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Man Pages


Manual Reference Pages  -  UNSHARE (1)

NAME

unshare - run program with some namespaces unshared from parent

CONTENTS

Synopsis
Description
Options
See Also
Bugs
Author
Availability

SYNOPSIS

unshare [options] program [arguments]

DESCRIPTION

Unshares the indicated namespaces from the parent process and then executes the specified program. The namespaces to be unshared are indicated via options. Unshareable namespaces are:
mount namespace
  Mounting and unmounting filesystems will not affect the rest of the system (CLONE_NEWNS flag), except for filesystems which are explicitly marked as shared (with mount --make-shared; see /proc/self/mountinfo for the shared flags).

It’s recommended to use mount --make-rprivate or mount --make-rslave after unshare --mount to make sure that mountpoints in the new namespace are really unshared from parental namespace.

UTS namespace
  Setting hostname or domainname will not affect the rest of the system. (CLONE_NEWUTS flag)
IPC namespace
  The process will have an independent namespace for System V message queues, semaphore sets and shared memory segments. (CLONE_NEWIPC flag)
network namespace
  The process will have independent IPv4 and IPv6 stacks, IP routing tables, firewall rules, the /proc/net and /sys/class/net directory trees, sockets, etc. (CLONE_NEWNET flag)
pid namespace
  Children will have a distinct set of PID to process mappings from their parent. (CLONE_NEWPID flag)
See clone(2) for the exact semantics of the flags.

OPTIONS

-h, --help
  Display help text and exit.
-i, --ipc
  Unshare the IPC namespace.
-m, --mount
  Unshare the mount namespace.
-n, --net
  Unshare the network namespace.
-p, --pid
  Unshare the pid namespace. See also the --fork and --mount-proc options.
-u, --uts
  Unshare the UTS namespace.
-f, --fork
  Fork the specified program as a child process of unshare rather than running it directly. This is useful when creating a new pid namespace.
--mount-proc[=mountpoint]
  Just before running the program, mount the proc filesystem at the mountpoint (default is /proc). This is useful when creating a new pid namespace. It also implies creating a new mount namespace since the /proc mount would otherwise mess up existing programs on the system. The new proc filesystem is explicitly mounted as private (by MS_PRIVATE|MS_REC).

SEE ALSO

unshare(2), clone(2), mount(8)

BUGS

None known so far.

AUTHOR

Mikhail Gusarov <dottedmag@dottedmag.net>

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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util-linux UNSHARE (1) July 2013

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