lxc-unshare(1)                                                                     lxc-unshare(1)



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 main‐
       ly provided for testing purposes.  Despite its name, it always uses clone rather than  un‐
       share  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.

       -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-destroy(1), lxc-start(1), lxc-stop(1), lxc-execute(1), lxc-con‐
       sole(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 AT free.fr>



                                   Sat Apr 29 06:45:43 UTC 2017                    lxc-unshare(1)