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12.3. Directory-based Storage Pools

This section covers storing guest virtual machines in a directory on the host physical machine.
Directory-based storage pools can be created with virt-manager or the virsh command line tools.

  1. Create the local directory

    1. Optional: Create a new directory for the storage pool

      Create the directory on the host physical machine for the storage pool. This example uses a directory named /guest virtual machine_images. 
      # mkdir /guest_images
      Copy to Clipboard Toggle word wrap

    2. Set directory ownership

      Change the user and group ownership of the directory. The directory must be owned by the root user. 
      # chown root:root /guest_images
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    3. Set directory permissions

      Change the file permissions of the directory. 
      # chmod 700 /guest_images
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    4. Verify the changes

      Verify the permissions were modified. The output shows a correctly configured empty directory. 
      # ls -la /guest_images
total 8
drwx------.  2 root root 4096 May 28 13:57 .
dr-xr-xr-x. 26 root root 4096 May 28 13:57 ..
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  2. Configure SELinux file contexts

    Configure the correct SELinux context for the new directory. Note that the name of the pool and the directory do not have to match. However, when you shutdown the guest virtual machine, libvirt has to set the context back to a default value. The context of the directory determines what this default value is. It is worth explicitly labeling the directory virt_image_t, so that when the guest virtual machine is shutdown, the images get labeled 'virt_image_t' and are thus isolated from other processes running on the host physical machine. 
    # semanage fcontext -a -t virt_image_t '/guest_images(/.*)?'
# restorecon -R /guest_images
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  3. Open the storage pool settings

    1. In the virt-manager graphical interface, select the host physical machine from the main window.
      Open the Edit menu and select Connection Details
      Connection details window
      View larger image
      Connection details window

      Figure 12.7. Connection details window

    2. Click on the Storage tab of the Connection Details window.
      Storage tab
      View larger image
      Storage tab

      Figure 12.8. Storage tab

  4. Create the new storage pool

    1. Add a new pool (part 1)

      Press the + button (the add pool button). The Add a New Storage Pool wizard appears.
      Choose a Name for the storage pool. This example uses the name guest_images. Change the Type to dir: Filesystem Directory.
      Name the storage pool
      View larger image
      Name the storage pool

      Figure 12.9. Name the storage pool

      Press the Forward button to continue.

    2. Add a new pool (part 2)

      Change the Target Path field. For example, /guest_images.
      Verify the details and press the Finish button to create the storage pool.

  5. Verify the new storage pool

    The new storage pool appears in the storage list on the left after a few seconds. Verify the size is reported as expected, 36.41 GB Free in this example. Verify the State field reports the new storage pool as Active.
    Select the storage pool. In the Autostart field, confirm that the On Boot check box is checked. This will make sure the storage pool starts whenever the libvirtd service starts.
    Verify the storage pool information
    View larger image
    Verify the storage pool information

    Figure 12.10. Verify the storage pool information

    The storage pool is now created, close the Connection Details window.
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