Getting started with Load Balancer on Public Cloud (EN)

Last updated 2nd November 2022

Objective

Our new Load Balancer as a Service (LBaaS) solution is based on OpenStack Octavia and is fully integrated into the Public Cloud universe.

Learn how to configure an OVHcloud Load Balancer with the help of this guide.

Requirements

• A Public Cloud project in your OVHcloud account
• Using the OpenStack command line environment
• The OpenStack Command Line Interface tool installed on your working environment

Instructions

Configuring your private network

Before creating a Load Balancer, you will need to set up a private network:

openstack network create my_network

openstack subnet create my_subnet --subnet-range <my_private_ip_range/mask> --network my_network --no-dhcp

openstack router create my_router

openstack router add subnet my_router my_subnet

openstack router set --external-gateway Ext-Net my_router

You can now attach your instances to the new network. We recommend following our guide to integrate an instance into vRack. List the addresses of your instances in your network with the following command:

openstack server list

In the next step, configure the network interfaces of your instances according to this output.

Creating the Load Balancer

You can view a list of the different Load Balancer flavors we offer with this command:

openstack loadbalancer flavor list

You can now create your Load Balancer with the following command. In this example, we will create a "Small" Load Balancer.

openstack loadbalancer create --name my_load_balancer --flavor small --vip-subnet-id my_subnet

Your Load Balancer will be configured with an IP address of the private network. If you want to have access from the internet, you will need to attach a Floating IP address.

Attaching a Floating IP address to a Load Balancer

This is how to attach a Floating IP address to a Load Balancer:

openstack floating ip create Ext-Net
openstack floating ip set --port <my_load_balancer_vip_port_id> <floating_ip>

Configuring your Load Balancer

In this example we will configure an HTTP Load Balancer. In order to listen on port 80 of the Load Balancer, create a Listener with this command:

openstack loadbalancer listener create --name my_listener_http --protocol HTTP --protocol-port 80 my_loadbalancer

Once the Listener has been created, you need to add each instance that can respond to external requests. To do this, you must create an Instance Pool:

openstack loadbalancer pool create --name my_pool_http --lb-algorithm ROUND_ROBIN --listener my_listener --protocol HTTP

Add your instances to the Instance Pool:

openstack loadbalancer member create --subnet-id my_subnet --address <private_ip_instance_1> --protocol-port 80 my_pool
openstack loadbalancer member create --subnet-id my_subnet --address <private_ip_instance_2> --protocol-port 80 my_pool

You can now access your Load Balancer via the Floating IP or private IP address from an instance in your private network.

Go further

Official documentation of OpenStack Octavia

Cookbook OpenStack Octavia

Join our community of users on https://community.ovh.com/en/.

Join our Discord to discuss with the OVHcloud team and other users.

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