Dockerfile for Certbot

This is a Dockerfile for free and automatic Let's Encrypt certificates.

Is based on Alpine Linux.
Uses Certbot.

Once a day it renews certificates automatically if needed.

You can manually trigger certificate renewal:

$ docker-compose exec certbot certbot renew -q

Usage

Use with docker-compose.yml:

services:
  certbot:
    container_name: certbot
    build: github.com/buzz/certbot
    restart: always
    depends_on:
    - nginx
    volumes:
    - ./volumes/www/acme-challenges:/var/www/acme-challenges
    - ./volumes/etc/letsencrypt:/etc/letsencrypt
    environment:
    - DOMAINS
  nginx:
    container_name: nginx
    image: nginx:alpine
    restart: always
    ports:
    - 80:80
    - 443:443
    volumes:
    - ./volumes/www:/var/www
    - ./volumes/etc/nginx:/etc/nginx:ro
    - ./volumes/etc/letsencrypt:/etc/letsencrypt:ro

and an .env file:

DOMAINS="
  example.com
  www.example.com
  foo.example.com
"