prole/infrastructure/roles/k3s/tasks/main.yml

---

- name: Skip k3s when state is absent
  ansible.builtin.meta: end_host
  when: k3s_state == "absent"

- name: Set k3s service name
  ansible.builtin.set_fact:
    k3s_service_name: "{{ 'k3s' if k3s_role == 'server' else 'k3s-agent' }}"

- name: Check if k3s service is installed
  ansible.builtin.stat:
    path: "/etc/systemd/system/{{ k3s_service_name }}.service"
  register: k3s_service

- name: Check if k3s binary exists
  ansible.builtin.stat:
    path: /usr/local/bin/k3s
  register: k3s_bin

- name: Determine if k3s needs installation
  ansible.builtin.set_fact:
    k3s_needs_install: "{{ not k3s_bin.stat.exists or not k3s_service.stat.exists }}"

- name: Install k3s dependencies
  ansible.builtin.package:
    name:
      - curl
      - iptables
    state: present

- name: Preflight - ensure rancher mountpoint is mounted
  ansible.builtin.command: "findmnt -n {{ k3s_rancher_mountpoint | default('/var/lib/rancher') }}"
  register: rancher_mounted
  changed_when: false
  failed_when: rancher_mounted.rc != 0

- name: Preflight - ensure cgroup kernel params are present
  ansible.builtin.command: "cat /proc/cmdline"
  register: k3s_proc_cmdline
  changed_when: false

- name: Fail if cgroup params are missing (reboot required)
  ansible.builtin.fail:
    msg: "Missing cgroup params in /proc/cmdline: {{ ['cgroup_memory=1', 'cgroup_enable=memory'] | reject('in', k3s_proc_cmdline.stdout) | list }}. Reboot required before k3s install."
  when: (['cgroup_memory=1', 'cgroup_enable=memory'] | reject('in', k3s_proc_cmdline.stdout) | list) | length > 0

- name: Guardrail - ensure rancher mountpoint is not on SD/rootfs
  ansible.builtin.command: "findmnt -n -o SOURCE {{ k3s_rancher_mountpoint | default('/var/lib/rancher') }}"
  register: rancher_source
  changed_when: false

- name: Fail if rancher mountpoint is on SD
  ansible.builtin.fail:
    msg: "{{ k3s_rancher_mountpoint | default('/var/lib/rancher') }} is on SD/rootfs ({{ rancher_source.stdout }}). Refusing to proceed."
  when: rancher_source.stdout is search("mmcblk0") or rancher_source.stdout is search("/dev/mmc")

- name: Preflight - ensure required mountpoints are mounted
  ansible.builtin.command: "findmnt -n {{ item }}"
  register: k3s_required_mounts_present
  changed_when: false
  failed_when: k3s_required_mounts_present.rc != 0
  loop: "{{ k3s_required_mounts | default([]) }}"
  when: (k3s_required_mounts | default([])) | length > 0

- name: Guardrail - ensure required mountpoints are not on SD
  ansible.builtin.command: "findmnt -n -o SOURCE {{ item }}"
  register: k3s_required_mounts_sources
  changed_when: false
  loop: "{{ k3s_required_mounts | default([]) }}"
  when: (k3s_required_mounts | default([])) | length > 0

- name: Fail if required mountpoint is on SD
  ansible.builtin.fail:
    msg: "{{ item.item }} is on SD/rootfs ({{ item.stdout }}). Refusing to proceed."
  loop: "{{ k3s_required_mounts_sources.results }}"
  when: item.stdout is search("mmcblk0") or item.stdout is search("/dev/mmc")

- name: Validate join configuration
  ansible.builtin.assert:
    that:
      - k3s_server_url is defined
      - k3s_server_url | length > 0
      - k3s_token is defined
      - k3s_token | length > 0
    fail_msg: "k3s_server_url and k3s_token are required for non-init nodes."
  when: not k3s_cluster_init | bool

- name: Check for existing k3s server node token
  ansible.builtin.stat:
    path: /var/lib/rancher/k3s/server/node-token
  register: k3s_server_node_token
  when:
    - k3s_guard_token_drift | bool
    - k3s_role == "server"
    - k3s_cluster_init | bool

- name: Read existing k3s server node token
  ansible.builtin.slurp:
    src: /var/lib/rancher/k3s/server/node-token
  register: k3s_server_node_token_raw
  when:
    - k3s_guard_token_drift | bool
    - k3s_role == "server"
    - k3s_cluster_init | bool
    - k3s_server_node_token.stat.exists

- name: Fail when vault k3s token is missing for existing cluster
  ansible.builtin.fail:
    msg: >-
      vault_k3s_token is empty but /var/lib/rancher/k3s/server/node-token exists.
      Refusing to overwrite k3s config. Update vault_k3s.yml or run the k3s sync playbook.      
  when:
    - k3s_guard_token_drift | bool
    - k3s_role == "server"
    - k3s_cluster_init | bool
    - k3s_server_node_token.stat.exists
    - (k3s_token | default('') | trim) | length == 0

- name: Fail on k3s token drift from live cluster
  ansible.builtin.fail:
    msg: >-
      vault_k3s_token does not match the live k3s server node-token.
      Refusing to overwrite k3s config. Run infrastructure/playbooks/k3s_sync.yml
      or update vault_k3s.yml to match the live token.      
  when:
    - k3s_guard_token_drift | bool
    - k3s_role == "server"
    - k3s_cluster_init | bool
    - k3s_server_node_token.stat.exists
    - (k3s_token | default('') | trim) | length > 0
    - (k3s_server_node_token_raw.content | b64decode | trim) != (k3s_token | default('') | trim)

- name: Ensure k3s config directory exists
  ansible.builtin.file:
    path: /etc/rancher/k3s
    state: directory
    mode: "0755"

- name: Load registry defaults from prole.cfg
  ansible.builtin.set_fact:
    k3s_prole_k3s_server_cfg: "{{ lookup('ansible.builtin.ini', 'PROLE_K3S_SERVER section=Global file=' + playbook_dir + '/../../conf/prole.cfg', default='') }}"
    k3s_prole_service_namespace_cfg: "{{ lookup('ansible.builtin.ini', 'SERVICE_NAMESPACE section=Global file=' + playbook_dir + '/../../conf/prole.cfg', default='') }}"
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Resolve k3s registry host
  ansible.builtin.set_fact:
    k3s_registry_host_resolved: >-
      {{ (k3s_registry_host | default('')) if (k3s_registry_host | default('') | length > 0)
         else (k3s_prole_k3s_server_cfg | default('')) if (k3s_prole_k3s_server_cfg | default('') | length > 0)
         else (k3s_server_url | default('')) if (k3s_server_url | default('') | length > 0)
         else inventory_hostname }}      
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Normalize k3s registry host
  ansible.builtin.set_fact:
    k3s_registry_host_resolved: "{{ k3s_registry_host_resolved | regex_replace('^https?://', '') | regex_replace('/.*$', '') | regex_replace(':.*$', '') }}"
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Resolve k3s registry namespace
  ansible.builtin.set_fact:
    k3s_registry_namespace_resolved: >-
      {{ (k3s_registry_namespace | default('')) if (k3s_registry_namespace | default('') | length > 0)
         else (k3s_prole_service_namespace_cfg | default('')) if (k3s_prole_service_namespace_cfg | default('') | length > 0)
         else 'default' }}      
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Validate k3s registry host
  ansible.builtin.assert:
    that:
      - k3s_registry_host_resolved | length > 0
    fail_msg: "k3s registry host could not be resolved (set k3s_registry_host or PROLE_K3S_SERVER)."
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Render k3s registries config
  ansible.builtin.template:
    src: registries.yaml.j2
    dest: "{{ k3s_registry_config_path }}"
    mode: "0644"
  notify: Restart k3s
  when: k3s_state == "present" and k3s_registry_config_enabled | bool

- name: Ensure kubeconfig group exists
  ansible.builtin.group:
    name: "{{ k3s_kubeconfig_group }}"
    state: present

- name: Ensure kubeconfig users are in group (server)
  ansible.builtin.user:
    name: "{{ item }}"
    groups: "{{ k3s_kubeconfig_group }}"
    append: true
  loop: "{{ k3s_kubeconfig_users }}"
  when: k3s_role == "server" and (k3s_kubeconfig_users | length) > 0

- name: Ensure rancher directories are group-accessible
  ansible.builtin.file:
    path: "{{ item }}"
    state: directory
    owner: root
    group: "{{ k3s_kubeconfig_group }}"
    mode: "0750"
  loop:
    - /etc/rancher
    - /etc/rancher/k3s
    - "{{ k3s_rancher_mountpoint | default('/var/lib/rancher') }}"
  when: k3s_state != "absent"

- name: Render k3s config
  ansible.builtin.template:
    src: config.yaml.j2
    dest: /etc/rancher/k3s/config.yaml
    mode: "0640"
  notify: Restart k3s

- name: Build k3s install environment
  ansible.builtin.set_fact:
    k3s_install_env: >-
      {{ {'INSTALL_K3S_EXEC': k3s_role}
         | combine((k3s_version | length > 0) | ternary({'INSTALL_K3S_VERSION': k3s_version}, {})) }}      

- name: Install k3s
  ansible.builtin.shell: |
    curl -sfL https://get.k3s.io | sh -    
  environment:
    "{{ k3s_install_env }}"
  args:
    creates: /usr/local/bin/k3s
  when: k3s_needs_install

- name: Ensure k3s service state
  ansible.builtin.service:
    name: "{{ k3s_service_name }}"
    state: "{{ 'started' if k3s_state == 'present' else 'stopped' }}"
    enabled: "{{ k3s_state == 'present' }}"
  when: k3s_service.stat.exists or k3s_bin.stat.exists

- name: Ensure prole config directory exists
  ansible.builtin.file:
    path: "{{ prole_conf }}"
    state: directory
    mode: "0755"
  when: k3s_state == "present"

- name: Sync prole.cfg to k3s hosts
  ansible.builtin.copy:
    src: "{{ playbook_dir }}/../../conf/prole.cfg"
    dest: "{{ prole_conf }}/prole.cfg"
    mode: "0644"
  when: k3s_state == "present"

- name: Ensure prole home directory exists
  ansible.builtin.file:
    path: "{{ prole_home }}"
    state: directory
    mode: "0755"
  when: k3s_state == "present"

- name: Ensure prole service directory exists
  ansible.builtin.file:
    path: "{{ prole_home }}/etc"
    state: directory
    mode: "0755"
  when: k3s_state == "present"

- name: Sync init_port_forwards.sh to k3s hosts
  ansible.builtin.copy:
    src: "{{ playbook_dir }}/../../etc/init_port_forwards.sh"
    dest: "{{ prole_home }}/etc/init_port_forwards.sh"
    mode: "0755"
  when: k3s_state == "present"

- name: Sync prole_cfg.sh to k3s hosts
  ansible.builtin.copy:
    src: "{{ playbook_dir }}/../../etc/prole_cfg.sh"
    dest: "{{ prole_home }}/etc/prole_cfg.sh"
    mode: "0755"
  when: k3s_state == "present"

- name: Select k3s init server for port-forward token
  ansible.builtin.set_fact:
    prole_port_forward_source_host: "{{ item }}"
  loop: "{{ groups['k3s_hosts'] }}"
  when: hostvars[item].k3s_cluster_init | default(false) | bool
  delegate_to: localhost
  delegate_facts: true
  run_once: true

- name: Require k3s init server for port-forward token
  ansible.builtin.assert:
    that:
      - hostvars['localhost'].prole_port_forward_source_host | default('') | length > 0
    fail_msg: "No k3s init server found for port-forward token."
  delegate_to: localhost
  run_once: true

- name: Ensure prole-installer service account exists
  ansible.builtin.shell: |
    k3s kubectl -n kube-system apply -f - <<'EOF'
    apiVersion: v1
    kind: ServiceAccount
    metadata:
      name: prole-installer
      namespace: kube-system
    ---
    apiVersion: rbac.authorization.k8s.io/v1
    kind: ClusterRoleBinding
    metadata:
      name: prole-installer-admin
    subjects:
    - kind: ServiceAccount
      name: prole-installer
      namespace: kube-system
    roleRef:
      kind: ClusterRole
      name: cluster-admin
      apiGroup: rbac.authorization.k8s.io
    EOF    
  delegate_to: "{{ hostvars['localhost'].prole_port_forward_source_host }}"
  run_once: true
  when: k3s_state == "present"

- name: Ensure prole-installer token secret exists
  ansible.builtin.shell: |
    k3s kubectl -n kube-system apply -f - <<'EOF'
    apiVersion: v1
    kind: Secret
    metadata:
      name: prole-installer-token
      annotations:
        kubernetes.io/service-account.name: prole-installer
    type: kubernetes.io/service-account-token
    EOF    
  delegate_to: "{{ hostvars['localhost'].prole_port_forward_source_host }}"
  run_once: true
  when: k3s_state == "present"

- name: Read prole-installer token for port forwards
  ansible.builtin.shell: >
    k3s kubectl -n kube-system get secret prole-installer-token
    -o jsonpath='{.data.token}' | base64 -d    
  delegate_to: "{{ hostvars['localhost'].prole_port_forward_source_host }}"
  run_once: true
  register: prole_installer_token
  changed_when: false
  when: k3s_state == "present"

- name: Store prole-installer token on controller
  ansible.builtin.set_fact:
    prole_port_forward_token: "{{ prole_installer_token.stdout | default('') }}"
  delegate_to: localhost
  delegate_facts: true
  run_once: true
  when: k3s_state == "present"

- name: Set prole port-forward token for host
  ansible.builtin.set_fact:
    prole_port_forward_token: "{{ hostvars['localhost'].prole_port_forward_token }}"
  when:
    - k3s_state == "present"
    - hostvars['localhost'].prole_port_forward_token | default('') | length > 0

- name: Render kubeconfig for port forwards
  ansible.builtin.template:
    src: prole-kubeconfig.yaml.j2
    dest: "{{ prole_port_forward_kubeconfig }}"
    mode: "0640"
    owner: root
    group: "{{ k3s_kubeconfig_group }}"
  when: k3s_state == "present"

- name: Stop and disable prole port-forwards service
  ansible.builtin.systemd:
    name: "{{ prole_port_forward_service_name }}"
    enabled: false
    state: stopped
    daemon_reload: true
  when: k3s_state == "present"
  failed_when: false

- name: Remove prole port-forwards systemd unit
  ansible.builtin.file:
    path: "/etc/systemd/system/{{ prole_port_forward_service_name }}.service"
    state: absent
  when: k3s_state == "present"