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lxc-usernsexec - Online in the Cloud

Run lxc-usernsexec in OnWorks free hosting provider over Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

This is the command lxc-usernsexec that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

PROGRAM:

NAME


lxc-usernsexec - Run a task as root in a new user namespace.

SYNOPSIS


lxc-usernsexec [-m uid-map] {-- command}

DESCRIPTION


lxc-usernsexec can be used to run a task as root in a new user namespace.

OPTIONS


-m uid-map
The uid map to use in the user namespace. Each map consists of four colon-separate
values. First a character 'u', 'g' or 'b' to specify whether this map pertains to
user ids, group ids, or both; next the first userid in the user namespace; next the
first userid as seen on the host; and finally the number of ids to be mapped.

More than one map can be specified. If no map is specified, then by default the
full uid and gid ranges granted by /etc/subuid and /etc/subgid will be mapped to
the uids and gids starting at 0 in the container.

Note that lxc-usernsexec always tries to setuid and setgid to 0 in the namespace.
Therefore uid 0 in the namespace must be mapped.

EXAMPLES


To spawn a shell with the full allotted subuids mapped into the container, use

lxc-usernsexec

To run a different shell than /bin/sh, use

lxc-usernsexec -- /bin/bash

If your user id is 1000, root in a container is mapped to 190000, and you wish to chown a
file you own to root in the container, you can use:

lxc-usernsexec -m b:0:1000:1 -m b:1:190000:1 -- /bin/chown 1:1 $file

This maps your userid to root in the user namespace, and 190000 to uid 1. Since root in
the user namespace is privileged over all userids mapped into the namespace, you are
allowed to change the file ownership, which you could not do on the host using a simple
chown.

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