Install node_exporter to enable monitoring

hosts

@@ -3,8 +3,4 @@ gw11.regensburg.freifunk.net
 gw21.regensburg.freifunk.net
 gw31.regensburg.freifunk.net
 confluence.regensburg.freifunk.net
-
-[gw]
-gw11.regensburg.freifunk.net
-gw21.regensburg.freifunk.net
-gw31.regensburg.freifunk.net
+unms.ffrgb ansible_host=10.90.224.101

roles/node_exporter/defaults/main.yml

@@ -0,0 +1,4 @@
+---
+
+node_exporter_version: 0.16.0
+node_exporter_url: https://github.com/prometheus/node_exporter/releases/download/v{{ node_exporter_version }}/node_exporter-{{ node_exporter_version }}.linux-amd64.tar.gz

roles/node_exporter/files/node_exporter

@@ -0,0 +1 @@
+OPTIONS=""

roles/node_exporter/handlers/main.yml

@@ -0,0 +1,6 @@
+---
+- name: Restart node_exporter
+  service: name=node_exporter state=restarted
+
+- name: Reload systemd
+  command: systemctl daemon-reload

roles/node_exporter/tasks/main.yml

@@ -0,0 +1,19 @@
+---
+
+- name: Create user
+  user: name=node_exporter
+
+- name: Unpack node_exporter
+  unarchive: src="{{ node_exporter_url }}" remote_src=yes dest=/opt/ creates=/opt/node_exporter-{{ node_exporter_version }}.linux-amd64/node_exporter
+
+- name: Configure node_exporter
+  copy: src=node_exporter dest=/etc/default/node_exporter
+
+- name: Install systemd unit
+  template: src=node_exporter.service.j2 dest=/lib/systemd/system/node_exporter.service
+  notify:
+  - Reload systemd
+  - Restart node_exporter
+
+- name: Enable node_exporter
+  service: name=node_exporter enabled=yes

roles/node_exporter/templates/node_exporter.service.j2

@@ -0,0 +1,10 @@
+[Unit]
+Description=Node Exporter
+
+[Service]
+User=node_exporter
+EnvironmentFile=/etc/default/node_exporter
+ExecStart=/opt/node_exporter-{{ node_exporter_version }}.linux-amd64/node_exporter $OPTIONS
+
+[Install]
+WantedBy=multi-user.target

site.yml

@@ -6,6 +6,7 @@
   - common
   - apt
   - ntp
+  - node_exporter
 
 - name: Setup gateway servers
   hosts: [gw11.regensburg.freifunk.net, gw21.regensburg.freifunk.net, gw31.regensburg.freifunk.net]