MartinEmrich opened a new issue, #8129:
URL: https://github.com/apache/cloudstack/issues/8129
##### ISSUE TYPE
* Documentation Report
##### COMPONENT NAME
~~~
Documentation, cloud-init
~~~
##### CLOUDSTACK VERSION
~~~
4.18.1.0
~~~
##### CONFIGURATION
Hypervisor: XCP-ng 7.5
##### OS / ENVIRONMENT
VMs: Debian 12
##### SUMMARY
Cloud-init not starting, as datasource _CloudStack_ is not detected.
##### STEPS TO REPRODUCE
- Create VM from Debian 12.2 netinst ISO
- install cloud-init
- configure cloud-init just as for Ubuntu
(http://docs.cloudstack.apache.org/en/4.18.1.0/adminguide/templates/_cloud_init.html)
- prepare cloud-init (`cloud-init clean -l --seed --reboot)
##### EXPECTED RESULTS
_(Assumption: Ubuntu configuration should closely-enough match Debian)_
cloud-init should run and configure the OS.
##### ACTUAL RESULTS
cloud-init does not run at all.
# Additional info:
After some research: (at least on Debian) cloud-init includes a "systemd
generator" using _ds-identify_. That script tries to detect the correct
datasource, but fails. If it does not detect any datasource, it will disable
cloud-init completely, resulting in no cloud-init logs whatsoever.
Looking at the source code, it tries to determine whether it runs on
CloudStack by using the DMI _product_name_ field:
https://github.com/canonical/cloud-init/blob/22.4.x/tools/ds-identify#L739-L743
But on XenServer (I bet on VMWare, Hyper-V, etc, too), this just returns a
generic `HVM domU`. (I suspect the documentation was written only with KVM in
mind, and the Cloudstack Agent for KVM somehow configures KVM to producte that
DMI product_name)
While the _latest_ version
(http://docs.cloudstack.apache.org/en/latest/adminguide/templates/_cloud_init.html)
does not, the _4.18.1.0_ version of the documentation gives a hint for CentOS
(although with a typo):
http://docs.cloudstack.apache.org/en/4.18.1.0/adminguide/templates/_cloud_init.html
Editing the `/etc/cloud/ds-identify.cfg` file to override the datasource
works on Debian 12, too. After adding that file with
````
datasource: CloudStack
````
cloud-init runs as expected.
Additional note: In
https://bugs.launchpad.net/cloud-init/+bug/1892171/comments/4 , at least one
cloud-init developer/contributor marks `ds-identify.cfg` as undocumented,
meaning not a public stable interface.
It looks like the kernel command line is the official way to override the
cloud-init datasource. (Idk though whether this comes from Cloudstack,
especially in the HVM case, or if it has to be configured in the VM bootloader
by the image author)
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