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Using CDN to improve performance Gea-Suan Lin [email_address]
如果有問題…
請不要舉手,
請直接打斷!
亂發問才會亂爆八卦
我不能回答的,
有人可以回答。
 
不過因為投影片超過一百張
所以請節制…
Anyway…
開始。
從小網站開始…
一台  Server
一台  Web 一台  Database
…
不小心 把網站搞大了
Tuning
很多台  Web
DNS Round Robin
每一台  Web  都有  Public IP
…
前面架一台  Load balancer
兩個禮拜後…
Load balancer  凌晨三點當掉
總經理還沒睡
把換燈管的叫起來
換燈管的把我叫起來
…
買硬體的  Load balancer
出事就找人罰站
繼續  Tuning
用  Apache  提供  css ?
一個  css 3KB  佔用一個  50MB  的  httpd…
動態頁面 與 靜態檔案 分離
靜態檔案
獨立網域
static.bubble.com
nginx  或  lighttpd
為什麼用  nginx ?
CSS/JavaScript + gzip on-the-fly
一台  nginx
兩台  nginx ( 兩份檔案 )
出事了…
客服殺人…
IE6 + gzip  地雷
IE6  時  gzip  關掉
繼續成長…
N  台  nginx (N  份檔案 )
…
政治不正確
Reverse Proxy Cache
Squid
Invalidate  問題
/main.css
/main.css?v=[ 修改時間 ]
/main.css?v=[ CRC32 ]
講到這裡,有沒有問題?
網站繼續大下去…
「拓展海外市場」
需要改善非台灣的瀏覽速度
光速是固定的
台北 – 美西 120+ms
台北 – 美東 180+ms
在美國放伺服器
用  GeoDNS  分配流量
寫  Health Check  當國外當掉時改用台灣的伺服器
ZzZz…
除了美洲還有歐洲
自己管理的成本過高
外包給專業的…
CDN
( 終於進入主題了 )
Content Delivery Network
內容傳遞網路
( 屁 )
等於沒解釋…
多個伺服器群
多個地點
提供相同的內容
所以…
[object Object]
加快  TCP handshake  速度
加快  TCP  下載速度
2.  提供高可靠度
不同地點互相備援
3. DoS  防禦
「由專業公司防禦  DoS 」
「死道友不死貧道」
4.  成本
CDN  頻寬比較貴?
台灣頻寬比  CDN  貴!
一般頻寬計算方法: 95%
五分鐘取樣一次
一個月  30  天共  8640  次
刪除最高的  5% (432  次 )
取剩下最高的
From http://en.wikipedia.org/wiki/Burstable_billing
CDN  頻寬計算方式:總量
總量  =  平均流量  ( 等價 )
1Mbps ~ 10GB/day
換算?
依照網站的  MRTG Pattern
From http://en.wikipedia.org/wiki/Burstable_billing
95% 2.62M  與平均  1.27M
大約  2.06  倍
5.  克服瀏覽器壓縮  bug
用  CDN  後總量反而下降
講到這裡,有沒有問題?
CDN  的分類
Latency 、 Thoughput 、 Cost
CSS 、 JavaScript
低  Latency 、初期  Thoughput  要高、 Cost  不是主要考量
亞洲要有直接連線的  PoPs
尤其是  HiNet  與  TANet
影音
Latency  不重要, Thoughput  足夠就好, Cost  要低
封包到美西再到香港
所以…
( 如果有時間的話 )
總是要講一下實際案例?
Akamai
很大,非常大,第一大
效能是最好的
台灣唯一有  PoPs  的  CDN
台灣有經銷商
價錢…
Limelight Networks
第二大?
YouTube  被  Google  買之前的  CDN
有香港與日本的  PoPs
但是都是導到美西  PoPs
第二大不一定比其他的好
CDNetworks
第三大?
二月買下  Panther Express
討論  Panther Express
有香港與日本的  PoPs
HiNet  與  TANet  到香港都是  20+ms
HiNet  調整  routing  時會自動跳到日本,約  30+ms
PIXNET  的  CSS/JavaScript
EdgeCast
第  N  大  ( 不重要了 )
有香港與日本的  PoPs
會導到香港的  PoP ,但是會先到美西
但是速度沒問題
PIXNET  的影音
Voxel
就是一家  CDN  業者…
價錢公佈在網站上
沒有亞洲的  PoPs
Amazon CloudFront
Because it’s Amazon…
Don’t waste your time
Amazon S3  應該找其他  CDN  搭配用
SimpleCDN
完全是拼價錢的  CDN
目前沒有亞洲的  PoPs
不吃  file.css?v=[ 時間 ]
就…
實際案例
( 如果還有時間的話 )
download.microsoft.com
Akamai + Limelight
js.microsoft.com
Akamai
www.barackobama.com
Panther Express (g2)
US-only PoPs
public.slideshare.net
Panther Express (g1)
US + EU PoPs
cdn.slideshare.net
Panther Express (l1)
價錢導向的  CDN Level
cdn1.badongo.com cdn2.badongo.com cdn3.badongo.com cdn4.badongo.com
Amazon CloudFront Akamai EdgeCast ( 目前是這個 ) EdgeCast
Thanks

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Using CDN to improve performance