ajout d'un role pour configurer des nodes prometheus (config node exporter basique)

README.md

@@ -83,6 +83,18 @@ Yet another ansible's playbook repository
  * generate ed25519 keys for server instead of RSA
  * configure ssh client to use strong algorithms
  * will create compatibility problem with old ssh versions (openwrt, old putty, debian wheezy)
+* prometheus_nodexporter : allow configuration for node with prometheus node-exporter
+ * debian 9 and centos 7 compatible
+ * You can configure prometheus_exporter_listen_address (default 0.0.0.0) and prometheus_exporter_listen_port (default 9100)
+ * use file_sd_configs on prometheus server with prometheus_sd_directory (default to /etc/prometheus/nodes/) :
+```
+   - job_name: 'node'
+    file_sd_configs:
+      - files:
+        - '{{ prometheus_sd_directory }}/*.json'
+        - '{{ prometheus_sd_directory }}/*.yml'
+        - '{{ prometheus_sd_directory }}/*.yaml'
+```
 
 ## example host file
 =====

prometheus_nodexporter.yml

@@ -0,0 +1,8 @@
+---
+
+- name: Configure prometheus node to be used with server
+  hosts: all
+  user: root
+  gather_facts: yes
+  roles:
+    - prometheus_nodexporter

roles/prometheus_nodexporter/defaults/main.yml

@@ -0,0 +1,5 @@
+---
+
+prometheus_exporter_listen_address: "0.0.0.0"
+prometheus_exporter_listen_port: "9100"
+prometheus_sd_directory: "/etc/prometheus/nodes/"

roles/prometheus_nodexporter/handlers/main.yml

@@ -0,0 +1,10 @@
+- name: restart exporter
+  systemd: state=restarted name= {{ prometheus_exporter_service }}
+
+- name: enable exporter
+  systemd: enabled=yes name={{ prometheus_exporter_service }}
+
+- name: reload server
+  uri: 
+    url: "http://{{ prometheus_server }}:9090/-/reload"
+    method: POST

roles/prometheus_nodexporter/tasks/centos.yml

@@ -0,0 +1,2 @@
+---
+

roles/prometheus_nodexporter/tasks/debian.yml

@@ -0,0 +1,9 @@
+---
+
+- name: enable exporter on listen address
+  lineinfile: 
+    path: /etc/default/prometheus-node-exporter
+    regexp: '^ARGS=(.*) \\'
+    backrefs: yes
+    line: 'ARGS=\1 -web.listen-address {{ prometheus_exporter_listen_address }}:{{ prometheus_exporter_listen_port }} \\'
+  notify: restart exporter

roles/prometheus_nodexporter/tasks/main.yml

@@ -0,0 +1,33 @@
+---
+
+# Role to deploy prometheus node and add them to a prometheus server
+
+- name: Import OS variables
+  include_vars: "{{ ansible_os_family }}.yml"
+
+- name: install node exporter
+  package:
+    name: "{{ prometheus_exporter_package }}"
+    state: latest
+  notify: enable exporter
+
+- import_tasks: debian.yml
+  when: ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu'
+- import_tasks: redhat.yml
+  when: ansible_distribution == 'CentOS' or ansible_distribution == 'CloudLinux' or ansible_distribution == 'Virtuozzo'
+
+- name: import discovery file to server
+  template:
+    src: sd_file.yml.j2
+    dest: "{{ prometheus_sd_directory }}/{{ ansible_nodename }}.yml"
+  delegate_to: "{{ prometheus_server }}"
+
+- name: add nodename to server hosts
+  lineinfile:
+    path: /etc/hosts
+    regexp: '{{ prometheus_exporter_listen_address }} {{ ansible_nodename }}'
+    state: present
+    line: '{{ prometheus_exporter_listen_address }} {{ ansible_nodename }}'
+  delegate_to: "{{ prometheus_server }}"
+  when: prometheus_exporter_listen_address is defined and prometheus_exporter_listen_address != "0.0.0.0"
+  notify: reload server

roles/prometheus_nodexporter/tasks/redhat.yml

@@ -0,0 +1,9 @@
+---
+
+- name: enable exporter on listen address
+  lineinfile: 
+    path: /etc/sysconfig/node_exporter
+    regexp: '^LISTEN_ADDRESS='
+    backrefs: yes
+    line: 'LISTEN_ADDRESS="{{ prometheus_exporter_listen_address }}:{{ prometheus_exporter_listen_port }}"'
+  notify: restart exporter

roles/prometheus_nodexporter/templates/sd_file.yml.j2

@@ -0,0 +1,2 @@
+- targets:
+  - "{{ ansible_nodename }}:{{ prometheus_exporter_listen_port }}"

roles/prometheus_nodexporter/vars/Debian.yml

@@ -0,0 +1,6 @@
+---
+
+# Prometheus variables for Debian
+
+prometheus_exporter_package: "prometheus-node-exporter"
+prometheus_exporter_service: "prometheus-node-exporter.service"

roles/prometheus_nodexporter/vars/RedHat.yml

@@ -0,0 +1,6 @@
+---
+
+# Prometheus variables for RedHat
+
+prometheus_exporter_package: "prometheus-node_exporter"
+prometheus_exporter_service: "node_exporter.service"

roles/prometheus_nodexporter/vars/Virtuozzo.yml

@@ -0,0 +1 @@
+RedHat.yml