Prometheus: first bits of a role.

prometheus/defaults/main.yml

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+---
+prometheus_install: True
+prometheus_version: 2.0.0
+prometheus_dir: 'prometheus-{{ prometheus_version }}.linux-amd64'
+prometheus_file: '{{ prometheus_dir }}.tar.gz'
+prometheus_download_url: 'https://github.com/prometheus/prometheus/releases/download/v{{ prometheus_version }}/{{ prometheus_file }}'
+prometheus_user: prometheus
+prometheus_home: /opt/prometheus
+prometheus_dist_dir: '{{ prometheus_home }}/dist'
+prometheus_confdir: '/opt/prometheus/conf'
+prometheus_cmd: '{{ prometheus_dist_dir }}/{{ prometheus_dir }}/prometheus'
+prometheus_loglevel: info
+prometheus_http_port: 9090

prometheus/files/prometheus.upstart

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+description "Prometheus"
+start on (local-filesystems and net-device-up IFACE!=lo)
+stop on runlevel [016]
+
+respawn
+respawn limit 10 5
+setuid prometheus
+setgid prometheus
+
+script
+  . /etc/default/prometheus
+  export GOMAXPROCS
+  export PROMETHEUS_CMD
+  export PROMETHEUS_LOGDIR
+  export PROMETHEUS_DATADIR
+  export PROMETHEUS_LOGLEVEL
+  export PROMETHEUS_CONF
+  exec $PROMETHEUS_CMD --config.file=$PROMETHEUS_CONF --storage.tsdb.path="$PROMETHEUS_DATADIR" --log.level=$PROMETHEUS_LOGLEVEL > $PROMETHEUS_LOGDIR/prometheus.log 2>&1
+end script
+ 

prometheus/handlers/main.yml

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+---
+- name: Restart prometheus
+  service: name=prometheus state=restarted
+
+- name: Reload prometheus
+  service: name=prometheus state=reloaded

prometheus/meta/main.yml

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+---
+dependencies:
+  - role: '../../library/roles/nginx'

prometheus/tasks/main.yml

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+---
+- block:
+    - name: Create the user under prometheus will run
+      user: name={{ prometheus_user }} home={{ prometheus_home }} createhome=no shell=/usr/sbin/nologin system=yes
+      
+    - name: Create the prometheus server base and conf directories
+      file: dest={{ item }} state=directory owner=root group=root
+      with_items:
+        - '{{ prometheus_home }}'
+        - '{{ prometheus_confdir }}'
+        - '{{ prometheus_dist_dir }}'
+
+    - name: Create the prometheus directory structure
+      file: dest={{ prometheus_home }}/{{ item }} state=directory owner={{ prometheus_user }} group={{ prometheus_user }}
+      with_items:
+        - data
+        - logs
+
+    - name: Download prometheus
+      get_url: url={{ prometheus_download_url }} dest=/srv/
+
+    - name: Unarchive the prometheus distribution
+      unarchive: src=/srv/{{ prometheus_file }} dest={{ prometheus_dist_dir }} remote_src=yes 
+      args:
+        creates: '{{ prometheus_dist_dir }}/{{ prometheus_dir }}/prometheus'
+      notify: Restart prometheus
+
+    - name: Install the prometheus configuration
+      template: src=prometheus.yml.j2 dest={{ prometheus_confdir }}/prometheus.yml
+      notify: Reload prometheus
+
+    - name: Install the prometheus upstart script
+      copy: src=prometheus.upstart dest=/etc/init/prometheus.conf mode=0644 owner=root group=root
+
+    - name: Install the prometheus defaults
+      template: src=prometheus.default.j2 dest=/etc/default/prometheus mode=0644 owner=root group=root
+
+    - name: Ensure that prometheus is started and enabled
+      service: name=prometheus state=started enabled=yes
+
+  tags: prometheus
+  when: prometheus_install
+
+- block:
+    - name: Ensure that prometheus is stopped and disabled
+      service: name=prometheus state=stopped enabled=no
+
+    - name: Remove the prometheus init script
+      file: dest=/etc/init/prometheus.conf state=absent
+
+    - name: Remove all the prometheus files
+      file: dest={{ prometheus_home }} state=absent
+
+  tags: prometheus
+  when: not prometheus_install

prometheus/templates/prometheus.default.j2

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+GOMAXPROCS={{ ansible_processor_vcpus }}
+PROMETHEUS_CMD={{ prometheus_cmd }}
+PROMETHEUS_LOGDIR={{ prometheus_home }}/logs
+PROMETHEUS_DATADIR={{ prometheus_home }}/data
+PROMETHEUS_LOGLEVEL={{ prometheus_loglevel }}
+PROMETHEUS_CONF={{ prometheus_confdir }}/prometheus.yml
+
+

prometheus/templates/prometheus.yml.j2

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+# my global config
+global:
+  scrape_interval:     15s # Set the scrape interval to every 15 seconds. Default is every 1 minute.
+  evaluation_interval: 15s # Evaluate rules every 15 seconds. The default is every 1 minute.
+  # scrape_timeout is set to the global default (10s).
+
+# Alertmanager configuration
+alerting:
+  alertmanagers:
+  - static_configs:
+    - targets:
+      # - alertmanager:9093
+
+# Load rules once and periodically evaluate them according to the global 'evaluation_interval'.
+rule_files:
+  # - "first_rules.yml"
+  # - "second_rules.yml"
+
+# A scrape configuration containing exactly one endpoint to scrape:
+# Here it's Prometheus itself.
+scrape_configs:
+  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
+  - job_name: 'prometheus'
+
+    # metrics_path defaults to '/metrics'
+    # scheme defaults to 'http'.
+
+    static_configs:
+      - targets: ['localhost:9090']

prometheus/vars/main.yml

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+---
+nginx_letsencrypt_managed: True
+nginx_use_common_virthost: True
+nginx_virthosts:
+  - virthost_name: '{{ ansible_fqdn }}'
+    listen: '{{ http_port }}'
+    server_name: '{{ ansible_fqdn }}'
+    server_aliases: ''
+    index: index.html
+    ssl_enabled: True
+    ssl_only: True
+    ssl_letsencrypt_certs: '{{ nginx_letsencrypt_managed }}'
+    root: '{{ nginx_webroot }}'
+    server_tokens: 'off'
+    proxy_standard_setup: True
+    locations:
+      - location: /
+        target: http://localhost:{{ prometheus_http_port }}
+
+