devstack/doc/source/guides/devstack-with-lbaas-v2.rst

Configure Load-Balancer Version 2

Starting in the OpenStack Liberty release, the neutron LBaaS v2 API is now stable while the LBaaS v1 API has been deprecated. The LBaaS v2 reference driver is based on Octavia.

Phase 1: Create DevStack + 2 nova instances

First, set up a vm of your choice with at least 8 GB RAM and 16 GB disk space, make sure it is updated. Install git and any other developer tools you find useful.

Install devstack

git clone https://git.openstack.org/openstack-dev/devstack
cd devstack

Edit your local.conf to look like

[[local|localrc]]
# Load the external LBaaS plugin.
enable_plugin neutron-lbaas https://git.openstack.org/openstack/neutron-lbaas
enable_plugin octavia https://git.openstack.org/openstack/octavia

# ===== BEGIN localrc =====
DATABASE_PASSWORD=password
ADMIN_PASSWORD=password
SERVICE_PASSWORD=password
RABBIT_PASSWORD=password
# Enable Logging
LOGFILE=$DEST/logs/stack.sh.log
VERBOSE=True
LOG_COLOR=True
# Pre-requisite
ENABLED_SERVICES=rabbit,mysql,key
# Horizon
ENABLED_SERVICES+=,horizon
# Nova
ENABLED_SERVICES+=,n-api,n-cpu,n-cond,n-sch
# Glance
ENABLED_SERVICES+=,g-api,g-reg
# Neutron
ENABLED_SERVICES+=,q-svc,q-agt,q-dhcp,q-l3,q-meta
# Enable LBaaS v2
ENABLED_SERVICES+=,q-lbaasv2
ENABLED_SERVICES+=,octavia,o-cw,o-hk,o-hm,o-api
# Cinder
ENABLED_SERVICES+=,c-api,c-vol,c-sch
# Tempest
ENABLED_SERVICES+=,tempest
# ===== END localrc =====

Run stack.sh and do some sanity checks

./stack.sh
. ./openrc

openstack network list  # should show public and private networks

Create two nova instances that we can use as test http servers:

#create nova instances on private network
nova boot --image $(nova image-list | awk '/ cirros-.*-x86_64-uec / {print $2}') --flavor 1 --nic net-id=$(openstack network list | awk '/ private / {print $2}') node1
nova boot --image $(nova image-list | awk '/ cirros-.*-x86_64-uec / {print $2}') --flavor 1 --nic net-id=$(openstack network list | awk '/ private / {print $2}') node2
nova list # should show the nova instances just created

#add secgroup rules to allow ssh etc..
openstack security group rule create default --protocol icmp
openstack security group rule create default --protocol tcp --dst-port 22:22
openstack security group rule create default --protocol tcp --dst-port 80:80

Set up a simple web server on each of these instances. ssh into each instance (username 'cirros', password 'cubswin:)') and run

MYIP=$(ifconfig eth0|grep 'inet addr'|awk -F: '{print $2}'| awk '{print $1}')
while true; do echo -e "HTTP/1.0 200 OK\r\n\r\nWelcome to $MYIP" | sudo nc -l -p 80 ; done&

Phase 2: Create your load balancers

neutron lbaas-loadbalancer-create --name lb1 private-subnet
neutron lbaas-loadbalancer-show lb1  # Wait for the provisioning_status to be ACTIVE.
neutron lbaas-listener-create --loadbalancer lb1 --protocol HTTP --protocol-port 80 --name listener1
sleep 10  # Sleep since LBaaS actions can take a few seconds depending on the environment.
neutron lbaas-pool-create --lb-algorithm ROUND_ROBIN --listener listener1 --protocol HTTP --name pool1
sleep 10
neutron lbaas-member-create  --subnet private-subnet --address 10.0.0.3 --protocol-port 80 pool1
sleep 10
neutron lbaas-member-create  --subnet private-subnet --address 10.0.0.5 --protocol-port 80 pool1

Please note here that the "10.0.0.3" and "10.0.0.5" in the above commands are the IPs of the nodes (in my test run-thru, they were actually 10.2 and 10.4), and the address of the created LB will be reported as "vip_address" from the lbaas-loadbalancer-create, and a quick test of that LB is "curl that-lb-ip", which should alternate between showing the IPs of the two nodes.