On a newly create ubuntu trusty or xenial:

sudo apt update
sudo apt-get -y install git

# To enable password less sudo
sudo visudo
#Add to the end of the file
ubuntu ALL=(ALL) NOPASSWD:ALL

Install NSH enabled OVS
https://github.com/yyang13/ovs_nsh_patches

Install java
sudo apt-get install software-properties-common -y
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer oracle-java8-set-default -y

Install ONOS
Get any latest release of ONOS :  https://wiki.onosproject.org/display/ONOS/Downloads
Running ONOS :
Extract the tar file and goto cd onos-*/apache-karaf-xxx/bin; ./karaf clean
or to run ONOS as a service https://wiki.onosproject.org/display/ONOS/Running+ONOS+as+a+service

Once the onos is started activate the below APPS:
app activate org.onosproject.openflow
app activate org.onosproject.openflow-base
app activate org.onosproject.ovsdb
app activate org.onosproject.drivers.ovsdb
app activate org.onosproject.ovsdbhostprovider
app activate org.onosproject.vtn
externalportname-set -n onos-port

Clone any stable devstack
cd; git clone https://git.openstack.org/openstack-dev/devstack -b stable/pike
cd devstack
Use the below local.conf

[[local|localrc]]
DEST=/opt/stack

# Logging
LOGFILE=$DEST/logs/stack.sh.log
VERBOSE=True
LOG_COLOR=False
SCREEN_LOGDIR=$DEST/logs/screen

# Github's Branch
GLANCE_BRANCH=stable/pike
HORIZON_BRANCH=stable/pike
KEYSTONE_BRANCH=stable/pike
NOVA_BRANCH=stable/pike
NEUTRON_BRANCH=stable/pike
HEAT_BRANCH=stable/pike

HOST_IP=<local ip address>
VNCSERVER_LISTEN=<local ip address>
VNCSERVER_PROXYCLIENT_ADDRESS=<local ip address>

MULTI_HOST=1

#CONTROLLER IP
SERVICE_HOST=<local ip address>

MYSQL_HOST=$SERVICE_HOST
RABBIT_HOST=$SERVICE_HOST
Q_HOST=$SERVICE_HOST
MATCHMAKER_REDIS_HOST=$SERVICE_HOST
DATABASE_TYPE=mysql

MYSQL_PASSWORD=openstack
DATABASE_PASSWORD=openstack
RABBIT_PASSWORD=openstack
ADMIN_PASSWORD=openstack
SERVICE_PASSWORD=openstack
HORIZON_PASSWORD=openstack
SERVICE_TOKEN=openstack
DATABASE_TYPE=mysql

enable_plugin networking-onos https://github.com/openstack/networking-onos.git stable/pike
enable_plugin networking-sfc https://github.com/openstack/networking-sfc.git stable/pike

DEST=/opt/stack
SCREEN_LOGDIR=$DEST/logs/
LOGFILE=${SCREEN_LOGDIR}/xstack.sh.log
LOGDAYS=1
DATABASE_QUERY_LOGGING=False

NOVA_VNC_ENABLED=True
NOVNCPROXY_URL="http://${SERVICE_HOST}:6080/vnc_auto.html"


[[post-config|/$Q_PLUGIN_CONF_FILE]]
[ml2]
mechanism_drivers = onos_ml2

[onos]
url_path = http://onos_ip:8181/onos/vtn
username = <onos user name>
password = <onos password>


do ./clean.sh ; ./stack.sh

Once the openstack is UP,
check whether ONOS and openstack are integrated with the below steps
1. run the command in the compute/controller : sudo ovs-vsctl show
it should show the manager of the switch as onos IP, a br-int bridge with controller as onos ip
2. Create a network in openstack and query it from ONOS curl get http://onos_ip:8181/onos/vtn/networks

If any of the above steps are not satisfied then there is some problem with networking onos integration
debug in the following way:
In /etc/neutron/neutron.conf check for below :
service_plugins = onos_router,flow_classifier,sfc

In  /etc/neutron/plugins/ml2/ml2_conf.ini
mechanism_drivers = onos_ml2

[onos]
password = karaf
username = karaf
url_path = http://onos_ip:8181/onos/vtn

Now restart neutron server, create a network in openstack and check http://onos_ip:8181/onos/vtn/networks

- To integrate with networking sfc
go to the networking sfc cloned folder or clone with git checkout https://github.com/openstack/networking-sfc.git stable/pike
In networking_sfc/services/flowclassifier/common/config.py  and networking_sfc/services/sfc/common/config.py make the below change
+default=['dummy',],
+default=['dummy', 'onos'],

In setup.cfg
 networking_sfc.sfc.drivers =
     dummy = networking_sfc.services.sfc.drivers.dummy.dummy:DummyDriver
-    ovs = networking_sfc.services.sfc.drivers.ovs.driver:OVSSfcDriver
+    onos = networking_onos.services.sfc.driver:OnosSfcDriver
 networking_sfc.flowclassifier.drivers =
     dummy = networking_sfc.services.flowclassifier.drivers.dummy.dummy:DummyDriver
-     ovs = ****
+    onos = networking_onos.services.flowclassifier.driver:OnosFlowClassifierDriver

Run sudo python setup.py install

Ensure the below config changes
In  /etc/neutron/plugins/ml2/ml2_conf.ini and
[agent]
extensions = sfc


In /etc/neutron/neutron.conf check for below :
[sfc]
drivers = onos

[flowclassifier]
drivers = onos

Restart neutron server
Create required VM's
create port pair, port pair group, flowl classifier, port chain.