libvirt qemu/kvm 迁移问题

Question

我在戴尔服务器上使用 kvm 和 libvirt。现在我正在尝试将一台虚拟机从物理服务器迁移到另一台。然而，我每次都失败了。

在 physicalServer1 上的 virsh 中，我输入：

virsh # migrate virtualmachine1 qemu+ssh://username@physicalServer2/system
error: operation failed: migration to 'tcp:physicalServer2:49163' failed: migration failed

然后我在 libvirt.org 上搜索了FAQ 部分。它说：

error: operation failed: migration to '...' failed: migration failed

This is an error often encountered when trying to migrate with QEMU/KVM. This typically happens with plain migration, when the source VM cannot connect to the destination host. You will want to make sure your hosts are properly configured for migration (see the migration section of this FAQ)

我设法ssh physicalServer2从 virtualmachine1 上的 shell 中获得，所以上面的红色部分并没有解释我的失败。

我也在 physicalServer2 上打开端口，iptables -L显示以下信息：

Chain INPUT (policy ACCEPT)
target prot opt source destination
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT udp -- anywhere anywhere udp dpt:bootps
ACCEPT tcp -- anywhere anywhere tcp dpt:bootps
ACCEPT udp -- anywhere anywhere udp dpt:domain
ACCEPT tcp -- anywhere anywhere tcp dpt:domain
ACCEPT udp -- anywhere anywhere udp dpt:bootps
ACCEPT tcp -- anywhere anywhere tcp dpt:bootps
ACCEPT tcp -- anywhere anywhere state NEW tcp dpts:49152:49215


Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED
ACCEPT all -- 192.168.122.0/24 anywhere
ACCEPT all -- anywhere anywhere
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED
ACCEPT all -- 192.168.122.0/24 anywhere
ACCEPT all -- anywhere anywhere
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable
REJECT all -- anywhere anywhere reject-with icmp-port-unreachable


Chain OUTPUT (policy ACCEPT)
target prot opt source destination

physicalServer2 上的 /var/log/libvirt/qemu/virtualmachine1.log：

2011-05-06 13:37:30.708: starting up
LC_ALL=C PATH=/usr/local/sbin:/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin QEMU_AUDIO_DRV=none /usr/bin/kvm -S -M pc-0.14 -enable-kvm -m 2048 -smp 1,sockets=1,cores=1,threads=1 -name openjudge-test -uuid a8c704bc-a4f9-90db-3e57-40e60b00aac1 -nodefconfig -nodefaults -chardev socket,id=charmonitor,path=/var/lib/libvirt/qemu/virtualmachine1.monitor,server,nowait -mon chardev=charmonitor,id=monitor,mode=readline -rtc base=utc -boot c -drive file=/media/nfs/virtualmachine1.img,if=none,id=drive-ide0-0-0,format=raw -device ide-drive,bus=ide.0,unit=0,drive=drive-ide0-0-0,id=ide0-0-0 -drive if=none,media=cdrom,id=drive-ide0-1-0,readonly=on,format=raw -device ide-drive,bus=ide.1,unit=0,drive=drive-ide0-1-0,id=ide0-1-0 -netdev tap,fd=20,id=hostnet0 -device rtl8139,netdev=hostnet0,id=net0,mac=00:16:36:8a:22 :a0,bus=pci.0,addr=0x3 -chardev pty,id=charserial0 -device isa-serial,chardev=charserial0,id=serial0 -usb -vnc 127.0.0.1:2 -vga cirrus -incoming tcp:0.0.0.0:49163 -device virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x4
char device redirected to /dev/pts/0
2011-05-06 13:37:30.915: shutting down

physicalServer1 上的 /var/log/libvirt/qemu/virtualmachine1.log 是空的。

两台物理服务器都使用 Ubuntu 11.04。使用的 libvirt 和 kvm 由 apt-get 安装。libvirt 版本是 0.8.8。

Answer 1

确保在主机之间打开 TCP 49152-49261，并且在 DNS 或彼此的 /etc/hosts 文件中每个主机名。由于某种原因，KVM 迁移是根据主机名而不是 IP 地址进行的。