external/og-aws
1
0
Fork 0
mirror of https://github.com/nickpoida/og-aws.git synced 2025-02-13 10:21:57 +00:00
Code Issues Releases Wiki Activity

Merge pull request #267 from lynnlangit/patch-5

Browse source 
Added info about EC2 Reserved Instance Types
This commit is contained in:
Max Zanko 2016-10-30 12:38:54 -07:00 committed by GitHub
commit 656e0ffc41
1 changed files with 1 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
README.md
View file

@ -1657,6 +1657,7 @@ Billing and Cost Management
- ❗**Lifecycle management:** Do not attempt any fancy Spot management unless absolutely necessary. If your entire usage is only a few machines and your cost is acceptable and your failure rate is lower, do not attempt to optimize. The pain for building/maintaining it is not worth just a few hundred dollar savings.
- **Reserved Instances:** allow you to get significant discounts on EC2 compute hours in return for a commitment to pay for instance hours of a specific instance type in a specific AWS region and availability zone for a pre-established time frame (1 or 3 years). Further discounts can be realized through “partial” or “all upfront” payment options.
- Consider using Reserved Instances when you can predict your longer-term compute needs and need a stronger guarantee of compute availability and continuity than the (typically cheaper) Spot market can provide. However be aware that if your architecture changes your computing needs may change as well so long term contracts can seem attractive but may turn out to be cumbersome.
- There are two types of Reserved Instances - [Standard and Convertible](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/reserved-instances-types.html). If you purchase excess Standard Reserved Instances, you may offer to “sell back” unused Reserved Instances via the [Reserved Instance Marketplace](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ri-market-selling-guide.html), this allows you to potentially recoup the cost of unused EC2 compute instance hours by selling them to other AWS customers.
- Instance reservations are not tied to specific EC2 instances - they are applied at the billing level to eligible compute hours as they are consumed across all of the instances in an account.
- **Hourly billing waste:** EC2 instances are [billed in instance-hours](https://aws.amazon.com/ec2/faqs/#How_will_I_be_charged_and_billed_for_my_use_of_Amazon_EC2) — rounded up to the nearest full hour! For long-lived instances, this is not a big worry, but for large transient deployments, like EMR jobs or test deployments, this can be a significant expense. Never deploy many instances and terminate them after only a few minutes. In fact, if transient instances are part of your regular processing workflow, you should put in protections or alerts to check for this kind of waste.
- If you have multiple AWS accounts and have configured them to roll charges up to one account using the “Consolidated Billing” feature, you can expect *unused* Reserved Instance hours from one account to be applied to matching (region, availability zone, instance type) compute hours from another account.