Cannot create Unprivledged container - not permitted on urandom and random


May 26, 2017
Chicago, Illinois USA
I am trying to create a Nextcloud container, but it is saying it is not permitted to mknod urandom and random. I don't know what this means, but I am having trouble finding the solution. I do not know what you need to know to help me, so please let me know.
Thanks in advance.

Formatting '/var/lib/vz/images/111/vm-111-disk-1.raw', fmt=raw size=8589934592
mke2fs 1.43.4 (31-Jan-2017)
Discarding device blocks: 4096/2097152 done
Creating filesystem with 2097152 4k blocks and 524288 inodes
Filesystem UUID: 0d617ac4-47e2-4928-acb4-9c4ad06ccc73
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Allocating group tables: 0/64 done
Writing inode tables: 0/64 done
Creating journal (16384 blocks): done
Multiple mount protection is enabled with update interval 5 seconds.
Writing superblocks and filesystem accounting information: 0/64 done

extracting archive '/var/lib/vz/template/cache/debian-9-turnkey-nextcloud_15.0-1_amd64.tar.gz'
tar: ./var/spool/postfix/dev/urandom: Cannot mknod: Operation not permitted
tar: ./var/spool/postfix/dev/random: Cannot mknod: Operation not permitted
Total bytes read: 1222912000 (1.2GiB, 46MiB/s)
tar: Exiting with failure status due to previous errors
TASK ERROR: command 'lxc-usernsexec -m u:0:100000:65536 -m g:0:100000:65536 -- tar xpf - -z --totals --one-file-system -p --sparse --numeric-owner --acls --xattrs '--xattrs-include=user.*' '--xattrs-include=security.capability' '--warning=no-file-ignored' '--warning=no-xattr-write' -C /var/lib/lxc/111/rootfs --skip-old-files --anchored --exclude './dev/*'' failed: exit code 2


Proxmox Staff Member
Staff member
Apr 28, 2005
Seem the template contains urandom device nodes. An unprivileged container is not allowed to create such device nodes.
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