hosts

#!/usr/bin/python

import subprocess as sp
import json

hosts = {}

cmd = ['kubectl', 'get', 'nodes', '-o=jsonpath={.items[*].metadata.name}']
kube_nodes = sp.check_output(cmd).split()

hosts['nfs_clients'] = {
    'hosts': kube_nodes,
    'vars': {
        'ansible_ssh_private_key_file': '~/.ssh/id_rsa',
        'ansible_ssh_user': 'datahub'
    }
}

hosts['nfs_servers'] = {
    'hosts': ['nfsserver'],
    'vars': {
        'ansible_ssh_private_key_file': '~/.ssh/id_rsa',
        'ansible_ssh_user': 'datahub'
    }
}
print(json.dumps(hosts, indent=4, separators=(',', ': ')))