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Instagram 從 AWS 搬到 Facebook 機房

InstagramInstagram Engineering Blog 上宣佈的消息:「Migrating From AWS to FB」。

整個 migration 的過程是採取不停機轉移,所以 effort 比直接停機轉移高很多:

The main blocker to this easy migration was that Facebook’s private IP space conflicts with that of EC2. We had but one route: migrate to Amazon’s Virtual Private Cloud (VPC) first, followed by a subsequent migration to Facebook using Amazon Direct Connect. Amazon’s VPC offered the addressing flexibility necessary to avoid conflicts with Facebook’s private network.

先把整個系統轉移到 Amazon VPC 裡,然後再拉 AWS Direct Connect 串起來,接下來才是慢慢把 instance 轉移到 Facebook 的機房內。

中間也有一些工作:

To provide portability for our provisioning tools, all of the Instagram-specific software now runs inside of a Linux Container (LXC) on the servers in Facebook’s data centers.

所以已經導入 LXC 了...

Amazon Elastic Transcoder 與 Zencoder 的比較

在「Amazon Elastic Transcoder: Review」這邊比較了 Amazon Elastic TranscoderZencoder 兩個服務。

結論在一開頭就先提出來了:

For broadcasters and high-volume producers, Amazon's Elastic Transcoder has too many limitations. For everyone else, it's an appealing, if flawed, solution.

就轉出來的品質來說,作者認為沒什麼差異:

但就速度來說,Amazon Elastic Transcoder 的速度偏慢:

另外作者在文末也給了不少負面評價... 記錄起來以後應該用的到 :o

Amazon CloudFront 的新增功能

Amazon CloudFront 新增了 Whitelist Header 的功能:「Deliver Custom Content With CloudFront」。

如同在 post 裡說明的:

If you choose the Whitelist option, each header that you add to the list becomes part of the cache key for the URLs associated with the distribution.

有點像是 HTTP 協定裡 Vary 想要解決的問題,只是做在 CDN 這端。這個功能蠻多 CDN 都有,AWS 總算補上了...

這次除了可以針對 custom HTTP header 處理外,CloudFront 還做了不少事情:

  • Mobile Device Detection
  • Geo-Targeting
  • Multi-Site Hosting
  • Protocol Detection
  • CORS (Cross Origin Resource Sharing)

前兩項還蠻有意義的,這代表會有人幫你更新資料。而 CloudFront 總算是支援 CORS 了...

AWS 推出 SSD EBS

EBSAWS 上的 block-level storage,除了空間本身要收費以外,I/O 本身也要收費。到今天為止,EBS 只提供 Magnetic volume,也就是與傳統硬碟性質接近的 EBS。

而今天 AWS 推出了 SSD 的 EBS:「New SSD-Backed Elastic Block Storage」,價錢上當然就比傳統硬碟建立的 EBS 貴,但看起來是個可以接受的數字?

另外傳統硬碟的 Provisioned IOPS volume 也降價了,約 35% off:

We are also announcing that we are reducing the price of IOPS for Provisioned IOPS volumes by 35%.

需要效能的應用又多了一項武器...

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