HostVersion

HostVersion is a metadata identifier used in computing to denote the version of a host component, such as a server agent, virtualization host, or node participating in a distributed system. It is employed to communicate compatibility information between hosts and other entities, including clients, controllers, or orchestration systems. The exact definition and placement of HostVersion vary by project, but it is commonly included in handshake messages, configuration manifests, or monitoring payloads to aid in capability negotiation and debugging.

Format and scope: In most implementations HostVersion follows semantic versioning, represented as MAJOR.MINOR.PATCH, with optional pre-release or build metadata. Some deployments append environment or architecture tags (for example 2.5.0-prod-amd64). The meaning of the version is defined by the host software and may reflect update history, feature sets, or protocol compatibility.

Purpose and usage: During initialization or reconfiguration, a client or controller reports its HostVersion to verify that the host can support required features. If a host reports an older version, the other party may downgrade features, propose an upgrade, or abort the interaction to avoid incompatibility.

Impact on governance: HostVersion helps maintain compatibility across components, supports diagnostics, and enables phased feature rollouts. It is often accompanied by a compatibility matrix that documents supported version ranges and required dependencies.

Security and reliability: Exposing version information can aid attackers, so systems may limit disclosure or sanitize versions. Validation, secure transport, and integrity checks are recommended to prevent spoofing or tampering.

See also semantic versioning and version negotiation.