System Administration Guide: Basic Administration

How to Create an LOFS File System

  1. Become superuser or assume an equivalent role.

  2. Create the directory you want to mount as an LOFS file system, if necessary.

    # mkdir loopback-directory
  3. Grant the appropriate permissions and ownership on the newly created directory.

  4. Create the mount point where you want to mount the LOFS file system, if necessary.

    # mkdir /mount-point
  5. Mount the LOFS file system.

    # mount -F lofs loopback-directory /mount-point


    Specifies the file system to be mounted on the loopback mount point. 


    Specifies the directory on which to mount the LOFS file system. 

  6. Verify that the LOFS file system has been mounted.

    # mount -v

Example—Creating and Mounting an LOFS File System

The following example illustrates how to create, mount, and test new software in the /new/dist directory as a loopback file system without actually having to install it.

# mkdir /tmp/newroot
# mount -F lofs /new/dist /tmp/newroot
# chroot /tmp/newroot newcommand 

Example—Mounting an LOFS File System at Boot Time

You can set up the system to automatically mount an LOFS file system when it boots by adding an entry to the end of the /etc/vfstab file. The following example shows an entry in the /etc/vfstab file that mounts an LOFS file system for the root (/) file system on /tmp/newroot.

/ - /tmp/newroot  lofs   -  yes  -

Caution – Caution –

Make sure the loopback entries are the last entries in the /etc/vfstab file. Otherwise, if the /etc/vfstab entry for a loopback file system precedes the file systems to be included in it, the loopback file system cannot be mounted.

For more information on the /etc/vfstab file, see Field Descriptions for the /etc/vfstab File.