NAME

       lxc-unshare - Run a task in a new set of namespaces.

SYNOPSIS

       lxc-unshare {-s namespaces} [-u user] [-H hostname] [-i ifname] [-d] [-M] {command}

DESCRIPTION

       lxc-unshare  can  be  used  to  run  a task in a cloned set of namespaces. This command is
       mainly provided for testing purposes.  Despite its name, it always uses clone rather  than
       unshare  to  create  the  new  task  with  fresh  namespaces.  Apart  from  testing kernel
       regressions this should make no difference.

OPTIONS

       -s namespaces
              Specify the namespaces to attach to, as a pipe-separated  list,  e.g.  NETWORK|IPC.
              Allowed  values  are MOUNT, PID, UTSNAME, IPC, USER and NETWORK. This allows one to
              change the context of the process to e.g. the network namespace  of  the  container
              while  retaining  the other namespaces as those of the host. (The pipe symbol needs
              to be escaped, e.g.  MOUNT\|PID or quoted, e.g.  "MOUNT|PID".)

       -u user
              Specify a userid which the new task should become.

       -H hostname
              Set the hostname in the new container. Only allowed if  the  UTSNAME  namespace  is
              set.

       -i interfacename
              Move  the named interface into the container. Only allowed if the NETWORK namespace
              is set. You may specify this argument multiple times to  move  multiple  interfaces
              into container.

       -d     Daemonize (do not wait for the container to exit before exiting)

       -M     Mount  default  filesystems (/proc /dev/shm and /dev/mqueue) in the container. Only
              allowed if MOUNT namespace is set.

EXAMPLES

       To spawn a new shell with its own UTS (hostname) namespace,

                 lxc-unshare -s UTSNAME /bin/bash

       If the hostname is changed in that shell, the change will not be reflected on the host.

       To spawn a shell in a new network, pid, and mount namespace,

                 lxc-unshare -s "NETWORK|PID|MOUNT" /bin/bash

       The resulting shell will have pid 1 and will see no network interfaces.  After re-mounting
       /proc in that shell,

                 mount -t proc proc /proc

       ps output will show there are no other processes in the namespace.

       To spawn a shell in a new network, pid, mount, and hostname namespace.

                 lxc-unshare -s "NETWORK|PID|MOUNT|UTSNAME" -M -H slave -i veth1 /bin/bash

       The  resulting  shell  will have pid 1 and will see two network interfaces (lo and veth1).
       The hostname will be "slave" and /proc will have been remounted. ps output will show there
       are no other processes in the namespace.

SEE ALSO

       lxc(7),   lxc-create(1),  lxc-copy(1),  lxc-destroy(1),  lxc-start(1),  lxc-stop(1),  lxc-
       execute(1), lxc-console(1), lxc-monitor(1), lxc-wait(1),  lxc-cgroup(1),  lxc-ls(1),  lxc-
       info(1), lxc-freeze(1), lxc-unfreeze(1), lxc-attach(1), lxc.conf(5)

AUTHOR

       Daniel Lezcano <daniel.lezcano@free.fr>

                                            2019-04-09                             lxc-unshare(1)