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
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.
setting hostname, domainname will not affect rest of
the system (CLONE_NEWUTS
flag).
process will have independent namespace for System V
message queues, semaphore sets and shared memory
segments (CLONE_NEWIPC
flag).
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.
process will have distinct set of UIDs, GIDs and
capabilities (CLONE_NEWUSER flag).
clone(2) for exact semantics of the flags.
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 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.
−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 enter calls fork before calling exec so that the children will be in the newly entered pid namespace.
−V, −−versionDisplay version information and exit.
−h, −−helpPrint a help message.
The nsenter command is part of the util-linux package and is available from Linux Kernel Archive
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