caddy_docker

Ansible Role: dbrennand.caddy_docker

Ansible role to deploy Caddy in a Docker container.

Requirements

Docker
Docker SDK for Python

community.docker Ansible collection:

ansible-galaxy collection install community.docker

Role Variables

caddy_docker_state: present

Manage the state of the resources deployed by this role. Set to absent to remove the Caddy directories (data and config), Caddyfile, Docker network(s), image and container.

caddy_docker_config_directory:
  path: ~/.config/caddy/
  # Optional
  # owner: owner
  # group: group
  # mode: 0755
caddy_docker_data_directory:
  path: ~/.local/share/caddy/
  # ...

Absolute path to Caddy config and data directories to be created. Attached to the container as bind mounts.

caddy_docker_caddyfile: |-
  localhost
  respond "Hello, world!"

Contents of the Caddyfile used to configure Caddy.

caddy_docker_caddyfile_file:
  path: ~/.config/Caddyfile
  # ...

Absolute path to the Caddyfile to be created. Attached to the container as a bind mount.

caddy_docker_image: caddy:2.7.4-alpine
caddy_docker_builder_image: caddy:2.7.4-builder

Container image repositories, names and tags used to deploy Caddy as a container. The caddy_docker_builder_image variable is only used when caddy_docker_plugins is populated.

caddy_docker_builder_directory:
  path: /tmp/caddy-builder/
  # ...

Absolute path for the directory used as the container build context. This variable is only used when caddy_docker_plugins is populated. You may want to override this variable if you bring your own dockerfile template and want to include files during the Caddy container's build process.

caddy_docker_builder_template: dockerfile.j2
# Using the lookup plugin
# caddy_docker_builder_template: "{{ lookup('template', 'templates/dockerfile.custom.j2') }}"

Dockerfile template used to build the Caddy container. This variable is only used when caddy_docker_plugins is populated.

caddy_docker_builder_force: false

Whether or not to force a rebuild of the Caddy container. This variable is only used when caddy_docker_plugins is populated.

caddy_docker_plugins: []
# Example
# caddy_docker_plugins:
#   - github.com/caddy-dns/cloudflare
#   - github.com/lucaslorentz/caddy-docker-proxy/v2

List of plugins to include in the Caddy container.

caddy_docker_networks:
  - name: caddy

Names of the Docker networks to be created and attached to the Caddy container.

caddy_docker_network_mode: default

Docker network mode to use for the Caddy container. The caddy_docker_networks, caddy_docker_ports and caddy_docker_exposed_ports variables have no affect when this variable is set to host.

caddy_docker_command: caddy run --config /etc/caddy/Caddyfile --adapter caddyfile

Command for starting the Caddy container. You may want to override this when using plugins.

caddy_docker_restart_policy: unless-stopped

Restart policy for the Caddy container.

caddy_docker_ports:
  - 80:80
  - 443:443
  - "443:443/udp"
caddy_docker_exposed_ports: []
# Example
# caddy_docker_exposed_ports:
#   - 9000

Ports to expose on the Caddy container.

caddy_docker_etc_hosts: {}
# Example
# caddy_docker_etc_hosts:
#   host.docker.internal: host-gateway

Host to IP mappings to place into the Caddy container's /etc/hosts file.

caddy_docker_extra_volumes: []
# Example
# caddy_docker_extra_volumes:
#   - /site:/srv

Extra volumes to attach to the Caddy container.

caddy_docker_environment_variables: {}
# Example
# caddy_docker_environment_variables:
#   DOMAIN: example.com

Environment variables to apply to the Caddy container.

Dependencies

None.

Example Playbook

- name: dbrennand.caddy_docker
  hosts: all
  vars:
    pip_install_packages:
      - name: docker
  pre_tasks:
    - name: Update apt cache
      ansible.builtin.apt:
        update_cache: true
  roles:
    - geerlingguy.pip
    - geerlingguy.docker
    - dbrennand.caddy_docker

Example - Cloudflare DNS-01 Challenge

This example uses the Cloudflare module for Caddy to obtain certificates (including wildcards) from Let's Encrypt for a Cloudflare managed domain. This is useful when you want to obtain certificates without opening port 80 (HTTP) to the internet.

You must generate an API token for Caddy to authenticate to the Cloudflare API and create a TXT record for the DNS-01 challenge:

Go to the Cloudflare dashboard profile page.
On the left select API Tokens > Create Token.
Select the API token template named Edit zone DNS.
Modify the Token name to your liking.
Under Permissions select + Add more and add the permission: Zone / Zone / Read.
Under Zone Resources include your zone: Include / Specific zone / example.tld.
Optional - Configure Client IP Address Filtering if desired.
Click Continue to summary > Create Token.

- name: dbrennand.caddy_docker - Cloudflare
  hosts: all
  vars:
    # geerlingguy.pip role vars
    pip_install_packages:
      - name: docker
    # dbrennand.caddy_docker role vars
    caddy_docker_caddyfile: |-
      {
              email {$ACME_EMAIL}
      }

      # Cloudflare DNS-01 challenge
      (cloudflare) {
              tls {
                      dns cloudflare {$CLOUDFLARE_API_TOKEN}
              }
      }

      service.{$DOMAIN} {
              import cloudflare
              reverse_proxy container:port
      }
    caddy_docker_plugins:
      - github.com/caddy-dns/cloudflare
    caddy_docker_environment_variables:
      DOMAIN: domain.tld
      ACME_EMAIL: [email protected]
      CLOUDFLARE_API_TOKEN: token
  pre_tasks:
    - name: Update apt cache
      ansible.builtin.apt:
        update_cache: true
  roles:
    - geerlingguy.pip
    - geerlingguy.docker
    - dbrennand.caddy_docker

Example - Tailscale

This example uses artis3n/ansible-role-tailscale to install Tailscale and configure Caddy to obtain a certificate from Let's Encrypt for your Tailscale node. You must have MagicDNS and HTTPS Certificate features enabled for your Tailnet.

- name: dbrennand.caddy_docker - Tailscale
  hosts: all
  vars:
    # geerlingguy.pip role vars
    pip_install_packages:
      - name: docker
    # artis3n.tailscale role vars
    tailscale_authkey: key
    # dbrennand.caddy_docker role vars
    caddy_docker_caddyfile: |-
      {
              email {$ACME_EMAIL}
      }

      # Tailscale
      (tailscale) {
              tls {
                      get_certificate tailscale
              }
      }

      node.{$TAILNET} {
              import tailscale
              reverse_proxy container:port
      }
    caddy_docker_extra_volumes:
      - /var/run/tailscale/tailscaled.sock:/var/run/tailscale/tailscaled.sock
    caddy_docker_environment_variables:
      ACME_EMAIL: [email protected]
      TAILNET: domain-alias.ts.net
  pre_tasks:
    - name: Update apt cache
      ansible.builtin.apt:
        update_cache: true
  roles:
    - geerlingguy.pip
    - geerlingguy.docker
    - artis3n.tailscale
    - dbrennand.caddy_docker