Virtual machine not powering on in Citrix XenServer 6.2
Today I connected to a CentOS 6 server via SSH and quickly noticed that the file system was in read only mode, after checking a few other Linux servers on the same XenServer host it quickly became...
View ArticleFix a CloudStack instance stuck in an incorrect state
In Apache CloudStack it is possible for the database to become out of sync with what is actually happening. For instance if there is a network issue preventing CloudStack from correctly connecting to...
View ArticleXenServer Virtual Machines Stop or Pause During Migration
Recently I had a whole lot of problems migrating virtual machines running on XenServer 6.2 and 6.0.2. Sometimes the migration would fail and the virtual machine would stop or pause resulting in down...
View ArticleFixing Blue Screen in Windows after XenServer Tools Update
I had a Windows Server 2008 R2 virtual machine running on XenServer 6.2 SP1 with all updates and patches applied, however it was still running an older version of XenServer tools. The tools were...
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Can’t boot ISO as HVM in Apache CloudStack
Recently while trying to boot from an ISO in Apache CloudStack I received the error “Unable to start instance ‘hostname’ (UUID), see management server log for details”. The ISO media did not support...
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Virtual machine fails to power on in Citrix XenServer
After rebooting a virtual machine running CentOS through Apache CloudStack it appeared to be running, however it failed to boot up. The status through CloudStack showed the virtual machine as running,...
View ArticleFree up disk space in Citrix XenServer
A Citrix XenServer dom0 currently runs with a 4GB root partition which is pretty small by today’s standards. A small amount of usable storage space can be quite easy to quickly fill. It is therefore...
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How to remove pending updates in Citrix XenServer
A few weeks ago I accidentally attempted to apply a XenServer hotfix intended for XenServer 6.2 to a host running XenServer 6.5. Ever since this accidental mistake, XenCenter has been reporting that...
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XenServer Tools Removed by Windows Update
After performing a regular Windows update and restart recently I found that XenServer tools appeared to have been removed. After trying to reinstall the tools I found that the process would hang...
View ArticleEdit the XenServer Storage Heartbeat
A Citrix XenServer host that is managed by Apache CloudStack will reboot itself along with all running virtual machines running on the host if there is a problem with the primary storage after a period...
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