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23 Cards in this Set
- Front
- Back
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What is a push model in AWS? |
Using ELB to distribute traffic
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What 3 implementations are there for this push model? |
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What is application load balancing? |
When you take parameters based on the HTTP or layer 7 headers |
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What is network load balancing? |
When you take parameters based on the IP or layer 4 headers |
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Why are these 2 approaches better than Route 53? |
Because you can't control the DNS resolvers outside of AWS, and might get stale data/try to hit a now unavailable host |
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When might I instead use a pull model? |
For events and messaging coming from queues and streams |
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To keep an app stateless, what approach would we use with cookies? |
Keep only a session id in the cookie and look everything up on the server. |
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Why you want to avoid user session data being stored on a server's local file system? |
Because then you're stuck with using the same server for every request in that session. |
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How can we avoid this problem? What specific AWS technology might we use? |
Set the storage to be in a database so any server can always fetch the latest state. Dynamo DB might be a good fit as it's lightweight. |
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If I had to store a larger file than simply a session, e.g a user upload, what would be the best technology fit? |
S3
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If I had a file that was to be processed by the server, but not live forever, what might be a good choice for the storage strategy? |
Elastic File System - then it would be like a program would be dealing with its own local file system |
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If I had a wizard flow and needed to track the workflow state, what would I use then? |
AWS Step Functions |
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When might I use client side load balancing? |
When I might want to control who connects to which server (e.g. gamer groups) or when the server I'm connecting to does not support server side load balancing |
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What technologies are there for offline batch jobs to be distributed? |
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What technologies are there for real time distributed processing? There are 2 parts to the answer |
Amazon Kinesis with Lambdas or EC2 listening on the other end |
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What is bootstrapping? |
A way of layering your specific setup over the top of a base resource. |
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What are 4 ways of boot strapping? |
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What is a golden image? |
A snapshot |
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What are serverless patterns? |
Where you focus on the automation of the deployment pipeline and AWS handles the scaling and availability |
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What is a cloudwatch alarm? |
An SNS message that is fired when a metric breaches a threshold |
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What might we do with these alarms? |
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What are cloudwatch events? |
System events that describe changes in AWS resources |
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How does queueing allow you to keep a system stable? |
It allows to stop less scalable components from being overwhelmed because they can take demand as they can handle it. |
