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

Solution Verified - Updated -

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

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