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Use cheapest EC2 instance as default (#14536)

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* Update docs

* Update docs
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docs/cloud-amazon-ec2.md
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@ -6,12 +6,18 @@ Creating an Amazon AWS account requires giving Amazon a phone number that can re
### Select an EC2 plan
The cheapest EC2 plan you can choose is the "Free Plan" a.k.a. the "AWS Free Tier." It is only available to new AWS customers, it has limits on usage, and it converts to standard pricing after 12 months (the "introductory period"). After you exceed the usage limits, after the 12 month period, or if you are an existing AWS customer, then you will pay standard pay-as-you-go service prices.
The cheapest EC2 plan you can choose is the "Free Plan" a.k.a. the ["AWS Free Tier"](https://aws.amazon.com/free/). It is only available to new AWS customers, it has limits on usage, and it converts to standard pricing after 12 months (the "introductory period"). After you exceed the usage limits, after the 12 month period, or if you are an existing AWS customer, then you will pay standard pay-as-you-go service prices.
*Note*: Your Algo instance will not stop working when you hit the bandwidth limit, you will just start accumulating service charges on your AWS account.
As of the time of this writing (July 2018), the Free Tier limits include "750 hours of Amazon EC2 Linux t2.micro instance usage" per month, 15 GB of bandwidth (outbound) per month, and 30 GB of cloud storage. Algo will not even use 1% of the storage limit, but you may have to monitor your bandwidth usage or keep an eye out for the email from Amazon when you are about to exceed the Free Tier limits.
If you are not eligible for the free tier plan or have passed the 12 months of the introductory period, you can switch to [AWS Graviton](https://aws.amazon.com/ec2/graviton/) instances that are generally cheaper. To use the graviton instances, make the following changes in the ec2 section of your `config.cfg` file:
* Set the `size` to `t4g.nano`
* Set the `arch` to `arm64`
> Currently, among all the instance sizes available on AWS, the t4g.nano instance is the least expensive option that does not require any promotional offers. However, AWS is currently running a promotion that provides a free trial of the `t4g.small` instance until December 31, 2023, which is available to all customers. For more information about this promotion, please refer to the [documentation](https://aws.amazon.com/ec2/faqs/#t4g-instances).
Additional configurations are documented in the [EC2 section of the deploy from ansible guide](https://github.com/trailofbits/algo/blob/master/docs/deploy-from-ansible.md#amazon-ec2)
### Create an AWS permissions policy
@ -81,11 +87,11 @@ Next you will be asked for the AWS Access Key (Access Key ID) and AWS Secret Key
Enter your aws_access_key (http://docs.aws.amazon.com/general/latest/gr/managing-aws-access-keys.html)
Note: Make sure to use an IAM user with an acceptable policy attached (see https://github.com/trailofbits/algo/blob/master/docs/deploy-from-ansible.md).
[pasted values will not be displayed]
[AKIA...]:
[AKIA...]:
Enter your aws_secret_key (http://docs.aws.amazon.com/general/latest/gr/managing-aws-access-keys.html)
[pasted values will not be displayed]
[ABCD...]:
[ABCD...]:
```
You will be prompted for the server name to enter. Feel free to leave this as the default ("algo") if you are not certain how this will affect your setup. Here we chose to call it "algovpn".
@ -116,7 +122,7 @@ What region should the server be located in?
14. us-east-2
15. us-west-1
16. us-west-2
Enter the number of your desired region
[13]
:

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