The environment is largely based on Scientific Linux 6, which is Red Hat compatible. We use KVM as our primary hypervisor, although tests are ongoing with Hyper-V on Windows Server 2008.
We use the Puppet Labs OpenStack modules to configure Compute, Image Service, Identity, and dashboard. Puppet is used widely for instance configuration, and Foreman is used as a GUI for reporting and instance provisioning.
Users and groups are managed through Active Directory and imported into the Identity Service using LDAP. CLIs are available for nova and Euca2ools to do this.
There are three clouds currently running at CERN, totaling about 3,400 compute nodes, with approximately 60,000 cores. The CERN IT cloud aims to expand to 300,000 cores by 2015.
