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