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AWS High Availability & Fault Tolerance Architecture
WEBAmazon Web Services provides services and infrastructure to build reliable, fault-tolerant, and highly available systems in the cloud. Fault-tolerance defines the ability for a system to remain in operation even if some of the components used to build the system fail. Most of the higher-level services, such as S3, SimpleDB, SQS, and ELB, …
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URL: https://jayendrapatil.com/aws-high-availability-fault-tolerance-architecture-certification/
AWS Auto Scaling & ELB
WEBAuto Scaling marks the instance as unhealthy and replaces the instance if the instance fails the EC2 instance status check. ELB also performs health checks on the EC2 instances that are registered with it for e.g. the application is available by pinging a health check page; ELB health check with the instances should be used to ensure that traffic is …
AWS Elastic Load Balancer
WEBAWS Elastic Load Balancer – ELB. Elastic Load Balancer allows the incoming traffic to be distributed automatically across multiple healthy EC2 instances. ELB serves as a single point of contact for the client. ELB helps to be transparent and increases the application availability by allowing the addition or removal of multiple EC2 instances
AWS Auto Scaling Policies
WEBDynamic Scaling. Allows automatic scaling in response to the changing demand for e.g. scale-out in case CPU utilization of the instance goes above 70% and scale in when the CPU utilization goes below 30%; ASG uses a combination of alarms & policies to determine when the conditions for scaling are met.. An alarm is an object that …
AWS Application Load Balancer
WEBA load balancer. serves as the single point of contact for clients. distributes incoming application traffic across multiple targets, such as EC2 instances, in multiple AZs, which increases the availability of the application. one or more listeners can be added to the load balancer. A listener.
AWS Auto Scaling Lifecycle
WEBInstances launched through the Auto Scaling group have a different lifecycle than that of other EC2 instances. Auto Scaling lifecycle starts when the Auto Scaling group launches an instance and puts it into service. Auto Scaling lifecycle ends when the instance is terminated either by the user, or the Auto Scaling group takes it out of service
AWS Elastic Beanstalk Deployment Strategies
WEBElastic Beanstalk environment uses all-at-once deployments if it is created with a different client (API, SDK, or AWS CLI). All at Once deployments perform an in-place deployment on all instances at the same time. All at Once deployments are simple and fast, however, it would lead to downtime and the rollback would take time in case of any issues.
AWS Global Accelerator
WEBAWS Global Accelerator is a networking service that helps improve the availability and performance of the applications to global users. AWS Global Accelerator optimizes the path to applications to keep packet loss, jitter, and latency consistently low. helps improve the performance of the applications by lowering first-byte latency (the …
AWS Elastic Beanstalk
WEBElastic Beanstalk with Other AWS Services. Elastic Beanstalk supports VPC and launches AWS resources, such as instances, into the VPC. Elastic Beanstalk supports IAM and helps you securely control access to your AWS resources. CloudFront can be used to distribute the content in S3 after an Elastic Beanstalk is created and deployed.
Google Cloud Compute Engine Instance Groups
WEBAn instance group is a collection of virtual machine (VM) instances that can be managed as a single entity. Compute Engine offers two kinds of VM instance groups. Managed instance groups (MIGs) allows app creation with multiple identical VMs. workloads can be made scalable and highly available by taking advantage of automated MIG …
AWS Disaster Recovery
WEBRecovery Time Objective (RTO) – The time it takes after a disruption to restore a business process to its service level, as defined by the operational level agreement (OLA) for e.g. if the RTO is 1 hour and disaster occurs @ 12:00 p.m (noon), then the DR process should restore the systems to an acceptable service level within an hour …
AWS Services Overview
WEBAWS CodeBuild. is a fully managed build service that compiles source code, runs tests, and produces software packages that are ready to deploy. also helps provision, manage, and scale the build servers. scales continuously and processes multiple builds concurrently, so the builds are not left waiting in a queue.
Google Cloud Load Balancing Types
WEBNetwork Load Balancer. SSL Proxy Load Balancer. Internal TCP/UDP Load Balancer. Add a firewall rule allowing ingress traffic from 0.0.0.0/0 on the target instances. Google Cloud Load Balancing provides various options varying from external vs internal, global vs regional, layer 4 vs 7 etc. and much more.
AWS Auto Scaling
WEBAs the scaling activity is happening quite frequently, the reasons would either be that the alarms configured are causing the auto scaling to scale up and down fast or the cool down timers are small due to which the auto scaling activity is triggered before the new instance gets a chance to handle traffic. Option B is wrong as terminating oldest instance would …
AWS Classic Load Balancer vs Application Load Balancer vs …
WEBElastic Load Balancing supports three types of load balancers: Classic Load Balancer – CLB. Application Load Balancer – ALB. Network Load Balancer – NLB. While there is some overlap in the features, AWS does not maintain feature parity between the different types of load balancers.
AWS Certified DevOps Engineer – Professional (DOP-C01) Exam …
WEBNOTE – Refer to DOP-C02 Learning Path. AWS Certified DevOps Engineer – Professional (DOP-C01) exam is the upgraded pattern of the DevOps Engineer – Professional exam which was released last year (2018). I recently attempted the latest pattern and AWS has done quite good in improving it further, as compared to the old …
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