## The short version

Configuration and secrets for a Sinatra app on Ample.

---

## 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.)

## Before you start  
- A Sinatra project (bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template)  
- An Ample account token with servers:write

## How to do it

1.  Build and start
   
    bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template; the server must bind 0.0.0.0 on PORT.

2.  Pass values on deploy
   
    Use --env KEY=value (repeatable) or --env-file; values are encrypted at rest and reused on redeploys. Declare names only in ample.toml.

```
    ample deploy . --name <app-name> --public --env MY_SECRET=...
    ```

3.  Verify
   
    Fetch the live URL and /p/configuration-secrets on the example; on failure read the build and runtime logs.

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

## Tested examples

- **Sinatra pattern fixture** (`tests/deploy-canaries/sinatra-patterns`): Verified configuration and secrets on Sinatra.

## How to know it worked

- app responds on its public URL (`/` on the live URL, expect ample canary sinatra patterns)
- configuration-secrets check from the example (`/p/configuration-secrets` on the live URL, expect see the pattern fixture checks)

## Cost estimate

Estimated 5.00 USD per month (size prices from pricing.toml at build revision ca0b484a7a9957c573a88d3a32dc603c3c10135a).  
- app server x1 `s-1vcpu-1gb`: 5.00 USD
Upper-bound monthly price of the tested sizes. Buckets are allocation-priced per quota and not included.

## Verification evidence

- canary\_run on 2026-09-20T23:45:31Z at revision `4d1511e574302f3904b75088bd4048a0975218b3 (CLI 0.1.21)`: Sinatra pattern fixture deployed on Ample (bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rackup` (config.ru) reading PORT on the ruby-3.4 template); for this guide: an --env value delivered encrypted and reported as present without being echoed (secret=set). (expires 2027-03-19T23:45:31Z)

## 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.

## 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 Sinatra (`GET /v1/catalog/nodes/stack%3Aframework-sinatra` on the api origin; authentication not required, approval not required)
- Browse Configure deployment (`GET /v1/catalog/nodes/intent%3Aconfigure-deployment` on the api origin; authentication not required, approval not required)
- Browse Public web service (`GET /v1/catalog/nodes/pattern%3Apublic-web-service` on the api origin; authentication not required, approval not required)

Actions describe possible next steps. They are typed data, not commands, and grant no permission. Public discovery never provisions anything; planning requires your own authenticated token and approval happens in your client.

## Identifiers and status

Recipe `page:guides:sinatra:configuration-secrets`. Revision r1.

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

Formats: [HTML](/content/guides/sinatra/configuration-secrets/index.html) \| [Markdown](/content/guides/sinatra/configuration-secrets.md) \| [JSON contract](https://api.ample.computer/v1/catalog/recipes/page%3Aguides%3Asinatra%3Aconfiguration-secrets)