#Compute

Preface Core services may not running Two different host types No Shared volume No enough Quota Apparmor in place The source compute host swapped No valid host found Further reading Preface Recently I had faced an interesting question during an Interview. Question was, One of the virtual machine is in error state, how will you troubleshoot?. Well, thats a general question and all of them went through it atleast once? [Read More]

What is an Overcommit in cloud ? Overcommitting Memory Overcommitting CPU Why its important in a Public Cloud Where are the Overcommit values in Openstack Well, I have a very special requirement Solution Create the aggregate Add your computes to this Aggregate Setting up Overcommit values to this particular Aggregate How the Guest VM know, i should go to this Aggregate Inject Flavor metadata Check the flavor now Add few filters in nova Disable the current allocation from nova Restart nova Workflow Further Reading What is an Overcommit in cloud ? [Read More]