nova.conf file ....
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[DEFAULT]
verbose = True
network_api_class = nova.network.neutronv2.api.API
security_group_api = neutron
linuxnet_interface_driver = nova.network.linux_net.NeutronLinuxBridgeInterfaceDriver
firewall_driver = nova.virt.firewall.NoopFirewallDriver
my_ip = 172.168.1.101
auth_strategy = keystone
rpc_backend = rabbit
dhcpbridge_flagfile=/etc/nova/nova.conf
dhcpbridge=/usr/bin/nova-dhcpbridge
logdir=/var/log/nova
state_path=/var/lib/nova
lock_path=/var/lock/nova
force_dhcp_release=True
libvirt_use_virtio_for_bridges=True
verbose=True
ec2_private_dns_show_ip=True
api_paste_config=/etc/nova/api-paste.ini
enabled_apis=osapi_compute,metadata
firewall_driver=nova.virt.firewall.NoopFirewallDriver
ram_allocation_ratio=1.0
reserved_host_memory_mb=0
scheduler_use_baremetal_filters=True
scheduler_tracks_instance_changes=False
#compute_driver=nova.virt.ironic.IronicDriver
compute_driver=libvirt.LibvirtDriver
firewall_driver=nova.virt.firewall.NoopFirewallDriver
scheduler_host_manager=nova.scheduler.ironic_host_manager.IronicHostManager
ram_allocation_ratio=2
reserved_host_memory_mb=0
compute_manager=ironic.nova.compute.manager.ClusteredComputeManager
scheduler_use_baremetal_filters=True
scheduler_tracks_instance_changes=False
cpu_allocation_ratio=20

[ironic]

# Ironic keystone admin name
admin_username=ironic

#Ironic keystone admin password.
admin_password=ironic123

# keystone API endpoint
admin_url=http://controller:35357/v2.0

# Ironic keystone tenant name.
admin_tenant_name=service

# URL for Ironic API endpoint.
api_endpoint=http://controller:6385/v1


[database]
connection = mysql+pymysql://nova:nova123@controller/nova

[oslo_messaging_rabbit]
rabbit_host = controller
rabbit_userid = openstack
rabbit_password = rabbit123

[keystone_authtoken]
auth_uri = http://controller:5000
auth_url = http://controller:35357
auth_plugin = password
project_domain_id = default
user_domain_id = default
project_name = service
username = nova
password = nova123

[vnc]
vncserver_listen = $my_ip
vnc_enabled=True
vncserver_listen = 0.0.0.0
vncserver_proxyclient_address = $my_ip
vncserver_proxyclient_address = $my_ip

[glance]
host = controller

[oslo_concurrency]
lock_path = /var/lib/nova/tmp

[neutron]
url = http://controller:9696
auth_url = http://controller:35357
auth_plugin = password
project_domain_id = default
user_domain_id = default
region_name = RegionOne
project_name = service
username = neutron
password = neutron123
service_metadata_proxy = True
metadata_proxy_shared_secret = bahubali

nova-compute file .....
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[DEFAULT]
compute_driver=libvirt.LibvirtDriver