What is Wordpress

Wordpress is a web content management system. It was originally created as a tool to publish blogs but has evolved to support publishing other web content, including more traditional websites, mailing lists and Internet forum, media galleries, membership sites, learning management systems and online stores.

Minimalistic setup

Caddyfile

The following Caddyfile will enable Souin as cache system in caddy. We set dynamically the server name using the environment variable.

{
    default_sni {$SERVER_NAME}
    cache {
        api {
            souin
        }
    }
}

{$SERVER_NAME} {
	@authorized-cache {
		not header_regexp Cookie "comment_author|wordpress_[a-f0-9]+|wp-postpass|wordpress_logged_in"
		not path_regexp "(/wp-admin/|/xmlrpc.php|/wp-(app|cron|login|register|mail).php|wp-.*.php|/feed/|index.php|wp-comments-popup.php|wp-links-opml.php|wp-locations.php|sitemap(index)?.xml|[a-z0-9-]+-sitemap([0-9]+)?.xml)"
		not method POST
		not expression {query} != ''
	}
    cache @authorized-cache
    root * /var/www/html
    encode zstd gzip

    php_fastcgi wordpress:9000
    file_server

    log {
        output file /var/log/caddy.log
    }

    header / {
        X-Frame-Options "SAMEORIGIN"
        X-Content-Type-Options "nosniff"
    }

}

Docker setup

You just need to setup a compose.yaml file that will contain the 3 needed services, caddy, wordpress, mysql:

version: '3.8'

services:
  caddy:
    build:
      context: .
    environment:
      SERVER_NAME: localhost
    volumes:
      - wordpress:/var/www/html
      - ./Caddyfile:/etc/caddy/Caddyfile
    ports:
      - 80:80
      - 443:443
      - 443:443/udp

  wordpress:
    image: wordpress:fpm
    restart: always
    environment:
      WORDPRESS_DB_HOST: db
      WORDPRESS_DB_USER: demo
      WORDPRESS_DB_PASSWORD: demo
      WORDPRESS_DB_NAME: demo
    volumes:
      - wordpress:/var/www/html

  db:
    image: mysql:8.0
    restart: always
    environment:
      MYSQL_DATABASE: demo
      MYSQL_USER: demo
      MYSQL_PASSWORD: demo
      MYSQL_RANDOM_ROOT_PASSWORD: '1'
    volumes:
      - db:/var/lib/mysql

volumes:
  wordpress:
  db:

As we defined the caddy service with a custom image, let’s define the Dockerfile to build the caddy instance with Souin HTTP cache:

FROM caddy:builder-alpine AS builder
RUN xcaddy build --with github.com/darkweak/souin/plugins/caddy

FROM caddy
COPY --from=builder /usr/bin/caddy /usr/bin/caddy

And voilà, you’re now ready to run:

docker compose up -d