By default on proxmox, the command 'dmesg' gives the global output from the main node. You don't want that for security reasons.
To disable this, do the following:
1. Open the file 'common.seccomp'
nano /usr/share/lxc/config/common.seccomp
2. Add the following to the bottom:
syslog errno 1
Save! That's it. Make sure to restart your containers in order for it to have effect.
