NSENTER(1) User Commands NSENTER(1)NAMEnsenter - run program with namespaces of other processes
SYNOPSISnsenter [options] [program] [arguments]
DESCRIPTION
Enters the namespaces of one or more other processes and then executes
the specified program. Enterable namespaces are:
mount namespace
mounting and unmounting filesystems will not affect rest of the
system (CLONE_NEWNS flag), except for filesystems which are
explicitly marked as shared (by mount --make-shared). See /proc
/self/mountinfo for the shared flag.
UTS namespace
setting hostname, domainname will not affect rest of the system
(CLONE_NEWUTS flag).
IPC namespace
process will have independent namespace for System V message
queues, semaphore sets and shared memory segments (CLONE_NEWIPC
flag).
network namespace
process will have independent IPv4 and IPv6 stacks, IP routing
tables, firewall rules, the /proc/net and /sys/class/net direc‐
tory trees, sockets etc. (CLONE_NEWNET flag).
PID namespace
children will have a set of PID to process mappings separate
from the nsenter process (CLONE_NEWPID flag). nsenter will fork
by default if changing the PID namespace, so that the new pro‐
gram and its children share the same PID namespace and are visi‐
ble to each other. If --no-fork is used, the new program will
be exec'ed without forking.
user namespace
process will have distinct set of UIDs, GIDs and capabilities
(CLONE_NEWUSER flag).
See the
clone(2) for exact semantics of the flags.
If program is not given, run ``${SHELL}'' (default: /bin/sh).
OPTIONS
Argument with square brakets, such as [file], means optional argument.
Command line syntax to specify optional argument --mount=/path/to/file.
Please notice the equals sign.
-t, --target pid
Specify a target process to get contexts from. The paths to the
contexts specified by pid are:
/proc/pid/ns/mnt the mount namespace
/proc/pid/ns/uts the UTS namespace
/proc/pid/ns/ipc the IPC namespace
/proc/pid/ns/net the network namespace
/proc/pid/ns/pid the PID namespace
/proc/pid/ns/user the user namespace
/proc/pid/root the root directory
/proc/pid/cwd the working directory respectively
-m, --mount [file]
Enter the mount namespace. If no file is specified enter the
mount namespace of the target process. If file is specified
enter the mount namespace specified by file.
-u, --uts [file]
Enter the UTS namespace. If no file is specified enter the UTS
namespace of the target process. If file is specified enter the
UTS namespace specified by file.
-i, --ipc [file]
Enter the IPC namespace. If no file is specified enter the IPC
namespace of the target process. If file is specified enter the
IPC namespace specified by file.
-n, --net [file]
Enter the network namespace. If no file is specified enter the
network namespace of the target process. If file is specified
enter the network namespace specified by file.
-p, --pid [file]
Enter the PID namespace. If no file is specified enter the PID
namespace of the target process. If file is specified enter the
PID namespace specified by file.
-U, --user [file]
Enter the user namespace. If no file is specified enter the
user namespace of the target process. If file is specified
enter the user namespace specified by file.
-r, --root [directory]
Set the root directory. If no directory is specified set the
root directory to the root directory of the target process. If
directory is specified set the root directory to the specified
directory.
-w, --wd [directory]
Set the working directory. If no directory is specified set the
working directory to the working directory of the target
process. If directory is specified set the working directory to
the specified directory.
-F, --no-fork
Do not fork before exec'ing the specified program. By default
when entering a pid namespace enter calls fork before calling
exec so that the children will be in the newly entered pid
namespace.
-V, --version
Display version information and exit.
-h, --help
Print a help message.
SEE ALSOsetns(2), clone(2)AUTHOR
Eric Biederman ⟨ebiederm@xmission.com⟩
AVAILABILITY
The nsenter command is part of the util-linux package and is available
from Linux Kernel Archive ⟨ftp://ftp.kernel.org/pub/linux/utils/util-
linux/⟩.
util-linux January 2013 NSENTER(1)
