ansible-playbooks/roles/prometheus/tasks/install.yml

- name: set prometheus_cfg
  set_fact:
    prometheus_cfg: "{{ prometheus_default_config | d({}) | combine(prometheus_config | d({}), recursive=true) }}"


- name: install dependencies
  include_tasks: tasks/install_packages.yml
  vars:
    package:
      - prometheus
      - prometheus-snmp-exporter


- name: create user and group
  include_tasks: tasks/create_user.yml
  vars:
    user:
      name: "{{ prometheus_user }}"
      group: "{{ prometheus_group }}"


- name: create directories
  file:
    path: "{{ item }}"
    state: directory
    mode: 0750
    owner: "{{ prometheus_user }}"
    group: "{{ prometheus_group }}"
  loop:
    - "{{ prometheus_conf_dir }}"
    - "{{ prometheus_data_dir }}"


- name: check if config file exists
  stat:
    path: "{{ prometheus_conf_file }}"
  register: file_exists


- name: slurp existing config file
  slurp:
    src: "{{ prometheus_conf_file }}"
  register: existing_config
  when: file_exists.stat.exists
  no_log: yes


- name: template prometheus config
  template:
    src: config.j2
    dest: "{{ prometheus_conf_file }}"
    force: yes
    mode: 0600
    owner: "{{ prometheus_user }}"
    group: "{{ prometheus_group }}"
  notify: restart prometheus
  when: not file_exists.stat.exists or (existing_config is defined and not (existing_config.content | b64decode) is search('managed by ansible'))


- name: edit prometheus init config
  lineinfile:
    path: /etc/conf.d/prometheus
    regexp: '^{{ item.name }}='
    line: '{{ item.name }}={{ item.value | quote }}'
  notify: restart prometheus
  loop:
    - { name: "prometheus_config_file", value: "{{ prometheus_conf_file }}" }
    - { name: "prometheus_storage_path", value: "{{ prometheus_data_dir }}" }
    - { name: "prometheus_retention_time", value: "{{ prometheus_retention_time | d('15d') }}" }


- name: remove log entries from prometheus init config
  lineinfile:
    path: /etc/conf.d/prometheus
    regexp: '^{{ item }}='
    state: absent
  notify: restart prometheus
  loop:
    - output_log
    - error_log


- name: template prometheus init script
  template:
    src: init.j2
    dest: /etc/init.d/prometheus
    force: yes
    mode: "+x"
  notify: restart prometheus


- name: remove snmp-exporter init config
  file:
    path: /etc/conf.d/snmp-exporter
    state: absent
  notify: restart snmp-exporter


- name: template snmp-exporter init script
  template:
    src: snmp_init.j2
    dest: /etc/init.d/snmp-exporter
    force: yes
    mode: "+x"
  notify: restart snmp-exporter


- name: add prometheus metric target
  include_role:
    name: prometheus
  vars:
    function: add_target
    target:
      name: self
      url: /metrics
      use_ip: yes
      ip: 127.0.0.1
      port: "{{ prometheus_port }}"


- name: install and configure nginx
  include_role:
    name: nginx
  vars:
    nginx:
      servers:
        - conf: nginx_server
      certs: "{{ host_tls }}"


- name: flush handlers
  meta: flush_handlers


- name: add directories to backup plan
  include_role:
    name: backup
  vars:
    function: add
    backup_items:
      - "{{ prometheus_conf_dir }}"


- name: enable and start services
  service:
    name: "{{ item }}"
    enabled: yes
    state: started
  loop:
    - snmp-exporter
    - prometheus