windows: set up windows_exporter

roles/windows/README.md

@@ -1,3 +1,9 @@
 Set up a generic Windows host.
 
 Rename and configure network interfaces. Configure the SSH server.
+
+If `windows_exporter_version` is set, Prometheus [windows_exporter](https://github.com/prometheus-community/windows_exporter) will be installed and configured on port 9100.
+
+Before first run, set the network profile to private and start the SSH server manually with
+
+    start-service sshd

roles/windows/handlers/main.yml

@@ -3,3 +3,9 @@
     name: sshd
     state: restarted
   when: "'handler' not in ansible_skip_tags"
+
+- name: restart windows_exporter
+  win_service:
+    name: windows_exporter
+    state: restarted
+  when: "'handler' not in ansible_skip_tags"

roles/windows/tasks/main.yml

@@ -45,3 +45,7 @@
     name: sshd
     start_mode: auto
     state: started
+
+- name: Install windows-exporter for prometheus metrics
+  when: 'windows_exporter_version is defined'
+  include_tasks: windows_exporter.yml

roles/windows/tasks/windows_exporter.yml

@@ -0,0 +1,25 @@
+- name: Check current windows_exporter version
+  win_command: '"c:\program files\windows_exporter\windows_exporter.exe" --version'
+  failed_when: false
+  changed_when: false
+  register: result
+
+- when: '"stderr" not in result or "version "+windows_exporter_version not in result.stderr'
+  block:
+    - name: Download windows_exporter
+      win_get_url:
+        url: "https://github.com/prometheus-community/windows_exporter/releases/download/v{{ windows_exporter_version }}/windows_exporter-{{ windows_exporter_version }}-amd64.msi"
+        dest: 'c:\windows\temp\windows_exporter.msi'
+        force: true
+
+    - name: Install Windows exporter
+      win_package:
+        path: 'c:\windows\temp\windows_exporter.msi'
+        arguments: "LISTEN_PORT=9100"
+      notify: restart windows_exporter
+
+    - name: Enable windows_exporter service
+      win_service:
+        name: windows_exporter
+        start_mode: delayed
+        state: started