COLO_PATH}/x86_64-softmmu/qemu-system-x86_64 \
-enable-kvm \
-m 512M \
-smp 2 \
-qmp stdio \
-vnc :8 \
-name secondary \
-device piix3-usb-uhci \
-device usb-tablet \
-netdev tap,id=tap1,vhost=off \
-device virtio-net-pci,id=net-pci0,netdev=tap1 \
-drive if=none,id=secondary-disk0,file.filename=${IMG_PATH},driver=raw,node-name=node0 \
-drive if=virtio,id=active-disk0,driver=replication,mode=secondary,\
file.driver=qcow2,top-id=active-disk0,\
file.file.filename=$ACTIVE_DISK,\
file.backing.driver=qcow2,\
file.backing.file.filename=$HIDDEN_DISK,\
file.backing.backing=secondary-disk0 \
-incoming tcp:0:8888
# Enter into Secondary:
{'execute':'qmp_capabilities'}
{ 'execute': 'nbd-server-start',
'arguments': {'addr': {'type': 'inet', 'data': {'host': 'a.b.c.d', 'port': '8889'} } }
}
{'execute': 'nbd-server-add', 'arguments': {'device': 'secondary-disk0', 'writable': true } }
# Enter into Primary:
{'execute':'qmp_capabilities'}
{'execute': 'human-monitor-command',
'arguments': {
'command-line': 'drive_add -n buddy driver=replication,mode=primary,file.driver=nbd,file.host=a.b.c.d,file.port=8889,file.export=secondary-disk0,node-name=nbd_client0'
}
}
{ 'execute':'x-blockdev-change', 'arguments':{'parent': 'primary-disk0', 'node': 'nbd_client0' } }
{ 'execute': 'migrate-set-capabilities',
'arguments': {'capabilities': [ {'capability': 'x-colo', 'state': true } ] } }
{ 'execute': 'migrate', 'arguments': {'uri': 'tcp:a.b.c.d:8888' } }
# To test failover
Primary
{ 'execute': 'x-blockdev-change', 'arguments': {'parent': 'primary-disk0', 'child': 'children.1'}}
{ 'execute': 'human-monitor-command','arguments': {'command-line': 'drive_del nbd_client0'}}
Secondary
{ 'execute': 'nbd-server-stop' }
Stop Primary
Send ^C signal to terminate PVM.
Secondary
{ "execute": "x-colo-lost-heartbeat" }
# Result:
Primary (Use ^C to terminate)
qemu-system-x86_64: Can't receive COLO message: Input/output error
qemu-system-x86_64: terminating on signal 2
{"timestamp": {"seconds": 1531815575, "microseconds": 997696}, "event": "SHUTDOWN", "data": {"guest":false}}
Secondary
{ 'execute': 'nbd-server-stop' }
{"return": {}}
{ "execute": "x-colo-lost-heartbeat" }
{"return": {}}
qemu-system-x86_64: Can't receive COLO message: Input/output error
Segmentation fault
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