/usr/share/lxc/config/openwrt.common.conf is in lxc-templates 3.0.0-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Default console settings
lxc.tty.dir = lxc
lxc.tty.max = 4
lxc.pty.max = 1024
# Default capabilities
lxc.cap.drop = mac_admin
lxc.cap.drop = mac_override
lxc.cap.drop = sys_admin
lxc.cap.drop = sys_module
lxc.cap.drop = sys_nice
lxc.cap.drop = sys_pacct
lxc.cap.drop = sys_ptrace
lxc.cap.drop = sys_rawio
lxc.cap.drop = sys_resource
lxc.cap.drop = sys_time
lxc.cap.drop = sys_tty_config
lxc.cap.drop = syslog
lxc.cap.drop = wake_alarm
# Default cgroups - all denied except those whitelisted
lxc.cgroup.devices.deny = a
## /dev/null and zero
lxc.cgroup.devices.allow = c 1:3 rwm
lxc.cgroup.devices.allow = c 1:5 rwm
## consoles
lxc.cgroup.devices.allow = c 5:0 rwm
lxc.cgroup.devices.allow = c 5:1 rwm
## /dev/{,u}random
lxc.cgroup.devices.allow = c 1:8 rwm
lxc.cgroup.devices.allow = c 1:9 rwm
## /dev/pts/*
lxc.cgroup.devices.allow = c 5:2 rwm
lxc.cgroup.devices.allow = c 136:* rwm
## rtc
lxc.cgroup.devices.allow = c 254:0 rm
## tun
lxc.cgroup.devices.allow = c 10:200 rwm
## dev/tty0
lxc.cgroup.devices.allow = c 4:0 rwm
## dev/tty1
lxc.cgroup.devices.allow = c 4:1 rwm
## To use loop devices, copy the following line to the container's
## configuration file (uncommented).
#lxc.cgroup.devices.allow = b 7:* rwm
# Blacklist some syscalls which are not safe in privileged
# containers
lxc.seccomp.profile = /usr/share/lxc/config/common.seccomp
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