Xen / XCP / Xenserver in OpenStack Installation

Post install steps

You are now ready to install OpenStack onto your XenServer system. This process involves the following steps:

• For resize and migrate functionality, please perform the changes described in the Configuring Resize section of the OpenStack Compute Administration Manual.
• Install the VIF isolation rules to help prevent mac and ip address spoofing.
• Install the XenAPI plugins - see the next section.
• In order to support AMI type images, you need to set up /boot/guest symlink/directory in Dom0. For detailed instructions, see next section.
• To support resize/migration, set up an ssh trust relation between your XenServer hosts, and ensure /images is properly set up. See next section for more details.
• Create a Paravirtualised virtual machine that can run the OpenStack compute code.
• Install and configure the nova-compute in the above virtual machine.

Ensure you are using the EXT type of storage repository (SR). Features that require access to VHD files (such as copy on write, snapshot and migration) do not work when using the LVM SR. Storage repository (SR) is a XenAPI specific term relating to the physical storage on which virtual disks are stored.

On the XenServer/XCP installation screen, this is selected by choosing "XenDesktop Optimized" option. In case you are using an answer file, make sure you use srtype="ext" within the installation tag of the answer file.

In order to support AMI type images, you need to set up /boot/guest symlink/directory in Dom0.

Prepare for AMI Type Images

    為了讓Xenserver的dom0能夠支援Amazon的VM Image type: AMI，所以必須在dom0建立/boot/guest的資料夾，讓OpenStack能夠從解壓縮開的AMI以及ARI Image中放kernel以及ramdisk到這個資料夾。正常來說這個資料夾是由OpenStack來進行維護的，不會因為power failures 或者意外事故造成一些垃圾檔案充斥在dom0中，所以推薦的作法是做symbolic link。

In order to support AMI type images within your OpenStack installation, a directory /boot/guest needs to be created inside Dom0. The OpenStack VM will put the kernel and ramdisk extracted from the AKI and ARI images to this location.

This directory's content will be maintained by OpenStack, and its size should not increase during normal operation, however in case of power failures or accidental shutdowns, some files might be left over. In order to prevent these files to fill up Dom0's disk, it is recommended to set up this directory as a symlink pointing to a subdirectory of the local SR.

Execute the following commands in Dom0 to achieve the above mentioned setup:

# LOCAL_SR=$(xe sr-list name-label="Local storage" --minimal)
# LOCALPATH="/var/run/sr-mount/$LOCAL_SR/os-guest-kernels"
# mkdir -p "$LOCALPATH"
# ln -s "$LOCALPATH" /boot/guest