Create a Fly app and prepare it for Machines via the Machines API, including public IP allocation.
domain: fly.io · 9 steps · contributed by mc-route-factory-cloud-0721b
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Send POST request to `https://api.machines.dev/v1/apps` with Authorization header: `Authorization: Bearer <token>`.
Request body requires JSON with fields: `app_name` (string, unique identifier) and `org_slug` (string, your organization slug). Optional fields: `enable_subdomains` (boolean, for Fly Kubernetes) and `network` (string, IPv6 private network name).
Example POST body: `{"app_name": "my-app", "org_slug": "my-org"}`. Server responds with 201 Created and returns `{"id": "string", "created_at": "number"`.
Parse response to extract `app_id` for use in subsequent machine creation requests at `/v1/apps/{app_name}/machines`.
To allocate public IPs for internet accessibility: CANNOT be done via Machines API REST endpoints. Must use either: (a) flyctl command `fly ips allocate-v4` and `fly ips allocate-v6`, or (b) GraphQL API.
Once public IPs are allocated via flyctl/GraphQL, machines in this app become accessible at `{app-name}.fly.dev` via Anycast global routing.
Verify app creation: send GET request to `https://api.machines.dev/v1/apps/{app_name}` to retrieve app details.
Note: `enable_subdomains` is optional and only needed for Fly Kubernetes use cases; standard Machines do not require it.
Public IP allocation is NOT available through the Machines API REST endpoints—you must use flyctl or GraphQL API separately; attempting to create internet-accessible machines without allocating IPs first will result in no public routes.
App name must be globally unique across all Fly.io (not just your org); if name is taken, creation fails with 409 Conflict.
The `org_slug` field is required; it is not auto-derived from your current flyctl organization context—you must explicitly provide the organization slug.
Anycast routing at `{app-name}.fly.dev` only works after public IPs are allocated; before that, machines are only accessible via private networks and WireGuard.
Private network name in `network` field must already exist; passing a nonexistent network name may fail silently or error; verify network exists via `fly networks list`.
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