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How to troubleshoot kernel crashes, hangs, or reboots with kdump on Red Hat Enterprise Linux

Solution Verified - Updated 2019-02-06T23:48:37+00:00 -

Issue

How do I configure kexec/kdump on RHEL?
How much disk space is required for kdump to dump the vmcore?
Need RCA of kernel crash/panic
How do I troubleshoot a server crash/reboot?
Want root cause of a system reboot
How do I capture a vmcore on my server?
My server hung or became unresponsive, how to troubleshoot?
Problem collecting a core file with kdump on a host
How much time is required to capture vmcore?
System freezes unexpectedly, how to troubleshoot?

Environment

Red Hat Enterprise Linux 5 [Below steps are not applicable for s390 or z/VM RHEL 5 instances]
Red Hat Enterprise Linux 6 [RHEL 6 update 3 is required for s390 or z/VM RHEL instances]
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

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