Hi, Raj
This is also not currently possible, and I'm not sure if it should be.
This is a rather dangerous feature to implement, as it allows the users
to easily break their VMs and cause inconsistencies with ACS's DB. You
could change the VM's status and/or configuration without ACS's
knowledge and this would definitely lead to issues down the line.
Generally speaking it is not advised to execute custom commands directly
to the hypervisor, as it comes with the risks that I just mentioned.
It is safer to have your use case implemented into ACS and let the
platform deal with the hypervisors and keep track of the relevant metadata.
Best regards,
João Jandre.
On 3/10/25 10:57, P, Rajasekar wrote:
Hello Apache CloudStack Community,
Thank you, João Jandre , for your quick response.
I wanted to let you know that I have submitted a feature request here:
https://github.com/apache/cloudstack/issues/10534
I also have one additional query: Is there a way to run an arbitrary command on
the KVM host using the Apache Cloud Stack interface?
In other words - Can I run my own custom commands on the KVM host (for example,
using libvirt functions) via CloudStack? This may be suffice for now to perform
the quiesce and unquiesce ops.
Thanks,
Raj.
-----Original Message-----
From: João Jandre <j...@apache.org>
Sent: 07 March 2025 18:11
To: users@cloudstack.apache.org
Subject: Re: API Support for Quiescing/Unquiescing Running VMs
EXTERNAL EMAIL - USE CAUTION when clicking links or attachments
Hello, Raj
There currently is no API to quiesce/unquiesce a VM. As you mentioned, there
are a few snapshot APIs that enable users to do it, but it is done alongside
the snapshot process.
Since libvirt has APIs specifically to freeze/thaw a VM's filesystem (see
https://urldefense.com/v3/__https://libvirt.org/html/libvirt-libvirt-domain.html*virDomainFSFreeze__;Iw!!Nhn8V6BzJA!XHLVp2Jz11lhI4cx2O7DmFbdemZMtyMSgha0_cHdTB5Qt9OC-HkQ94aDKkp29p-n9bPPsdIkXGm4ag$
), this should not be too hard to implement for KVM. I'm not sure about Xen or
VMware though.
You could raise an issue on the Github to request this feature. Also, I believe
that there is still to apply your idea to GSoC.
Best regards,
João Jandre.
On 3/7/25 08:41, Rajasekar P wrote:
Hello Apache CloudStack Community,
I am currently working with Apache CloudStack version 4.20 and need
some clarification regarding controlling the quiesced state of a running VM.
Specifically, I'm looking for a way to:
1. Quiesce a VM (i.e., flush filesystem activity or pause relevant
operations) without stopping it.
2. Later, unquiesce the VM to resume its normal operations.
I’m not referring to snapshot-related operations, which internally
Queisce and UnQuiesce, rather a standalone feature to manage the
quiesced state of a VM for purposes of storage vendor based backup procedures.
Could you please let me know if there is any API support for directly
quiescing and unquiescing VMs, or if there is a recommended best
practice to achieve this functionality using Apache CloudStack API?
Thank you for your assistance.
Best regards,
Raj.
