NashTech Insights

Achieving High Availability with Ansible: Load Balancers and Failover

Rahul Miglani
Rahul Miglani
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Introduction: In today’s fast-paced digital world, ensuring high availability of applications and services is crucial for businesses to meet customer demands and maintain uninterrupted operations. Ansible, a powerful automation tool, can play a pivotal role in achieving high availability by efficiently managing load balancers and implementing failover mechanisms. In this blog, we’ll explore how to use Ansible to set up load balancers and configure failover to achieve robust high availability for your infrastructure.

Load Balancers with Ansible

Load balancers distribute incoming network traffic across multiple backend servers, ensuring optimal resource utilization and improved performance. Ansible’s flexibility and ease of use make it an ideal choice for configuring load balancers.

Here’s a simplified Ansible playbook example to set up a load balancer using Nginx:

In this playbook, we install Nginx on the designated load balancer servers and replace the default configuration with a custom template (nginx_config.j2) that defines the load balancing rules.

Failover Implementation with Ansible

Failover is a critical aspect of high availability, ensuring continuous service availability in the event of a server or component failure. Ansible can help automate failover processes, making the infrastructure more resilient.

Let’s consider an example of implementing failover for a web server cluster using Ansible:

Finally, In this playbook, we define the primary and backup server IP addresses as variables. The playbook checks the status of the primary server and, in case of failure, executes a script to promote the backup server and updates the DNS records to redirect traffic to the backup server.


Lastly, High availability is a critical requirement for modern IT infrastructures, and Ansible provides a reliable and efficient way to achieve it. By automating load balancer configurations and implementing failover mechanisms, Ansible enables seamless management of resources and ensures uninterrupted service delivery.

Finally, Remember that this blog showcases simplified Ansible playbook examples. In real-world scenarios, additional configurations and considerations might be necessary to achieve high availability. Always tailor the solution to your specific infrastructure needs and security requirements.

Lastly, Happy automating with Ansible!

Rahul Miglani

Rahul Miglani

Rahul Miglani is Vice President at NashTech and Heads the DevOps Competency and also Heads the Cloud Engineering Practice. He is a DevOps evangelist with a keen focus to build deep relationships with senior technical individuals as well as pre-sales from customers all over the globe to enable them to be DevOps and cloud advocates and help them achieve their automation journey. He also acts as a technical liaison between customers, service engineering teams, and the DevOps community as a whole. Rahul works with customers with the goal of making them solid references on the Cloud container services platforms and also participates as a thought leader in the docker, Kubernetes, container, cloud, and DevOps community. His proficiency includes rich experience in highly optimized, highly available architectural decision-making with an inclination towards logging, monitoring, security, governance, and visualization.

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