# lxc-unshare

## NAME



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


## SYNOPSIS



           **lxc-unshare**{-s, --namespaces _namespaces_} [-u, --user _user_] [-H,
                       --hostname _hostname_] [-i, --ifname _ifname_] [-d,
                       --daemon] [-M, --remount] {command}
    


## DESCRIPTION



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


## OPTIONS



           **-s, --namespaces** _namespaces_
                  Specify the namespaces to attach to, as a pipe-separated
                  list, e.g. _NETWORK|IPC_. Allowed values are _MOUNT_ , _PID_ , _UT‐_
                  _SNAME_ , _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** _user_
                  Specify a userid which the new task should become.
    
           **-H, --hostname** _hostname_
                  Set the hostname in the new container. Only allowed if the
                  UTSNAME namespace is set.
    
           **-i, --ifname** _interfacename_
                  Move the named interface into the container. Only allowed
                  if the NETWORK namespace is set. You may specify this argu‐
                  ment multiple times to move multiple interfaces into con‐
                  tainer.
    
           **-d, --daemon**
                  Daemonize (do not wait for the container to exit before ex‐
                  iting)
    
           **-M, --remount**
                  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 inter‐
           faces.  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 name‐
           space.
    
                     lxc-unshare -s "NETWORK|PID|MOUNT|UTSNAME" -M -H myhostname -i veth1 /bin/bash
    
           The resulting shell will have pid 1 and will see two network in‐
           terfaces (lo and veth1). The hostname will be "myhostname" and
           /proc will have been remounted. ps output will show there are no
           other processes in the namespace.
    


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