add node_exporter role

roles/node_exporter/tasks/Debian.yaml

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+---
+- name: reboot required cron
+  cron:
+    name: "prometheus reboot required"
+    minute: "0"
+    job: |
+      [ ! -f /var/run/reboot-required ] ; printf "node_reboot_required \%s\n" "$?" | {{ node_exporter_bin_path }}/promcat {{ node_exporter_spool_path }}/textfile_collector/node_reboot_required.prom
+    user: root
+    state: absent
+
+- name: copy apt-exporter
+  copy:
+    src: apt-exporter.pl
+    dest: "{{ node_exporter_bin_path }}/apt-exporter"
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: apt metrics cron
+  cron:
+    name: prometheus apt exporter
+    minute: "0"
+    job: |
+      {{ node_exporter_bin_path }}/apt-exporter | {{ node_exporter_bin_path }}/promcat {{ node_exporter_spool_path }}/textfile_collector/apt.prom
+    user: root

roles/node_exporter/tasks/configure.yaml

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+---
+- name: create group
+  group:
+    name: "{{ node_exporter_group }}"
+    system: true
+    state: "{{ node_exporter_group_state | default('present') }}"
+
+- name: create user
+  user:
+    name: "{{ node_exporter_user }}"
+    system: true
+    shell: "{{ node_exporter_user_shell }}"
+    group: "{{ node_exporter_group }}"
+    createhome: false
+    home: "{{ node_exporter_var_path }}"
+    state: "{{ node_exporter_user_state | default('present') }}"
+
+      #- name: create etc path
+      #  file:
+      #    path: "{{ node_exporter_etc_path }}"
+      #    state: directory
+      #    owner: "{{ node_exporter_etc_owner }}"
+      #    group: "{{ node_exporter_etc_group }}"
+      #    mode: "{{ node_exporter_etc_mode }}"
+
+- name: create var path
+  file:
+    path: "{{ node_exporter_var_path }}"
+    state: directory
+    owner: "{{ node_exporter_var_owner }}"
+    group: "{{ node_exporter_var_group }}"
+    mode: "{{ node_exporter_var_mode }}"
+
+- name: create spool path
+  file:
+    path: "{{ item }}"
+    state: directory
+    owner: "{{ node_exporter_spool_owner }}"
+    group: "{{ node_exporter_spool_group }}"
+    mode: "{{ node_exporter_spool_mode }}"
+  loop:
+    - "{{ node_exporter_spool_path }}"
+    - "{{ node_exporter_spool_path }}/textfile_collector"
+
+- name: configure systemd template
+  template:
+    src: node_exporter.service.j2
+    dest: /etc/systemd/system/node_exporter.service
+    owner: root
+    group: root
+    mode: 0444
+  notify: restart node_exporter
+
+- name: manage service
+  service:
+    name: "{{ node_exporter_service_name }}"
+    enabled: "{{ node_exporter_service_enabled }}"
+    state: "{{ node_exporter_service_state }}"
+
+- name: install helper scripts
+  copy:
+    src: "{{ item }}.sh"
+    dest: "{{ node_exporter_bin_path }}/{{ item }}"
+    owner: root
+    group: root
+    mode: '0755'
+  loop:
+    - promcat
+
+- name: node_exporter directory size cron
+  cron:
+    name: node_exporter directory size
+    minute: "*/5"
+    job: >
+      du -sb {{ node_exporter_du_directories | join(' ') }} |
+      sed -ne 's/^\([0-9]\+\)\t\(.*\)$/node_directory_size_bytes{directory="\2"} \1/p' |
+      {{ node_exporter_bin_path }}/promcat {{ node_exporter_spool_path }}/textfile_collector/directory_size.prom
+    user: root
+    state: "{{ (node_exporter_du_directories | length > 0) | ternary('present', 'absent') }}"
+
+- name: configure roles
+  template:
+    src: roles.prom.j2
+    dest: "{{ node_exporter_spool_path }}/textfile_collector/roles.prom"
+    owner: root
+    group: root
+    mode: "0444"

roles/node_exporter/tasks/install.yaml

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+---
+- block:
+  - name: download tar
+    get_url:
+      url: "{{ node_exporter_release_url }}"
+      dest: "{{ node_exporter_download_path }}"
+      checksum: "{{ node_exporter_checksum }}"
+    register: dl
+    until: dl is success
+    retries: 5
+    delay: 10
+
+  - name: extract tar
+    unarchive:
+      src: "{{ node_exporter_download_path }}"
+      dest: "{{ node_exporter_unarchive_dest_path }}"
+      creates: "{{ node_exporter_extracted_path }}/node_exporter"
+      remote_src: true
+
+  - name: install binaries
+    copy:
+      src: "{{ node_exporter_extracted_path }}/{{ item }}"
+      dest: "{{ node_exporter_bin_path }}/{{ item }}"
+      owner: root
+      group: root
+      mode: 0755
+      remote_src: true
+    loop:
+      - node_exporter
+    notify: restart node_exporter
+  when: node_exporter_version != node_exporter_local_version
+

roles/node_exporter/tasks/main.yaml

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+---
+- name: gather os specific variables
+  include_vars: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - vars
+
+- name: include os specific tasks
+  include_tasks: "{{ lookup('first_found', possible_files) }}"
+  vars:
+    possible_files:
+      files:
+        - "{{ ansible_distribution }}-{{ ansible_distribution_version }}.yaml"
+        - "{{ ansible_distribution }}.yaml"
+        - "{{ ansible_os_family }}.yaml"
+        - "default.yaml"
+      paths:
+        - tasks
+
+- include: pre.yaml
+
+- include: install.yaml
+  when:
+    - node_exporter_version is version(node_exporter_local_version, '>')
+
+- include: configure.yaml

roles/node_exporter/tasks/pre.yaml

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+---
+- name: determine if installed
+  stat:
+    path: "{{ node_exporter_bin_path }}/node_exporter"
+  register: st
+
+- name: set node_exporter_installed
+  set_fact:
+    node_exporter_installed: "{{ st.stat.exists | bool }}"
+
+- block:
+  - name: determine latest version
+    uri:
+      url: https://api.github.com/repos/prometheus/node_exporter/releases/latest
+      return_content: true
+      body_format: json
+    register: _latest_version
+    until: _latest_version.status == 200
+    retries: 3
+
+  - name: set node_exporter_version
+    set_fact:
+      node_exporter_version: "{{ _latest_version.json['tag_name'] | regex_replace('^v', '') }}"
+
+- block:
+  - name: determine installed version
+    command: "{{ node_exporter_bin_path }}/node_exporter --version"
+    register: _installed_version_string
+    changed_when: false
+
+  - name: set node_exporter_local_version
+    set_fact:
+      node_exporter_local_version: "{{ _installed_version_string.stdout | regex_search(node_exporter_version_regex, '\\1') | first }}"
+  when: node_exporter_installed
+
+- name: set node_exporter_local_version to 0
+  set_fact:
+    node_exporter_local_version: "0"
+  when: not node_exporter_installed
+
+- block:
+  - name: get checksums
+    set_fact:
+      _checksums: "{{ lookup('url', node_exporter_checksum_url, wantlist=True) }}"
+
+  - name: set node_exporter_checksum
+    set_fact:
+      node_exporter_checksum: "sha256:{{ item.split(' ') | first }}"
+    loop: "{{ _checksums }}"
+    when: "node_exporter_release_file in item"