Gravity

Gravity is a lightweight network services suite that provides fully-replicated DNS, DHCP and TFTP functionality with built-in ad‑blocking and a web UI/API for management. It is designed for small to medium networks and multi-site deployments where replicated state and ease of migration matter.

Key Features

• Fully-replicated configuration and runtime data across cluster members (replication/backing store is used to synchronize state).
• DNS server with local caching and configurable ad/privacy blocking; can operate as a forwarder while maintaining its own records.
• DHCP server with automatic DNS registration and import capabilities for existing Microsoft DHCP leases/reservations.
• TFTP server for storing device configurations and PXE/netboot workflows.
• Web-based UI and HTTP API for management and automation.
• Metrics exposed for Prometheus; bundled dashboards/visualizations are supported for observability.
• Backup role supporting snapshot export to S3-compatible storage and local snapshots.
• Provided as container images and can be deployed with Docker Compose or container runtimes.

Use Cases

• Replace or consolidate DNS/DHCP/TFTP services for small office or branch networks with a single, replicated platform.
• Multi-site deployments that require synchronized DNS/DHCP state without external databases or complex primary/secondary setups.
• Air-gapped or regulated environments where cluster images and bundled artifacts simplify migration and offline installs.

Limitations and Considerations

• Minimum recommended resources are modest but non-trivial (examples note at least 1 CPU core and ~1 GB RAM); resource needs grow with many DNS zones or when Blocky/CoreDNS ad‑blocking is enabled.
• Official support targets AMD64 and ARM64 builds; other CPU architectures are not guaranteed.
• Performance and memory usage can increase significantly with large numbers of zones or very high query/lease volumes; plan capacity accordingly.

Gravity provides a compact, self-contained alternative for replicated network services with observability and backup integrations. It focuses on operational simplicity for multi-node and multi-site scenarios while exposing management APIs for automation.