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Unable to start parallels-server service: Module prl_vtdhook not found

APPLIES TO:
  • Parallels Cloud Server
  • Parallels Virtuozzo Containers for Linux 4.7
  • Parallels Server

Symptoms

It is not possible to start parallels-server service:

[root@pcs ~]# /etc/init.d/parallels-server start
Starting Parallels Cloud Server:                           [  OK  ]
Load OOM groups                                            [  OK  ]
Starting Parallels services
    Loading Parallels kernel modules:FATAL: Module prl_vtdhook not found.
Cannot load module 'prl_vtdhook'

Cause

  1. The recent updates were installed, but the server was not rebooted.
  2. The node has been rebooted into an older kernel, while there's a new kernel installed.
  3. 'vzkernel' package was updated solely, without updating 'parallels-kernel-modules' package.

Resolution

Verify that GRUB is configured to boot into the most recent kernel:

[root@pcs ~]# egrep 'default|vmlinuz' /boot/grub/grub.conf
default=0
        kernel /boot/vmlinuz-2.6.32-042stab081.5 ro root=UUID=02e46b24-0a8e-4d0c-9547-4027bc624592 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 psbm rd_NO_MD pram_low=128M crashkernel=auto rd_NO_PLYMOUTH SYSFONT=latarcyrheb-sun16 rd_NO_LVM rd_NO_DM rhgb quiet
        kernel /boot/vmlinuz-2.6.32-042stab079.6 ro root=UUID=02e46b24-0a8e-4d0c-9547-4027bc624592 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 psbm rd_NO_MD pram_low=128M crashkernel=auto rd_NO_PLYMOUTH SYSFONT=latarcyrheb-sun16 rd_NO_LVM rd_NO_DM rhgb quiet
        kernel /boot/vmlinuz-2.6.32-042stab076.5 ro root=UUID=02e46b24-0a8e-4d0c-9547-4027bc624592 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 psbm rd_NO_MD pram_low=128M crashkernel=auto rd_NO_PLYMOUTH SYSFONT=latarcyrheb-sun16 rd_NO_LVM rd_NO_DM rhgb quiet

In this example, the default kernel to be booted is 2.6.32-042stab081.5.

Restart the hardware node after applying the necessary changes to the GRUB configuration.

In addition, make sure that all Parallels Cloud Server updates have been installed, follow these instructions in order to achieve that.

Search words:

all vms down

reboot

Module prl_vtdhook not found

Cannot load module 'prl_vtdhook'

parallels-server

pcs services can't start




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