Add prometheus role (with node exporter)

6 files changed, 126 insertions, 0 deletions

diff --git a/roles/prometheus/defaults/main.yml b/roles/prometheus/defaults/main.yml
new file mode 100644
index 00000000..a9f9213c
--- /dev/null
+++ b/roles/prometheus/defaults/main.yml
@@ -0,0 +1,5 @@
+---
+prometheus_port: 9090
+prometheus_retention: "15d"
+prometheus_scrape_interval: "30s"
+prometheus_node_exporter_port: 9100
diff --git a/roles/prometheus/handlers/main.yml b/roles/prometheus/handlers/main.yml
new file mode 100644
index 00000000..d35a8531
--- /dev/null
+++ b/roles/prometheus/handlers/main.yml
@@ -0,0 +1,6 @@
+---
+- name: "Restart prometheus"
+  become: true
+  ansible.builtin.systemd_service:
+    name: "prometheus"
+    state: "restarted"
diff --git a/roles/prometheus/meta/argument_specs.yml b/roles/prometheus/meta/argument_specs.yml
new file mode 100644
index 00000000..72ec6819
--- /dev/null
+++ b/roles/prometheus/meta/argument_specs.yml
@@ -0,0 +1,26 @@
+---
+argument_specs:
+  main:
+    short_description: "Install and configure Prometheus monitoring system"
+    description: "Install and configure Prometheus monitoring system"
+    options:
+      prometheus_port:
+        description: "Port for Prometheus web interface"
+        type: "int"
+        default: 9090
+      prometheus_retention:
+        description: "Data retention period for Prometheus"
+        type: "str"
+        default: "15d"
+      prometheus_scrape_interval:
+        description: "Global scrape interval for metrics collection"
+        type: "str"
+        default: "15s"
+      prometheus_evaluation_interval:
+        description: "Interval for evaluating rules"
+        type: "str"
+        default: "15s"
+      node_exporter_port:
+        description: "Port for node-exporter metrics endpoint"
+        type: "int"
+        default: 9100
diff --git a/roles/prometheus/meta/main.yml b/roles/prometheus/meta/main.yml
new file mode 100644
index 00000000..9ac4e138
--- /dev/null
+++ b/roles/prometheus/meta/main.yml
@@ -0,0 +1,18 @@
+---
+dependencies: []
+galaxy_info:
+  author: "a14m"
+  description: "Install lightweight Prometheus and Node Exporter for monitoring"
+  company: "kartoffeln.work GmbH."
+  license: "MIT"
+  min_ansible_version: "2.18"
+  platforms:
+    - name: "ArchLinux"
+      versions:
+        - "all"
+    - name: "Ubuntu"
+      versions:
+        - "noble"
+    - name: "Debian"
+      versions:
+        - "bookworm"
diff --git a/roles/prometheus/tasks/main.yml b/roles/prometheus/tasks/main.yml
new file mode 100644
index 00000000..9feeacaf
--- /dev/null
+++ b/roles/prometheus/tasks/main.yml
@@ -0,0 +1,55 @@
+---
+- name: "Create prometheus group"
+  become: true
+  ansible.builtin.group:
+    name: "prometheus"
+    system: true
+
+- name: "Create prometheus user"
+  become: true
+  ansible.builtin.user:
+    name: "prometheus"
+    group: "prometheus"
+    system: true
+    shell: "/usr/sbin/nologin"
+    create_home: false
+
+- name: "Create prometheus directories"
+  become: true
+  ansible.builtin.file:
+    path: "{{ item }}"
+    state: "directory"
+    owner: "prometheus"
+    group: "prometheus"
+    mode: "0755"
+  with_items:
+    - "/etc/prometheus"
+    - "/var/lib/prometheus"
+
+- name: "Install prometheus packages"
+  become: true
+  ansible.builtin.package:
+    name:
+      - "prometheus"
+      - "prometheus-node-exporter"
+    state: "present"
+
+- name: "Create prometheus configuration"
+  become: true
+  ansible.builtin.template:
+    src: "prometheus.yml.j2"
+    dest: "/etc/prometheus/prometheus.yml"
+    owner: "prometheus"
+    group: "prometheus"
+    mode: "0644"
+  notify: "Restart prometheus"
+
+- name: "Start and enable prometheus services"
+  become: true
+  ansible.builtin.systemd_service:
+    name: "prometheus"
+    state: "started"
+    enabled: true
+  with_items:
+    - "prometheus"
+    - "prometheus-node-exporter"
diff --git a/roles/prometheus/templates/prometheus.yml.j2 b/roles/prometheus/templates/prometheus.yml.j2
new file mode 100644
index 00000000..e39a69c0
--- /dev/null
+++ b/roles/prometheus/templates/prometheus.yml.j2
@@ -0,0 +1,16 @@
+global:
+  scrape_interval: {{ prometheus_scrape_interval }}
+  evaluation_interval: {{ prometheus_scrape_interval }}
+
+rule_files:
+
+scrape_configs:
+  - job_name: 'prometheus'
+    static_configs:
+      - targets: ['localhost:{{ prometheus_port }}']
+
+  - job_name: 'node'
+    static_configs:
+      - targets: ['localhost:{{ prometheus_node_exporter_port }}']
+    scrape_interval: {{ prometheus_scrape_interval }}
+    metrics_path: /metrics