The Design & Realization Of Mirror Load & Accelerated Access System Of Jilin Provice Government Potorl

With the developing electronic government affair. Government Potorl has been growned.As the important process of sunny and open government,government Potorl would give service to the people.Now,government Potorl has been one of the most important things that the government master do.As the windows of service and drumbeating,Jilin provice government Potorl improved resuscitating and development economy of jilin.We construct the mirror load and Accelerated Access system for the smooth and safety running of jilin provice government Potorl.Using the system we can solve trouble of communication between south and north,balance loading of Potorl servers,filtration of IP data stream.Technology of mirror load and Accelerated Access is used by most of Potorl.Potorl published by a lot of cache server.These cache server keep consistency of the website data by technology of remote synchronization.When you visit the website,the mirror load and Accelerated Access system will lead you to visit the nearest and fastest server.Now ChinaCache inc is the most professional and largest Cache Service Provider.It is difficult and unnecessary for government to constructing a CDN network like ChinaCache or hiring the service of ChinaCache.We can not use the complex technology like ChinaCache but a smple technology like mirror load and Accelerated Access system of jilin provice government Potorl.The PotorlWebsite Accelerated Access system of jilin provice government.This system has two kinds of solution,one is (SSDC) simple server and double connection,the other is (DSDCI) double server and double connection and intelligent DNS.We use DSDCI technology to construct the system.This technology is easier and more safety and more deeply cost than the others.By using this technology,system would support working online and publishing content. This technology is fit to all of government Potorl.The article has introduced and analysed the process that we designed and Realized Mirror load and Accelerated Access System of Jilin Provice Government Potorl.It has five chapters.The first chapter introduced the background of investigation and the subject of the article.The second chapter introduced and analysed composing of technology and development of technology and effect of technology such as solaris,bind,rsync and tcp wrapper.The third chapter introduced and analysed demand and design of the system.The fourth chapter described structure of the system,script of the system,process of disposing the function module,process of the system testing and result of the system running.The article may divide into two part.One is the part of expatiation.This part includes the first and the second chapter.The other is the part of design and realization.This part includes the third and the fourth chapter.The part of expatiation introduced the development of Jilin Provice Government Potorl and the technology of the Potorl using.Jilin Provice Government Potorl come into existence in 2000 year and published in state on the 27th day of March in 2001 year.The Potorl is made up of 50 departmental website.With the development of Jilin Provice Government Potorl,it has been the window that the jilin provice opened by and the window that the jilin provice has been seen by.It has been depended on the Potorl that tha development of economy, community and culture of jilin.Now the access amount is most of 10,000,000.The large access amount affect the capability of the Potorl server badly.Half the visitors comes from out of jilin provice.The bottle-neck of the bandwidth that the south telecom connect to the north CNC would lead user get response from Jilin Provice Government Potorl slowly.In order to resolve pivotal contradiction,improve the efficiency of responsing and stability of running.We begin to do the job of design and realization of mirror load and accelerated access System of jilin provice government Potorl.The goal of the mirror load and accelerated access system is keeping jilin provice government Potorl running smoothly and safely.Using the system we can solve trouble of communication between south and north,balance loading of Potorl servers,improve the safety of the Potorl.The part of design and realization is the most important and difficult part of the article. This part introduced the design and realization of the system.The system is based on the solaris 9 operating system.With disposing the software such as bind,rsync,tcp wrapper and compiling the script of running,we can realize intelligent DNS, synchronization of data and filtration of IP data stream.The system include three modules.The module of intelligent DNS is based on the software which named BIND 9.3.2.The DNS can response the ip address to the user basing the running script that the manager compiled.We can accelerated access and realized connection of south-north by this way.The module of data synchronization is based on the software which named rsync2.6.9.This software can built mirror of files like files of server on client.It fit to synchronize large and complex files between server and clients.It can work better when it has little difference between server and clients.The module of ip filtration is based on the software which named tcp wrapper7.6.This software will control the request of network services and improve safety of the system.After compiling this software,the system will create a programe named tcpd.Tcpd will replace the network services such as in.telnetd.When some want to telnet the potorl server,tcpd will deny or allow the request basing the running script.Now,the system has been designed.We are testing the system.After testing successfully,we would use it formally.Once using it,we can get twice the result with half the effort.Once using it, the safety,request time, stability of the Potorl would be improved.