- Distributing Load and Volume with Auto-Scaling and Load Balancing
- Enabling Automatic Failovers for High Availability
- Facilitating Controlled Deployments with Rollback Strategies
- Providing Chaos Engineering Capabilities for Resilience Testing
- Assisting in Incident Response with Automation
- Ensuring Proper Configuration Management
- Leveraging Immutable Infrastructure as a Service
- Practicing Disaster Recovery Frequently
- Case Study
- Summary
- Q&A
This chapter is from the book
This chapter is from the book
This chapter is from the book
Enabling Automatic Failovers for High Availability
Enabling automatic failovers for high availability is a critical aspect of cloud infrastructure design. It ensures that your applications and services remain accessible and operational, even in the face of hardware failures, network issues, or other unexpected events. The following services play a vital role in enabling automatic failovers for high availability in your cloud-based applications. Depending on your specific use cases and requirements, you can leverage one or more of these tools to design a resilient and fault-tolerant infrastructure that ensures continuous availability and minimal downtime for your applications and services.
AWS
AWS provides several tools and services that enable automatic failovers to achieve high availability.
Amazon Route 53 DNS Failover: Route 53 DNS Failover is AWS’s scalable DNS web service. It offers DNS failover capabilities, allowing you to automatically reroute traffic from an unhealthy or unavailable resource to a healthy one based on health checks. In essence, you can use Route 53 DNS Failover to ensure high availability of your web applications, websites, and services by directing traffic to healthy endpoints in the event of failures.
Amazon Relational Database Service (RDS): RDS is a managed database service that offers multi-AZ deployments for database instances. Multi-AZ provides high availability by replicating your primary database to a standby instance in a different Availability Zone (AZ). By using multi-AZ, you can ensure that your database remains available with automatic failover in the event of a database instance failure or planned maintenance.
Amazon RDS Aurora: RDS Aurora is a highly available and scalable relational database service. Aurora Multi-Master allows you to create multiple read/write master database instances for high availability and read scalability. Aurora Multi-Master is suitable for applications that require both high availability and the ability to distribute write workloads across multiple database instances.
Amazon DynamoDB: DynamoDB is a managed NoSQL database service. DynamoDB global tables enable you to create multiregion, multi-active databases to provide high availability and low-latency access to your data. Global tables are ideal for global applications that need to maintain high availability across multiple geographic regions.
AWS Global Accelerator: Global Accelerator is a network service that provides high availability and fault tolerance for applications deployed across multiple AWS regions. Global Accelerator helps route traffic to healthy endpoints in the event of failures or performance degradation, improving the availability and responsiveness of your application.
Amazon Simple Storage Service (S3): S3 offers data replication options, including cross-region replication (CRR) and same-region replication (SRR). These options enable data replication for high availability and data durability. S3 replication is crucial for ensuring that your data remains accessible and intact, even in the face of region-specific failures or disasters.
GCP
GCP provides the following tools that enable automatic failovers to achieve high availability.
Google Cloud Load Balancing: Google Cloud Load Balancing provides built-in failover capabilities to ensure high availability of your applications. It continuously monitors the health of backend instances or services and automatically redirects traffic away from failed instances to healthy ones. This helps minimize downtime and ensures that your applications remain accessible, even in the event of failures.
Google Cloud DNS: Google Cloud DNS offers automatic failover functionality for DNS records. You can configure DNS failover policies to monitor the availability of your backend services and automatically update DNS records to redirect traffic to alternative IP addresses or endpoints in case of failures. This helps ensure seamless failover and continuous availability of your applications.
Microsoft Azure
Microsoft Azure provides the following tools that enable automatic failovers to achieve high availability.
Azure Traffic Manager: Azure Traffic Manager provides automatic failover capabilities for distributing traffic across multiple endpoints located in different Azure regions or globally. It continuously monitors the health of endpoints and automatically redirects traffic away from failed endpoints to healthy ones. This helps ensure high availability and reliability of your applications by minimizing downtime and maintaining continuous access for users.
Azure App Service: Azure App Service offers built-in auto-healing capabilities for web applications hosted on the platform. It automatically detects and resolves common application issues, such as crashes or unresponsiveness, by recycling or restarting the affected instances. This helps minimize downtime and ensures that your web applications remain available and responsive to users.
