How to Set Up PostgreSQL with Docker on Ubuntu

Short summary

A practical guide to running PostgreSQL 18 on Ubuntu using Docker and Docker Compose, covering Docker Engine installation, environment-based secret management, named volumes, localhost-only port binding, and healthchecks. Key decisions like pinning image tags and avoiding bind mounts are explained with rationale. The tutorial includes full configuration files and shell commands for a reproducible setup.

• •Install Docker Engine and Compose v2 via official apt repository on Ubuntu 22.04/24.04
• •Use named volumes, pinned image tags, .env secrets, and localhost-only port binding for security
• •Add healthchecks so dependent services wait for true database readiness, not just container start

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