OnWorks favicon

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



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


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


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


-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.


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


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

Use lxc-usernsexec online using onworks.net services

Free Servers & Workstations

Download Windows & Linux apps

  • 1
    USBLoaderGX is a GUI for
    Waninkoko's USB Loader, based on
    libwiigui. It allows listing and
    launching Wii games, Gamecube games and
    homebrew on Wii and WiiU...
    Download USBLoaderGX
  • 2
    Firebird RDBMS offers ANSI SQL features
    & runs on Linux, Windows &
    several Unix platforms. Features
    excellent concurrency & performance
    & power...
    Download Firebird
  • 3
    KompoZer is a wysiwyg HTML editor using
    the Mozilla Composer codebase. As
    Nvu's development has been stopped
    in 2005, KompoZer fixes many bugs and
    adds a f...
    Download KompoZer
  • 4
    Free Manga Downloader
    Free Manga Downloader
    The Free Manga Downloader (FMD) is an
    open source application written in
    Object-Pascal for managing and
    downloading manga from various websites.
    This is a mirr...
    Download Free Manga Downloader
  • 5
    UNetbootin allows you to create bootable
    Live USB drives for Ubuntu, Fedora, and
    other Linux distributions without
    burning a CD. It runs on Windows, Linux,
    and ...
    Download UNetbootin
  • 6
    Dolibarr ERP - CRM
    Dolibarr ERP - CRM
    Dolibarr ERP - CRM is an easy to use
    ERP and CRM open source software package
    (run with a web php server or as
    standalone software) for businesses,
    Download Dolibarr ERP - CRM
  • More »

Linux commands