nsenter — run program with namespaces of other processes
nsenter [options] [ program
[arguments] ]
Enters the namespaces of one or more other processes and then executes the specified program. Enterable namespaces are:
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
flag).
Setting hostname or domainname will not affect the
rest of the system. (CLONE_NEWUTS flag)
The process will have an independent namespace for
System V message queues, semaphore sets and shared
memory segments. (CLONE_NEWIPC flag)
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)
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 program and its children share the same
PID namespace and are visible to each other. If
−−no−fork
is used, the new program will be exec'ed without
forking.
The process will have a distinct set of UIDs, GIDs
and capabilities. (CLONE_NEWUSER flag)
program is not given, then
``${SHELL}'' is run (default: /bin/sh).−t, −−target pidSpecify a target process to get contexts from. The paths to the contexts specified by pid are:
/proc/pid/ns/mntthe mount namespace
/proc/pid/ns/utsthe UTS namespace
/proc/pid/ns/ipcthe IPC namespace
/proc/pid/ns/netthe network namespace
/proc/pid/ns/pidthe PID namespace
/proc/pid/ns/userthe user namespace
/proc/pid/rootthe root directory
/proc/pid/cwdthe 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. See also the −−setuid and −−setgid options.
−G, −−setgid gidSet the group ID which will be used in the entered user namespace.
−S, −−setuid uidSet the user ID which will be used in the entered user namespace.
−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−forkDo not fork before exec'ing the specified program. By default, when entering a PID namespace, nsenter calls fork before calling exec so that any children will also be in the newly entered PID namespace.
−V, −−versionDisplay version information and exit.
−h, −−helpDisplay help text and exit.
The nsenter command is part of the util-linux package and is available from Linux Kernel Archive
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