在群里，有朋友问到，使用kvm的主机，迁移VM失败。在迁移的时候UI上选择迁移主机的时候提示（not suitable），迁移操作后的报错log如下：
log 写道
2013-05-10 12:21:12,906 DEBUG [agent.transport.Request] (StatsCollector-1:null) Seq 12-1822163042: Received: { Ans: , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 10, { GetStorageStatsAnswer } }
DEBUG [cloud.async.AsyncJobManagerImpl] (catalina-exec-23:null) submit async job-110, details: AsyncJobVO {id:110, userId: 2, accountId: 2, sessionKey: null, instanceType: None, instanceId: null, cmd: com.cloud.api.commands.MigrateVMCmd, cmdOriginator: null, cmdInfo: {"response":"json","sessionkey":"+UUFHn2vEgL8D23672YRc8DKh6s\u003d","virtualmachineid":"577fecb0-5e1a-4d8e-a986-e9b5ff482a41","hostid":"837fc7af-4c52-4945-a85a-a1e581241eeb","ctxUserId":"2","_":"1368159672367","ctxAccountId":"2","ctxStartEventId":"370"}, cmdVersion: 0, callbackType: 0, callbackAddress: null, status: 0, processStatus: 0, resultCode: 0, result: null, initMsid: 165160840324569, completeMsid: null, lastUpdated: null, lastPolled: null, created: null}
2013-05-10 12:21:13,531 DEBUG [cloud.async.AsyncJobManagerImpl] (Job-Executor-71:job-110) Executing com.cloud.api.commands.MigrateVMCmd for job-110
2013-05-10 12:21:13,556 INFO [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Migrating VM[User|kvmtest1] to Dest[Zone(Id)-Pod(Id)-Cluster(Id)-Host(Id)-Storage(Volume(Id|Type-->Pool(Id))] : Dest[Zone(1)-Pod(1)-Cluster(1)-Host(12)-Storage()]
2013-05-10 12:21:13,576 DEBUG [cloud.storage.StorageManagerImpl] (Job-Executor-71:job-110) Preparing 1 volumes for VM[User|kvmtest1]
2013-05-10 12:21:13,594 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163043: Sending { Cmd , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 100111, [{"PrepareForMigrationCommand":{"vm":{"id":7,"name":"i-2-7-VM","type":"User","cpus":2,"speed":2,"minRam":4294967296,"maxRam":4294967296,"arch":"x86_64","os":"CentOS 6.0 (64-bit)","bootArgs":"","rebootOnCrash":false,"enableHA":true,"limitCpuUse":false,"vncPassword":"45f1e9bf5d1cdaa8","params":{},"uuid":"577fecb0-5e1a-4d8e-a986-e9b5ff482a41","disks":[{"id":6,"name":"ROOT-7","mountPoint":"/primary","path":"173f67f8-45ad-4af7-899f-0d8a8597b73c","size":5368709120,"type":"ROOT","storagePoolType":"NetworkFilesystem","storagePoolUuid":"df6510f2-e971-3713-8fdd-aa6c5fe8d72c","deviceId":0},{"id":7,"path":"nfs://10.1.111.150condary/template/tmpl/2/203//203-2-6cee0418-f55e-37cc-88ba-aae74dd8b3f5.iso","size":0,"type":"ISO","storagePoolType":"ISO","deviceId":0}],"nics":[{"deviceId":0,"networkRateMbps":200,"defaultNic":true,"uuid":"976fab39-6b0e-44e9-868d-8b495a33b68b","ip":"10.1.111.185","netmask":"255.255.255.0","gateway":"10.1.111.254","mac":"06:1a:5a:00:00:19","dns1":"8.8.8.8","dns2":"8.8.4.4","broadcastType":"Vlan","type":"Guest","broadcastUri":"vlan://untagged","isolationUri":"ec2://untagged","isSecurityGroupEnabled":false}]},"wait":0}}] }
2013-05-10 12:21:13,843 DEBUG [agent.transport.Request] (AgentManager-Handler-7:null) Seq 12-1822163043: Processing: { Ans: , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 110, [{"PrepareForMigrationAnswer":{"result":true,"wait":0}}] }
2013-05-10 12:21:13,843 DEBUG [agent.manager.AgentAttache] (AgentManager-Handler-7:null) Seq 12-1822163043: No more commands found
2013-05-10 12:21:13,844 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163043: Received: { Ans: , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 110, { PrepareForMigrationAnswer } }
2013-05-10 12:21:13,850 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) VM state transitted from :Running to Migrating with event: MigrationRequestedvm's original host id: 1 new host id: 12 host id before state transition: 1
DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Hosts's actual total CPU: 45624 and CPU after applying overprovisioning: 45624
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) We are allocating VM, increasing the used capacity of this host:12
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Current Used CPU: 0 , Free CPU:45624 ,Requested CPU: 4
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Current Used RAM: 0 , Free RAM:33609699328 ,Requested RAM: 4294967296
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) CPU STATS after allocation: for host: 12, old used: 0, old reserved: 0, actual total: 45624, total with overprovisioning: 45624; new used:4, reserved:0; requested cpu:4,alloc_from_last:false
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) RAM STATS after allocation: for host: 12, old used: 0, old reserved: 0, total: 33609699328; new used: 4294967296, reserved: 0; requested mem: 4294967296,alloc_from_last:false
2013-05-10 12:21:13,862 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 1-1874334912: Sending { Cmd , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 100111, [{"MigrateCommand":{"vmName":"i-2-7-VM","destIp":"10.1.111.151","hostGuid":"b8da45b7-63d4-34ad-83fe-4868eef53e7c-LibvirtComputingResource","isWindows":false,"wait":0}}] }
2013-05-10 12:21:13,917 DEBUG [agent.transport.Request] (AgentManager-Handler-1:null) Seq 1-1874334912: Processing: { Ans: , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 110, [{"MigrateAnswer":{"result":false,"details":"internal error Attempt to migrate guest to the same host 00020003-0004-0005-0006-000700080009","wait":0}}] }
2013-05-10 12:21:13,917 DEBUG [agent.manager.AgentAttache] (AgentManager-Handler-1:null) Seq 1-1874334912: No more commands found
2013-05-10 12:21:13,917 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 1-1874334912: Received: { Ans: , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 110, { MigrateAnswer } }
2013-05-10 12:21:13,917 ERROR [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Unable to migrate due to internal error Attempt to migrate guest to the same host 00020003-0004-0005-0006-000700080009
2013-05-10 12:21:13,917 INFO [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Migration was unsuccessful. Cleaning up: VM[User|kvmtest1]
2013-05-10 12:21:13,919 DEBUG [cloud.alert.AlertManagerImpl] (Job-Executor-71:job-110) Have already sent: 1 emails for alert type '16' -- skipping send email
2013-05-10 12:21:13,921 DEBUG [agent.manager.AgentAttache] (Job-Executor-71:job-110) Seq 12-1822163044: Routed from 165160840324569
2013-05-10 12:21:13,921 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163044: Sending { Cmd , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 100111, [{"StopCommand":{"isProxy":false,"vmName":"i-2-7-VM","wait":0}}] }
2013-05-10 12:21:13,925 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) VM state transitted from :Migrating to Running with event: OperationFailedvm's original host id: 1 new host id: 1 host id before state transition: 12
2013-05-10 12:21:13,929 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Hosts's actual total CPU: 45624 and CPU after applying overprovisioning: 45624
2013-05-10 12:21:13,930 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) release cpu from host: 12, old used: 4,reserved: 0, actual total: 45624, total with overprovisioning: 45624; new used: 0,reserved:0; movedfromreserved: false,moveToReserveredfalse
2013-05-10 12:21:13,930 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) release mem from host: 12, old used: 4294967296,reserved: 0, total: 33609699328; new used: 0,reserved:0; movedfromreserved: false,moveToReserveredfalse
2013-05-10 12:21:13,939 WARN [cloud.api.ApiDispatcher] (Job-Executor-71:job-110) class com.cloud.api.ServerApiException : Failed to migrate vm
DEBUG [cloud.async.AsyncJobManagerImpl] (catalina-exec-23:null) submit async job-110, details: AsyncJobVO {id:110, userId: 2, accountId: 2, sessionKey: null, instanceType: None, instanceId: null, cmd: com.cloud.api.commands.MigrateVMCmd, cmdOriginator: null, cmdInfo: {"response":"json","sessionkey":"+UUFHn2vEgL8D23672YRc8DKh6s\u003d","virtualmachineid":"577fecb0-5e1a-4d8e-a986-e9b5ff482a41","hostid":"837fc7af-4c52-4945-a85a-a1e581241eeb","ctxUserId":"2","_":"1368159672367","ctxAccountId":"2","ctxStartEventId":"370"}, cmdVersion: 0, callbackType: 0, callbackAddress: null, status: 0, processStatus: 0, resultCode: 0, result: null, initMsid: 165160840324569, completeMsid: null, lastUpdated: null, lastPolled: null, created: null}
2013-05-10 12:21:13,531 DEBUG [cloud.async.AsyncJobManagerImpl] (Job-Executor-71:job-110) Executing com.cloud.api.commands.MigrateVMCmd for job-110
2013-05-10 12:21:13,556 INFO [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Migrating VM[User|kvmtest1] to Dest[Zone(Id)-Pod(Id)-Cluster(Id)-Host(Id)-Storage(Volume(Id|Type-->Pool(Id))] : Dest[Zone(1)-Pod(1)-Cluster(1)-Host(12)-Storage()]
2013-05-10 12:21:13,576 DEBUG [cloud.storage.StorageManagerImpl] (Job-Executor-71:job-110) Preparing 1 volumes for VM[User|kvmtest1]
2013-05-10 12:21:13,594 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163043: Sending { Cmd , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 100111, [{"PrepareForMigrationCommand":{"vm":{"id":7,"name":"i-2-7-VM","type":"User","cpus":2,"speed":2,"minRam":4294967296,"maxRam":4294967296,"arch":"x86_64","os":"CentOS 6.0 (64-bit)","bootArgs":"","rebootOnCrash":false,"enableHA":true,"limitCpuUse":false,"vncPassword":"45f1e9bf5d1cdaa8","params":{},"uuid":"577fecb0-5e1a-4d8e-a986-e9b5ff482a41","disks":[{"id":6,"name":"ROOT-7","mountPoint":"/primary","path":"173f67f8-45ad-4af7-899f-0d8a8597b73c","size":5368709120,"type":"ROOT","storagePoolType":"NetworkFilesystem","storagePoolUuid":"df6510f2-e971-3713-8fdd-aa6c5fe8d72c","deviceId":0},{"id":7,"path":"nfs://10.1.111.150condary/template/tmpl/2/203//203-2-6cee0418-f55e-37cc-88ba-aae74dd8b3f5.iso","size":0,"type":"ISO","storagePoolType":"ISO","deviceId":0}],"nics":[{"deviceId":0,"networkRateMbps":200,"defaultNic":true,"uuid":"976fab39-6b0e-44e9-868d-8b495a33b68b","ip":"10.1.111.185","netmask":"255.255.255.0","gateway":"10.1.111.254","mac":"06:1a:5a:00:00:19","dns1":"8.8.8.8","dns2":"8.8.4.4","broadcastType":"Vlan","type":"Guest","broadcastUri":"vlan://untagged","isolationUri":"ec2://untagged","isSecurityGroupEnabled":false}]},"wait":0}}] }
2013-05-10 12:21:13,843 DEBUG [agent.transport.Request] (AgentManager-Handler-7:null) Seq 12-1822163043: Processing: { Ans: , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 110, [{"PrepareForMigrationAnswer":{"result":true,"wait":0}}] }
2013-05-10 12:21:13,843 DEBUG [agent.manager.AgentAttache] (AgentManager-Handler-7:null) Seq 12-1822163043: No more commands found
2013-05-10 12:21:13,844 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163043: Received: { Ans: , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 110, { PrepareForMigrationAnswer } }
2013-05-10 12:21:13,850 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) VM state transitted from :Running to Migrating with event: MigrationRequestedvm's original host id: 1 new host id: 12 host id before state transition: 1
DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Hosts's actual total CPU: 45624 and CPU after applying overprovisioning: 45624
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) We are allocating VM, increasing the used capacity of this host:12
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Current Used CPU: 0 , Free CPU:45624 ,Requested CPU: 4
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Current Used RAM: 0 , Free RAM:33609699328 ,Requested RAM: 4294967296
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) CPU STATS after allocation: for host: 12, old used: 0, old reserved: 0, actual total: 45624, total with overprovisioning: 45624; new used:4, reserved:0; requested cpu:4,alloc_from_last:false
2013-05-10 12:21:13,856 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) RAM STATS after allocation: for host: 12, old used: 0, old reserved: 0, total: 33609699328; new used: 4294967296, reserved: 0; requested mem: 4294967296,alloc_from_last:false
2013-05-10 12:21:13,862 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 1-1874334912: Sending { Cmd , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 100111, [{"MigrateCommand":{"vmName":"i-2-7-VM","destIp":"10.1.111.151","hostGuid":"b8da45b7-63d4-34ad-83fe-4868eef53e7c-LibvirtComputingResource","isWindows":false,"wait":0}}] }
2013-05-10 12:21:13,917 DEBUG [agent.transport.Request] (AgentManager-Handler-1:null) Seq 1-1874334912: Processing: { Ans: , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 110, [{"MigrateAnswer":{"result":false,"details":"internal error Attempt to migrate guest to the same host 00020003-0004-0005-0006-000700080009","wait":0}}] }
2013-05-10 12:21:13,917 DEBUG [agent.manager.AgentAttache] (AgentManager-Handler-1:null) Seq 1-1874334912: No more commands found
2013-05-10 12:21:13,917 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 1-1874334912: Received: { Ans: , MgmtId: 165160840324569, via: 1, Ver: v1, Flags: 110, { MigrateAnswer } }
2013-05-10 12:21:13,917 ERROR [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Unable to migrate due to internal error Attempt to migrate guest to the same host 00020003-0004-0005-0006-000700080009
2013-05-10 12:21:13,917 INFO [cloud.vm.VirtualMachineManagerImpl] (Job-Executor-71:job-110) Migration was unsuccessful. Cleaning up: VM[User|kvmtest1]
2013-05-10 12:21:13,919 DEBUG [cloud.alert.AlertManagerImpl] (Job-Executor-71:job-110) Have already sent: 1 emails for alert type '16' -- skipping send email
2013-05-10 12:21:13,921 DEBUG [agent.manager.AgentAttache] (Job-Executor-71:job-110) Seq 12-1822163044: Routed from 165160840324569
2013-05-10 12:21:13,921 DEBUG [agent.transport.Request] (Job-Executor-71:job-110) Seq 12-1822163044: Sending { Cmd , MgmtId: 165160840324569, via: 12, Ver: v1, Flags: 100111, [{"StopCommand":{"isProxy":false,"vmName":"i-2-7-VM","wait":0}}] }
2013-05-10 12:21:13,925 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) VM state transitted from :Migrating to Running with event: OperationFailedvm's original host id: 1 new host id: 1 host id before state transition: 12
2013-05-10 12:21:13,929 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) Hosts's actual total CPU: 45624 and CPU after applying overprovisioning: 45624
2013-05-10 12:21:13,930 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) release cpu from host: 12, old used: 4,reserved: 0, actual total: 45624, total with overprovisioning: 45624; new used: 0,reserved:0; movedfromreserved: false,moveToReserveredfalse
2013-05-10 12:21:13,930 DEBUG [cloud.capacity.CapacityManagerImpl] (Job-Executor-71:job-110) release mem from host: 12, old used: 4294967296,reserved: 0, total: 33609699328; new used: 0,reserved:0; movedfromreserved: false,moveToReserveredfalse
2013-05-10 12:21:13,939 WARN [cloud.api.ApiDispatcher] (Job-Executor-71:job-110) class com.cloud.api.ServerApiException : Failed to migrate vm
上边加粗的地方就是失败的原因。是KVM中libvirt的uuid出的问题。 解决方法如下：
#uuidgen //获取一个uuid #vi /etc/libvirt/libvirtd.conf //编辑配置文件 host_uuid = “00000000-0000-0000-0000-000000000000″ //将之前获取的uuid填在这里。 #service libvirtd restart //重启服务 应该就可以在线迁移了。
如果还有问题，可以尝试重启CloudStack的 KVM agent，或KVM所在的主机。
参考文档：
http://vaunaspada.babel.it/blog/?p=613
http://bbs.linuxtone.org/thread-22673-1-1.html