sample_inventory.yml

---
all:
  children:
    whois:
      children:
        site1:
          children:
            site1_odd:
              hosts:
                whoisrws1.site1.example.com:
                whoisrws3.site1.example.com:
                whoisrws5.site1.example.com:
            site1_even:
              hosts:
                whoisrws2.site1.example.com:
                whoisrws4.site1.example.com:
                whoisrws6.site1.example.com:
        site2:
          children:
            site2_odd:
              hosts:
                whoisrws1.site2.example.com:
                whoisrws3.site2.example.com:
                whoisrws5.site2.example.com:
            site2_even:
              hosts:
                whoisrws2.site2.example.com:
                whoisrws4.site2.example.com:
                whoisrws6.site2.example.com:
        site3:
          children:
            site3_odd:
              hosts:
                whoisrws1.site3.example.com:
                whoisrws3.site3.example.com:
                whoisrws5.site3.example.com:
            site3_even:
              hosts:
                whoisrws2.site3.example.com:
                whoisrws4.site3.example.com:
                whoisrws6.site3.example.com:
        even:
          children:
            site2_even:
            site1_even:
            site3_even:
        odd:
          children:
            site2_odd:
            site1_odd:
            site3_odd: