DNS轮循
  DNS轮循是指将相同的域名解释到不同的IP,随机使用其中某台主机的技术。但其具有明显的缺点:一旦某个服务器出现故障,即使及时修改了DNS设置,还是要等待足够的时间(刷新时间)才能发挥作用,在此期间,保存了故障服务器地址的客户计算机将不能正常访问服务器。DNS负载均衡采用的是简单的轮循负载算法,不能区分服务器的差异,不能反映服务器的当前运行状态,不能做到为性能较好的服务器多分配请求,甚至会出现客户请求集中在某一台服务器上的情况。

  F5 BIG-IP
点击在新窗口中浏览此图片  简介:F5 Networks 公司的著名硬件负载均衡交换机。支持硬件四层、七层交换。不同的型号性能不同,BIG-IP 6400可以支持800万条并发连接,低一点型号的可以支持400万条以上的并发连接。性能极高,但价格也不菲。
  价格:BIG-IP 6400的价格在16万元人民币左右。
  网址:http://www.f5.com.cn/(中国) http://www.f5.com/(全球)

  LVS(Linux Virtual Server)
  简介:软件四层交换。LVS是在Linux内核中作四层交换,只花128个字节记录一个连接信息,不涉及到文件句柄操作,故没有65535最大文件句柄数的限制。LVS性能很高,可以支持100~400万条并发连接。
  价格:免费、开源
  网址:http://zh.linuxvirtualserver.org/

  L7SW(Layer7 switching)
  简介:软件七层交换。这是一款类似LVS的新负载均衡软件,我没有实际应用过,性能未知,因此不作评价。这是它的英文介绍:Layer7 switching is driving a low-level engine using networking design to speed-up forwarding of data stream. Implementation in this project is split into a userspace daemon and a low-level kernelspace forwarding engine. Userspace daemon is responsible for scheduling and switching decisions. Kernelspace forwarding engine is responsible for forwarding stream and using TCP-Splicing scheme. TCP-Splicing is the postponement of the connection between the client and the server in order to obtain sufficient information to make a routing decision. This project is close to Linux Virtual Server project since lot of discusions on this topics have been made online and offline LVS project.
  价格:免费、开源
  网址:http://www.linux-l7sw.org/

  HAProxy
  简介:软件七层交换,反向代理服务器。目前还不支持虚拟主机,但其配置简单,拥有非常不错的服务器健康检查功能,当其代理的后端服务器出现故障,HAProxy会自动将该服务器摘除,故障恢复后再自动将该服务器加入。另外,HAProxy还支持双机热备。我曾经用过一段时间,能支持2~3万条并发连接。现在我用它做普通的小并发负载均衡,主要用到的是它的服务器健康检查功能。
  价格:免费、开源
  网址:http://haproxy.1wt.eu/

  Nginx
  简介:软件七层交换,反向代理服务器。能够很好地支持虚拟主机,可配置性很强,可以按URL做负载均衡。我目前一直在用,大约能支持3~5万条并发连接。
  价格:免费、开源
  网址:http://wiki.codemongers.com/NginxChs(中文维基)


技术大类 » 其他Unix技术 | 评论(36) | 引用(1) | 阅读(55936)
我所熟悉的网站负载均衡技术
[2007-11-2 22:46]
来源:Hugo.Leens 生活流水账
内容:转自 http://blog.s135.com/read.php/307.htm 了解目前流行的负载均衡技术 对于有钱的公司来说,硬件看来是最好的选择~ 看上去软件方式的LVS堪比硬件水平哦~ 估计配置起来要麻烦的多,不然低端的负载均衡交换机硬件还卖得出去么…… 莫非真的是中国人喜欢花钱买放心…… Nginx并发数比不上LVS,为啥不用LVS嗫?配置问题?还是服务器硬件档次问题……又或者是需求……所谓合适就好……   DNS轮循  DNS轮循是指将相同的域名解释到不同的I...
mysuso Homepage
2007-11-5 10:08
F5一般有谁在用,grin
张宴 回复于 2007-11-5 16:55
我们就在用。
outrace
2007-11-6 19:02
请问楼主HAProxy测试的数据是哪个版本的
因为目前haproxy更新很快。

另外请问一下,lvs的测试数据,是使用lvs文档中介绍的3种IP负载均衡中的那种方式的测试结果
nat ? / ip tun ? / dr
另外我看lvs提供下载的源代码都好老了。不太放心哦。

最近正在学习这些。还请楼主赐教。
张宴 回复于 2007-11-7 22:43
用的是 HAProxy 1.2.17 版本。
LVS nat
jackbillow Email
2007-11-14 15:13
以前HAproxy性能有些问题,现在应该好多了。:)
jackbillow Email
2007-11-14 15:26
对了,alteon也用的很多,我一个朋友,他们就是用的alteon。163和我们一个方案一样,用的是crescendo(cn-5000),这个设备也不错。
huicong7788 Email
2008-9-1 16:56
你好,我最近熟悉负载均衡。你那有相关资料吗?麻烦你给我发一份。邮箱:zhxsh@vip.qq.com
张宴 回复于 2008-9-1 20:38
http://blog.s135.com/read.php/346.htm

http://blog.s135.com/read.php/348.htm
xxdtpyy Email
2009-2-17 19:52
版主,您好:
        如果有时间的话,能否请教一个haproxy相关的问题?我现在测试用的版本是1.3.15.6的,配置文件如下:

maxconn 5120
#       log 192.168.10.180 local3 info
       log 127.0.0.1   local1 notice
       uid 501
       gid 502
       daemon
       quiet
       nbproc  2  
       pidfile /var/run/haproxy-private.pid
defaults
       mode    http
       option  httplog
       option  dontlognull
#       log 127.0.0.1 local3
       retries 3
       redispatch
       maxconn 2000
       contimeout      5000
       clitimeout      50000
       srvtimeout      50000

listen webfarm  192.168.10.180:80
      mode http
      stats enable
      balance  uri    
#      dispatch 192.168.10.180:80
#      cookie SERVERID insert indirect
      log global
      option httplog
      option logasap
      option forwardfor  
server web181 192.168.10.181:80 cookie app1inst1 check inter 2000 rise 2 fall 5
server web182 192.168.10.182:80 cookie app1inst2 check inter 2000 rise 2 fall 5
工作正常,能够根据URL的不同,而转发到不同的后台服务器上,但是就是不记录日志。
如果加-d参数启动haproxy的话,在前段是有信息的,但是就是不记录日志,至于网上流传的:
syslog.conf里加一行
local3.*         /var/log/haproxy.log
# touch /var/log/haproxy.log
# chown haproxy:haproxy /var/log/haproxy.log
# chmod u+x /var/log/haproxy.log
也都试过,可是/var/log/haproxy.log就是不记录日志,不知道为什么?
楼主能否指点一下?非常感谢!
xxdtpyy@tom.com
Max
2009-4-20 21:22
Radware?
higkoo Email Homepage
2010-6-21 23:31
你好!

我在使用LVS的时候并没有如上介绍那么好的性能,而且很不理想。

我把整个调优过程都记录下来了,希望您有空帮小弟指点迷津:

http://hi.baidu.com/higkoo/blog/item/f8943c60d16843d28cb10d17.html
cnrainbing Email
2011-8-31 16:08
张老师你怎么不用LVS(Linux Virtual Server)+Nginx实现负载呢?
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