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Add a couple of AWS questions and exercises

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EBS & ELB mainly.
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abregman
2021-11-20 22:59:23 +02:00
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@ -10,7 +10,7 @@
:busts_in_silhouette:  Join our [DevOps community](https://www.facebook.com/groups/538897960007080) where we have discussions and share resources on DevOps
:pencil:  You can add more questions and exercises by submitting pull requests :) Read about contribution guidelines [here](CONTRIBUTING.md)
:pencil:  You can add more exercises by submitting pull requests :) Read about contribution guidelines [here](CONTRIBUTING.md)
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@ -7605,7 +7605,7 @@ A load balancer accepts (or denies) incoming network traffic from a client, and
</b></details>
<details>
<summary>What benefits load balancers provide?</summary><br><b>
<summary>Why to used a load balancer?</summary><br><b>
* Scalability - using a load balancer, you can possibly add more servers in the backend to handle more requests/traffic from the clients, as opposed to using one server.
* Redundancy - if one server in the backend dies, the load balancer will keep forwarding the traffic/requests to the second server so users won't even notice one of the servers in the backend is down.
@ -8276,6 +8276,12 @@ With vertical scaling alone, the component still remains a single point of failu
In addition, it has hardware limit where if you don't have more resources, you might not be able to scale vertically.
</b></details>
<details>
<summary>Which type of cloud services usually support vertical scaling?</summary><br><b>
Databases, cache. It's common mostly for non-distributed systems.
</b></details>
<details>
<summary>Explain Horizontal Scaling</summary><br><b>
@ -8283,7 +8289,7 @@ Horizontal Scaling is the process of adding more resources that will be able han
</b></details>
<details>
<summary>What is the disadvange of Horizontal Scaling? What is often required in order to perform Horizontal Scaling?</summary><br><b>
<summary>What is the disadvantage of Horizontal Scaling? What is often required in order to perform Horizontal Scaling?</summary><br><b>
A load balancer. You can add more resources, but if you would like them to be part of the process, you have to serve them the requests/responses.
Also, data inconsistency is a concern with horizontal scaling.