nsenter(1)



NSENTER(1)                       User Commands                      NSENTER(1)

NAME
       nsenter - run program with namespaces of other processes

SYNOPSIS
       nsenter [options] [program [arguments]]

DESCRIPTION
       Enters  the namespaces of one or more other processes and then executes
       the specified program. If program is not given,  then  ``${SHELL}''  is
       run (default: /bin/sh).

       Enterable namespaces are:

       mount namespace
              Mounting  and unmounting filesystems will not affect the rest of
              the system, except for filesystems which are  explicitly  marked
              as  shared  (with  mount --make-shared; see /proc/self/mountinfo
              for the shared flag).  For  further  details,  see  mount_names-
              paces(7) and the discussion of the CLONE_NEWNS flag in clone(2).

       UTS namespace
              Setting  hostname  or domainname will not affect the rest of the
              system.  For further details, see namespaces(7) and the  discus-
              sion of the CLONE_NEWUTS flag in clone(2).

       IPC namespace
              The process will have an independent namespace for POSIX message
              queues as well as System V message queues,  semaphore  sets  and
              shared  memory segments.  For further details, see namespaces(7)
              and the discussion of the CLONE_NEWIPC flag in clone(2).

       network namespace
              The process will have independent IPv4 and IPv6 stacks, IP rout-
              ing  tables,  firewall  rules,  the /proc/net and /sys/class/net
              directory trees, sockets, etc.  For further details, see  names-
              paces(7)   and  the  discussion  of  the  CLONE_NEWNET  flag  in
              clone(2).

       PID namespace
              Children will have a set of PID  to  process  mappings  separate
              from  the  nsenter  process  For further details, see pid_names-
              paces(7) and the discussion of the CLONE_NEWPID flag in  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 pro-
              gram will be exec'ed without forking.

       user namespace
              The process will have a distinct set of UIDs, GIDs and capabili-
              ties.   For further details, see user_namespaces(7) and the dis-
              cussion of the CLONE_NEWUSER flag in clone(2).

       cgroup namespace
              The process will have a virtualized view  of  /proc/self/cgroup,
              and  new  cgroup  mounts  will be rooted at the namespace cgroup
              root.  For further details,  see  cgroup_namespaces(7)  and  the
              discussion of the CLONE_NEWCGROUP flag in clone(2).

       See clone(2) for the exact semantics of the flags.

OPTIONS
       Various of the options below that relate to namespaces take an optional
       file argument.  This  should  be  one  of  the  /proc/[pid]/ns/*  files
       described in namespaces(7).

       -a, --all
              Enter  all  namespaces  of  the  target  process  by the default
              /proc/[pid]/ns/* namespace paths. The default paths to the  tar-
              get  process namespaces may be overwritten by namespace specific
              options (e.g. --all --mount=[path]).

              The user namespace will be ignored if the same as  the  caller's
              current  user  namespace.  It prevents a caller that has dropped
              capabilities from regaining those capabilities  via  a  call  to
              setns().  See setns(2) for more details.

       -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/ns/cgroup the cgroup 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.   See  also  the
              --setuid and --setgid options.

       -C, --cgroup[=file]
              Enter  the cgroup namespace.  If no file is specified, enter the
              cgroup namespace of the target process.  If file  is  specified,
              enter the cgroup namespace specified by file.

       -G, --setgid gid
              Set the group ID which will be used in the entered namespace and
              drop supplementary groups.  nsenter(1) always sets GID for  user
              namespaces, the default is 0.

       -S, --setuid uid
              Set  the  user  ID  which will be used in the entered namespace.
              nsenter(1) always sets UID for user namespaces, the  default  is
              0.

       --preserve-credentials
              Don't  modify UID and GID when enter user namespace. The default
              is to drops supplementary groups and sets GID and UID to 0.

       -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, nsenter calls fork before calling
              exec so that any children will also be in the newly entered  PID
              namespace.

       -Z, --follow-context
              Set  the  SELinux  security  context  used  for  executing a new
              process according to already running process specified by --tar-
              get PID. (The util-linux has to be compiled with SELinux support
              otherwise the option is unavailable.)

       -V, --version
              Display version information and exit.

       -h, --help
              Display help text and exit.

SEE ALSO
       clone(2), setns(2), namespaces(7)

AUTHORS
       Eric Biederman <biederm@xmission.com>
       Karel Zak <kzak@redhat.com>

AVAILABILITY
       The nsenter command is part of the util-linux package and is  available
       from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils/util-
       linux/>.

util-linux                         June 2013                        NSENTER(1)

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