virt-login-shell man page

virt-login-shell — tool to execute a shell within a container matching the users name

Synopsis

virt-login-shell [OPTION]

Description

The virt-login-shell program is a setuid shell that is used to join an LXC container that matches the user's name. If the container is not running, virt-login-shell will attempt to start the container. virt-login-shell is not allowed to be run by root. Normal users will get added to a container that matches their username, if it exists, and they are configured in /etc/libvirt/virt-login-shell.conf.

The basic structure of most virt-login-shell usage is:

virt-login-shell

Options

-c CMD
Instruct the shell to run CMD instead of presenting an interactive shell prompt.
-h, --help
Display command line help usage then exit.
-V, --version
Display version information then exit.

Config

By default, virt-login-shell will execute the /bin/sh program for the user. You can modify this behaviour by defining the shell variable in /etc/libvirt/virt-login-shell.conf.

eg. shell = [ "/bin/bash" ]

If the 'auto_shell' config option is set then it will attempt to automatically detect the shell from /etc/password inside the container. This should only be done if the container has a separate /etc directory from the host, otherwise it will end up recursively invoking virt-login-shell.

eg. auto_shell = 1

By default no users are allowed to use virt-login-shell, if you want to allow certain users to use virt-login-shell, you need to modify the allowed_users variable in /etc/libvirt/virt-login-shell.conf.

eg. allowed_users = [ "tom", "dick", "harry" ]

Exit Status

virt-login-shell normally returns the exit status of the command it executed. If the command was killed by a signal, but that signal is not fatal to virt-login-shell, then it returns the signal number plus 128.

Exit status generated by virt-login-shell itself:

0 An option was used to learn more about this binary.

125 Generic error before attempting execution of the configured shell; for example, if libvirtd is not running.

126 The configured shell exists but could not be executed.

127 The configured shell could not be found.

Bugs

Report any bugs discovered to the libvirt community via the mailing list <http://libvirt.org/contact.html> or bug tracker <http://libvirt.org/bugs.html>. Alternatively report bugs to your software distributor / vendor.

Authors

Please refer to the AUTHORS file distributed with libvirt.
Daniel Walsh <dwalsh at redhat dot com>

License

virt-login-shell is distributed under the terms of the GNU LGPL v2+. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE

See Also

virsh(1), <http://www.libvirt.org/>

Info

2016-06-22 libvirt-2.0.0 Virtualization Support