- name: Create DB User
      mysql_user:
        name: dbuser
        host: "{{ item }}"
        password: "{{ mysql_wordpress_password }}"
        priv: "someDB.*:ALL"
      with_items:
        - "{{ ansible_hostname }}"
        - 127.0.0.1
        - ::1
        - localhost
        - "{{ hostvars[groups['webservers']] }}"

TASK [dbservers : Create DB User] *******************************************************************************************************************************************************************
fatal: [10.10.10.13]: FAILED! => {"msg": "ansible.vars.hostvars.HostVars object has no element [u'10.10.10.30', u'10.10.10.240']"}

[webservers]
10.10.10.30
10.10.10.240