page:guides:axum:database connection

Connect Postgres for Axum

Summary

Database connection for an Axum app on Ample. Verified on Axum: a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time (records=ok). Build and start using the following command:

cargo build --release

This should be run 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.

Prerequisites

A Axum project (use cargo build --release in the rust builder image)
A PostgreSQL driver reading DATABASE_URL at runtime
An Ample account token with servers:write, databases:read permissions

Resource Requirements

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

Workload

Steps to Connect Postgres

Build and start:
```
cargo build --release
```
The server must bind 0.0.0.0 on PORT.
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.
Verify: Fetch the live URL and /p/relational-records on the example; on failure read the build and runtime logs.
```
ample logs --kind build
```

Limitations

Verified on the ubuntu-24.04 template at s-1vcpu-2gb; other sizes and Axum major versions are not verified.
Region and compliance attestations and request-duration limits are unknown.
Managed PostgreSQL 16 only; extensions, connection limits, and backup or restore procedures are not verified.

Cost Estimate

Monthly Amount: $10.00
Components:
- App server: s-1vcpu-1gb, 1.0, $5.00
- Managed PostgreSQL database: s-1vcpu-1gb, 1.0, $5.00

Note: Always-on monthly price of the tested sizes; apps auto-pause when idle.

Success Checks

App responds on its public URL
Relational records check from the example

Evidence Summary

Axum pattern fixture deployed on Ample, with a managed PostgreSQL database auto-provisioned and injected as DATABASE_URL, with real queries succeeding at request time.

Next Actions

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