You can install or upgrade vCenter Single Sign-On in a basic, high availability, or multisite deployment.

To understand the Single Sign-On basic, high availability, and multisite deployment options, see vCenter Single Sign-On Deployment Modes.

Alternatively, you can install vCenter Single Sign-On, vCenter Inventory Service, and vCenter Server together on a single host machine using the vCenter Server Simple Install option. This option is appropriate for small deployments. See Install vCenter Single Sign On, vCenter Inventory Service, and vCenter Server by Using Simple Install.