Does PlanetScale Work With Docker?
Yes, PlanetScale works seamlessly with Docker—your app container connects to PlanetScale's serverless MySQL database exactly like any other remote MySQL instance.
Quick Facts
How PlanetScale Works With Docker
PlanetScale is a remote, managed MySQL database service, so Docker containers connect to it via standard MySQL connection strings over the network—no special integration needed. You build a Docker image containing your application code, include a MySQL client library (like `mysql2` for Node.js or `PyMySQL` for Python), and pass PlanetScale connection credentials as environment variables at runtime. The typical architecture has your containerized app in Docker Desktop, Docker Compose, Kubernetes, or any container orchestrator connecting to PlanetScale's hosted endpoints.
The developer experience is straightforward: generate a password in PlanetScale's dashboard, store it as a Docker secret or environment variable, and connect like you would to any MySQL database. PlanetScale's branching feature (dev, staging, production branches) integrates nicely with Docker—you can run different container instances pointing to different PlanetScale branches during development and CI/CD. The main consideration is network latency; if your container and PlanetScale are in different regions, you may notice slightly higher latency than local databases, but this is usually acceptable for most applications.
Best Use Cases
Docker + PlanetScale Node.js App
npm install mysql2/promise dotenv// app.ts
import mysql from 'mysql2/promise';
import dotenv from 'dotenv';
dotenv.config();
const pool = mysql.createPool({
host: process.env.DB_HOST,
user: process.env.DB_USER,
password: process.env.DB_PASSWORD,
database: process.env.DB_NAME,
waitForConnections: true,
connectionLimit: 10,
queueLimit: 0,
ssl: 'amazon-rds',
});
async function getUsers() {
const conn = await pool.getConnection();
const [rows] = await conn.query('SELECT * FROM users');
conn.release();
return rows;
}
getUsers().then(console.log).catch(console.error);Known Issues & Gotchas
Connection pooling limits: PlanetScale free tier has connection limits; Docker containers may exhaust them if not using a connection pool
Fix: Use a connection pooling library (e.g., `mysql2/promise` with connection pools in Node.js) or add PlanetScale's connection pooler to your connection string
SSL/TLS certificate validation: PlanetScale requires SSL connections, which Docker containers may not handle correctly if certificates aren't properly configured
Fix: Add `ssl: 'amazon-rds'` to your connection config or use the `--ssl-mode=REQUIRED` flag; most modern drivers handle this automatically
Secrets management: hardcoding PlanetScale passwords in Dockerfile or docker-compose.yml exposes credentials
Fix: Use Docker secrets (Swarm), environment variable files, or external secret management tools like HashiCorp Vault or AWS Secrets Manager
Network access: Docker containers may be unable to reach PlanetScale if running behind a restrictive firewall or VPN
Fix: Verify firewall rules allow outbound connections on port 3306; whitelist PlanetScale's IP ranges if required by your network policy
Alternatives
- •Docker + RDS (AWS managed MySQL): Similar setup but requires AWS account; offers more customization
- •Docker + Supabase (PostgreSQL alternative): Uses PostgreSQL instead of MySQL; better for serverless workloads
- •Docker + local MySQL container (docker-compose): Eliminates remote database latency for local dev; requires manual schema management
Resources
Related Compatibility Guides
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