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This topic covers HGS prerequisites and initial steps to prepare for the HGS deployment.
Prerequisites
Hardware: HGS can be run on physical or virtual machines, but physical machines are recommended.
If you want to run HGS as a three-node physical cluster (for availability), you must have three physical servers. (As a best practice for clustering, the three servers should have very similar hardware.)
Operating system: Host key attestation requires Windows Server 2019 Standard or Datacenter edition operating with v2 attestation. For TPM-based attestation, HGS can run Windows Server 2019 or Windows Server 2016, Standard or Datacenter edition.
Server Roles: Host Guardian Service and supporting server roles.
Configuration permissions/privileges for the fabric (host) ___domain: You will need to configure DNS forwarding between the fabric (host) ___domain and the HGS ___domain.
Upgrading HGS
If you've already deployed HGS and want to upgrade its operating system, follow the upgrade guidance to upgrade your HGS and Hyper-V servers to the latest OS.