lily_website

📜 Dockerfile

This Dockerfile defines how the production Nginx Docker image is built. It customizes the base Nginx image by replacing default configurations with project-specific ones, setting up SSL/TLS, and enabling dynamic configuration based on environment variables.

Build Process

Base Image: nginx:alpine (a lightweight Nginx image).
Remove Default Configurations:
- RUN rm /etc/nginx/conf.d/*: Deletes all default Nginx configuration files to ensure a clean slate for custom configurations.
Copy Main Nginx Configuration:
- COPY deploy/nginx/nginx-main.conf /etc/nginx/nginx.conf: Copies the project’s main Nginx configuration file, which includes global settings, upstreams, and other core directives.
Copy Site Configuration Template:
- COPY deploy/nginx/site.conf.template /etc/templates/site.conf.template: Copies a template for the site-specific Nginx configuration. This template will be dynamically rendered at runtime.
Create Certbot Directory:
- RUN mkdir -p /var/www/certbot: Creates a directory used by Certbot for ACME challenges (SSL certificate issuance/renewal).
Exposed Ports:
- EXPOSE 80 443: Informs Docker that the container listens on ports 80 (HTTP) and 443 (HTTPS).
Command:
- CMD ["/bin/sh", "-c", "envsubst '${DOMAIN_NAME}' < /etc/templates/site.conf.template > /etc/nginx/conf.d/site.conf && exec nginx -g 'daemon off;'"]: This command is executed when the container starts.
  - envsubst '${DOMAIN_NAME}' < /etc/templates/site.conf.template > /etc/nginx/conf.d/site.conf: Uses envsubst to replace the ${DOMAIN_NAME} placeholder in site.conf.template with the actual value from the DOMAIN_NAME environment variable. The result is written to /etc/nginx/conf.d/site.conf, creating the final Nginx site configuration.
  - exec nginx -g 'daemon off;': Starts the Nginx server in the foreground, which is a Docker best practice.