feat(reverse_proxy): add Netcup DNS ACME challenge support and refactor Caddy setup

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/reverse_proxy/handlers/main.yml

@@ -1,4 +1,11 @@
 ---
-- name: Restart Caddy
-  ansible.builtin.command: "{{ caddy_binary }} reload --config {{ caddy_config_path  }}"
+- name: Restart caddy service
+  ansible.builtin.systemd:
+    name: caddy
+    state: restarted
+  become: true
+
+- name: Update apt cache
+  ansible.builtin.apt:
+    update_cache: true
   become: true

roles/reverse_proxy/tasks/10_caddy_install.yml

@@ -0,0 +1,23 @@
+---
+- name: Download Caddy GPG Key
+  ansible.builtin.get_url:
+    url: https://dl.cloudsmith.io/public/caddy/stable/gpg.key
+    dest: /usr/share/keyrings/caddy-stable-archive-keyring.asc
+    mode: "0644"
+  become: true
+
+- name: Add Caddy repository source list
+  ansible.builtin.apt_repository:
+    repo: "{{ item }}"
+    state: present
+  become: true
+  notify: Update apt cache
+  loop:
+    - "deb [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.asc] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main"
+    - "deb-src [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.asc] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main"
+
+- name: Install Caddy
+  ansible.builtin.apt:
+    name: caddy
+    state: present
+  become: true

roles/reverse_proxy/tasks/20_xcaddy_install.yml

@@ -24,8 +24,8 @@
     state: present
   become: true
 
-- name: Install Caddy
-  ansible.builtin.command: xcaddy build --with github.com/caddy-dns/netcup
+- name: Build Custom Caddy with netcup
+  ansible.builtin.command: xcaddy build --with github.com/caddy-dns/netcup {{ reverse_proxy_caddy_version}}
   environment:
     PATH: "{{ ansible_env.PATH }}:/usr/local/go/bin"
   register: xcaddy_build

roles/reverse_proxy/tasks/30_custom_caddy.yml

@@ -0,0 +1,41 @@
+---
+- name: Check current diversion status for {{ reverse_proxy_default_caddy_path }}
+  ansible.builtin.command:
+    cmd: dpkg-divert --list {{ reverse_proxy_default_caddy_path }}
+  register: divert_check_result
+  changed_when: false # This task only checks state
+  failed_when: false # Don't fail if diversion doesn't exist (rc=1)
+  become: true
+
+- name: Divert package manager's caddy binary path
+  ansible.builtin.command:
+    cmd: dpkg-divert --divert {{ reverse_proxy_diverted_caddy_path }} --rename {{ reverse_proxy_default_caddy_path }}
+  # Only run if the diversion isn't already set correctly
+  when: "reverse_proxy_diverted_caddy_path not in divert_check_result.stdout"
+  notify: Restart caddy service # Notify restart if diversion happens
+  become: true
+
+- name: Copy custom Caddy binary to destination path
+  ansible.builtin.copy:
+    src: "{{ reverse_proxy_custom_caddy_source_path }}"
+    dest: "{{ reverse_proxy_custom_caddy_dest_path }}"
+    owner: root
+    group: root
+    mode: "0755"
+    remote_src: true
+  notify: Restart caddy service # Notify restart if binary changes
+  become: true
+
+- name: Install original (diverted) caddy binary alternative
+  ansible.builtin.command:
+    # Use --force if the link /usr/bin/caddy might exist but not be managed by alternatives yet
+    cmd: update-alternatives --install {{ reverse_proxy_alternatives_link }} {{ reverse_proxy_alternatives_name }} {{ reverse_proxy_diverted_caddy_path }} 10
+  changed_when: false # update-alternatives is idempotent but often reports no change via rc
+  become: true
+
+- name: Install custom caddy binary alternative with higher priority
+  ansible.builtin.command:
+    cmd: update-alternatives --install {{ reverse_proxy_alternatives_link }} {{ reverse_proxy_alternatives_name }} {{ reverse_proxy_custom_caddy_dest_path }} 50
+  changed_when: false # update-alternatives is idempotent but often reports no change via rc
+  notify: Restart caddy service
+  become: true

roles/reverse_proxy/tasks/50_netcup_dns.yml

@@ -0,0 +1,14 @@
+---
+- name: Setup DNS on Netcup
+  community.general.netcup_dns:
+    api_key: "{{ reverse_proxy_netcup_api_key }}"
+    api_password: "{{ reverse_proxy_netcup_api_password }}"
+    customer_id: "{{ reverse_proxy_netcup_customer_id }}"
+    domain: "{{ domain }}"
+    name: "{{ service.name }}"
+    type: "A"
+    value: "{{ hostvars['docker-lb'].ansible_default_ipv4.address }}"
+  loop: "{{ services }}"
+  loop_control:
+    loop_var: service
+  delegate_to: localhost

roles/reverse_proxy/tasks/80_configure.yml

@@ -13,4 +13,10 @@
     mode: "0644"
     backup: true
   become: true
-  notify: Restart Caddy
+  notify: Restart caddy service
+
+- name: Format Caddy configuration file
+  ansible.builtin.command:
+    cmd: "caddy fmt --overwrite {{ caddy_config_path }}"
+  become: true
+  notify: Restart caddy service

roles/reverse_proxy/tasks/main.yml

@@ -1,9 +1,18 @@
 ---
-- name: Install Prerequisites
-  ansible.builtin.include_tasks: prereq.yml
+- name: Install Go for Caddy
+  ansible.builtin.include_tasks: 00_go_install.yml
+
 - name: Install Caddy
-  ansible.builtin.include_tasks: install.yml
+  ansible.builtin.include_tasks: 10_caddy_install.yml
+
+- name: Install xCaddy
+  ansible.builtin.include_tasks: 20_xcaddy_install.yml
+
+- name: Setup Custom Caddy
+  ansible.builtin.include_tasks: 30_custom_caddy.yml
+
+- name: Setup Netcup DNS
+  ansible.builtin.include_tasks: 50_netcup_dns.yml
+
 - name: Configure Caddy
-  ansible.builtin.include_tasks: configure.yml
-- name: Start Caddy
-  ansible.builtin.include_tasks: start.yml
+  ansible.builtin.include_tasks: 80_configure.yml

roles/reverse_proxy/tasks/start.yml

@@ -1,4 +0,0 @@
----
-- name: Ensure Caddy service is running
-  ansible.builtin.command: "{{ caddy_binary }} start --config {{ caddy_config_path }}"
-  become: true

roles/reverse_proxy/templates/Caddyfile.j2

@@ -9,13 +9,14 @@
 {% set http_port = service.ports | selectattr('name', 'equalto', 'http') | map(attribute='external') | list %}
 {% if http_port %}
 {{ service.name }}.{{ domain }} {
-    {% for vm in service.vm %}
-    reverse_proxy {{ hostvars[vm].ansible_host }}:{{ http_port[0] }}
-    {% endfor %}
-    log {
-        output file /var/log/caddy/{{ service.name }}.log
-        format json
-    }
+  {% for vm in service.vm -%}
+  reverse_proxy {{ hostvars[vm].ansible_default_ipv4.address }}:{{ http_port[0] }}
+  {% endfor %}{{''}}
+  log {
+      output file /var/log/caddy/{{ service.name }}.log
+      format json
+  }
+
 	tls {
 		dns netcup {
 			customer_number {{ vault_netcup.customer_number }}

roles/reverse_proxy/vars/main.yml

@@ -0,0 +1,12 @@
+reverse_proxy_caddy_version: v2.9.1
+
+reverse_proxy_custom_caddy_source_path: "{{ ansible_env.HOME }}/caddy"
+reverse_proxy_default_caddy_path: "/usr/bin/caddy"
+reverse_proxy_custom_caddy_dest_path: "/usr/bin/caddy.custom"
+reverse_proxy_diverted_caddy_path: "/usr/bin/caddy.default"
+reverse_proxy_alternatives_link: "/usr/bin/caddy"
+reverse_proxy_alternatives_name: "caddy"
+
+reverse_proxy_netcup_api_key: "{{ netcup_api_key }}"
+reverse_proxy_netcup_api_password: "{{ netcup_api_password }}"
+reverse_proxy_netcup_customer_id: "{{ netcup_customer_id }}"