r/v-m: Add role for Victoria Metrics

The *victoria-metrics* role deploys a single-server instance of the
Victoria Metrics time series database server.  It installs the selected
version by downloading the binary release from Github and copying it to
`/usr/local/sbin` on the managed node.  Scrape configuration is optional
and can be specified with the `scrape_configs` variable.

roles/victoria-metrics/defaults/main.yml

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+vm_version: 1.72.0
+
+vm_retention_period: 12
+vm_self_scrape: true
+vm_self_scrape_interval: '{{ vm_default_scrape_interval|d("1m") }}'
+
+vm_scrape_configs: []
+
+vm_config:
+  global:
+    scrape_interval: 1m
+
+  scrape_configs: "{{ vm_scrape_configs }}"

roles/victoria-metrics/files/victoria-metrics.service

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+[Unit]
+Description=VictoriaMetrics
+
+[Service]
+Type=exec
+Environment=httpListenAddr=[::1]:8428
+Environment=storageDataPath=/var/lib/victoria-metrics/data
+Environment=loggerDisableTimestamps=true
+EnvironmentFile=-/etc/sysconfig/victoria-metrics
+ExecStart=/usr/local/sbin/victoria-metrics -enableTCP6 -envflag.enable
+User=victoriametrics
+LimitNOFILE=1048576
+
+[Install]
+WantedBy=multi-user.target

roles/victoria-metrics/handlers/main.yml

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+- name: reload systemd
+  systemd:
+    daemon_reload: true
+
+- name: restart victoria-metrics
+  service:
+    name: victoria-metrics
+    state: restarted
+
+- name: reload victoria-metrics
+  uri:
+    url: http://localhost:8428/-/reload
+    status_code: 204
+  changed_when: true

roles/victoria-metrics/tasks/deploy.yml

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+- name: ensure victoria metrics user exists
+  user:
+    name: victoriametrics
+    system: true
+    home: /var/lib/victoria-metrics
+    createhome: false
+    shell: /sbin/nologin
+    state: present
+  tags:
+  - user
+
+- name: ensure victoria metrics data data directory exists
+  file:
+    path: /var/lib/victoria-metrics
+    owner: victoriametrics
+    group: victoriametrics
+    mode: u=rwx,go=rx
+    state: directory
+  tags:
+  - datadir
+
+- name: ensure /etc/sysconfig directory exists
+  file:
+    path: /etc/sysconfig
+    mode: u=rwx,go=rx
+    owner: root
+    group: root
+    state: directory
+  tags:
+  - config
+- name: ensure victoria metrics is configured
+  template:
+    src: victoria-metrics.sysconfig.j2
+    dest: /etc/sysconfig/victoria-metrics
+    mode: '0644'
+  notify:
+  - restart victoria-metrics
+  tags:
+  - config
+
+- name: ensure victoria metrics config directory exists
+  file:
+    path: /etc/victoria-metrics
+    mode: '0755'
+    state: directory
+  tags:
+  - config
+- name: ensure victoria metrics scrape configuration is set
+  copy:
+    dest: /etc/victoria-metrics/scrape.yml
+    content: '{{ vm_config|to_nice_yaml(indent=2) }}'
+    mode: '0644'
+  when: vm_config is not none
+  notify:
+  - reload victoria-metrics
+  tags:
+  - config
+  - scrape-config
+
+- name: ensure victoria metrics starts at boot
+  service:
+    name: victoria-metrics
+    enabled: true
+  tags:
+  - service
+  - systemd
+- name: ensure victoria metrics is running
+  service:
+    name: victoria-metrics
+    state: started
+  tags:
+  - service
+  - systemd

roles/victoria-metrics/tasks/install.yml

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+- name: load installation variables
+  include_vars: install.yml
+
+- name: load architecture variables
+  include_vars: '{{ item }}'
+  with_first_found:
+  - '{{ ansible_architecture }}.yml'
+  - arch-defaults.yml
+
+- name: ensure victoria metrics release archive is available
+  delegate_to: localhost
+  become: false
+  get_url:
+    url: '{{ vm_tar_url }}'
+    checksum: 'sha256:{{ vm_cksm_url }}'
+    dest: '{{ playbook_dir }}/{{ vm_tar_name }}'
+  tags:
+  - download
+
+- name: ensure victoria metrics unpack dir exists locally
+  delegate_to: localhost
+  become: false
+  file:
+    path: '{{ vm_extract_dir }}'
+    mode: '0755'
+    state: directory
+  tags:
+  - unarchive
+
+- name: ensure victoria metrics archive is unpacked locally
+  delegate_to: localhost
+  become: false
+  unarchive:
+    src: '{{ playbook_dir }}/{{ vm_tar_name }}'
+    dest: '{{ vm_extract_dir }}'
+    remote_src: true
+    creates: '{{ vm_extract_dir }}/victoria-metrics-prod'
+  tags:
+  - unarchive
+
+- name: ensure victoria metrics is installed
+  copy:
+    src: '{{ vm_extract_dir }}/victoria-metrics-prod'
+    dest: /usr/local/sbin/victoria-metrics
+    mode: '0755'
+  diff: false
+  notify:
+  - restart victoria-metrics
+
+- name: ensure victoria metrics systemd unit is installed
+  file:
+    src: victoria-metrics.service
+    dest: /etc/systemd/system/victoria-metrics.service
+    mode: '0644'
+  notify:
+  - reload systemd
+  - restart victoria-metrics
+  tags:
+  - service
+  - systemd
+

roles/victoria-metrics/tasks/main.yml

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+- block:
+  - import_tasks: install.yml
+    tags:
+    - install
+  - import_tasks: deploy.yml
+  tags:
+  - victoria-metrics

roles/victoria-metrics/templates/victoria-metrics.sysconfig.j2

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+retentionPeriod={{ vm_retention_period }}
+{% if vm_self_scrape|bool %}
+selfScrapeInterval={{ vm_self_scrape_interval }}
+{% endif %}
+{% if vm_config is not none %}
+promscrape_config=/etc/victoria-metrics/scrape.yml
+{% endif %}

roles/victoria-metrics/vars/aarch64.yml

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+vm_arch: arm64
+

roles/victoria-metrics/vars/arch-defaults.yml

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+vm_arch: '{{ ansible_architecture }}'

roles/victoria-metrics/vars/install.yml

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+vm_base_url:
+  https://github.com/VictoriaMetrics/VictoriaMetrics/releases/download
+vm_tar_name: victoria-metrics-{{ vm_arch }}-v{{ vm_version }}.tar.gz
+vm_tar_url: >-
+  {{ vm_base_url }}/v{{ vm_version }}/{{ vm_tar_name }}
+vm_cksm_url: >-
+  {{ vm_base_url }}/v{{ vm_version }}/victoria-metrics-{{ vm_arch }}-v{{ vm_version }}_checksums.txt
+vm_extract_dir: >-
+  {{ playbook_dir }}/victoria-metrics-{{ vm_arch }}-v{{ vm_version }}

roles/victoria-metrics/vars/x86_64.yml

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+vm_arch: amd64