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Alpine Linux unprivileged LXC containers
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At the moment unprivileged containers are only working with linux-vanilla.

They may work with grsecurity in the future with the following disabled:

	echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_mount
	echo 0 > /proc/sys/kernel/grsecurity/chroot_deny_pivot
	echo 0 > /proc/sys/kernel/grsecurity/chroot_caps

see also: https://en.wikibooks.org/wiki/Grsecurity/Runtime_Configuration
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Instructions:
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(a) add the name(s) of the containers to run unprivileged to /etc/conf.d/lxcfs
(b) rc-service lxcfs setup => converts privileged => unprivileged containers
			   => creates /etc/subuid & /etc/subgid
(c) rc-service lxcfs start
(d) rc-update add lxcfs
(e) rc-service lxcfs info => print & add config file settings to the containers

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Start the container & verify processes are running unprivileged:

ps aux | grep 100000