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.TH UNSHARE 1 "October 2008" "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
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 UTC namespace,
.TP
.BR \-i , " \-\-ipc"
Unshare the IPC namespace,
.TP
.BR \-n , " \-\-net"
Unshare the network namespace.
.SH NOTES
The unshare command drops potential privileges before executing the
target program. This allows to setuid unshare.
.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/.