linode-static-site-infra/ansible/galaxy_roles/caddy-ansible

Caddy Ansible Role

• Dependencies
• Role Variables
  • The Caddyfile
  • The OS to download caddy for
  • Auto update Caddy?
  • Additional Available Packages
  • Use setcap?
  • Use systemd capabilities controls
  • Add additional environment variables
  • Use additional CLI arguments
  • Use a GitHub OAuth token to request the list of caddy releases
• Example Playbooks
• Debugging
• Contributing

This role installs and configures the caddy web server. The user can specify any http configuration parameters they wish to apply their site. Any number of sites can be added with configurations of your choice.

Dependencies

None

Role Variables

The Caddyfile

See Caddyfile docs. Notice the | used to include a multi-line string. You may set caddy_conf_filename to config.json to use json format.

default:

caddy_conf_filename: Caddyfile
caddy_config: |
  http://localhost:2020
  respond "Hello, world!"  

If you wish to use a template for the config you can do this:

caddy_config: "{{ lookup('template', 'templates/Caddyfile.j2') }}"

The OS to download caddy for

default:

caddy_os: linux

Auto update Caddy?

default:

caddy_update: true

Additional Available Packages

Changing this variable will reinstall Caddy with the new packages if caddy_update is enabled. Check https://caddyserver.com/download for available packages.

default:

caddy_packages: []

Use setcap?

This allows Caddy to open a low port (under 1024 - e.g. 80, 443).

default:

caddy_setcap: true

Use systemd capabilities controls

default:

caddy_systemd_capabilities_enabled: false
caddy_systemd_capabilities: "CAP_NET_BIND_SERVICE"

NOTE: This feature requires systemd v229 or newer and might be needed in addition to caddy_setcap: yes.

Supported:

• Debian 9 (stretch)
• Fedora 25
• Ubuntu 16.04 (xenial)

RHEL/CentOS has no release that supports systemd capability controls at this time.

Add additional environment variables

Add environment variables to the systemd script.

default:

caddy_environment_variables: {}

Example usage:

caddy_environment_variables:
  FOO: bar
  SECONDVAR: spam

Use additional CLI arguments

default:

caddy_additional_args: ""

Example for LetsEncrypt staging:

caddy_additional_args: "-ca https://acme-staging.api.letsencrypt.org/directory"

Use a GitHub OAuth token to request the list of caddy releases

This role uses the GitHub releases list to check when a new version is available. GitHub has some fairly agressive rate-limiting which can cause failures. You can set your GitHub token to increase the limits for yourself when running the role (e.g. if deploying many servers behind a NAT or running this role repeatedly as part of a CI process).

default:

caddy_github_token: ""

Example Playbooks

---
- hosts: all
  become: yes
  roles:
    - role: caddy_ansible.caddy_ansible
      caddy_config: |
        files.example.com
        encode gzip
        file_server browse {
            root /home/caddy/
        }        

Example with DigitalOcean DNS for TLS:

---
- hosts: all
  roles:
    - role: caddy_ansible.caddy_ansible
      caddy_environment_variables:
        DO_AUTH_TOKEN: "your-token-here"
      caddy_systemd_capabilities_enabled: true
      caddy_systemd_network_dependency: false
      caddy_packages: ["github.com/caddy-dns/lego-deprecated"]
      caddy_config: |
        nextcloud.example.com {
            log

            reverse_proxy http://localhost:8080 {
                header_up Host {http.request.host}
                header_up X-Real-IP {http.request.remote.host}
                header_up X-Forwarded-For {http.request.remote.host}
                header_up X-Forwarded-Port {http.request.port}
                header_up X-Forwarded-Proto {http.request.scheme}
            }

            tls webmaster@example.com {
                dns lego_deprecated digitalocean
            }
        }        

Debugging

If the service fails to start you can figure out why by looking at the output of Caddy.

systemctl status caddy -l

If something doesn't seem right, open an issue!

Contributing

Pull requests are welcome. Please test your changes beforehand with vagrant:

vagrant up
vagrant provision   # (since it already provisioned there should be no changes here)
vagrant destroy