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Using CDN to improve performance
1.
Using CDN to
improve performance Gea-Suan Lin [email_address]
2.
如果有問題…
3.
請不要舉手,
4.
請直接打斷!
5.
亂發問才會亂爆八卦
6.
我不能回答的,
7.
有人可以回答。
8.
9.
不過因為投影片超過一百張
10.
所以請節制…
11.
Anyway…
12.
開始。
13.
從小網站開始…
14.
一台 Server
15.
一台 Web
一台 Database
16.
…
17.
不小心 把網站搞大了
18.
Tuning
19.
很多台 Web
20.
DNS Round Robin
21.
每一台 Web
都有 Public IP
22.
…
23.
前面架一台 Load
balancer
24.
兩個禮拜後…
25.
Load balancer
凌晨三點當掉
26.
總經理還沒睡
27.
把換燈管的叫起來
28.
換燈管的把我叫起來
29.
…
30.
買硬體的 Load
balancer
31.
出事就找人罰站
32.
繼續 Tuning
33.
用 Apache
提供 css ?
34.
一個 css
3KB 佔用一個 50MB 的 httpd…
35.
動態頁面 與 靜態檔案
分離
36.
靜態檔案
37.
獨立網域
38.
static.bubble.com
39.
nginx 或
lighttpd
40.
為什麼用 nginx
?
41.
CSS/JavaScript + gzip
on-the-fly
42.
一台 nginx
43.
兩台 nginx
( 兩份檔案 )
44.
出事了…
45.
客服殺人…
46.
IE6 + gzip
地雷
47.
IE6 時
gzip 關掉
48.
繼續成長…
49.
N 台
nginx (N 份檔案 )
50.
…
51.
政治不正確
52.
Reverse Proxy Cache
53.
Squid
54.
Invalidate 問題
55.
/main.css
56.
/main.css?v=[ 修改時間 ]
57.
/main.css?v=[ CRC32 ]
58.
講到這裡,有沒有問題?
59.
網站繼續大下去…
60.
「拓展海外市場」
61.
需要改善非台灣的瀏覽速度
62.
光速是固定的
63.
台北 – 美西
120+ms
64.
台北 – 美東
180+ms
65.
在美國放伺服器
66.
用 GeoDNS
分配流量
67.
寫 Health
Check 當國外當掉時改用台灣的伺服器
68.
ZzZz…
69.
除了美洲還有歐洲
70.
自己管理的成本過高
71.
外包給專業的…
72.
CDN
73.
( 終於進入主題了 )
74.
Content Delivery Network
75.
內容傳遞網路
76.
( 屁 )
77.
等於沒解釋…
78.
多個伺服器群
79.
多個地點
80.
提供相同的內容
81.
所以…
82.
83.
加快 TCP
handshake 速度
84.
加快 TCP
下載速度
85.
2. 提供高可靠度
86.
不同地點互相備援
87.
3. DoS
防禦
88.
「由專業公司防禦 DoS
」
89.
「死道友不死貧道」
90.
4. 成本
91.
CDN 頻寬比較貴?
92.
台灣頻寬比 CDN
貴!
93.
一般頻寬計算方法: 95%
94.
五分鐘取樣一次
95.
一個月 30
天共 8640 次
96.
刪除最高的 5%
(432 次 )
97.
取剩下最高的
98.
From http://en.wikipedia.org/wiki/Burstable_billing
99.
CDN 頻寬計算方式:總量
100.
總量 =
平均流量 ( 等價 )
101.
1Mbps ~ 10GB/day
102.
換算?
103.
依照網站的 MRTG
Pattern
104.
From http://en.wikipedia.org/wiki/Burstable_billing
105.
95% 2.62M
與平均 1.27M
106.
大約 2.06
倍
107.
5. 克服瀏覽器壓縮
bug
108.
用 CDN
後總量反而下降
109.
講到這裡,有沒有問題?
110.
CDN 的分類
111.
Latency 、 Thoughput
、 Cost
112.
CSS 、 JavaScript
113.
低 Latency
、初期 Thoughput 要高、 Cost 不是主要考量
114.
亞洲要有直接連線的 PoPs
115.
尤其是 HiNet
與 TANet
116.
影音
117.
Latency 不重要,
Thoughput 足夠就好, Cost 要低
118.
封包到美西再到香港
119.
所以…
120.
( 如果有時間的話 )
121.
總是要講一下實際案例?
122.
Akamai
123.
很大,非常大,第一大
124.
效能是最好的
125.
台灣唯一有 PoPs
的 CDN
126.
台灣有經銷商
127.
價錢…
128.
Limelight Networks
129.
第二大?
130.
YouTube 被
Google 買之前的 CDN
131.
有香港與日本的 PoPs
132.
但是都是導到美西 PoPs
133.
第二大不一定比其他的好
134.
CDNetworks
135.
第三大?
136.
二月買下 Panther
Express
137.
討論 Panther
Express
138.
有香港與日本的 PoPs
139.
HiNet 與
TANet 到香港都是 20+ms
140.
HiNet 調整
routing 時會自動跳到日本,約 30+ms
141.
PIXNET 的
CSS/JavaScript
142.
EdgeCast
143.
第 N
大 ( 不重要了 )
144.
有香港與日本的 PoPs
145.
會導到香港的 PoP
,但是會先到美西
146.
但是速度沒問題
147.
PIXNET 的影音
148.
Voxel
149.
就是一家 CDN
業者…
150.
價錢公佈在網站上
151.
沒有亞洲的 PoPs
152.
Amazon CloudFront
153.
Because it’s Amazon…
154.
Don’t waste your
time
155.
Amazon S3
應該找其他 CDN 搭配用
156.
SimpleCDN
157.
完全是拼價錢的 CDN
158.
目前沒有亞洲的 PoPs
159.
不吃 file.css?v=[
時間 ]
160.
就…
161.
實際案例
162.
( 如果還有時間的話 )
163.
download.microsoft.com
164.
Akamai + Limelight
165.
js.microsoft.com
166.
Akamai
167.
www.barackobama.com
168.
Panther Express (g2)
169.
US-only PoPs
170.
public.slideshare.net
171.
Panther Express (g1)
172.
US + EU
PoPs
173.
cdn.slideshare.net
174.
Panther Express (l1)
175.
價錢導向的 CDN
Level
176.
cdn1.badongo.com cdn2.badongo.com cdn3.badongo.com
cdn4.badongo.com
177.
Amazon CloudFront Akamai
EdgeCast ( 目前是這個 ) EdgeCast
178.
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