Now that the server is using lighttpd its become possible to implement traffic shaping, you can even do it per directory which is a nice touch.
$HTTP["url"] =~ “^/photos/” {
connection.kbytes-per-second = 128
}
This limits all urls that start with /photos/ to 128k per second. You can try it on a photo of Queensland Australia that I’ve just uploaded. If you look at the output from wget we can see it in action:
Resolving www.idontplaydarts.com… 80.68.93.53
Connecting to www.idontplaydarts.com|80.68.93.53|:80… connected.
HTTP request sent, awaiting response… 200 OK
Length: 13858463 (13M) [image/jpeg]
Saving to: `queensland.jpeg’100%[=============================>] 13,858,463 136K/s in 1m 46s
2009-05-27 15:44:02 (128 KB/s) – `queensland.jpeg’ saved [13858463/13858463]
And there we have it. Traffic shaping using lighttpd. There are some pitfalls – users can still open multiple connections to your URL using tools such as axel – instructions on installing and using axel on debian can be found on nixCraft
As you can see if we open 4 connections we get 4 times the throughput.
# axel -a -n 4 http://www.idontplaydarts.com/photos/panorama/queensland.jpeg
Initializing download: http://www.idontplaydarts.com/photos/panorama/queensland.jpeg
File size: 13858463 bytes
Opening output file queensland.jpeg.0
Starting downloadConnection 3 finished ]
Connection 2 finished ]
Connection 0 finished ]
Connection 1 finished ]
[100%] [..................................................] [ 524.8KB/s] [00:00]Downloaded 13.2 megabytes in 25 seconds. (524.79 KB/s)
Lighttpd version 1.5 is going to support a max connections per ip which would be handy if you wanted to prevent people opening multiple connections. Not really that handy for a website but possibly if your serving lots of large static files.
Tags: Lighttpd, traffic shaping