refactor(node_exporter): delegate common tasks to _common role

Signed-off-by: gardar <gardar@users.noreply.github.com>

roles/node_exporter/defaults/main.yml

@@ -1,10 +1,8 @@
 ---
 node_exporter_version: 1.8.2
-node_exporter_binary_local_dir: ""
 node_exporter_binary_url: "https://github.com/{{ _node_exporter_repo }}/releases/download/v{{ node_exporter_version }}/\
-                           node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+                           node_exporter-{{ node_exporter_version }}.{{ ansible_system | lower }}-{{ _node_exporter_go_ansible_arch }}.tar.gz"
 node_exporter_checksums_url: "https://github.com/{{ _node_exporter_repo }}/releases/download/v{{ node_exporter_version }}/sha256sums.txt"
-node_exporter_skip_install: false
 
 node_exporter_web_disable_exporter_metrics: false
 node_exporter_web_listen_address: "0.0.0.0:9100"
@@ -32,5 +30,6 @@ node_exporter_binary_install_dir: "/usr/local/bin"
 node_exporter_system_group: "node-exp"
 node_exporter_system_user: "{{ node_exporter_system_group }}"
 
+node_exporter_config_dir: "/etc/node_exporter"
 # Local path to stash the archive and its extraction
-node_exporter_archive_path: /tmp
+node_exporter_local_cache_path: "/tmp/node_exporter-{{ ansible_system | lower }}-{{ _node_exporter_go_ansible_arch }}/{{ node_exporter_version }}"

roles/node_exporter/meta/argument_specs.yml

@@ -11,18 +11,9 @@ argument_specs:
       node_exporter_version:
         description: "Node exporter package version. Also accepts latest as parameter."
         default: "1.8.2"
-      node_exporter_skip_install:
-        description: "Node exporter installation tasks gets skipped when set to true."
-        type: bool
-        default: false
-      node_exporter_binary_local_dir:
-        description:
-          - "Enables the use of local packages instead of those distributed on github."
-          - "The parameter may be set to a directory where the C(node_exporter) binary is stored on the host where ansible is run."
-          - "This overrides the I(node_exporter_version) parameter"
       node_exporter_binary_url:
         description: "URL of the node exporter binaries .tar.gz file"
-        default: "https://github.com/{{ _node_exporter_repo }}/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
+        default: "https://github.com/{{ _node_exporter_repo }}/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.{{ ansible_system | lower }}-{{ _node_exporter_go_ansible_arch }}.tar.gz"
       node_exporter_checksums_url:
         description: "URL of the node exporter checksums file"
         default: "https://github.com/{{ _node_exporter_repo }}/releases/download/v{{ node_exporter_version }}/sha256sums.txt"
@@ -85,6 +76,9 @@ argument_specs:
           - "I(Advanced)"
           - "Node exporter user"
         default: "node-exp"
-      node_exporter_archive_path:
-        description: 'Local path to stash the archive and its extraction'
-        default: "/tmp"
+      node_exporter_local_cache_path:
+        description: "Local path to stash the archive and its extraction"
+        default: "/tmp/node_exporter-{{ ansible_system | lower }}-{{ _node_exporter_go_ansible_arch }}/{{ node_exporter_version }}"
+      node_exporter_config_dir:
+        description: "Path to directory with node_exporter configuration"
+        default: "/etc/node_exporter"

roles/node_exporter/molecule/alternative/molecule.yml

@@ -5,7 +5,7 @@ provisioner:
   inventory:
     group_vars:
       all:
-        node_exporter_binary_local_dir: "/tmp/node_exporter-linux-amd64"
+        node_exporter_local_cache_path: "/tmp/node_exporter-linux-amd64"
         node_exporter_web_listen_address:
           - '127.0.0.1:8080'
           - '127.0.1.1:8080'
@@ -21,8 +21,6 @@ provisioner:
           http2: true
         node_exporter_basic_auth_users:
           randomuser: examplepassword
-        go_arch: amd64
         node_exporter_version: 1.5.0
         node_exporter_binary_url: "https://github.com/prometheus/node_exporter/releases/download/v{{\
-                                   \ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-{{\
-                                   \ go_arch }}.tar.gz"
+                                   \ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz"

roles/node_exporter/molecule/default/tests/test_default.py

@@ -46,7 +46,6 @@ def test_user(host):
     assert host.group("node-exp").exists
     assert "node-exp" in host.user("node-exp").groups
     assert host.user("node-exp").shell == "/usr/sbin/nologin"
-    assert host.user("node-exp").home == "/"
 
 
 def test_service(host):

roles/node_exporter/tasks/configure.yml

@@ -1,29 +1,19 @@
 ---
-- name: Copy the node_exporter systemd service file
-  ansible.builtin.template:
-    src: node_exporter.service.j2
-    dest: /etc/systemd/system/node_exporter.service
-    owner: root
-    group: root
-    mode: 0644
-  notify: restart node_exporter
-
-- name: Create node_exporter config directory
-  ansible.builtin.file:
-    path: "/etc/node_exporter"
-    state: directory
-    owner: root
-    group: root
-    mode: u+rwX,g+rwX,o=rX
-
-- name: Copy the node_exporter config file
-  ansible.builtin.template:
-    src: config.yaml.j2
-    dest: /etc/node_exporter/config.yaml
-    owner: root
-    group: root
-    mode: 0644
-  notify: restart node_exporter
+- name: Configure
+  ansible.builtin.include_role:
+    name: prometheus.prometheus._common
+    tasks_from: configure.yml
+  vars:
+    _common_system_user: "{{ node_exporter_system_user }}"
+    _common_system_group: "{{ node_exporter_system_group }}"
+    _common_config_dir: "{{ node_exporter_config_dir }}"
+    _common_tls_server_config: "{{ node_exporter_tls_server_config }}"
+    _common_http_server_config: "{{ node_exporter_http_server_config }}"
+    _common_basic_auth_users: "{{ node_exporter_basic_auth_users }}"
+  tags:
+    - node_exporter
+    - configure
+    - node_exporter_configure
 
 - name: Create textfile collector dir
   ansible.builtin.file:
@@ -32,14 +22,9 @@
     owner: "{{ node_exporter_system_user }}"
     group: "{{ node_exporter_system_group }}"
     mode: u+rwX,g+rwX,o=rX
+  become: true
   when: node_exporter_textfile_dir | length > 0
-
-- name: Allow node_exporter port in SELinux on RedHat OS family
-  community.general.seport:
-    ports: "{{ node_exporter_web_listen_address.split(':')[-1] }}"
-    proto: tcp
-    setype: http_port_t
-    state: present
-  when:
-    - ansible_version.full is version_compare('2.4', '>=')
-    - ansible_selinux.status == "enabled"
+  tags:
+    - node_exporter
+    - configure
+    - node_exporter_configure

roles/node_exporter/tasks/install.yml

@@ -1,69 +0,0 @@
----
-- name: Create the node_exporter group
-  ansible.builtin.group:
-    name: "{{ node_exporter_system_group }}"
-    state: present
-    system: true
-  when: node_exporter_system_group != "root"
-
-- name: Create the node_exporter user
-  ansible.builtin.user:
-    name: "{{ node_exporter_system_user }}"
-    groups: "{{ node_exporter_system_group }}"
-    append: true
-    shell: /usr/sbin/nologin
-    system: true
-    create_home: false
-    home: /
-  when: node_exporter_system_user != "root"
-
-- name: Get binary
-  when:
-    - node_exporter_binary_local_dir | length == 0
-    - not node_exporter_skip_install
-  block:
-
-    - name: Download node_exporter binary to local folder
-      become: false
-      ansible.builtin.get_url:
-        url: "{{ node_exporter_binary_url }}"
-        dest: "{{ node_exporter_archive_path }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
-        checksum: "sha256:{{ __node_exporter_checksum }}"
-        mode: '0644'
-      register: _download_binary
-      until: _download_binary is succeeded
-      retries: 5
-      delay: 2
-      delegate_to: localhost
-      check_mode: false
-
-    - name: Unpack node_exporter binary
-      become: false
-      ansible.builtin.unarchive:
-        src: "{{ node_exporter_archive_path }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}.tar.gz"
-        dest: "{{ node_exporter_archive_path }}"
-        creates: "{{ node_exporter_archive_path }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}/node_exporter"
-      delegate_to: localhost
-      check_mode: false
-
-    - name: Propagate node_exporter binaries
-      ansible.builtin.copy:
-        src: "{{ node_exporter_archive_path }}/node_exporter-{{ node_exporter_version }}.linux-{{ go_arch }}/node_exporter"
-        dest: "{{ node_exporter_binary_install_dir }}/node_exporter"
-        mode: 0755
-        owner: root
-        group: root
-      notify: restart node_exporter
-      when: not ansible_check_mode
-
-- name: Propagate locally distributed node_exporter binary
-  ansible.builtin.copy:
-    src: "{{ node_exporter_binary_local_dir }}/node_exporter"
-    dest: "{{ node_exporter_binary_install_dir }}/node_exporter"
-    mode: 0755
-    owner: root
-    group: root
-  when:
-    - node_exporter_binary_local_dir | length > 0
-    - not node_exporter_skip_install
-  notify: restart node_exporter

roles/node_exporter/tasks/main.yml

@@ -2,40 +2,34 @@
 - name: Preflight
   ansible.builtin.include_tasks:
     file: preflight.yml
-    apply:
-      tags:
-        - node_exporter_install
-        - node_exporter_configure
-        - node_exporter_run
   tags:
     - node_exporter_install
     - node_exporter_configure
     - node_exporter_run
 
 - name: Install
-  ansible.builtin.include_tasks:
-    file: install.yml
-    apply:
-      become: true
-      tags:
-        - node_exporter_install
-  when:
-    ( not __node_exporter_is_installed.stat.exists ) or
-    ( (__node_exporter_current_version_output.stderr_lines | length > 0)
-      and (__node_exporter_current_version_output.stderr_lines[0].split(" ")[2] != node_exporter_version) ) or
-    ( (__node_exporter_current_version_output.stdout_lines | length > 0)
-      and (__node_exporter_current_version_output.stdout_lines[0].split(" ")[2] != node_exporter_version) ) or
-    ( node_exporter_binary_local_dir | length > 0 )
+  ansible.builtin.include_role:
+    name: prometheus.prometheus._common
+    tasks_from: install.yml
+  vars:
+    _common_local_cache_path: "{{ node_exporter_local_cache_path }}"
+    _common_binaries: "{{ _node_exporter_binaries }}"
+    _common_binary_install_dir: "{{ node_exporter_binary_install_dir }}"
+    _common_binary_url: "{{ node_exporter_binary_url }}"
+    _common_checksums_url: "{{ node_exporter_checksums_url }}"
+    _common_system_group: "{{ node_exporter_system_group }}"
+    _common_system_user: "{{ node_exporter_system_user }}"
+    _common_config_dir: "{{ node_exporter_config_dir }}"
+    _common_binary_unarchive_opts: ['--strip-components=1']
   tags:
     - node_exporter_install
 
 - name: SELinux
-  ansible.builtin.include_tasks:
-    file: selinux.yml
-    apply:
-      become: true
-      tags:
-        - node_exporter_configure
+  ansible.builtin.include_role:
+    name: prometheus.prometheus._common
+    tasks_from: selinux.yml
+  vars:
+    _common_selinux_port: "{{ node_exporter_web_listen_address | urlsplit('port') }}"
   when: ansible_selinux.status == "enabled"
   tags:
     - node_exporter_configure
@@ -43,10 +37,6 @@
 - name: Configure
   ansible.builtin.include_tasks:
     file: configure.yml
-    apply:
-      become: true
-      tags:
-        - node_exporter_configure
   tags:
     - node_exporter_configure
 

roles/node_exporter/tasks/preflight.yml

@@ -1,24 +1,8 @@
 ---
-- name: Assert usage of systemd as an init system
-  ansible.builtin.assert:
-    that: ansible_service_mgr == 'systemd'
-    msg: "This role only works with systemd"
-
-- name: Install package fact dependencies
-  become: true
-  ansible.builtin.package:
-    name: "{{ _pkg_fact_req }}"
-    state: present
-  when: (_pkg_fact_req)
-  vars:
-    _pkg_fact_req: "{% if (ansible_pkg_mgr == 'apt') %}\
-      {{ ('python-apt' if ansible_python_version is version('3', '<') else 'python3-apt') }}
-      {% else %}\
-      {% endif %}"
-
-- name: Gather package facts
-  ansible.builtin.package_facts:
-  when: "not 'packages' in ansible_facts"
+- name: Common preflight
+  ansible.builtin.include_role:
+    name: prometheus.prometheus._common
+    tasks_from: preflight.yml
 
 - name: Assert that used version supports listen address type
   ansible.builtin.assert:
@@ -72,23 +56,6 @@
           - "__node_exporter_cert_file.stat.exists"
           - "__node_exporter_key_file.stat.exists"
 
-- name: Check if node_exporter is installed
-  ansible.builtin.stat:
-    path: "{{ node_exporter_binary_install_dir }}/node_exporter"
-  register: __node_exporter_is_installed
-  check_mode: false
-  tags:
-    - node_exporter_install
-
-- name: Gather currently installed node_exporter version (if any)
-  ansible.builtin.command: "{{ node_exporter_binary_install_dir }}/node_exporter --version"
-  changed_when: false
-  register: __node_exporter_current_version_output
-  check_mode: false
-  when: __node_exporter_is_installed.stat.exists
-  tags:
-    - node_exporter_install
-
 - name: Discover latest version
   ansible.builtin.set_fact:
     node_exporter_version: "{{ (lookup('url', 'https://api.github.com/repos/{{ _node_exporter_repo }}/releases/latest', headers=_github_api_headers,
@@ -98,24 +65,9 @@
   retries: 10
   when:
     - node_exporter_version == "latest"
-    - node_exporter_binary_local_dir | length == 0
-    - not node_exporter_skip_install
-
-- name: Get node_exporter binary checksum
-  when:
-    - node_exporter_binary_local_dir | length == 0
-    - not node_exporter_skip_install
-  block:
-    - name: Get checksum list from github
-      ansible.builtin.set_fact:
-        __node_exporter_checksums: "{{ lookup('url', node_exporter_checksums_url, headers=_github_api_headers, wantlist=True) | list }}"
-      run_once: true
-      until: __node_exporter_checksums is search('linux-' + go_arch + '.tar.gz')
-      retries: 10
-
-    - name: "Get checksum for {{ go_arch }}"
-      ansible.builtin.set_fact:
-        __node_exporter_checksum: "{{ item.split(' ')[0] }}"
-      with_items: "{{ __node_exporter_checksums }}"
-      when:
-        - "('linux-' + go_arch + '.tar.gz') in item"
+  tags:
+    - node_exporter
+    - install
+    - node_exporter_install
+    - download
+    - node_exporter_download

roles/node_exporter/tasks/selinux.yml

@@ -1,23 +0,0 @@
----
-- name: Install selinux python packages [RedHat]
-  ansible.builtin.package:
-    name: "{{ ['libselinux-python', 'policycoreutils-python']
-           if ansible_python_version is version('3', '<') else
-           ['python3-libselinux', 'python3-policycoreutils'] }}"
-    state: present
-  register: _install_selinux_packages
-  until: _install_selinux_packages is success
-  retries: 5
-  delay: 2
-  when: ansible_os_family | lower == "redhat"
-
-- name: Install selinux python packages [clearlinux]
-  ansible.builtin.package:
-    name: sysadmin-basic
-    state: present
-  register: _install_selinux_packages
-  until: _install_selinux_packages is success
-  retries: 5
-  delay: 2
-  when:
-    - ansible_distribution | lower == "clearlinux"

roles/node_exporter/templates/config.yaml.j2

@@ -1,18 +0,0 @@
----
-{{ ansible_managed | comment }}
-{% if node_exporter_tls_server_config | length > 0 %}
-tls_server_config:
-{{ node_exporter_tls_server_config | to_nice_yaml | indent(2, true) }}
-{% endif %}
-
-{% if node_exporter_http_server_config | length > 0 %}
-http_server_config:
-{{ node_exporter_http_server_config | to_nice_yaml | indent(2, true) }}
-{% endif %}
-
-{% if node_exporter_basic_auth_users | length > 0 %}
-basic_auth_users:
-{% for k, v in node_exporter_basic_auth_users.items() %}
-  {{ k }}: {{ v | string | password_hash('bcrypt', ('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890' | shuffle(seed=inventory_hostname) | join)[:22], rounds=9) }}
-{% endfor %}
-{% endif %}

roles/node_exporter/templates/node_exporter.service.j2

@@ -25,9 +25,9 @@ ExecStart={{ node_exporter_binary_install_dir }}/node_exporter \
 {% endfor %}
 {% if node_exporter_tls_server_config | length > 0 or node_exporter_http_server_config | length > 0 or node_exporter_basic_auth_users | length > 0 %}
     {% if node_exporter_version is version('1.5.0', '>=') %}
-    '--web.config.file=/etc/node_exporter/config.yaml' \
+    '--web.config.file={{ node_exporter_config_dir }}/web_config.yml' \
     {% else %}
-    '--web.config=/etc/node_exporter/config.yaml' \
+    '--web.config={{ node_exporter_config_dir }}/web_config.yml' \
     {% endif %}
 {% endif %}
 {% if node_exporter_web_disable_exporter_metrics %}

roles/node_exporter/vars/main.yml

@@ -1,11 +1,9 @@
 ---
-go_arch_map:
-  i386: '386'
-  x86_64: 'amd64'
-  aarch64: 'arm64'
-  armv7l: 'armv7'
-  armv6l: 'armv6'
-
-go_arch: "{{ go_arch_map[ansible_architecture] | default(ansible_architecture) }}"
+_node_exporter_go_ansible_arch: "{{ {'i386': '386',
+                                 'x86_64': 'amd64',
+                                 'aarch64': 'arm64',
+                                 'armv7l': 'armv7',
+                                 'armv6l': 'armv6'}.get(ansible_architecture, ansible_architecture) }}"
 _node_exporter_repo: "prometheus/node_exporter"
 _github_api_headers: "{{ {'GITHUB_TOKEN': lookup('ansible.builtin.env', 'GITHUB_TOKEN')} if (lookup('ansible.builtin.env', 'GITHUB_TOKEN')) else {} }}"
+_node_exporter_binaries: ['node_exporter']