validations-common/validations_common/roles/undercloud_ram/tasks/main.yml

---
- name: Verify the RAM requirements
  fail:
    msg: >-
      The RAM on the undercloud node is {{ ansible_memtotal_mb }} MB,
      the minimal recommended value is
      {{ min_undercloud_ram_gb|int * 1024 }} MB.      
  # NOTE(shadower): converting GB to MB
  failed_when: "(ansible_memtotal_mb) < min_undercloud_ram_gb|int * 1024"