---
# Installs InfluxDB and Telegraf as described in:
# https://docs.influxdata.com/influxdb/v1.7/introduction/installation
# https://docs.influxdata.com/influxdb/v1.7/administration/config/
# https://docs.influxdata.com/telegraf/v1.10/introduction/installation/
# https://docs.influxdata.com/telegraf/v1.10/administration/configuration/

- name: Ensure repository key for InfluxDB is in place
  apt_key: url=https://repos.influxdata.com/influxdb.key state=present
  tags:
    - dependencies

- name: Add InfluxDB repository
  apt_repository: repo="deb https://repos.influxdata.com/debian {{ ansible_distribution_release }} stable"
  tags:
    - dependencies

- name: Install InfluxDB and Telegraf from official repository
  apt:
    name: "{{ packages }}"
    state: present
    update_cache: yes
  vars:
    packages:
    - influxdb
    - telegraf
  tags:
    - dependencies

- name: Configure InfluxDB
  template:
    src=etc_influxdb_influxdb.j2
    dest=/etc/influxdb/influxdb.conf
    owner=root
    group=root
  notify: restart influxdb

- name: Create InfluxDB data directories
  file: state=directory path={{ item }} owner=influxdb group=influxdb
  with_items:
    - /data/influxdb
    - /data/influxdb/meta
    - /data/influxdb/data
    - /data/influxdb/wal

- name: Configure Telegraf
  template:
    src=etc_telegraf_telegraf.j2
    dest=/etc/telegraf/telegraf.conf
    owner=root
    group=root
  notify: restart telegraf

- name: Set firewall rules for InfluxDB
  ufw: rule=allow port={{ item }} proto=tcp
  with_items:
    - 8086  # http
    - 8088  # rpc
  tags: ufw

- name: Register new InfluxDB and Telegraf service
  systemd: name={{ item }} daemon_reload=yes enabled=yes
  with_items:
    - influxdb
    - telegraf

- name: Start new InfluxDB and Telegraf instance
  service: name={{ item }} state=started
  with_items:
    - influxdb
    - telegraf