OpenNebula support is provided by an active community on a best-effort basis.
The first resource to check is the documentation, make sure also to check the specific guides for the storage and virtualization solutions available in your cloud.
The archives for the user mailing list are also a rich source of useful information. You can browse the archive at the mailing lists page.
Subscribe to the mailing list and ask about the problem on there. Please be specific and provide information about your enviroment (OpenNebula version, hypervisor, operating system…). The logs which OpenNebula generates can be a valuable resource when trying to diagnose a problem. You can easily activate them in
The OpenNebula team offers support for the last stable release.