cloudstack 的坑

最近一客户单位要启用16年的备用环境，cloudstack正常启动后，kvm虚拟机启动了两台，发现应用收到影响，于是将虚拟机关闭，等到再次启动虚拟机时发现，启动失败。控制台给出的错误是"Unable to start a VM due to insufficient capacity"。一下子懵逼了，这cloudstack是个老古董啊，梁胜早就干别的去了，现在流行容器化，这cloudstack也没人管了，以前我也没整过这个啊。只好求助baidu和Google，一轮搜索下来发现"Unable to start a VM due to insufficient capacity",这个错误是个表象，开启cloudstackmanagement日志的trace级别，和agent的trace基本日志，发现每次启动都是这个错误第一个出现。
2019-12-27 09:29:15,224 INFO  [c.c.v.VirtualMachineManagerImpl] (Work-Job-Executor-5:ctx-8cac4657 job-119455/job-119456 ctx-84437abc) (logid:ede314d7) Unable to contact resource.
com.cloud.exception.ResourceUnavailableException: Resource [Pod:1] is unreachable: Unable to apply userdata and password entry on router
        at org.apache.cloudstack.network.topology.BasicNetworkTopology.applyRules(BasicNetworkTopology.java:397)
        at org.apache.cloudstack.network.topology.BasicNetworkTopology.applyUserData(BasicNetworkTopology.java:185)
        at com.cloud.network.element.VirtualRouterElement.addPasswordAndUserdata(VirtualRouterElement.java:1015)
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepareElement(NetworkOrchestrator.java:1266)
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepareNic(NetworkOrchestrator.java:1385)
        at org.apache.cloudstack.engine.orchestration.NetworkOrchestrator.prepare(NetworkOrchestrator.java:1321)
        at com.cloud.vm.VirtualMachineManagerImpl.orchestrateStart(VirtualMachineManagerImpl.java:996)
        at com.cloud.vm.VirtualMachineManagerImpl.orchestrateStart(VirtualMachineManagerImpl.java:4580)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at com.cloud.vm.VmWorkJobHandlerProxy.handleVmWorkJob(VmWorkJobHandlerProxy.java:107)
        at com.cloud.vm.VirtualMachineManagerImpl.handleVmWorkJob(VirtualMachineManagerImpl.java:4741)
        at com.cloud.vm.VmWorkJobDispatcher.runJob(VmWorkJobDispatcher.java:102)
"nable to apply userdata and password entry on router",搜索这个错误，有很多说法，其中有人说把虚拟路由删除，再重设置一个就好了，这是粗处理，再搜索，找到这篇文章。“cloudstack 虚拟路由之痛”
https://selfsigned.wordpress.com/2014/06/27/cloudstack-virtual-router-pains/

作为虚拟路由的deban系统内/var/log日志占满了磁盘，导致这个问题，进入VR的控制台删除日志就好了。这坑埋得太深了。

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