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Creative Commons Attribution 4.0 International License
© Rakhesh Sasidharan

Troubleshooting ESXi host reboots

Had to troubleshoot an ESXi host reboot today. Came across this link – good one.

Here’s what I did though after the host reboot.

Once the host was online I connected to it via the vSphere client. I didn’t connect to the host directly (though you can do that too). I connected to the vCenter, then navigated to that host, went to the File menu and exported the system logs.

exportsyslogs

This creates a zip file containing another archive. I extracted the contents of this into a folder. The root of that folder has the usual Linux filesystem structure.

dirstructure

I went into the var folder here. (The log subfolder has many logs but most of these might be from after the reboot. If that’s the case, check the run/log subfolder).

In my case the /var/log/vmksummary.log file had entries for when the host rebooted. None of the other files mentioned anything.

Then I went to the /var/run/log folder via PowerShell and ran a grep for the word reboot –

Lots of messages indicating that the host was rebooted via the DCUI (lines 2, 4, 5, and 12). Thus I realized someone had manually rebooted the host.

Troubleshooting ESXi host reboots by rakhesh is licensed under a Creative Commons Attribution 4.0 International License.