{"catalogRevision":"cat_f13ab9a494120b5e","recipeId":"page:migrate:railway-app:rails","recipeRevision":"r1","canonicalPath":"/migrate/railway-app/rails","label":"Migrate Railway app: Rails","family":"Migration guide","summary":"Move Rails compute from Railway 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 variables from the Railway service (Variables tab or `railway variables`) into an env file kept out of the repository. Not migrated automatically: Railway cron schedules, volumes and private networking are not migrated; persistent data belongs in a managed database, a bucket or an Ample volume. Cutover: Add the custom domain with `ample domain add`, update DNS from the Railway target, keep the Railway service until verified, then remove it. Rollback: keep the source untouched until you confirm; nothing at the source is changed or deleted by this guide.","representativeQueries":["Migrate Railway 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:railway-app","page:migrate:railway-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:railway-app","label":"Railway app","canonicalPath":"/discover/migration/railway-app","kind":"atom"},{"id":"page:migrate:railway-app:rails","label":"Migrate Railway app: Rails","canonicalPath":"/migrate/railway-app/rails","kind":"recipe"}],"parentIds":["migration:railway-app","stack:framework-rails","intent:migrate-compute"],"parents":[{"id":"migration:railway-app","label":"Railway app","canonicalPath":"/discover/migration/railway-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":"Railway app","releaseStatus":"published","supportStatus":"verified","executionStatus":"unbound","docsOnly":true,"prerequisites":["Authorized access to the Railway 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 Railway app provides beyond the component you are moving. Out of scope here: Railway cron schedules, volumes and private networking are not migrated; persistent data belongs in a managed database, a bucket or an Ample volume."},{"title":"Source step 1","body":"Export variables from the Railway service (Variables tab or `railway variables`) into an env file kept out of the repository"},{"title":"Source step 2","body":"Translate `railway.json`/Nixpacks settings into the repository's build and start commands; Ample detects Node and Python builds itself"},{"title":"Source step 3","body":"Note Railway-only features in use: cron schedules, volumes, private networking, templates"},{"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 Railway target, keep the Railway service until verified, then remove it."},{"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 Railway 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: Railway cron schedules, volumes and private networking are not migrated; persistent data belongs in a managed database, a bucket or an Ample volume.","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 752d2a7584688a5d233b2c53d38307d289b04d3e","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 Railway 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/railway-app/rails","markdown":"https://ample.computer/migrate/railway-app/rails.md","json":"https://api.ample.computer/v1/catalog/recipes/page%3Amigrate%3Arailway-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 Railway app: Rails"}},"requiresAuthentication":false,"requiresApproval":false},{"actionId":"plan:page:migrate:railway-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:railway-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:railway-app","label":"Browse Railway app","operationId":"browse_node","method":"GET","relativePath":"/v1/catalog/nodes/migration%3Arailway-app","origin":"api","parameters":{"nodeId":"migration:railway-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}]}