Virtuozzo SWsoft OpenVZ Guía de usuario descargar pdf (Pagina 71)

Advanced Tasks 71

Rebooting Virtual Private Server

When you issue the reboot command at your Linux box console, the command makes the

reboot system call with argument ‘

restart’, which is passed to the computer BIOS. The

Linux kernel then reboots the computer. For obvious reasons this system call is blocked inside

Virtual Private Servers: no Virtual Private Server can access BIOS directly; otherwise, a reboot

inside a VPS would reboot the whole Hardware Node. That is why the

reboot command

inside a VPS actually works in a different way. On executing the

reboot command inside a

VPS, the VPS is stopped and then started by a special script (

/etc/sysconfig/vz-

scripts/vpsreboot

) which is executed periodically (every minute by default) by the cron

daemon. Cron configuration to run the script is in the file

/etc/cron.d/vpsreboot.

If you want a Virtual Private Server to be unable to initiate reboot itself, add the

ALLOWREBOOT=”no” line to the Virtual Private Server configuration file

(

/etc/sysconfig/vz-scripts/vps_id.conf). If you want to have VPS reboot

disabled by default and want to specify explicitly which Virtual Private Servers are allowed to

reboot, add the

ALLOWREBOOT=”no” line to the OpenVZ global configuration file

(

/etc/sysconfig/vz) and explicitly specify ALLOWREBOOT=”yes” in the corresponding

Virtual Private Server configuration files.

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Virtuozzo SWsoft OpenVZ Guía de usuario Pagina 71