docker-automatic-nginx-letsencrypt/docker-compose.override.exa...

---
version: '2'

services:

  letsencrypt-lexicon:
    environment:
      # For testing purposes, use the Let's Encrypt staging server.
      # Remove this for production use!
      - STAGING=yes
      # The e-mail address to provide to Let's Encrypt.
      - EMAIL=your@email.addr
      # The Lexicon provider to use
      - PROVIDER=cloudflare
      # Provider-specific authentication details
      - LEXICON_CLOUDFLARE_USERNAME=your@email.addr
      - LEXICON_CLOUDFLARE_TOKEN=1234567890123456789012345678901234567890