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.\" Process this file with
.\" groff -man -Tascii lscpu.1
.\"
.TH UNSHARE 1 "January 2013" "util-linux" "User Commands"
.SH NAME
unshare \- run program with some namespaces unshared from parent
.SH SYNOPSIS
.B unshare
.RI [ options ]
program
.RI [ arguments ]
.SH DESCRIPTION
Unshares specified namespaces from parent process and then executes specified
program. Unshareable namespaces are:
.TP
.BR "mount namespace"
mounting and unmounting filesystems will not affect rest of the system
(\fBCLONE_NEWNS\fP flag), except for filesystems which are explicitly marked as
shared (by mount --make-shared). See /proc/self/mountinfo for the shared flags.
.TP
.BR "UTS namespace"
setting hostname, domainname will not affect rest of the system
(\fBCLONE_NEWUTS\fP flag).
.TP
.BR "IPC namespace"
process will have independent namespace for System V message queues, semaphore
sets and shared memory segments (\fBCLONE_NEWIPC\fP flag).
.TP
.BR "network namespace"
process will have independent IPv4 and IPv6 stacks, IP routing tables, firewall
rules, the \fI/proc/net\fP and \fI/sys/class/net\fP directory trees, sockets
etc. (\fBCLONE_NEWNET\fP flag).
.TP
.BR "pid namespace"
children will have a distinct set of pid to process mappings than their parent.
(\fBCLONE_NEWPID\fP flag).
.TP
.BR "user namespace"
process will have distinct set of uids, gids and capabilities. (\fBCLONE_NEWUSER\fP flag).
.TP
See the \fBclone\fR(2) for exact semantics of the flags.
.SH OPTIONS
.TP
.BR \-h , " \-\-help"
Print a help message,
.TP
.BR \-m , " \-\-mount"
Unshare the mount namespace,
.TP
.BR \-u , " \-\-uts"
Unshare the UTS namespace,
.TP
.BR \-i , " \-\-ipc"
Unshare the IPC namespace,
.TP
.BR \-n , " \-\-net"
Unshare the network namespace.
.TP
.BR \-p , " \-\-pid"
Unshare the pid namespace.
.TP
.BR \-U , " \-\-user"
Unshare the user namespace.
.SH SEE ALSO
.BR unshare (2),
.BR clone (2)
.SH BUGS
None known so far.
.SH AUTHOR
Mikhail Gusarov <dottedmag@dottedmag.net>
.SH AVAILABILITY
The unshare command is part of the util-linux package and is available from
ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
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