These are the official Docker images for Joomla Component Builder (JCB).

Each image provides a ready-to-use Joomla environment with Joomla Component Builder automatically installed and optionally configurable via environment variables and CLI commands.

No manual installation. No guessing. Just run the container.

https://hub.docker.com/r/octoleo/joomengine

• ✅ Joomla (official base image)
• ✅ Joomla Component Builder (JCB) preloaded in the image
• ✅ Automatic Joomla + JCB installation on first run
• ✅ Safe one-time install (idempotent)
• ✅ Deterministic, fail-fast container startup (set -euo pipefail)
• ✅ Optional extension installation via URL or path
• ✅ Optional Joomla CLI automation
• ✅ SMTP configuration support
• ✅ Runs as www-data (no root runtime)

These images are ideal for:

• Local JCB development
• CI/CD pipelines
• Automated component compilation
• Reproducible Joomla build environments

All images are published under:

octoleo/joomengine

Examples:

docker pull octoleo/joomengine:latest
docker pull octoleo/joomengine:6.1.3
docker pull octoleo/joomengine:6.1.3-php8.2-apache

latest always points to the highest stable JCB release, Apache variant, using the highest supported PHP version.

When the container starts:

1. The custom Joomla entrypoint runs with strict error handling
2. If Joomla is not installed and all required variables are present:
   • Joomla is automatically installed
   • Database is created/verified
   • Admin account is configured
3. Once Joomla is configured (configuration.php exists):
   • Optional extensions are installed from URLs or paths
   • Joomla Component Builder is installed automatically
   • SMTP configuration is applied (if provided)
   • Optional Joomla CLI commands are executed
4. The container continues running as www-data

This guarantees:

• ✓ Fails fast on misconfiguration
• ✓ No silent fallbacks
• ✓ No race conditions
• ✓ No repeated installs
• ✓ No root-owned Joomla files
• ✓ Safe for repeated container restarts

This image is configured entirely via environment variables. All variables are optional unless stated otherwise.

The entrypoint runs in strict mode (set -euo pipefail). Missing or invalid critical values will cause the container to exit early and loudly.

Database Connection - at least one of:

• JOOMLA_DB_HOST - Database hostname (optionally host:port)
• MYSQL_PORT_3306_TCP - Legacy Docker link support

Database Password - at least one of:

• JOOMLA_DB_PASSWORD - Direct password
• JOOMLA_DB_PASSWORD_FILE - Path to password file (e.g., Docker secrets)
• MYSQL_ENV_MYSQL_ROOT_PASSWORD - Used when JOOMLA_DB_USER=root
• JOOMLA_DB_PASSWORD_ALLOW_EMPTY=yes - Explicitly allow empty password

Automatic Joomla installation is performed only if all of the following are true:

• Joomla is not yet installed
• The installation/ directory exists
• All admin variables are present and valid
• Validation passes:
  • JOOMLA_SITE_NAME > 2 characters
  • JOOMLA_ADMIN_USER > 2 characters
  • JOOMLA_ADMIN_USERNAME alphabetical only
  • JOOMLA_ADMIN_PASSWORD > 12 characters
  • JOOMLA_ADMIN_EMAIL valid email format

If any condition fails, the container starts normally without auto-install.

Multiple values must be semicolon-separated (;):

• JOOMLA_EXTENSIONS_URLS - URLs to install after Joomla setup
• JOOMLA_EXTENSIONS_PATHS - Local paths to install after Joomla setup

⚠️ URL validation is intentionally strict (HTTPS/HTTP only, no IPs, no ports in domain).

• JOOMLA_CLI_COMMANDS - Semicolon-separated Joomla CLI commands

Each command is passed as-is to cli/joomla.php. Shell tokenization is not performed.

environment:
  JOOMLA_CLI_COMMANDS: "cache:clean;extension:list --type=component"

What happens:

• Commands run as www-data
• Executed only after Joomla and JCB are ready
• Failures stop the container (safe by default)

• JOOMLA_SMTP_HOST - Format: hostname or hostname:port

⚠️ IPv4 only - IPv6 addresses (e.g., [::1]:587) are not supported.

✓ Fails fast on misconfiguration ✓ No silent fallbacks ✓ Deterministic startup behavior ✓ Safe for repeated container restarts ✓ Compatible with Apache and PHP-FPM variants

services:
  joomla:
    image: octoleo/joomengine:latest
    ports:
      - "8080:80"
    environment:
      JOOMLA_DB_HOST: mariadb:3306
      JOOMLA_DB_USER: joomengine
      JOOMLA_DB_NAME: joomengine
      JOOMLA_DB_PASSWORD: secure_password12345
    depends_on:
      - mariadb
    volumes:
      - joomla_data:/var/www/html

  mariadb:
    image: mariadb:latest
    environment:
      MARIADB_USER: joomengine
      MARIADB_DATABASE: joomengine
      MARIADB_PASSWORD: secure_password12345
      MARIADB_ROOT_PASSWORD: your_root_secure_password12345
    volumes:
      - mariadb_data:/var/lib/mysql

volumes:
  joomla_data:
  mariadb_data:

services:
  joomla:
    image: octoleo/joomengine:latest
    ports:
      - "8080:80"
    environment:
      JOOMLA_DB_HOST: mariadb:3306
      JOOMLA_DB_USER: joomengine
      JOOMLA_DB_NAME: joomengine
      JOOMLA_DB_PASSWORD: secure_password12345
      JOOMLA_CLI_COMMANDS: "componentbuilder:pull:joomla_component --items=d7e30702-ec49-45ac-8897-0389d61d6da0"
    depends_on:
      - mariadb
    volumes:
      - joomla_data:/var/www/html

  mariadb:
    image: mariadb:latest
    environment:
      MARIADB_USER: joomengine
      MARIADB_DATABASE: joomengine
      MARIADB_PASSWORD: secure_password12345
      MARIADB_ROOT_PASSWORD: your_root_secure_password12345
    volumes:
      - mariadb_data:/var/lib/mysql

volumes:
  joomla_data:
  mariadb_data:

Open your browser at:

http://localhost:8080

Admin credentials:

• Username: joomengine
• Password: joomengine@secure

• Joomla and JCB always run as www-data
• Root is used only during bootstrap if required
• File ownership is corrected automatically
• Safe for persistent volumes
• Strict mode prevents silent misconfigurations

Copyright (C) 2021–2026 Llewellyn van der Merwe

Licensed under the GNU General Public License v2 (GPLv2)

See LICENSE for details.