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How do I capture a vmcore from a KVM or RHEV guest?

Solution Verified - Updated 2017-05-16T01:11:51+00:00 -

Issue

How do I capture a vmcore from a KVM guest?
How do I capture a vmcore from a RHEV guest?
Is there any special panic dump facility for KVM and RHEV guests?
Can I use the guests vmcore to diagnose issues like:
- vm was hung state
- KVM host and guest servers are down

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Virtualization all versions
Red Hat Virtualization all versions
Red Hat Openstack all versions

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