工作中经常用到CloudStack，过程中发现的一些故障排查分享出来，希望可以帮到大家。

一、添加主机失败

现象1：

[root@mgmt ~]# tail -f /var/log/cloudstack/management/management-server.log
2014-02-28 11:05:32,172 DEBUG [kvm.discoverer.LibvirtServerDiscoverer] (catalina-exec-22:null) Timeout, to wait for the host connecting to mgt svr, assuming it is failed
2014-02-28 11:05:32,205 WARN [cloud.resource.ResourceManagerImpl] (catalina-exec-22:null) Unable to find the server resources at http://192.168.150.250
2014-02-28 11:05:32,220 INFO [utils.exception.CSExceptionErrorCode] (catalina-exec-22:null) Could not find exception: com.cloud.exception.DiscoveryException in error code list for exceptions
2014-02-28 11:05:32,220 WARN [admin.host.AddHostCmd] (catalina-exec-22:null) Exception:
com.cloud.exception.DiscoveryException: Unable to add the host
 at com.cloud.resource.ResourceManagerImpl.discoverHostsFull(ResourceManagerImpl.java:798)
 at com.cloud.resource.ResourceManagerImpl.discoverHosts(ResourceManagerImpl.java:590)
 at org.apache.cloudstack.api.command.admin.host.AddHostCmd.execute(AddHostCmd.java:143)
 at com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:158)
 at com.cloud.api.ApiServer.queueCommand(ApiServer.java:514)
 at com.cloud.api.ApiServer.handleRequest(ApiServer.java:372)
 at com.cloud.api.ApiServlet.proce***equest(ApiServlet.java:305)
 at com.cloud.api.ApiServlet.doPost(ApiServlet.java:71)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:555)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
 at org.apache.coyote.http11.Http11NioProcessor.process(Http11NioProcessor.java:889)
 at org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:721)
 at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:2268)
 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)
2014-02-28 11:05:32,222 INFO [cloud.api.ApiServer] (catalina-exec-22:null) Unable to add the host
2014-02-28 11:05:32,224 DEBUG [cloud.api.ApiServlet] (catalina-exec-22:null) ===END=== 192.168.151.234 -- POST command=addHost&response=json&sessionkey=GEI3EIOONoV5RG9Mcs4xcdx31oc%3D

现象2：

[root@kvm01 agent]# /etc/init.d/cloudstack-agent status    ##查看kvm主机的cloudstack-agent服务状态
cloudstack-agent dead but subsys locked


现象3：

[root@kvm01 agent]# cat /var/log/cloudstack/agent/agent.log        ##查看kvm主机的agent.log日志中的异常
ERROR [cloud.agent.AgentShell] (main:null) Unable to start agent: NO HVM support on this machine, please make sure: 1. VT/SVM is supported by your CPU, or is enabled in BIOS. 2. kvm modules are loaded (kvm, kvm_amd|kvm_intel)


解决方法：

1.必须安装虚拟化套件支持 
[root@kvm01 agent]# yum -y groupinstall 'Virtualization' 'Virtualization Client' 'Virtualzation Platform' 'Virtualization Tools'
2.确认kvm模块已经被正确加载 
[root@kvm01 ~]# lsmod | grep kvm
kvm_intel 52570 0
kvm 314739 1 kvm_intel
如果没有任何信息，请使用如下命令加载kvm模块： 
[root@kvm01 ~]# modprobe kvm_intel     ##intel平台
[root@kvm01 ~]# modprobe kvm_amd       ##amd平台

3.再次添加。


福利：

关于添加主机过程中的错误，千奇百怪，而java的报错又。。。教给大家一个小技巧：

当添加主机报错，日志中有没有明确原因时，可以手动在agent上面执行添加主机的命令。具体添加主机的命令可以在management的日志中获得：

[root@localhost management]# cat /var/log/cloudstack/management/management-server.log | grep cloudstack-setup-agent
2014-03-13 09:56:17,758 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-11:null) Executing cmd: cloudstack-setup-agent  -m 192.168.153.28 -z 2 -p 2 -c 2 -g 0d21492f-9565-329d-9a26-0c85f6d39d12 -a --pubNic=cloud0 --prvNic=cloud0 --guestNic=cloud0
2014-03-13 09:56:52,775 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-11:null) cloudstack-setup-agent  -m 192.168.153.28 -z 2 -p 2 -c 2 -g 0d21492f-9565-329d-9a26-0c85f6d39d12 -a --pubNic=cloud0 --prvNic=cloud0 --guestNic=cloud0 output:CloudStack Agent setup is done!
2014-03-13 11:12:22,455 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-12:null) Executing cmd: cloudstack-setup-agent  -m 192.168.153.28 -z 3 -p 3 -c 3 -g 0d21492f-9565-329d-9a26-0c85f6d39d12 -a --pubNic=cloud0 --prvNic=cloud0 --guestNic=cloud0
2014-03-13 11:12:57,267 DEBUG [utils.ssh.SSHCmdHelper] (catalina-exec-12:null) cloudstack-setup-agent  -m 192.168.153.28 -z 3 -p 3 -c 3 -g 0d21492f-9565-329d-9a26-0c85f6d39d12 -a --pubNic=cloud0 --prvNic=cloud0 --guestNic=cloud0 output:CloudStack Agent setup is done!

比如我上面的例子,得到如下命令，并在agent上面执行：

[root@kvm01 ~]# cloudstack-setup-agent  -m 192.168.153.28 -z 3 -p 3 -c 3 -g 0d21492f-9565-329d-9a26-0c85f6d39d12 -a --pubNic=cloud0 --prvNic=cloud0 --guestNic=cloud0
Starting to configure your system:
Configure Cgroup ...          [OK]
Configure SElinux ...         [OK]
Configure Network ...         [OK]
Configure Libvirt ...         [OK]
Configure Firewall ...        [OK]
Configure Nfs ...             [OK]
Configure cloudAgent ...      [OK]
CloudStack Agent setup is done!
[root@kvm01 ~]#

这个过程中，如果报错，就很轻易就能判断出问题是出在哪一步。

另外，上面cloudstack-setup-agent命令的参数如下，根据自己的情况改写：

[root@dbserver ~]# cloudstack-setup-agent -h
Usage: cloudstack-setup-agent [options]
Options:
  -h, --help            show this help message and exit
  -a                    auto mode
  -m MGT, --host=MGT    Management server hostname or IP-Address
  -z ZONE, --zone=ZONE  zone id
  -p POD, --pod=POD     pod id
  -c CLUSTER, --cluster=CLUSTER
                        cluster id
  -g GUID, --guid=GUID  guid
  --pubNic=PUBNIC       Public traffic interface
  --prvNic=PRVNIC       Private traffic interface
  --guestNic=GUESTNIC   Guest traffic interface

至于参数后面具体的值，可以从agent主机的/etc/cloudstack/agent/agent.properties中获得：

[root@kvm01 ~]# cat /etc/cloudstack/agent/agent.properties
#Storage
#Thu Mar 13 11:23:48 CST 2014
guest.network.device=cloud0
workers=5
private.network.device=cloud0
port=8250
resource=com.cloud.hypervisor.kvm.resource.LibvirtComputingResource
pod=3
zone=3
guid=0d21492f-9565-329d-9a26-0c85f6d39d12
public.network.device=cloud0
cluster=3
local.storage.uuid=ac70655b-f452-4d14-a1a1-2a5eebc4bb01
domr.scripts.dir=scripts/network/domr/kvm
LibvirtComputingResource.id=0
host=192.168.153.28


持续更新中。。。