VelocityNavigator

Lobby routing for Velocity that checks whether a server is actually up before sending anyone to it.

When a player joins or runs /lobby, VelocityNavigator looks at what's responding, how full each lobby is, whether you've flagged it for maintenance or drain, and optionally where the player is connecting from. Then it picks one. If you want to know why it picked what it did, /vn debug player <name> prints the whole trace: which servers were candidates, what filtered them out, and how the winner scored.

The same jar also runs on Paper, Spigot and Folia. Drop it in a backend's plugins/ folder and you get NPCs, inventory menus and PlaceholderAPI values there too. There's no separate bridge plugin to install.

Most networks will use about a third of what's in here. Routing and the selector menus are the core. Parties, queues, the login system, the web dashboard and Redis clustering are all off by default and can stay that way.

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Routing modes

Set selection_mode in navigator.toml:

Mode	What it does	Reach for it when
power_of_two	Picks two lobbies at random, sends the player to whichever has fewer people	Default. Good general answer, no global locking, no herd effect
least_players	Always the emptiest lobby	You want load as flat as possible
least_connections	Fewest connections currently in flight	Join rushes after a restart, or when a video drops
weighted_round_robin	Proportional to weights you assign	Mixed hardware. Give the 64 GB box 3x the weight of the 8 GB VPS
consistent_hash	Ketama ring with virtual nodes, so a UUID lands on the same lobby every time	You want placement to be predictable, and only a slice of players to move when a server joins or leaves the pool
latency / ping	Lowest round-trip time	Backends sitting in different regions
geo	Country and continent codes	Regional clusters. Reads MaxMind GeoLite2, IP-API, or GeoRestrict
round_robin	Strict cycle through healthy lobbies	You want it boring and predictable
random	Any healthy lobby	You want it boring and unpredictable

Sticky sessions. Players go back to the lobby they were in last time, within a window you set. State is written atomically to disk so it survives proxy restarts, and it's skipped automatically when the preferred lobby is full, draining or under maintenance. Turn it off if you'd rather rebalance every join.

When a backend goes down

Every server gets its own circuit breaker. Enough failed pings or connections in a row and it trips open, so players stop being routed there instead of staring at a timeout screen. After a cooldown it goes half-open and tries a canary connection before letting real traffic back in.

Reconnect attempts back off exponentially with jitter, so a server that just came back doesn't immediately get hit by everyone at once.

Health state is assembled from several sources: active pings, TCP socket checks, MOTD queries, and heartbeats from the backend bridge if you've put the jar there.

/vn drain <server> stops new joins and /lobby transfers to a server without kicking anyone already on it. Wait for it to empty, then do your maintenance. If every lobby in a pool is unreachable, players get a fallback server or a readable disconnect message, whichever you configured.

Server selector

Three front-ends, one config. You define display_name, description, menu_order and show_in_menu once per server and all three pick it up.

Java chest GUI. 1 to 6 rows, paginated. Separate material, name and lore for open / full / draining / maintenance / offline, so a dead lobby doesn't look identical to a healthy one. Counts refresh on a timer while the menu is open. Clicks are validated against a token so slots can't be spoofed.

Bedrock forms. Native Floodgate dialogs rather than a chest menu pretending to work on touch controls. Shows names, live counts, descriptions and icons, and connects straight from the button press.

Chat selector. MiniMessage-formatted list with hover tooltips and click-to-connect. Works anywhere, needs no GUI.

The backend half

Copy the same jar onto Paper, Spigot or Folia and you get:

Packet NPCs. No NMS, no Citizens, no version-locked code. Works from 1.16.5 through 26.3 and on Folia. Skins by username or raw Mojang texture properties. Click actions can connect to a server, open a menu, or run a command on either side. Managed in-game:

/vn npc create <id> <name>
/vn npc skin <id> <player>
/vn npc delete <id>

YAML menus. Drop files in plugins/VelocityNavigator/menus/. Slots, materials, custom model data, skull owners, sounds. Actions can transfer, run commands, broadcast, open a submenu, paginate or close.

Placeholders. %velocitynavigator_lobby%, %velocitynavigator_party_leader%, %velocitynavigator_party_size%, %velocitynavigator_server_status_<server>%, %velocitynavigator_queue_position%.

Optional systems

Everything below is disabled until you enable it.

Queue. When every routable lobby is full, players wait in a holding server instead of being turned away. Position and estimated wait show on the actionbar and title. velocitynavigator.queue.priority lets VIPs and staff skip.

Parties. /party create, invite, join, leave, kick, disband, plus /party chat. When the leader moves, online members move with them. Works across proxies if Redis is on.

Maintenance. Lock the whole network or one backend (/vn maintenance set <server> true). Custom MiniMessage kick reason, bypass permission for staff, and a MOTD badge so people know before they try to connect.

Multi-proxy via Redis. Circuit trips and health snapshots sync between proxy nodes in milliseconds. Sticky sessions follow players regardless of which proxy they hit. Backends can register themselves over pub/sub on boot and unregister on shutdown, so you're not editing proxy config every time you add a server. Auth and per-network channel prefixes supported.

Login system. Argon2id with configurable memory cost, iterations and parallelism, and verification fallback for existing SHA-256 databases. Unauthenticated players are held in a quarantine lobby with movement, interaction, inventory and chat blocked until they finish /login or /register. Bedrock players get a native form instead of typing a password into open chat. Sessions persist across quick reconnects for a TTL you set.

Dashboard and metrics

There's a small built-in web dashboard on its own port, behind a bearer token. Lobby table with counts, capacity, latency and circuit state, plus routing distribution charts and sticky session counters.

A /metrics endpoint exports Prometheus format out of the box (routing counts, circuit trips, health check latency, party count, queue depth) if you'd rather watch it in Grafana.

MOTD rotation is in here too: random, sequential or scheduled by time window, with player counts, gradients and maintenance lines.

Two commands worth knowing before you go live:

• /vn config validate checks your config for syntax and semantic problems, and suggests corrections for likely typos
• /vn menu validate catches bad slots, unknown materials, duplicate keys and broken placeholders before a player finds them

Languages

Fifteen bundled: en es de fr ru pt_br zh_cn ja ko it nl pl tr ar hi

Add your own .properties file to plugins/velocitynavigator/languages/ and reload. No rebuild needed.

Storage

JSON files, SQLite, MySQL/MariaDB (HikariCP pooling, automatic schema migrations), or PostgreSQL. Holds player data, sticky sessions and auth credentials. Start on SQLite and move later if you outgrow it.

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Setup

1. Put VelocityNavigator-4.5.1.jar in your Velocity plugins/ folder.
2. Start the proxy once to generate configs, then stop it.
3. Open plugins/velocitynavigator/navigator.toml and list your lobbies. Names must match velocity.toml:

[routing]
selection_mode = "power_of_two"
balance_initial_join = true
default_lobbies = ["lobby-1", "lobby-2", "lobby-3"]

[routing.fallback]
strategy = "disconnect"
message = "<red>All lobbies are currently full or undergoing maintenance.</red>"

[health]
check_interval_seconds = 5
timeout_millis = 2000
circuit_breaker_threshold = 3
circuit_breaker_reset_seconds = 30

1. Run /vn config validate from console.
2. Start up and try /lobby.

If you want NPCs, YAML menus or the Java selector on your backends, copy the same jar into each backend's plugins/ folder. Nothing else to configure on the proxy side.

Commands

Command	Permission	Description
/lobby, /hub	configurable	Route to the best available lobby
/lobby menu	configurable	Open the server selector
/party	configurable	Party management
/vn health	velocitynavigator.admin	Proxy diagnostics and circuit overview
/vn servers	velocitynavigator.admin	Health, capacity, drain and circuit state per server
/vn debug player <player>	velocitynavigator.admin	Explain a routing decision
/vn drain <server>	velocitynavigator.admin	Stop new joins without kicking anyone
/vn maintenance [server] [on/off]	velocitynavigator.admin	Network or per-server maintenance
/vn affinity clean	velocitynavigator.admin	Purge expired sticky sessions
/vn bridge status	velocitynavigator.admin	Show connected backend bridges
/vn config validate	velocitynavigator.admin	Check configs
/vn menu validate	velocitynavigator.admin	Check menus
/vn reload	velocitynavigator.admin	Reload configs, menus and languages

Compatibility

Proxy: Velocity 3.4.x (Java 17+), 3.5.x (Java 21+), 4.0.0 (Java 25)

Backend (optional): Paper, Spigot and Folia, 1.16.5 through 26.3

Works with: GeyserMC + Floodgate, PlaceholderAPI, GeoRestrict, MaxMind GeoLite2, Prometheus, Grafana

Links

• Wiki and documentation
• Issue tracker
• Discord
• demonz.org

Found a bug or want something changed? Open an issue or come argue about it in Discord. Feature requests that come with a use case get built first.

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