Virtuozzo SWsoft OpenVZ Guide de l'utilisateur télécharger pdf (Page 75)

Troubleshooting 75

Kernel Troubleshooting

Using ALT+SYSRQ Keyboard Sequences

Press ALT+SYSRQ+H (3 keys simultaneously) and check what's printed at the HN console, for

example:

SysRq : HELP : loglevel0-8 reBoot tErm Full kIll saK showMem Nice

powerOff showPc unRaw Sync showTasks Unmount

This output shows you what ALT+SYSRQ sequences you may use for performing this or that

command. The capital letters in the command names identify the sequence. Thus, if there are

any troubles with the machine and you're about to reboot it, please press the following

sequences before pressing the Power button:

ALT+SYSRQ+M to dump memory info;

ALT+SYSRQ+P to dump processes states;

ALT+SYSRQ+S to sync disks;

ALT+SYSRQ+U to unmount all mounted filesystems;

ALT+SYSRQ+E to terminate processes;

ALT+SYSRQ+I to kill all processes

ALT+SYSRQ+U to try to unmount once again;

ALT+SYSRQ+B to reboot.

If the computer is not rebooted after that, you can press the Power button.

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Virtuozzo SWsoft OpenVZ Guide de l'utilisateur Page 75