Connect Postgres for Echo

Summary

Database connection for an Echo app on Ample. Verified on Echo: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok). Build and start: CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build).

Representative Queries

• Connect Postgres for Echo
• Where can I host Connect Postgres built with Echo?
• I need driver setup, connection settings, secret handling and a real connection test.

Resource Requirements

• primitive:compute
• primitive:postgres

Infrastructure Requirements

• Compute
  Managed PostgreSQL 16 runs in its own microVM and is auto-provisioned when an app needs a database and no DATABASE_URL is supplied.
• Postgres
  Apps run in isolated x86_64 Firecracker microVMs that auto-pause when idle and wake on request; sizes are the priced VM sizes.

Prerequisites

1. A Echo project (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build))
2. A PostgreSQL driver reading DATABASE_URL at runtime
3. An Ample account token with servers:write, databases:read

Workflow Steps

1. Build and start
   CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build); the server must bind 0.0.0.0 on PORT.
2. Read DATABASE_URL at runtime
   Open connections from the environment inside handlers or a pool; omit DATABASE_URL to auto-provision a managed database or pass --env DATABASE_URL=... for an existing one.
3. Verify
   Fetch the live URL and /p/relational-records on the example; on failure read the build and runtime logs.
   Command: ample logs --kind build

Examples

Echo pattern fixture

Description: Verified database connection on Echo. Source Ref: tests/deploy-canaries/echo-patterns

Success Checks

• App responds on its public URL
  Kind: http_get
  Path: /
  Expect: ample canary echo patterns
• Relational-records check from the example
  Kind: http_get
  Path: /p/relational-records
  Expect: see the pattern fixture checks

Limitations

• Verified on the ubuntu-24.04 template at s-1vcpu-1gb; other sizes and Echo major versions are not verified.
• Region, compliance attestations and request-duration limits are unknown and not claimed.
• Managed PostgreSQL 16 only; extensions, connection limits and backup or restore procedures are not verified.

Cost Estimate

• Currency: USD
• Monthly Amount: 10.0
• Components:
  • App server, size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0
  • Managed PostgreSQL database, size: s-1vcpu-1gb, quantity: 1.0, monthly amount: 5.0
• Note: Always-on monthly price of the tested sizes; apps auto-pause when idle.

Evidence Summary

• Kind: canary_run
  Summary: Echo pattern fixture deployed on Ample (CGO_ENABLED=0 go build -o app ./... then ./app on the ubuntu-24.04 template (go.sum committed for a reproducible build)); for this guide: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok).
  Observed At: 2026-09-21T02:34:39Z
  Implementation Revision: 1d28ae0-dirty (CLI 0.1.21)
  Expires At: 2027-03-20T02:34:39Z
  Scope:
  • Checks: /p/relational-records
  • Template: ubuntu-24.04