Creating a Pilot-Light Disaster Recovery Architecture in OCI

Imagine waking up one morning to find that your business applications are down completely.

The systems your company relies on are suddenly unavailable, leaving you scrambling to restore them.

How would you recover?

How quickly could you get back to business?

These are the very questions that every organization needs to ask itself when creating a disaster recovery (DR) plan.

The answer lies in a well-structured DR strategy that ensures your business operations don’t come to a standstill in the event of an unexpected outage.

One of the most effective ways to achieve this is by setting up a Pilot-Light Disaster Recovery Architecture in Oracle Cloud Infrastructure (OCI).

Let’s break this down and explore what pilot-light DR architecture is, how it works, and why it’s the go-to choice for businesses looking to stay resilient, even in the face of major disruptions.



What is a Pilot-Light DR Architecture?

First things first—what do we mean by pilot-light?

You might have heard the term in the context of gas-powered devices. A pilot light is a small, steady flame that’s always on. It doesn’t consume much fuel, but it can quickly fire up a larger device (like a heater) when needed.

Now, apply this idea to your business applications.

In the context of DR, a pilot-light environment refers to a minimal version of your business systems running at a remote location. It’s like having the core components of your workload—like essential configurations and important data—ready to go, even though they’re operating on a smaller scale.

When disaster strikes and the primary site is down, you can use these pre-configured resources to spin up a fully functional environment at a different location, bringing your business back online quickly.

This setup is designed to give businesses the perfect balance between cost and recovery speed. Instead of running an entire duplicate system (which can be expensive), the pilot-light approach runs only the critical components.

When needed, it allows businesses to scale up quickly, bringing a full-fledged environment back online in a matter of minutes.


The Components of a Pilot-Light DR Architecture in OCI

Setting up a Pilot-Light Disaster Recovery (DR) plan in Oracle Cloud Infrastructure (OCI) requires certain components to ensure everything is set up for a smooth failover process. Let’s take a look at the key elements that make up a pilot-light DR architecture:

  1. Regions: OCI offers different geographical regions. You’ll need to set up resources across at least two regions to ensure redundancy. If one region goes down, the other can take over.
  2. Availability Domains and Fault Domains: These are the building blocks of high availability in OCI. Availability domains are isolated locations within a region, and fault domains are physical data centers within those availability domains. Distributing your resources across different fault and availability domains ensures that a localized failure doesn’t take down your entire setup.
  3. Virtual Cloud Networks (VCN) & Subnets: These networks connect your various resources in OCI. Subnets help organize your cloud resources into specific security boundaries, ensuring that the right resources communicate securely with each other.
  4. Compute Instances: The heart of your workload. These virtual machines (VMs) are where your applications run. For pilot-light DR, you’ll only run the core, with minimal compute instances required to keep your application functional.
  5. Load Balancer: A load balancer is essential to ensure that traffic is directed to the right servers, even when failover occurs. It acts as the traffic director, sending users to the active region or server.
  6. Object Storage: This is where all your critical data resides. It’s highly available and durable, ensuring that your backups and data replication can happen seamlessly across regions.
  7. Block Volumes: OCI offers block volumes for storing data that requires frequent updates, like databases. These volumes can be replicated across regions to ensure that your data stays safe and can be restored quickly in case of an outage.
  8. Bastion Hosts: A bastion host is a server that acts as a gateway between your secure cloud environment and the outside world. It helps secure remote access to the infrastructure while ensuring the security of the network.
  9. NAT Gateway, Internet Gateway, and Service Gateway: These components handle different aspects of network connectivity, including private connections between your resources and internet access. Read more. . .







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