Improve Docker baseline role

README.md

@@ -1,2 +1,59 @@
 # wulf-ansible
 
+Ansible playbooks used by Semaphore for Wulf infrastructure automation.
+
+## Collection requirements
+
+Install required Ansible collections before running playbooks locally or in a new Semaphore worker environment:
+
+```bash
+ansible-galaxy collection install -r collections/requirements.yml
+```
+
+Currently required collections:
+
+- `community.docker`
+- `community.general`
+- `ansible.posix`
+
+## Docker baseline
+
+Semaphore template: **Docker Baseline**
+
+Playbook:
+
+```bash
+ansible-playbook playbooks/docker.yml
+```
+
+The Docker role:
+
+- supports Debian/Ubuntu apt-based hosts,
+- removes conflicting distro/container packages,
+- configures Docker's official apt repository,
+- installs Docker Engine, Buildx, and Compose V2 plugin,
+- configures Docker daemon log rotation and live-restore,
+- enables Docker,
+- adds the target Ansible user to the `docker` group,
+- creates `/opt/stacks`,
+- enables IPv4 forwarding,
+- optionally disables IPv6,
+- creates shared Docker networks such as `pangolin`,
+- verifies `docker --version` and `docker compose version`.
+
+### Docker role variables
+
+```yaml
+docker_package_state: present       # set to latest when intentionally upgrading Docker packages
+docker_stacks_dir: /opt/stacks
+docker_networks:
+  - pangolin
+docker_disable_ipv6: false
+docker_run_hello_world: false       # optional runtime pull/run verification
+```
+
+To run a full runtime verification during provisioning:
+
+```yaml
+docker_run_hello_world: true
+```

collections/requirements.yml

@@ -0,0 +1,5 @@
+---
+collections:
+  - name: community.docker
+  - name: community.general
+  - name: ansible.posix

playbooks/docker.yml

@@ -5,9 +5,3 @@
 
   roles:
     - docker
-
-  tasks:
-    - name: Create shared network (Pangolin/Newt)
-      community.docker.docker_network:
-        name: pangolin
-        state: present

roles/docker/defaults/main.yml

@@ -1,4 +1,19 @@
 ---
+docker_conflicting_packages:
+  - docker.io
+  - docker-doc
+  - docker-compose
+  - docker-compose-v2
+  - podman-docker
+  - containerd
+  - runc
+
+docker_prereq_packages:
+  - ca-certificates
+  - curl
+  - gnupg
+  - python3-docker
+
 docker_packages:
   - docker-ce
   - docker-ce-cli
@@ -6,6 +21,8 @@ docker_packages:
   - docker-buildx-plugin
   - docker-compose-plugin
 
+docker_package_state: present
+
 docker_daemon_config:
   log-driver: json-file
   log-opts:
@@ -16,3 +33,10 @@ docker_daemon_config:
   live-restore: true
 
 docker_disable_ipv6: false
+
+docker_stacks_dir: /opt/stacks
+
+docker_networks:
+  - pangolin
+
+docker_run_hello_world: false

roles/docker/tasks/main.yml

@@ -1,59 +1,57 @@
 ---
-# Remove conflicting packages
+- name: Validate supported OS family
+  assert:
+    that:
+      - ansible_os_family == "Debian"
+      - ansible_distribution | lower in ["debian", "ubuntu"]
+    fail_msg: >-
+      Docker baseline currently supports Debian/Ubuntu apt-based hosts only.
+      Detected {{ ansible_distribution }} / {{ ansible_os_family }}.
+
 - name: Remove conflicting Docker packages
   apt:
-    name:
-      - docker.io
-      - docker-doc
-      - docker-compose
-      - docker-compose-v2
-      - podman-docker
-      - containerd
-      - runc
+    name: "{{ docker_conflicting_packages }}"
     state: absent
 
-# Prerequisites
 - name: Install Docker prerequisites
   apt:
-    name:
-      - ca-certificates
-      - curl
-      - gnupg
+    name: "{{ docker_prereq_packages }}"
     state: present
     update_cache: true
 
-# Keyrings directory
 - name: Create Docker APT keyrings directory
   file:
     path: /etc/apt/keyrings
     state: directory
     mode: "0755"
 
-# Docker GPG key
-- name: Add Docker GPG key
-  shell: |
-    curl -fsSL https://download.docker.com/linux/{{ ansible_distribution | lower }}/gpg | gpg --dearmor -o /etc/apt/keyrings/docker.gpg
-  args:
-    creates: /etc/apt/keyrings/docker.gpg
+- name: Determine dpkg architecture
+  command: dpkg --print-architecture
+  register: docker_dpkg_arch
+  changed_when: false
+
+- name: Download Docker GPG key
+  get_url:
+    url: "https://download.docker.com/linux/{{ ansible_distribution | lower }}/gpg"
+    dest: /etc/apt/keyrings/docker.asc
+    mode: "0644"
+    force: true
 
-# Docker repository
 - name: Add Docker APT repository
   apt_repository:
     repo: >
-      deb [arch=amd64 signed-by=/etc/apt/keyrings/docker.gpg]
+      deb [arch={{ docker_dpkg_arch.stdout }} signed-by=/etc/apt/keyrings/docker.asc]
       https://download.docker.com/linux/{{ ansible_distribution | lower }}
       {{ ansible_distribution_release }} stable
     filename: docker
     state: present
     update_cache: true
 
-# Install Docker
 - name: Install Docker Engine and plugins
   apt:
     name: "{{ docker_packages }}"
-    state: present
+    state: "{{ docker_package_state }}"
 
-# Docker daemon configuration
 - name: Configure Docker daemon
   copy:
     dest: /etc/docker/daemon.json
@@ -63,31 +61,35 @@
     mode: "0644"
   notify: Restart Docker
 
-# Enable Docker
 - name: Enable and start Docker
   systemd:
     name: docker
     enabled: true
     state: started
 
-# Non-root Docker usage
 - name: Add user to docker group
   user:
     name: "{{ docker_manage_user | default(ansible_user) }}"
     groups: docker
     append: true
 
-# Kernel forwarding
+- name: Ensure standard Docker stack directory exists
+  file:
+    path: "{{ docker_stacks_dir }}"
+    state: directory
+    owner: root
+    group: docker
+    mode: "0775"
+
 - name: Enable IP forwarding
-  sysctl:
+  ansible.posix.sysctl:
     name: net.ipv4.ip_forward
     value: "1"
     state: present
     reload: true
 
-# Optional IPv6 disable
 - name: Disable IPv6
-  sysctl:
+  ansible.posix.sysctl:
     name: "{{ item }}"
     value: "1"
     state: present
@@ -95,4 +97,35 @@
   loop:
     - net.ipv6.conf.all.disable_ipv6
     - net.ipv6.conf.default.disable_ipv6
-  when: docker_disable_ipv6
+  when: docker_disable_ipv6
+
+- name: Create shared Docker networks
+  community.docker.docker_network:
+    name: "{{ item }}"
+    state: present
+  loop: "{{ docker_networks }}"
+  when: docker_networks | length > 0
+
+- name: Check Docker version
+  command: docker --version
+  register: docker_version
+  changed_when: false
+
+- name: Check Docker Compose version
+  command: docker compose version
+  register: docker_compose_version
+  changed_when: false
+
+- name: Verify Docker can run containers
+  command: docker run --rm hello-world
+  register: docker_hello_world
+  changed_when: false
+  when: docker_run_hello_world
+
+- name: Show Docker baseline summary
+  debug:
+    msg:
+      docker_version: "{{ docker_version.stdout }}"
+      docker_compose_version: "{{ docker_compose_version.stdout }}"
+      stacks_dir: "{{ docker_stacks_dir }}"
+      networks: "{{ docker_networks }}"