Add post about new CDN rollout

Author: jdno

posts/inside-rust/2023-01-24-content-delivery-networks.md

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+---
+layout: post
+title: Diversifying our Content Delivery Networks
+author: Jan David Nose
+team: The Rust Infrastructure Team <https://www.rust-lang.org/governance/teams/infra>
+---
+
+Over the past few weeks, the [Infrastructure Team] has been working on a setting
+up a second [Content Delivery Network] for releases and crates.
+
+## What is changing
+
+Rust releases (`static.rust-lang.org`) and crates (`static.crates.io`) will be
+served through both [AWS CloudFront](https://aws.amazon.com/cloudfront/) and
+[Fastly](https://www.fastly.com).
+
+This is a transparent change to the infrastructure that doesn't require users or
+developers to take any action. We expect no downtime for Rust users as part of
+the migration.
+
+This also covers only the CDNs for releases (`static.rust-lang.org`) and
+crates.io (`static.crates.io`), no changes are planned for the rest of Rust's
+domains.
+
+## Timeline
+
+We are planning to start the rollout of the new CDN on Tuesday, January 24rd,
+with `static.crates.io`.
+
+The rollout will happen very gradually over a period of time. We will start to
+send a small percentage of traffic through [Fastly](https://www.fastly.com/),
+while observing the performance and reliability of the new network. As we gain
+confidence, we will slowly increase the amount of traffic.
+
+Once `static.crates.io` has been deployed, we will start working on
+`static.rust-lang.org`.
+
+## Report issues
+
+If something _does_ break, please let the [Infrastructure Team] know on
+[#t-infra on Zulip](https://rust-lang.zulipchat.com/#narrow/stream/t-infra).
+
+[content delivery network]: https://en.wikipedia.org/wiki/Content_delivery_network
+[infrastructure team]: https://www.rust-lang.org/governance/teams/infra