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Richard Birkby 2016-10-13 08:04:31 +01:00
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@ -1167,11 +1167,11 @@ CloudFront
- 📒 [Homepage](https://aws.amazon.com/cloudfront/) ∙ [Developer guide](http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/) ∙ [FAQ](https://aws.amazon.com/cloudfront/faqs/) ∙ [Pricing](https://aws.amazon.com/cloudfront/pricing/)
- **CloudFront** is AWS’ [content delivery network (CDN)](https://en.wikipedia.org/wiki/Content_delivery_network).
- Its primary use is improving latency for end users in to accessing cacheable content by hosting it at [over 60 global edge locations](http://aws.amazon.com/cloudfront/details/).
- Its primary use is improving latency for end users through accessing cacheable content by hosting it at [over 60 global edge locations](http://aws.amazon.com/cloudfront/details/).
### CloudFront Alternatives and Lock-in
- 🚪CDNs are [a highly fragmented market](https://www.datanyze.com/market-share/cdn/). CloudFront has grown to be a leader, but many alternatives that might better suit specific needs.
- 🚪CDNs are [a highly fragmented market](https://www.datanyze.com/market-share/cdn/). CloudFront has grown to be a leader, but there are many alternatives that might better suit specific needs.
### CloudFront Tips
- 🐥**IPv6** is [now supported](https://aws.amazon.com/about-aws/whats-new/2016/10/ipv6-support-for-cloudfront-waf-and-s3-transfer-acceleration/)!
@ -1253,7 +1253,7 @@ EMR
### EMR Alternatives and Lock-in
- ⛓Most of EMR is based open source technology that you can in principle deploy yourself. However, the job workflows and much other tooling is AWS-specific. Migrating from EMR to your own clusters is possible but not always trivial.
- ⛓Most of EMR is based on open source technology that you can in principle deploy yourself. However, the job workflows and much other tooling is AWS-specific. Migrating from EMR to your own clusters is possible but not always trivial.
### EMR Tips
@ -1277,7 +1277,7 @@ This section covers tips and information on achieving [high availability](https:
- AWS offers two levels of redundancy, [regions and availability zones (AZs)](http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-regions-availability-zones.html#concepts-regions-availability-zones).
- When used correctly, regions and zones do allow for high availability. You may want to use non-AWS providers for larger business risk mitigation (i.e. not tying your company to one vendor), but reliability of AWS across regions is very high.
- **Multiple regions:** Using multiple regions is complex, since it’s essentially like completely separate infrastructure. It is necessary for business-critical services which highest levels of redundancy. However, for many applications (like your average consumer startup), deploying extensive redundancy across regions may be overkill.
- **Multiple regions:** Using multiple regions is complex, since it’s essentially like completely separate infrastructure. It is necessary for business-critical services with the highest levels of redundancy. However, for many applications (like your average consumer startup), deploying extensive redundancy across regions may be overkill.
- The [High Scalability Blog](http://highscalability.com/blog/2016/1/11/a-beginners-guide-to-scaling-to-11-million-users-on-amazons.html) has a good guide to help you understand when you need to scale an application to multiple regions.
- 🔹**Multiple AZs:** Using AZs wisely is the primary tool for high availability!
- A typical single-region high availability architecture would be to deploy in two or more availability zones, with load balancing in front, as in [this AWS diagram](http://media.amazonwebservices.com/architecturecenter/AWS_ac_ra_ftha_04.pdf).