Upgrade to XenServer 7.4

A complete guide on how to upgrade to Citrix XenServer 7.4

Upgrade to XenServer 7.4

XenServer 7.4 is now available. Let's see how to upgrade (or update!) it.

Some free features are removed since 7.3. Please read this before upgrading.

Xen Orchestra is 100% compatible with XenServer 7.4!

From XenServer 7.3

If you are running XenServer 7.2, the process will be only an update, not an upgrade.

WARNING: whatever solution you use (XO or xe), the update process takes a while (15min+ per host), because there is a lot of RPMs packages to upgrade in this pack. DO NOT RESTART TOOLSTACK OR HOSTS DURING THE PROCESS.

Via Xen Orchestra

Download the pack here (Update ISO) and save it on your PC.

Go into the Home/pool view and select the pool you want to update:


Go into the "Advanced" tab and click on "Browse file" in the "Install supplemental pack on every host", then select the file you downloaded earlier:


Now, you have to wait for a while. See the "Monitor update process" section below to see what's happening on your host. While there is a update task in the "Task" view, DO NOT reboot or restart toolstack on your host:


When there is no pool_update.apply task left, you can reboot the hosts to have all updates validated. You can do it later, but it's recommended to do it ASAP.

Via XE cli

You need to download the update "pack". You can do it directly from your pool master. Grab it from itrix website, copy it on your pool master.

Then, still on your pool master, you can upload the update on the storage of your choice (even not shared):

$ xe update-upload file-name=XenServer-7.4.0-update.iso sr-uuid=<ANY_SR_UUID>

This will return the patch UUID. Keep it in your pastebin.

Now, we'll apply the update on all hosts

$ xe update-pool-apply uuid=<PREVIOUS_UUID_RETURNED>

Finally, keep in mind this command can take up to half an hour.

Monitor update process

Because it's very long, it could be hard to tell what's going on. But you can actually check what's happening:

# tail -f /var/log/yum.log 
Dec 15 12:59:37 Updated: vendor-update-keys-1.3.3-2.noarch
Dec 15 12:59:38 Updated: bugtool-conn-tests-1.1.7-1.noarch
Dec 15 12:59:39 Installed: update-XS73-1.0-1.noarch
Dec 15 13:01:17 Erased: control-XS72E012-1.0-1.noarch
Dec 15 13:01:18 Erased: update-XS72E012-1.0-1.noarch
Dec 15 13:01:19 Erased: control-XS72E010-1.0-1.noarch
Dec 15 13:01:20 Erased: control-XS72E005-1.0-1.noarch
Dec 15 13:01:20 Erased: update-XS72E005-1.0-1.noarch
Dec 15 13:01:23 Erased: kpatch-modules-0.3.2-4.x86_64
Dec 15 13:01:23 Erased: kpatch-4.4.0+10-modules-0.3.2-4.x86_64

From older XenServer

This is the standard upgrade procedure. You can upgrade your previous XenServer version directly to 7.4 since XenServer 6.2, 6.5, 7.0, 7.1 and 7.2.

If you are using XenServer 7.3, please read the previous section.

ISO download

You can fetch the ISO here: https://www.citrix.com/downloads/xenserver/product-software/xenserver-74-free-edition.html

The ISO can be burn to a CD but see the next section for USB install.

Install from USB

From any Unix/Linux:

dd if=XenServer-7.4.0-install-cd.iso of=/dev/sdX bs=8M status=progress oflag=direct

Replace sdX with the name of your USB key.

On Windows, use a dedicated program that can write ISO to USB drives.


It's exactly the same as all previous XenServer 7.x version (see our previous blog post: upgrade to XenServer 7.1):

  • / (root) 18GB
  • /boot/efi 512M
  • /var/log 4GB
  • Swap 1GB

Are you upgrading from an older version than XenServer 7.0? Or do you have the old partition scheme? Please follow instructions in our previous blog post to switch to the new one.

Rolling pool upgrade

If you have a pool with multiple hosts, there is some basic rules to follow:

Always upgrade the pool master first:

  1. Migrate VMs from your pool master to slaves
  2. Upgrade the pool master
  3. Migrate VMs from one slave to the pool master
  4. Migrate this slave
  5. Etc.

You can always live migrate VMs from an older XenServer to a newer. The opposite IS NOT POSSIBLE.

Also, always check to empty your VM CD drives and disable HA during the operation.