Reference: http://docs.ansible.com/ansible/latest/dev_guide/developing_inventory.html#developing-inventory
{
"group001": {
"hosts": ["host001", "" "host002"],
"vars": {
"var1": true
},
"children": ["group002"]
},
"group002": {
"hosts": ["host003","host004"],
"vars": {
"var2": 500
},
"children":[]
}
"_meta": {
"hostvars": {
"host001": {
"var001" : "value"
},
"host002": {
"var002": "value"
}
}
}
}