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Qemu can not parse long fqdns during drive-mirror
During migration of an openstack booted instance, I got the following error:
Apr 12 10:55:22 cmp1 libvirtd[4133]: 2018-04-12 10:55:22.133+0000: 4139: error : qemuMonitorJSONCheckError:392 : internal error: unable to execute QEMU command 'drive-mirror': error parsing address 'cmp0.sandriichenko-deploy-heat-virtual-mcp-pike-ovs-76.bud-mk.local:49153'
A bit more info in libvirt bug https://bugzilla.redhat.com/show_bug.cgi?id=1568939
To reproduce it with qemu only, I followed the guide at https://github.com/qemu/qemu/blob/master/docs/interop/live-block-operations.rst#id21. On dest and source compute nodes, I launched an instance:
qemu-system-x86_64 -display none -nodefconfig -M q35 -nodefaults -m 512 -blockdev node-name=node-TargetDisk,driver=qcow2,file.driver=file,file.node-name=file,file.filename=./test-instance-mirror.qcow2 -device virtio-blk,drive=node-TargetDisk,id=virtio0 -S -monitor stdio -qmp unix:./qmp-sock,server,nowait -incoming tcp:localhost:6666
Then on dest node I launched nbd server:
(qemu) nbd_server_start cmp0:49153
(qemu) nbd_server_add -w node-TargetDisk
On the source node:
(qemu) drive_mirror -n node-TargetDisk nbd:cmp0.vdrok-deploy-heat-virtual-mcp-pike-ovs-foobarbuzz.bud-mk.local:49153:exportname=node-TargetDisk
error parsing address 'cmp0.vdrok-deploy-heat-virtual-mcp-pike-ovs-foobarbuzz.bud-mk.local:49153'
When using short host name instead of FQDN address seems to be parsed fine:
(qemu) drive_mirror -n node-TargetDisk nbd:cmp0:49153:exportname=node-TargetDisk qcow2
Image is not in qcow2 format
(not sure why it is not a qcow2 format, as I have qcow2 image with raw backing file, but this is unrelated)
QEMU version is 2.11.1 from bionic
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