<![CDATA[Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities]]>Hi!

As quiesced snapshots are deprecated and RAM-enabled backups require some downtime:

What do you think about the concept of "Pre-Freeze"-scripts through xe-guest-utilities? Would it be possible to have some scripts on the snapshotted system, that are getting executed, when a snapshot is taken?

Example for VMWare:
https://www.veritas.com/support/en_US/article.100009553

Best wishes
KPS

]]>https://xcp-ng.org/forum/topic/6748/pre-freeze-post-thaw-script-with-xe-guest-utilitiesRSS for NodeWed, 15 Apr 2026 06:29:25 GMTThu, 29 Dec 2022 06:55:34 GMT60<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Sat, 04 Feb 2023 10:00:50 GMT]]>@rjt You can customize the hook timeout by adding this setting in your xo-server's config:

[xapiOptions]
# Timeout in milliseconds
syncHookTimeout = 300e3 # 5 minutes
]]>https://xcp-ng.org/forum/post/58311https://xcp-ng.org/forum/post/58311Sat, 04 Feb 2023 10:00:50 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Sat, 04 Feb 2023 07:57:46 GMT]]>@julien-f can answer that question

]]>https://xcp-ng.org/forum/post/58303https://xcp-ng.org/forum/post/58303Sat, 04 Feb 2023 07:57:46 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Fri, 03 Feb 2023 14:29:27 GMT]]>@olivierlambert awesome!

I assume Windows VMs that get their drivers from Windows Update will not have this capability unless we install the simple service:1727.

On github, it says that the the VM service has to respond within 1 minute, but it would take several minutes to backup a database. The blog page says it will wait for answer. Sounds like Vates knows the answer is somewhere in between. We will wait, but only for so long 🙂

Specification

XO will waits for the request to be answered before starting the snapshot, but will not wait longer than 1 minute.

If the request fails for any reason, XO will go ahead with snapshot immediately.

Webhooks for snapshots [beta] says "It's now possible to notify a VM via an HTTP request before a snapshot. Xen Orchestra will wait for an answer before starting the actual snapshot."

]]>https://xcp-ng.org/forum/post/58288https://xcp-ng.org/forum/post/58288Fri, 03 Feb 2023 14:29:27 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Thu, 29 Dec 2022 11:04:17 GMT]]>It's a big effort indeed, this is costing a lot of money 😅

]]>https://xcp-ng.org/forum/post/56564https://xcp-ng.org/forum/post/56564Thu, 29 Dec 2022 11:04:17 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Thu, 29 Dec 2022 11:03:47 GMT]]>@olivierlambert
Sounds great. I would be very happy to see this on Linux and Windows.
Thank you for your effort!

]]>https://xcp-ng.org/forum/post/56563https://xcp-ng.org/forum/post/56563Thu, 29 Dec 2022 11:03:47 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Thu, 29 Dec 2022 11:00:02 GMT]]>That's why we planned to improve the tools (at least on Linux at first) to allow more things to be passed directly to it 🙂

]]>https://xcp-ng.org/forum/post/56562https://xcp-ng.org/forum/post/56562Thu, 29 Dec 2022 11:00:02 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Thu, 29 Dec 2022 09:46:12 GMT]]>@olivierlambert
Thank your for your answer.

About the options:

  • Coherent snapshot: With a pre-freeze-script, it would be 100% possible to bring every system in a consistent state.

  • Webhooks: Can do the same, but are a lot more work than a local script. Especially for windows VMs, I would have to install a webserver, that can trigger scripts.

]]>https://xcp-ng.org/forum/post/56561https://xcp-ng.org/forum/post/56561Thu, 29 Dec 2022 09:46:12 GMT<![CDATA[Reply to Pre-Freeze-/Post-Thaw-Script with xe-guest-utilities on Thu, 29 Dec 2022 09:28:48 GMT]]>Hi,

  1. If you have PV drivers installed in your guests, a snapshot should be coherent anyway (I can at least tell you that's the case on Linux)
  2. There's already a feature we started in XO, see https://xen-orchestra.com/blog/xen-orchestra-5-75/#📸-webhooks-for-snapshots-beta for use of webhooks
]]>https://xcp-ng.org/forum/post/56560https://xcp-ng.org/forum/post/56560Thu, 29 Dec 2022 09:28:48 GMT