liu-jianhao / Springsnail
《Linux 高性能服务器》附带的项目程序springsnil详细解读,一个负载均衡服务器
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springsnail
《Linux 高性能服务器》附带的项目程序详细解读
安装及使用
下载源码:
git clone https://github.com/liu-jianhao/springsnail.git
然后进入springsnil目录直接make
即可生成可执行文件
填写配置文件,我测试的是网站是网易云音乐,首先我先看看网易云音乐服务器的ip有哪几个:
$ nslookup music.163.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: music.163.com
Address: 103.65.41.125
Name: music.163.com
Address: 103.65.41.126
可以看出网易云音乐的网站有两个ip地址,我配置文件中的逻辑地址就用这两个地址
config.xml
:
Listen 127.0.0.1:8080
<logical_host>
<name>103.65.41.126</name>
<port>80</port>
<conns>2</conns>
</logical_host>
<logical_host>
<name>103.65.41.125</name>
<port>80</port>
<conns>2</conns>
</logical_host>
第一行是负载均衡服务器的地址,下面两个则是真正的服务器,spingsnil
只是起到一个中转站的作用,将客户端的连接转发给比较“闲”的服务器
接下来开始运行程序:
$ ./springsnail -f config.xml
[ 09/13/18 21:49:56 ] mgr.cpp:0050 info: logcial srv host info: (103.65.41.126, 80)
[ 09/13/18 21:49:56 ] mgr.cpp:0050 info: logcial srv host info: (103.65.41.125, 80)
[ 09/13/18 21:49:58 ] mgr.cpp:0062 info: build connection 0 to server success
[ 09/13/18 21:49:59 ] mgr.cpp:0062 info: build connection 0 to server success
[ 09/13/18 21:49:59 ] mgr.cpp:0062 info: build connection 1 to server success
[ 09/13/18 21:50:00 ] mgr.cpp:0062 info: build connection 1 to server success
没有出错服务器就已经在运行了,然后我尝试连接该负载均衡服务器:
$ nc localhost 8080
GET / HTTP/1.1
Host: music.163.com
HTTP/1.1 302 Found
Server: nginx
Date: Thu, 13 Sep 2018 13:52:34 GMT
Content-Length: 0
Connection: keep-alive
Cache-Control: no-store
Pragrma: no-cache
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Cache-Control: no-cache
Location: https://music.163.com/
X-Via: MusicEdgeServer
X-From-Src: 218.17.40.86
而另一端服务器则会有类似以下的输出:
[ 09/13/18 21:52:24 ] processpool.h:0378 info: send request to child 0
[ 09/13/18 21:52:24 ] mgr.cpp:0109 info: bind client sock 11 with server sock 9
我采用模拟HTTP报文发送给负载均衡服务器,服务器也确实有返回数据回来,我也用浏览器直接访问,但是会出现403
编码,表示禁止访问,可能服务器出于安全的考虑,禁止这样的中转站的存在,所以不能让客户端访问(纯属猜测)
大家也可以试试其他的网站,每个网站的结果都有些不一样
各个文件的作用
-
main.cpp:
- 设置命令行参数的处理
- 读取配置文件
- 解析配置文件
- 开始线程池的循环
-
processpool: 线程池,是整个项目的发动机
-
fdwrapper:操作fd的包裹函数
-
log:日志
-
conn:客户端
-
mgr:处理网络连接和负载均衡的框架
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