r/vmagent: Deploy vmagent

The *vmagent* role installs and configures the scraping and routing
agent used in the Victoria Metrics ecosystem.

roles/vmagent/tasks/deploy.yml

@@ -0,0 +1,62 @@
+- 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 /etc/sysconfig directory exists
+  file:
+    path: /etc/sysconfig
+    mode: u=rwx,go=rx
+    owner: root
+    group: root
+    state: directory
+  tags:
+  - config
+- name: ensure vmagent is configured
+  template:
+    src: vmagent.sysconfig.j2
+    dest: /etc/sysconfig/vmagent
+    mode: '0644'
+  notify:
+  - restart vmagent
+  tags:
+  - config
+
+- name: ensure victoria metrics config directory exists
+  file:
+    path: /etc/victoria-metrics
+    mode: '0755'
+    state: directory
+  tags:
+  - config
+- name: ensure vmagent scrape configuration is set
+  copy:
+    dest: /etc/victoria-metrics/scrape.yml
+    content: '{{ vmagent_config|to_nice_yaml(indent=2) }}'
+    mode: '0644'
+  notify:
+  - reload vmagent
+  tags:
+  - config
+  - scrape-config
+
+- name: ensure vmagent starts at boot
+  service:
+    name: vmagent
+    enabled: true
+  tags:
+  - service
+  - systemd
+- name: ensure vmagent is running
+  service:
+    name: vmagent
+    state: started
+  tags:
+  - service
+  - systemd

roles/vmagent/tasks/install.yml

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+- name: ensure vmagent systemd unit is installed
+  copy:
+    src: vmagent.service
+    dest: /etc/systemd/system/vmagent.service
+    mode: '0644'
+  notify:
+  - reload systemd
+  - restart vmagent
+  tags:
+  - service
+  - systemd

roles/vmagent/tasks/main.yml

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+- block:
+  - import_tasks: install.yml
+    tags:
+    - install
+  - import_tasks: deploy.yml
+  tags:
+  - vmagent