Aws Disaster Recovery Hosting

Aws Disaster Recovery Hosting – Amazon Web Services (AWS) is a better choice for organizations looking to reduce technology costs by moving computing resources on-premises and hosted in the cloud. The main benefit is that AWS requires a lower total cost of ownership (TCO) than self-hosted and collocated data centers, especially when considering servers, network infrastructure, hardware, software, operating system, power costs, cooling costs and more. of other components. AWS’s low TCO not only makes it an excellent choice for any organization looking to reduce its capital and operational expenses, but it also serves as an invaluable disaster recovery (DR) platform.

Disaster recovery is the critical operational and business continuity component that addresses an organization’s technical infrastructure and ability to survive an outage. Regardless of the cause, a business disaster is any event that causes data loss, limits the ability to meet customer demands, or disrupts revenue. The goal of disaster recovery is to save the technical and operational resources needed to run a business after man-made or natural disasters, with minimal manual intervention or non-standard processes.

Aws Disaster Recovery Hosting

Aws Disaster Recovery Hosting

From a business goals perspective, we explore common trade-offs in terms of downtime, longevity of data loss, and the cost of a disaster recovery solution. In other words, as the RTO or RPO decreases, the disaster recovery solution usually becomes more expensive.

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Disasters are usually classified as natural or man-made. Man-made disasters are generally limited to a smaller geographic area than natural disasters (the 1986 Chernobyl disaster was a notable exception). Natural disasters include floods, typhoons and earthquakes and affect large areas.

AWS is designed around the idea of ​​Regions and Availability Zones. Regions are separate and completely independent geographic areas where AWS provides hosting services. Each Region has two or more Availability Zones for fault tolerance. Availability Zones are located within the same region, but in different locations (for example, floodplains, fault zones) to withstand natural and man-made disasters. Availability Zones are interconnected within a region and provide cross-regional communication capabilities.

Because of the variability in RTO and RPO requirements, there are different disaster recovery strategies used across the enterprise. Referring to the diagram below, on the left are the solutions (Backup & Restore, Pilot Light) which tend to have high RTO and RPO and therefore lower costs. As you proceed to the right in the diagram (Warm Standby, Multi-Site), the RTO and RPO are lower, but the solution comes with a higher cost.

Disaster Recovery Setup

The preceding diagram identifies four general strategies for disaster recovery solutions and illustrates the relative cost of each extreme.

The backup and recovery strategy is a common DR standard that is usually inexpensive but comes with a high RPO and RTO. A canonical example is data backup to tape and tape archive archived for a certain period of time; these tapes are stored offsite in a facility specifically designed to hold digital archives.

AWS offers a variety of low-cost options to support this DR strategy. Typically, AWS Simple Storage Solution (S3) is used to store things in the cloud. S3 is a powerful and cost-effective storage solution with 11 9s stability (99.999999999% stable storage solution). In other words, on average something can be lost every 10 million years. As a complementary service, AWS Glacier offers low-cost storage of infrequently accessed data. S3 lifecycle operations can automatically archive data from an S3 bucket to AWS Glacier and enforce corporate disposition policies for compliance purposes.

Aws Disaster Recovery Hosting

In addition to direct Internet connection and AWS VPN to access S3 storage buckets, corporate data centers have many options. These include Direct Connect, AWS Storage Gateway and, for extremely large datasets, Snowball.

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A recent solution from AWS is the File Gateway solution. Like Storage Gateway, File Gateway is deployed on-premises as a virtual machine. File Gateway connects to the corporate data center via NFS. Corporate computing resources mount the NFS file system for storing and retrieving files. Archived files are replicated to AWS and stored in S3, where lifecycle policies govern file dispositions.

S3 buckets are region properties, which means that an S3 bucket is discovered and addressed by a particular AWS Region. To increase the stability and security of critical business data, S3 supports replication of data between buckets in different regions via cross-region replication. S3 buckets can be configured to automatically and asynchronously copy new objects into Regions. Some customers use cross-region replication to ensure data security across multiple regions.

As part of your backup and disaster recovery strategy, AWS offers many solutions, from directly connecting the Internet to an S3 bucket to using Snowball to move petabyte-scale amounts of information to the cloud.

The Pilot Light strategy calls for minimal disaster recovery while maintaining a small footprint around AWS so that business operations can begin on AWS in the event of a corporate data center failure.

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Metaphorically, the pilot flame prevents the use of a gas appliance (such as a water heater). When the water needs to be heated, the water heater uses a pilot light to ignite the furnace. Similarly, the base level of application capacity has doubled in the cloud. In the event of a disaster, the disaster recovery environment can be brought online using a small amount of information stored in the cloud. In this case, however, the information goes beyond traditional object or database storage mechanisms to also include snapshots of virtual images and similar application elements.

At a minimum, application data must be replicated to the AWS disaster recovery environment. Databases must be replicated or mirrored. Data can be replicated to EC2 instances or AWS database services, depending on the type of database used. In the former case, EC2 can be used for customer-managed database software. The customer manages the EC2 instance (fixes the operating system and database software) and configures replication between the data center and the cloud instance. If the customer uses AWS RDS, DynamoDB, or Redshift, AWS manages the database instance, while the customer sets up replication between the enterprise database and the AWS-based DR database.

However, many applications have application-specific logic and support software stacks that must also be replicated in the cloud-based DR environment. Keeping up-to-date application stacks on AWS helps you get your DR environment online faster than building application stacks from scratch.

Aws Disaster Recovery Hosting

There are two common approaches to building application stacks on AWS. The first is to create custom AWS images by building the application stack on the base image (AMI) available on the AWS Marketplace. Once the image is created, it can be referenced when starting the environment manually or through automation with CloudFormation templates. Note that these images need to be updated regularly with enterprise data center OS, patches, and application updates. Otherwise, the DR environment may not work as expected.

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The second method is to transfer the VMWare images directly to AWS. One way to do this is to create Elastic Block Store (EBS) images from VMFS artifacts. VMFS stores block images in VMWare images and snapshots. In combination with Storage Gateway, VMWare images and snapshots can be replicated to AWS DR. These images and snapshots can be stored as EBS File System Snapshots and from there EC2 images can be created from the EBS artifacts.

If the DR environment is required, the images can be changed and the environment is ready to take on the role of an enterprise data center. The Domain Name Service (DNS) can be assigned manually or automatically to the DR environment. Horizontal scaling can be achieved by using Elastic Load Balancers and Auto Scaling Groups to properly scale your fleet to meet demand. The database may require vertical scaling to handle the load of the product placed on it.

Finally, the AWS-based disaster recovery environment should be hosted in a different geographic region from the corporate data center. Cross-regional deployment in a disaster recovery environment is a best practice.

The Warm Standby strategy takes the Pilot Light strategy one step further and maintains a fully functional environment in the DR environment. However, full functionality does not mean that the DR environment is large enough to handle production-level traffic. Since the DR environment is fully functional, it is often used as a QA, testing or training environment in the organization.

Cloud Disaster Recovery On Aws

The hot standby strategy is conceptually outlined in the following diagram. The production environment is hosted in the corporate data center and DNS handles the production traffic in the data center. The DR environment, running on AWS, maintains a running environment that matches production in terms of application software versions and patches. However, the DR environment is not designed to handle production level traffic.

If a disaster recovery environment is needed to handle production-level traffic, DNS can be moved to the DR environment. Before taking traffic to production level, the environment needs to be scaled. The database must be scaled up using larger EC2 instance types for this to be correct

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