![]() ![]() Recovery Time Objective (RTO) is the maximum acceptable delay between the interruption of service and restoration of service.AWS Network Load Balancer (NLB) supports only port-based routing since NLB operates at Layer-4 - Transport of OSI model.AWS Application Load Balancer (ALB) supports path-based and host-based routing, since concepts of URL, Paths, and DNS Hostnames are only defined for Layer 7 - Application of the OSI model. ![]() By default, AWS EC2 user data scripts and cloud-init directives run only during the first boot cycle when an EC2 instance is launched.AWS EC2 user data is limited to 16KB in raw form before it is base64-encoded.To retrieve user data from within a running EC2 instance, use the following URI.In order for a public subnet in a VPC to access the Internet, ensure a 0.0.0.0/0 destination route in the VPC route table has an Internet Gateway target.AWS CloudWatch and Amazon SNS services can be used to notify by email when certain CloudWatch metrics thresholds exceed.AWS RDS Multi-AZ with read-replicas uses asynchronous replication and can use used to offload read traffic to increase application read throughput.AWS RDS Multi-AZ deployment automatically provisions and maintains synchronous standby replica in a different Availability Zone.AWS RDS Multi-AZ primary to standby DB instance failover times is typically 60–120 seconds or within 5 minutes in case of a large transaction or lengthy recovery process.Multi-AZ DB cluster deployment has two standby DB instances, provides failover support, and can also serve read traffic to increase application read throughput. MultiAZ DB instance deployment has one standby DB instance, it only provides failover support but doesn’t serve read traffic. AWS RDS Multi-AZ deployment can have one standby or two standby DB instances. ![]()
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