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