Article ID: 123022, created on Sep 28, 2014, last review on Jun 17, 2016

  • Applies to:
  • Virtuozzo 6.0


Unprivileged user created VM on a node with PCS 6.0 Update 7 installed:

~$ prlctl create testvm --ostemplate some-vm-template

And it is not possible to resize the hard disk for this VM:

~$ prl_disk_tool resize --size 100G --hdd '/var/parallels/testvm.pvm/testvm.hdd' --resize_partition
Can't open lock file /var/lock/ploop/ploop.lck: Permission denied
Unable to check ploop mount status.


In order to unify operations with disk images of virtual machines and containers, in Parallels Clous Server 6.0 update 7, all disk operations are done using Ploop device. The default permissions do not allow unprivileged user to manage disk images in this way.

This issue has been reported in the internal request PSBM-28144.


The permanent fix will be included in one of the future product updates.

As an immediate workaround, it is possible set appropriate permissions to the lock file when logging in using an administrative account:

~# chmod a+rw /var/lock/ploop/ploop.lck

Search Words

resize fails permission denied

Disk resize unprivileged user


Can't open lock file /var/lock/ploop/ploop.lck: Permission denied

c62e8726973f80975db0531f1ed5c6a2 2897d76d56d2010f4e3a28f864d69223 0dd5b9380c7d4884d77587f3eb0fa8ef

Email subscription for changes to this article
Save as PDF