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centosrootdd

dd returns permission denied even as root

I'm trying to backup a centos server using dd but I get permission denied even if I'm logged as root.

[root@server ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/vzfs              90G   58G   33G  64% /
none                  1.5G  4.0K  1.5G   1% /dev

[root@server ~]# dd if=/dev/vzfs of=/dev/null
dd: opening `/dev/vzfs': Permission denied

I don't know what to do from here, please help!

Best,

Julien

Solution

  • It's a virtual filesystem (container). You cannot access directly even as root-- it's only available from the actual system that the virtual machine is running on.