![]() The standby region has a compute instance for mounting the replicated file storage. The primary region includes two compute instances for the application tier. The internet gateway allows traffic between the public subnets in a VCN and the public internet. Infrastructure Load Balancing service provides automated traffic distribution from a single entry point to multiple servers in the back end. So, you can avoid exposing the more sensitive components of the topology without compromising access to them. The topology has a single, known entry point that you can monitor and audit regularly. It enables you to protect sensitive resources by placing them in private networks that can't be accessed directly from outside the cloud. The bastion host is provisioned typically in a demilitarized zone (DMZ). The bastion host is a compute instance that serves as a secure, controlled entry point to the topology from outside the cloud. In this reference architecture, all the resources in each region are attached to a single VCN. You can change the size of a subnet after creation. Each subnet consists of a contiguous range of addresses that don't overlap with the other subnets in the VCN. You can segment a VCN into subnets, which can be scoped to a region or to an availability domain. A VCN can have multiple non-overlapping CIDR blocks that you can change after you create the VCN. Like traditional data center networks, VCNs give you complete control over your network environment. ![]() Virtual cloud networks (VCN) and subnetsĪ VCN is a customizable, software-defined network that you set up in an Oracle Cloud.But to protect against failure within a fault domain, you can distribute the resources in each availability across the fault domains. The architecture diagram doesn't show fault domains. When you distribute resources across multiple fault domains, your applications can tolerate physical server failure, system maintenance, and power failures inside a fault domain. Each availability domain has three fault domains with independent power and hardware. But in regions that have multiple availability domains, you can distribute the resources in each region across the availability domains, for high availability.Ī fault domain is a grouping of hardware and infrastructure within an availability domain. The architecture diagram doesn't show availability domains. So, a failure at one availability domain is unlikely to affect the other availability domains in the region. Availability domains don’t share infrastructure such as power or cooling, or the internal availability domain network. The physical resources in each availability domain are isolated from the resources in the other availability domains, which provides fault tolerance. Regions are independent of other regions, and vast distances can separate them (across countries or even continents).Īvailability domains are standalone, independent data centers within a region. ![]() Infrastructure region is a localized geographic area that contains one or more data centers, called availability domains. The architecture has the following components: The following diagram illustrates this reference architecture.ĭescription of the illustration x-region-pilot-light-topology.png This architecture shows a multi-tier topology that has redundant resources distributed across two Oracle Cloud Infrastructure provides highly available and scalable infrastructure and services that enable you design a pilot-light DR topology. In the event of a disaster at the primary site, you can use the pilot-light components at the remote location to restore a production-scale environment quickly. In the context of DR, a pilot-light environment contains the core components of a given workload, with the latest configuration and critical data, running at a minimal scale at a location that's remote from the primary site. The term pilot light refers to a small flame that is always lit in devices such as gas-powered heaters, and can be used to start the devices quickly when required. A pilot-light topology offers a balance between cost and recovery requirements. Your business continuity plan should include a DR strategy that meets your recovery point, recovery time, and budget objectives. If a large-scale outage affects your production applications, you need the ability to restore the workloads quickly. ![]()
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