Troubleshooting

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Introduction

This side is a miscellany of troubleshooting Technics.

Debugging Installation

Can be used if you can't boot your PVE Host.

See Debugging_Installation

Enable kernel dumb

If you have a kernel panic it can be very usful to have a kernel dump to analyse the problem.

See Enable_Core_Dump_systemd

Debug LXC

When a Container fail to start.

See Linux_Container paragraph "Obtaining Debugging Logs".

Switch novnc KVM console

I can't switch virtual consoles in Linux KVM guests with alt-F1, alt-F2... VNC viewer does not pass some key combinations or they may be intercepted by your operating system.

To send custom key combinations to the guest, go to "Monitor" in Virtual Machine Configuration for a given guest and use "sendkey" command.

For example, to switch to the third console (tty3) you would use:

sendkey alt-f3

Send sysrq to KVM VM

How can I send sysrq to Linux KVM guests? Similarly to the above, go to "Monitor" in Virtual Machine Configuration for a given guest and use "sendkey" command.

For example, to issue "Emergency Sync", you would use:

sendkey alt-sysrq-s

In the VNC viewer for the given guest you should see:

SysRq : Emergency Sync

You should also see this entry if you run "dmesg" on this guest.

See also http://en.wikipedia.org/wiki/Magic_SysRq_key for a full reference of possible combinations.

"error: out of partition" after a fresh install

The error message below may happens when you had two or more harddrives connected during the installation. Try to disconnect all but one disk.

error: out of partition.
grub rescue>

Cluster & Multicast issues

See Troubleshooting multicast, quorum and cluster issues.

See also