Test driving OpenNebula.. unable to figure out how to convert a VM from vCenter

Product Support Installation & Configuration
1

So Im taking a look at Open nebula as a potential replacement for Vmware. I have downloaded MiniOne and have it all setup. I also grabbed OneSwap and have configured the config.yaml file with the info needed to connect to vcenter.

I can display Datacenters and VMs and the next step was to try to migrate one to Opennebula. However, I’m finding information hard to come by.

Number 1; There aren’t many examples of the cli syntax in the OneSwap repos/wiki.

Number 2; I’ve been unable to find any recent posts here in the forums related to migrating/converting from vmware.

So I’d like to ask, I am using this command string:

oneswap convert ‘opentelemetrytest’ --vddk /home/user/vmware-vix-disklib-distrib/

And it returns this:

Downloading disks from vCenter storage to local disk
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:–:-- --:–:-- --:–:-- 0
curl: (22) The requested URL returned error: 404
Deleting password files.
Delete not enabled, leaving disks in /tmp/opentelemetrytest/conversions
Delete not enabled, leaving /tmp/opentelemetrytest alone.
download failed

I have the vcenter url (vcenter.domain.com), as well as a vuser and vpass defined in config.yaml. But as a test I supplied all of those on the CLI, to no avail. I tried adding –verbose too, but I get no more content returned.

I’ve also tried directly to ESXI which also did not work. I am running everyone from one new Ubuntu 24 host with both OneSwap and open nebula installed.

Google results say to try using –skip-prechecks however that switch doesn’t seem to exist anymore. I have been unable to find info regarding what it’s trying to curl.

Can anyone help?

2

Hello @skeer

It looks like you hit an issue with oneswap failing with a 404 when trying to convert a VM from vCenter. That usually points to an auth or URL resolution problem on the vCenter side rather than a disk/transfer issue.

Some suggestions, while our engineers are trying to replicate the issue:

  • Check if the OpenNebula host connects with the vCenter API you configured:
    curl -k -u 'VCENTER_USER:VCENTER_PASS' https://<vcenter-host>/rest
    (if you get the 404, please check hostname, port and that there’s no proxy).
  • Make sure vCenter has enough privileges:
    curl -k -u 'VCENTER_USER:VCENTER_PASS' https://<vcenter-host>/sdk
  • Run your conversion again with verbosity enabled:
    oneswap --verbose convert <vm-id> ...
  • Confirm vCenter version compatibility
  • Check the logs and share it here if possible:
    /var/log/one/oned.log and /var/log/one/oneswap.log

I already passed this issue to our engineer team, and hopefully they could give you a more detailed answer.

Cheers,

3

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