Set Up PostgreSQL with Docker

Relax. We'll talk through this in plain words — no textbook voice.

What you'll walk away with

Explain the core ideas behind Set Up PostgreSQL with Docker
Run the sample SQL or command and verify its output
Apply the technique to the Tutorial Platform and production scenarios

Build the mental model

A Docker image gives Windows, macOS, and Linux learners a consistent practice environment. A named volume keeps data when the container is replaced, and passwords must not be committed into project source. Production requires more than this local setup: backups, encryption, high availability, and patching all matter.

Connect it to a real scenario

Run the `postgres:18` image and create `tutorial_platform` on first startup. The `pgdata` volume stores database files outside the container lifecycle. Use `pg_isready` to verify that the server is accepting connections.

Pin the image to major version 18
Persist data in a named volume
Check readiness with `pg_isready`

Try the working example

bash

docker volume create pgdata

docker run --name pg-tutorial \
  -e POSTGRES_PASSWORD=learnpg \
  -e POSTGRES_DB=tutorial_platform \
  -p 127.0.0.1:5432:5432 \
  -v pgdata:/var/lib/postgresql/data \
  -d postgres:18

docker exec pg-tutorial pg_isready -U postgres

You should see

PostgreSQL reports `accepting connections` and is ready to use.

5-minute try-it

Stop and start the container, then verify that the named volume preserves your database data.

One important caution

Never reuse the sample password in production. Also protect shell history, avoid committing `.env`, and do not expose the port publicly.

PostgreSQL — Getting Started — PostgreSQL Global Development Group

Easy traps

Never reuse the sample password in production. Also protect shell history, avoid committing `.env`, and do not expose the port publicly.
Validate sample code on a local or test database with recoverable backups before applying it to production data.

Exercise

Stop and start the container, then verify that the named volume preserves your database data.

You'll know it worked when: PostgreSQL reports `accepting connections` and is ready to use.