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# Mounting the filesystem
:~$ sudo guestfish

Welcome to guestfish, the guest filesystem shell for
editing virtual machine filesystems and disk images.

Type: 'help' for help on commands
      'man' to read the manual
      'quit' to quit the shell

><fs> add <path to image>
><fs> run
><fs> list-filesystems 
/dev/sda1: ext4
><fs> mount /dev/sda1 /

# Editing a file
><fs> vi /etc/fstab

#Copying in a file from outside the image
><fs> copy-in <file outside the image> <pat to where to put it inside image>

# Commiting and exiting guestfish. Exit does both
><fs> exit

Change existing images

Creating Windows Images

Cloudbase.it provides tools for creating OpenStack-ready cloud images. They've created a Windows Server 2012R2 images, which is ready for use (download and instructions here). This image is already imported into our environment.

If you need an another Windows Version, you must build the image yourself, with good help from the automated cloudbase-scripts. It is recommended to create the image on a Windows 10 host or VM. The following examples is a list of what we did to create a cloud ready Windows 10 image.

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1. UnattendTemplate.xml: Change InputLocale and UserLocale from en-US to nb-NO

2. Added ntnu_wallpaper.png to the UnattendResources-folder
3. UnattendResources\Specialize.ps1:
   1. Change the line with Wallpaper.png to ntnu_wallpaper.png (do not change the destination filename in the copy-command, as the wallpaper is set through an imported local GPO)
4. UnattendResources\Logon.ps1:
   1. Add the following to commands: netsh advfirewall firewall add rule name="All ICMP V4" protocol=icmpv4:any,any dir=in action=allow and netsh advfirewall firewall add rule name="All ICMP V6" protocol=icmpv6:any,any dir=in action=allow

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Import-Module .\windows-openstack-imaging-tools-master\WinImageBuilder.psm1
$virtualDiskPath = "C:\path\to\diskfile.raw"
$wimFilePath     = "<windowsiso-mountpoint>\sources\install.wim>"
$virtIOISOPath   = "C:\path\to\virtio-win-x.x.xxx.iso"
$images = Get-WimFileImagesInfo -WimFilePath $wimFilePath
$image = $images[0]
New-WindowsCloudImage -WimFilePath $wimFilePath -ImageName $image.ImageName -VirtualDiskFormat RAW -VirtualDiskPath $virtualDiskPath -SizeBytes 18GB -VirtIOISOPath $virtIOISOPath -InstallUpdates

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You now have a .raw diskfile, which contains a Windows 10-installation that will automatically run sysprep once booted. Now you have to choices:

1. Import the .raw file to glance (see Upload new images), and spawn an instance from the new image
2. Create a new local KVM-vm (on a Linux host), be sure to choose a virtio NIC, attach the .raw-file, boot the VM

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When you spawn a Windows instance, be sure to attach a keypair. Cloudbase-init will generate a random password for the user Admin, which can be retrieved with:

nova get-password <instance-id> <private-key-file>

NOTE: There is a known issue with Windows 10 - the hostname will not be set to wahtever you chose for instance name. This might be fixed in the future... (Link)