"CSDN Online Training Q" How to build fault-tolerant app with cloud Platform

August 13, Amazon AWS China Cloud solution architect Wang Yi, in the online training theme "How to build fault-tolerant apps with cloud platforms", tells us how to make the most of the features of the cloud platform in the system architecture. Learn how to do architecture design techniques and related information in a cloud platform such as AWS.

To help us better review the relevant content of this training, learn how to design the cloud platform such as AWS skills and related information. CSDN organized the final QA for this training, as follows:

Q1. I would like to ask in the zoning mechanism, if the application request distance to a zone in physical distance, response time is also the fastest, in the case of load is not heavy, that elastic load balancing should not be sent across the region will request to B district? Unless the area A is down or overloaded, make sure the request is close to the nearest handle.

: Because each AZ is connected by a high-speed network, there is no problem nearby.

Q2. Which AZ is the ELB deployed in? What are the Elb fault-tolerant mechanisms?

: Elb is deployed across AZ, AWS guarantees Elb SLAs, and users need not worry about fault-tolerant mechanisms.

Q3. When Elb send requests to multiple webserver, how do you guarantee the uniqueness of webserver response?

Answer: ELB support session sticky guarantee the uniqueness of the answer.

Q4. Auto scaling can be a good understanding of automatic expansion, if the automatic contraction, the basis for how to shrink? What if the server being contracted is being used by a client for a program process that is simply broken and retracted? How does auto scaling automatically expand and requires script settings? How to implement automatic extension of application automation configuration, details? How long does automatic expansion take effect?

: Auto Scaling can set the conditions for shrinkage, meet the shrinkage conditions, reduce the number of servers. Auto scaling supports drain functions, ensuring that machines with customers online will not be stopped. Auto scaling can be configured via an interface or command line. The configuration will take effect immediately.

Q5. Master/From database synchronization, with what technology, synchronization frequency how to decide? Does the synchronization process create pressure on the primary database?

: Real-time synchronization does not create pressure on the primary database.

Q6. Is the Auto scaling the same as the single instance price?

Answer: Auto scaling itself does not charge, only charge EC2 instance fees.

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(Finishing/Li Zebian/yuping)