Simple virt scripts for daily use (mostly for a developer/test engineer):

- Create unattended Fedora guests using virt-install (RAW/QCOW2)
- Creating JEOS(Just Enough Operating System) with Oz.
- Simple guestfish script to do post install operations.

Eventually try to add more cleaner scripts.

NOTE: To speed up you installs, please change the value of location{1,2} to your nearest Fedora mirrors.

Creating unattended guests

Using virt-install

To create (this uses virt-install) a minimal (@core only) 10G qcow2 disk, 2 vMEM, 2 vCPU, unattended Fedora:

$ git clone \
https://github.com/kashyapc/virt-scripts.git

$ cd virt-scripts

Assuming you want to create a Fedora 23 guest:

$ ./create-guest-qcow2.bash f23-jeos f23 x86_64

Once finished, login using root (passwd: testpwd).

Using Oz

If you want to use Oz (an automated guest install creator w/ minimal user input):

Usage: ./oz-jeos.bash <guest-name> <distro>
        'distro': f20, f23
        Examples: oz-jeos.bash f23-jeos f23       # Create f23

Create a Fedora 23 guest:

$ ./oz-jeos.bash f23-jeos f23

Once installation is finished, define the libvirt XML for the guest (in this case 'f23-jeos'):

$ virsh define $libvirt-XML-FROM-PREVIOUS-COMMAND

List all the guests:

$ virsh list --all

Start it and connect to the guest's serial console:

$ virsh start f23-jeos --console

Or

Connect to it via virt-viewer:

$ virt-viewer f23-jeos

Oz notes

Oz uses something called TDL (template descriptive language). For
example:

     ./stdout-examples/f23/f23.tdl


Contents of the above file:

    -------------
    <template>
      <name>f23-jeos</name>
      <os>
        <name>Fedora</name>
        <version>23</version>
        <arch>x86_64</arch>
        <install type='url'>
          <url>http://dl.fedoraproject.org/pub/fedora/linux/releases/23/Server/x86_64/os/</url>
        </install>
        <rootpw>testpwd</rootpw>
      </os>
      <description>Fedora 23</description>
      <disk>
        <size>10</size>
      </disk>
    </template>
    --------------

To invoke manually, dump the above contents into
'f23.tdl' in the current directory, and do:

    $ oz-install ./f23.tdl

Root password is defined in the <rootpw> attribute of the TDL.