ouranos/ansible/kernos/deploy.yml

---
- name: Deploy Kernos MCP Shell Server
  hosts: ubuntu
  vars:
    ansible_common_remote_group: "{{kernos_group | default([]) }}"
    allow_world_readable_tmpfiles: true

  tasks:
  - name: Check if host has kernos service
    ansible.builtin.set_fact:
      has_kernos_service: "{{ 'kernos' in services | default([]) }}"

  - name: Skip hosts without kernos service
    ansible.builtin.meta: end_host
    when: not has_kernos_service

  - name: Create Kernos group
    become: true
    ansible.builtin.group:
      name: "{{kernos_group}}"
      state: present

  - name: Create kernos user
    become: true
    ansible.builtin.user:
      name: "{{kernos_user}}"
      group: "{{kernos_group}}"
      home: "/home/{{kernos_user}}"
      shell: /bin/bash
      system: false
      create_home: true

  - name: Add keeper_user to kernos group
    become: true
    ansible.builtin.user:
      name: "{{keeper_user}}"
      groups: "{{kernos_group}}"
      append: true

  - name: Reset connection to pick up new group membership
    ansible.builtin.meta: reset_connection

  - name: Create required directories
    become: true
    ansible.builtin.file:
      path: "{{kernos_directory}}"
      owner: "{{kernos_user}}"
      group: "{{kernos_group}}"
      state: directory
      mode: '750'

  - name: Ensure tar is installed for unarchive task
    become: true
    ansible.builtin.apt:
      name:
        - tar
      state: present
      update_cache: true

  - name: Ensure Python, Python Dev, Venv module is installed
    become: true
    ansible.builtin.apt:
      name: [python3, python3-venv, python3-dev]
      state: present
      update_cache: true

  - name: Transfer and unarchive git archive
    become: true
    ansible.builtin.unarchive:
      src: "~/rel/kernos_{{kernos_rel}}.tar"
      dest: "{{kernos_directory}}"
      owner: "{{kernos_user}}"
      group: "{{kernos_group}}"
      mode: '550'
    notify: restart kernos

  - name: Ensure venv directory ownership is correct
    become: true
    ansible.builtin.file:
      path: "{{kernos_directory}}/.venv"
      owner: "{{kernos_user}}"
      group: "{{kernos_group}}"
      state: directory
      recurse: true
    when: ansible_facts['file'] is defined or true

  - name: Create virtual environment for Kernos
    become: true
    become_user: "{{kernos_user}}"
    ansible.builtin.command:
      cmd: "python3 -m venv {{kernos_directory}}/.venv/"
      creates: "{{kernos_directory}}/.venv/bin/activate"

  - name: Install wheel in virtual environment
    become: true
    become_user: "{{kernos_user}}"
    ansible.builtin.pip:
      name:
        - wheel
      state: latest
      virtualenv: "{{kernos_directory}}/.venv"

  - name: Install pyproject.toml dependencies in virtualenv
    become: true
    become_user: "{{kernos_user}}"
    ansible.builtin.pip:
      chdir: "{{kernos_directory}}"
      name: .
      virtualenv: "{{kernos_directory}}/.venv"
      virtualenv_command: python3 -m venv
    notify: restart kernos

  - name: Template Kernos .env configuration
    become: true
    ansible.builtin.template:
      src: .env.j2
      dest: "{{kernos_directory}}/.env"
      owner: "{{kernos_user}}"
      group: "{{kernos_group}}"
      mode: '640'
    notify: restart kernos

  - name: Template systemd service file
    become: true
    ansible.builtin.template:
      src: kernos.service.j2
      dest: /etc/systemd/system/kernos.service
      owner: root
      group: root
      mode: '644'
    notify: restart kernos

  - name: Enable and start kernos service
    become: true
    ansible.builtin.systemd:
      name: kernos
      enabled: true
      state: started
      daemon_reload: true

  - name: Flush handlers to restart service before validation
    ansible.builtin.meta: flush_handlers

  - name: Validate Kernos liveness endpoint
    ansible.builtin.uri:
      url: "http://localhost:{{kernos_port}}/live"
      status_code: 200
      return_content: true
    register: live_check
    retries: 5
    delay: 5
    until: live_check.status == 200

  - name: Validate Kernos readiness endpoint
    ansible.builtin.uri:
      url: "http://localhost:{{kernos_port}}/ready"
      status_code: 200
      return_content: true
    register: ready_check
    retries: 5
    delay: 5
    until: ready_check.status == 200

  - name: Validate Kernos health endpoint
    ansible.builtin.uri:
      url: "http://localhost:{{kernos_port}}/health"
      status_code: 200
      return_content: true
    register: health_check
    retries: 5
    delay: 5
    until: health_check.status == 200

  - name: Validate Kernos /metrics endpoint
    ansible.builtin.uri:
      url: "http://localhost:{{kernos_port}}/metrics"
      status_code: 200
      return_content: false
    register: metrics_check
    retries: 5
    delay: 5
    until: metrics_check.status == 200

  handlers:
  - name: restart kernos
    become: true
    ansible.builtin.systemd:
      name: kernos
      state: restarted