## The short version

Deploy an AI chat application built with Axum on Ample using the durable job state pattern. Compute runs the app in an isolated microVM behind a public HTTPS URL, a managed PostgreSQL 16 database is auto-provisioned and injected as DATABASE\_URL.

## WHAT WAS VERIFIED

Verified on Axum: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true).

## INFRASTRUCTURE

### What it needs

- [Compute](/content/discover/primitive/compute/index.html): verified (Apps run in isolated x86\_64 Firecracker microVMs; sizes are the priced VM sizes.)
- [Postgres](/content/discover/primitive/postgres/index.html): verified (Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE\_URL is supplied.)

## PREREQUISITES

### Before you start

- An Axum project that builds and starts with the documented commands (cargo build --release in the rust builder image (stable toolchain, Cargo.lock committed, pure-Rust dependencies), then the release binary on the ubuntu-24.04 template reading PORT and DATABASE\_URL)
- A PostgreSQL driver reading DATABASE\_URL at runtime (auto-provisioned when omitted, or supplied with --env)
- An Ample account token with servers:write, databases:read

## STEP BY STEP

### How to do it

1. 1

### Build and start

cargo build --release in the rust builder image (stable toolchain, Cargo.lock committed, pure-Rust dependencies), then the release binary on the ubuntu-24.04 template reading PORT and DATABASE\_URL. The server must bind 0.0.0.0 on PORT.

2. 2

### Implement the pattern on PostgreSQL

The fixture's module implements durable job state: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). Copy the approach into your schema; keep migrations idempotent and run them with --release-command.

3. 3

### Deploy

Run the synchronous deploy once and read the result (exit 0 live, 1 failed, 2 blocked). Re-running with no change is a no-op.

```sh
ample deploy . --name <app-name> --public
```

4. 4

### Verify

Fetch the live URL and the pattern self-test route(s) (/p/durable-job-state) from the example; then run your own checks. On failure read `ample logs <deployment_id> --kind build` then `--kind runtime`.

```sh
ample logs <deployment_id> --kind build
```

## EXAMPLES

### Tested examples

- **Axum pattern fixture** (`tests/deploy-canaries/axum-patterns`): Multi-pattern Axum app whose durable job state module was checked live; the module is under tests/deploy-canaries/_pattern-modules.

## SUCCESS CHECKS

### How to know it worked

- app responds on its public URL (`/` on the live URL, expect ample canary axum patterns)
- durable-job-state self-test (`/p/durable-job-state` on the live URL, expect job=done attempts=1 idempotent=true)

## COST

### Cost estimate

Estimated 10.00 USD per month (size prices from pricing.toml at build revision ca0b484a7a9957c573a88d3a32dc603c3c10135a).

- app server x1 `s-1vcpu-1gb`: 5.00 USD
- managed PostgreSQL database x1 `s-1vcpu-1gb`: 5.00 USD

Upper-bound monthly price of the tested sizes. Buckets are allocation-priced per quota and not included.

## EVIDENCE

### Verification evidence

- canary\_run on 2026-09-21T02:46:37Z at revision `1d28ae0 (CLI 0.1.21)`: Axum pattern fixture deployed on Ample (cargo build --release in the rust builder image (stable toolchain, Cargo.lock committed, pure-Rust dependencies), then the release binary on the ubuntu-24.04 template reading PORT and DATABASE\_URL); checks passed for durable-job-state and configuration-secrets. Pattern proof: a jobs table with a state and attempts counter, processing inside a row-locked transaction, and a second run that is a no-op (job=done attempts=1 idempotent=true). (expires 2027-03-20T02:46:37Z)
- canary\_run on 2026-09-21T02:46:37Z at revision `1d28ae0 (CLI 0.1.21)`: The same Axum app deployed with a --release-command migration; the marker it created was readable after activation. (expires 2027-03-20T02:46:37Z)

## EXECUTION

### Execution binding

MCP tool `ample_deploy` (registry `mcp:ample_deploy`), schema hash `876465fce906da0c` observed 2026-09-22T00:31:22.774679+00:00 at revision `e6446ceea69b`. Binding state at export: schema\_changed. Required scopes: servers:write, databases:read.

## NEXT ACTIONS

### Typed next actions

- Browse the catalog index (`GET /v1/catalog` on the api origin; authentication not required, approval not required)
- Search published recipes by intent, stack and constraints (`POST /v1/catalog/search` on the api origin; authentication not required, approval not required)
- Prepare a side-effect-free deployment plan for an authorized project (`POST /v1/catalog/plan` on the api origin; authentication required, approval not required)
- Read the existing agent authentication setup (`GET /mcp/setup` on the api origin; authentication not required, approval not required)
- Browse AI chat application (`GET /v1/catalog/nodes/workload%3Aai-chat-application` on the api origin; authentication not required, approval not required)
- Browse Axum (`GET /v1/catalog/nodes/stack%3Aframework-axum` on the api origin; authentication not required, approval not required)
- Browse Durable job state (`GET /v1/catalog/nodes/pattern%3Adurable-job-state` on the api origin; authentication not required, approval not required)
- Browse Deploy AI app (`GET /v1/catalog/nodes/intent%3Adeploy-ai-app` on the api origin; authentication not required, approval not required)

## ABOUT THIS RECIPE

### Identifiers and status

Recipe `page:recipes:ai-chat-application:axum:persistent-state`. Revision r1.

release **published** support **verified** execution **blocked (schema\_changed: live tool schema differs from the recorded binding)**

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