CloudStack集成KVM报NFS错误

问题描述：

Cloudstack4.0集成KVM，可以正常添加主机，并且可以正常操作到ZONE启用，但是到系统VM启动的时候就开始报错，报异常。

`/mnt/xx': Invalid argument

Cloudstack Management:

/var/log/cloud/management/management-server.log

2013-08-14 03:09:09,161 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Skip capacity scan due to there is no Primary Storage UPintenance mode

1993 2013-08-14 03:09:09,721 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 routers.

1994 2013-08-14 03:09:25,572 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) VmStatsCollector is running...

1995 2013-08-14 03:09:25,587 DEBUG [cloud.server.StatsCollector] (StatsCollector-3:null) StorageCollector is running...

1996 2013-08-14 03:09:25,589 DEBUG [cloud.server.StatsCollector] (StatsCollector-1:null) HostStatsCollector is running...

1997 2013-08-14 03:09:39,160 DEBUG [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Skip capacity scan due to there is no Primary Storage UPintenance mode

1998 2013-08-14 03:09:39,721 DEBUG [network.router.VirtualNetworkApplianceManagerImpl] (RouterStatusMonitor-1:null) Found 0 routers

2013-08-13 15:28:01,634 WARN [cloud.consoleproxy.ConsoleProxyManagerImpl] (consoleproxy-1:null) Exception while trying to start console proxy

9023 com.cloud.exception.AgentUnavailableException: Resource [Host:1] is unreachable: Host 1: Unable to start instance due to Unable to get answer that is of class com.cloud.agent.api.Star        tAnswer

9024 at com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:847)

9025 at com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:472)

9026 at com.cloud.vm.VirtualMachineManagerImpl.start(VirtualMachineManagerImpl.java:465)

9027 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.startProxy(ConsoleProxyManagerImpl.java:627)

9028 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.allocCapacity(ConsoleProxyManagerImpl.java:1164)

9029 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:1981)

9030 at com.cloud.consoleproxy.ConsoleProxyManagerImpl.expandPool(ConsoleProxyManagerImpl.java:173)

9031 at com.cloud.vm.SystemVmLoadScanner.loadScan(SystemVmLoadScanner.java:113)

9032 at com.cloud.vm.SystemVmLoadScanner.access$100(SystemVmLoadScanner.java:34)

9033 at com.cloud.vm.SystemVmLoadScanner$1.reallyRun(SystemVmLoadScanner.java:83)

9034 at com.cloud.vm.SystemVmLoadScanner$1.run(SystemVmLoadScanner.java:73)

9035 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

9036 at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)

9037 at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)

9038         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)

9039         at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)

9040 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

9041 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

9042 at java.lang.Thread.run(Thread.java:679)

9043 Caused by: com.cloud.utils.exception.CloudRuntimeException: Unable to get answer that is of class com.cloud.agent.api.StartAnswer

9044 at com.cloud.agent.manager.Commands.getAnswer(Commands.java:80)

9045 at com.cloud.vm.VirtualMachineManagerImpl.advanceStart(VirtualMachineManagerImpl.java:783)

9046 ... 19 more

KVM Host(Cloudstack Aent)：

/var/log/cloud/agent/agent.log

com.cloud.utils.exception.CloudRuntimeException: org.libvirt.LibvirtException: cannot create path '/mnt/2c65613e-e5a3-3443-96c9-272fd60502ee/v-2-VM-patchdisk': Invalid argument

at com.cloud.hypervisor.kvm.storage.LibvirtStorageAdaptor.createPhysicalDisk(LibvirtStorageAdaptor.java:556)

at com.cloud.hypervisor.kvm.storage.LibvirtStoragePool.createPhysicalDisk(LibvirtStoragePool.java:101)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createPatchVbd(LibvirtComputingResource.java:2980)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.createVbd(LibvirtComputingResource.java:2943)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.execute(LibvirtComputingResource.java:2808)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1035)

at com.cloud.agent.Agent.processRequest(Agent.java:518)

at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:831)

at com.cloud.utils.nio.Task.run(Task.java:83)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)

at java.lang.Thread.run(Thread.java:679)

2013-08-13 17:41:17,886 WARN [cloud.agent.Agent] (agentRequest-Handler-2:null) Caught:

java.lang.NullPointerException

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.cleanupVMNetworks(LibvirtComputingResource.java:3922)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.handleVmStartFailure(LibvirtComputingResource.java:2709)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.execute(LibvirtComputingResource.java:2834)

at com.cloud.hypervisor.kvm.resource.LibvirtComputingResource.executeRequest(LibvirtComputingResource.java:1035)

at com.cloud.agent.Agent.processRequest(Agent.java:518)

at com.cloud.agent.Agent$AgentRequestHandler.doTask(Agent.java:831)

问题分析：

这个问题的原因从CloudStack日志文件里面很难找出如何解决该问题的出口，这个问题从上面的日志分析，不管是从Cloudstack管理节点还是安装代理软件的KVM节点，问题大概出现在主存储上面，但是又并不是权限的问题。

查看存储节点NFS的配置文件：

[root@storage252 ~]# cat /etc/exports

/primary *(rw,async,no_root_squash)

/secondary *(rw,async,no_root_squash)

[root@storage252 ~]# ll /primary/ /secondary/ -d

drwxrwxrwx 3 root root 4096 Aug 14 09:09 /primary/

drwxrwxrwx 3 root root 4096 Aug 13 18:33 /secondary/

[root@storage252 ~]# service nfs status

rpc.svcgssd is stopped

rpc.mountd (pid 26157) is running...

nfsd (pid 26222 26221 26220 26219 26218 26217 26216 26215) is running...

rpc.rquotad (pid 26153) is running...

[root@storage252 ~]# exportfs

/primary <world>

/secondary <world>

可以看出NFS服务器的配置文件跟导出的目录均没有问题。

手动挂载NFS导出的目录到KVM 主机上

[root@kvm01 ~]# showmount -e 192.168.150.252

Export list for 192.168.150.252:

/secondary *

/primary *

[root@kvm01 ~]# mkdir /mnt/1

[root@kvm01 ~]# mkdir /mnt/2

[root@kvm01 ~]# mount -t nfs 192.168.150.252:/primary /mnt/1

[root@kvm01 ~]# mount -t nfs 192.168.150.252:/secondary /mnt/2

[root@kvm01 ~]# ll /mnt/

total 8

drwxrwxrwx. 3 nobody nobody 4096 Aug 14 09:09 1

drwxrwxrwx. 3 nobody nobody 4096 Aug 13 18:33 2

创建目录查看权限是否没有限制

[root@kvm01 ~]# touch /mnt/1/test1

[root@kvm01 ~]# touch /mnt/2/test1

[root@kvm01 ~]# ll /mnt/1/

total 1

-rw-r--r--. 1 nobody nobody 0 Aug 14 09:35 test1

[root@kvm01 ~]# ll /mnt/2/

total 1

-rw-r--r--. 1 nobody nobody 0 Aug 14 09:35 test1

可以看出KVM主机对主存储跟二级存储目录均有可写权限。而且日志中也没有显示Operation xxx的报错。

但是可以发现挂载到KVM 主机上面的NFS目录的属主跟属组都是nobody,而我们在NFS服务器上面设置了no_root_squash参数，表明客户端使用root用户创建的文件的权限也应该是root.root，而非nobody.nobody。

从而去查看两个节点的系统日志文件，/var/log/message

Cloudstack Management:

Aug 13 16:50:25 storage252 rpc.idmapd[19778]: nss_getpwnam: name '0' does not map into domain 'clovem.com'

Aug 13 16:50:25 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

Aug 13 16:55:54 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

Aug 13 17:00:56 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

Aug 13 17:06:24 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

Aug 13 17:11:54 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

Aug 13 17:17:24 storage252 rpc.idmapd[19778]: nss_getpwnam: name 'root@sjcloud.cn' does not map into domain 'clovem.com'

KVM Host(Cloudstack Aent)：

Aug 13 15:23:35 kvm01 kernel: FS-Cache: Netfs 'nfs' registered for caching

2333 Aug 13 15:23:35 kvm01 nfsidmap[13080]: nss_getpwnam: name 'root@clovem.com' does not map into domain 'sjcloud.cn'

2334 Aug 13 15:26:48 kvm01 kernel: NFS: v4 server 192.168.150.252 does not accept raw uid/gids. Reenabling the idmapper.

2335 Aug 13 15:37:22 kvm01 kernel: lo: Disabled Privacy Extensions

2336 Aug 13 15:40:33 kvm01 gnome-session[17824]: WARNING: GSIdleMonitor: IDLETIME counter not found

2337 Aug 13 15:40:33 kvm01 gnome-session[17824]: WARNING: Unable to determine session: Unable to lookup session information

for process '17824'

问题解决

从上面的分析可以看出，问题出在两个节点的域不一样，导致在进行NFS映射的时候出现了问题。

查看两个节点的主机名：

[root@storage252 ~]# hostname --fqdn

storage252.clovem.com

[root@kvm01 ~]# hostname --fqdn

kvm01.sjcloud.cn

将两个节点的域进行统一即可。

但是如果仅仅是玩NFS，跟Cloudstack无关的话，可以通过

[root@kvm01 ~]# mount -t nfs -o vers=3 ip:/dir /localdir 即可

今天找到了最方面的解决方法：

在服务端/etc/exports文件下，指定导出目录的参数添加一个fsid=0参数即可

如：

/export_dir *(rw,fsid=1,async,no_root_squash)

/export_dir *(rw,fsid=2,async,no_root_squash)

本文转自暗黑魔君 51CTO博客，原文链接：http://blog.51cto.com/clovemfong/1272798，如需转载请自行联系原作者

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