{"catalogRevision":"cat_f13ab9a494120b5e","recipeId":"page:migrate:heroku-app:rails","recipeRevision":"r1","canonicalPath":"/migrate/heroku-app/rails","label":"Migrate Heroku app: Rails","family":"Migration guide","summary":"Move Rails compute from Heroku app to Ample, one component at a time. Destination verified on Ample: the app built, started and answered on its public HTTPS URL with encrypted configuration delivered. Source procedure: Export config vars with `heroku config -s -a <app>` into an env file kept out of the repository. Not migrated automatically: Heroku add-ons other than Postgres, release-phase scheduling, dyno autoscaling and Heroku Scheduler are not migrated; use `--release-command` for release tasks. Cutover: Add the custom domain with `ample domain add`, update DNS from the Heroku DNS target, keep the Heroku app until verified, then scale it down. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide.","representativeQueries":["Migrate Heroku app: Rails","Where can I host Rails built with Rails?","I need a component-scoped export/import or reconfiguration procedure for Rails, with compatibility checks, verification and rollback."],"breadcrumbIds":["discovery","migration","migration:compute-sources","migration:heroku-app","page:migrate:heroku-app:rails"],"breadcrumbs":[{"id":"discovery","label":"Agent hosting discovery","canonicalPath":"/discover/discovery","kind":"root"},{"id":"migration","label":"Migration sources by component","canonicalPath":"/discover/migration","kind":"facet"},{"id":"migration:compute-sources","label":"Compute sources","canonicalPath":"/discover/migration/compute-sources","kind":"group"},{"id":"migration:heroku-app","label":"Heroku app","canonicalPath":"/discover/migration/heroku-app","kind":"atom"},{"id":"page:migrate:heroku-app:rails","label":"Migrate Heroku app: Rails","canonicalPath":"/migrate/heroku-app/rails","kind":"recipe"}],"parentIds":["migration:heroku-app","stack:framework-rails","intent:migrate-compute"],"parents":[{"id":"migration:heroku-app","label":"Heroku app","canonicalPath":"/discover/migration/heroku-app","kind":"atom"},{"id":"stack:framework-rails","label":"Rails","canonicalPath":"/discover/stack/framework-rails","kind":"atom"},{"id":"intent:migrate-compute","label":"Migrate compute","canonicalPath":"/discover/intent/migrate-compute","kind":"atom"}],"resourceRequirements":["primitive:compute","primitive:postgres"],"infrastructureRequirements":[{"primitiveId":"primitive:compute","label":"Compute","canonicalPath":"/discover/primitive/compute","status":"verified","summary":"Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes."},{"primitiveId":"primitive:postgres","label":"Postgres","canonicalPath":"/discover/primitive/postgres","status":"verified","summary":"Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied."}],"framework":"Rails","workload":"Rails","migrationSource":"Heroku app","releaseStatus":"published","supportStatus":"verified","executionStatus":"unbound","docsOnly":true,"prerequisites":["Authorized access to the Heroku app source and its export tooling","An inventory of every component in scope and out of scope","A validated backup or copy before any cutover","An Ample account token with servers:write, databases:read"],"testedConfiguration":{"template":"ruby-3.4","runtime":"ruby","size":"s-1vcpu-1gb","install":"bundle config set --local path vendor/bundle && bundle config set --local without 'development test' && bundle install","start":"bundle exec rails server -b 0.0.0.0 -p $PORT"},"inputSchema":null,"outputSchema":null,"workflowSteps":[{"title":"Inventory the source","body":"List what Heroku app provides beyond the component you are moving. Out of scope here: Heroku add-ons other than Postgres, release-phase scheduling, dyno autoscaling and Heroku Scheduler are not migrated; use `--release-command` for release tasks."},{"title":"Source step 1","body":"Export config vars with `heroku config -s -a <app>` into an env file kept out of the repository"},{"title":"Source step 2","body":"Translate the `Procfile` web process into the start command (`--start` or the package manifest's start script); worker processes need a separate `--kind worker` service"},{"title":"Source step 3","body":"Note buildpacks and add-ons in use; managed databases replace Heroku Postgres, other add-ons need their own plan"},{"title":"Deploy on Ample in parallel","body":"bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rails server` reading PORT on the ruby-3.4 template with RAILS_ENV=production. Pass the exported variables with --env; keep the source running.","command":"ample deploy . --name <app-name> --public --env-file .env.production"},{"title":"Validate before cutover","body":"Run the app's own checks and, for data, compare counts and checksums; the example checks are the pattern self-tests (/p/configuration-secrets, /p/relational-records)."},{"title":"Cut over","body":"Add the custom domain with `ample domain add`, update DNS from the Heroku DNS target, keep the Heroku app until verified, then scale it down."},{"title":"Rollback","body":"Point DNS or configuration back to the source. The source was never modified; deletion is a separate, user-executed step after validation."}],"examples":[{"title":"Rails pattern fixture (destination)","description":"Verified destination basis: Rails compute.","sourceRef":"tests/deploy-canaries/rails-patterns"}],"successChecks":[{"description":"destination app responds on its public URL","kind":"http_get","path":"/","expect":"ample canary rails patterns"},{"description":"configuration-secrets check from the destination example","kind":"http_get","path":"/p/configuration-secrets","expect":"see the pattern fixture checks"},{"description":"relational-records check from the destination example","kind":"http_get","path":"/p/relational-records","expect":"see the pattern fixture checks"},{"description":"data or object counts and checksums match the source","kind":"manual","expect":"operator comparison before cutover"}],"limitations":["Documentation only: nothing is executed automatically and no execution binding is offered.","The source-side procedure is documented from Heroku app's standard tooling and was not executed in this catalog's evidence; the destination side was verified with the pattern fixture.","No full source-product parity is claimed: Heroku add-ons other than Postgres, release-phase scheduling, dyno autoscaling and Heroku Scheduler are not migrated; use `--release-command` for release tasks.","Verified on the ruby-3.4 template at s-1vcpu-1gb; region, compliance and request-duration limits are unknown.","Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures on the managed side are not verified beyond the pattern checks."],"costEstimate":{"currency":"USD","monthlyAmount":10.0,"authoritative":true,"basis":"size prices from pricing.toml (loaded by the API) at build revision 7cf090725a6f16dd91af7d28356fe72c1b404d6e","components":[{"name":"app server","size":"s-1vcpu-1gb","quantity":1.0,"monthlyAmount":5.0},{"name":"managed PostgreSQL database","size":"s-1vcpu-1gb","quantity":1.0,"monthlyAmount":5.0}],"note":"Destination always-on monthly price of the tested sizes; apps auto-pause when idle. Source costs are unknown to Ample."},"evidenceSummary":[{"kind":"canary_run","summary":"Destination side verified: the Rails pattern fixture deployed on Ample (bundle install into vendor/bundle from Gemfile.lock (development and test groups skipped), then Puma via `rails server` reading PORT on the ruby-3.4 template with RAILS_ENV=production) and its checks passed (the app built, started and answered on its public HTTPS URL with encrypted configuration delivered). The source-side export from Heroku app is documented from the vendor's standard tooling and was not executed by this catalog's evidence.","observedAt":"2026-09-20T21:55:28Z","implementationRevision":"4f7cb9813c1f (CLI 4f7cb98)","expiresAt":"2027-03-19T21:55:28Z","scope":{"checks":["/p/configuration-secrets","/p/relational-records"],"destinationOnly":true,"template":"ruby-3.4"}}],"lastVerifiedAt":"2026-09-20T21:55:28Z","mcpBinding":null,"unknowns":["region availability is unknown until a verified region fact is recorded","compliance attestations are unknown; none are claimed"],"formats":{"html":"https://ample.computer/migrate/heroku-app/rails","markdown":"https://ample.computer/migrate/heroku-app/rails.md","json":"https://api.ample.computer/v1/catalog/recipes/page%3Amigrate%3Aheroku-app%3Arails"},"nextActions":[{"actionId":"browse-catalog","label":"Browse the catalog index","operationId":"catalog_index","method":"GET","relativePath":"/v1/catalog","origin":"api","parameters":{},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"search-recipes","label":"Search published recipes by intent, stack and constraints","operationId":"search_recipes","method":"POST","relativePath":"/v1/catalog/search","origin":"api","parameters":{"body":{"limit":5,"query":"Migrate Heroku app: Rails"}},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"plan:page:migrate:heroku-app:rails","label":"Prepare a side-effect-free deployment plan for an authorized project","operationId":"plan_deployment","method":"POST","relativePath":"/v1/catalog/plan","origin":"api","parameters":{"body":{"inputs":{},"projectId":"<workspace or server id you own>","recipeId":"page:migrate:heroku-app:rails","recipeRevision":"r1"}},"requiresAuthentication":true,"requiresApproval":false},{"actionId":"auth-setup","label":"Read the existing agent authentication setup","operationId":"existing_auth_setup","method":"GET","relativePath":"/mcp/setup","origin":"api","parameters":{},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:migration:heroku-app","label":"Browse Heroku app","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/migration%3Aheroku-app","origin":"api","parameters":{"nodeId":"migration:heroku-app"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:stack:framework-rails","label":"Browse Rails","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/stack%3Aframework-rails","origin":"api","parameters":{"nodeId":"stack:framework-rails"},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"browse:intent:migrate-compute","label":"Browse Migrate compute","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/intent%3Amigrate-compute","origin":"api","parameters":{"nodeId":"intent:migrate-compute"},"requiresAuthentication":false,"requiresApproval":false}]}