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Not open yet. Managed Applications are not open to accounts yet. This page says how Rivet works as it is built, ahead of their opening, and may change before then.
Rivet runs long-lived actors addressed by key: each keeps its state, a SQLite database, a queue and realtime connections, and sleeps when nothing asks for it. An installation of it is one Rivet engine of your own, version 3.0.0 (Apache-2.0), packaged by the platform: your runner (your app, built with RivetKit) and your clients connect to it. Its source is rivet-dev/rivet.
glac install rivet --set disk_gib=20What an installation is made of
| Part | What it is |
|---|---|
The app <name>-engine |
The engine: a stateful Cube service, port 6420, on an instance of its own. It sleeps after idle_seconds without a request, and a request wakes it. |
Its Volume engine/data |
The engine’s disk, at /var/lib/rivet: its log of recent writes and its read cache, 40% of it each. |
Its bucket actors |
The durable copy of every actor’s data, kept by the engine in object storage under a prefix of the installation’s own. |
| Its admin token | Made once at the install, kept as a secret of the project’s; in admin_token and endpoint. |
Parameters
| Parameter | What it is |
|---|---|
size.vcpus |
The engine’s vCPUs at the most: 1 to 8, 1 unless you say. |
size.memory_gib |
Its memory at the most, in GiB: 0.5 to 16, 1 unless you say. |
disk_gib |
Its Volume’s size, in GiB: 2 to 1 024, 10 unless you say. Fixed once it is made. |
idle_seconds |
How long the engine stays awake with no request before it sleeps, in seconds: 10 to 600, 600 unless you say. |
Outputs
| Output | What it is |
|---|---|
url |
The engine’s address, which answers the internet. |
endpoint |
What a runner and a client of RivetKit take as RIVET_ENDPOINT: the address with the admin token in it. Secret. |
admin_token |
The engine’s admin token, for calls that need it (Authorization: Bearer …). Secret. |
private_url |
The engine on the project’s private network: http://<name>-engine.internal:6420, for your apps and your sandboxes on the network. |
The create’s answer has every output; afterwards the secret ones are shown to a key with the admin scope, and in the console.
Using it
Point your runner and your clients at endpoint (or, from the project’s own apps and sandboxes, at private_url with the admin token). Once the engine is first up, the platform makes its default pool of runners (default, in the namespace default), which your runner joins, and the installation is ready once it has: the engine answers its health a little before its storage takes commands, and a call made in between is refused overloaded (retryable). An actor’s state is the engine’s: it writes it to its Volume first, and to its bucket for good, so it outlives the engine’s instance.
Its health through the API
GET /v1/managed/rivet/{installation}/health asks the engine how it is, on its instance (which it wakes), and answers what it said: {"object": "rivet_health", "installation_id": "ins-…", "engine": {"status": "ok", "version": "3.0.0", …}}. While the engine does not answer, it is refused 503 engine_not_ready (retryable). It takes a key with the read scope.
What it costs
What its engine’s instance uses, its Volume and its bucket, at Cube’s prices (what an installation costs). Its calculator says what a month of it comes to at these inputs: 1 vCPU and 1 GiB awake around the clock, its CPU busy 5% of the time, a 10 GB Volume, 1 GB in its bucket, a million requests and 1 GB to the internet:
| Meter | A month |
|---|---|
| CPU | 36 vCPU-hours |
| Memory | 720 GiB-hours |
| Requests | 1 000 000 |
| Volume data | 11 GB-months |
| Volume cache | 10 GB-months |
| Traffic to the internet | 1 GB |
While the engine sleeps it uses no CPU time or memory; what it keeps while it sleeps is billed as any sleeping instance’s.