round robin dns vs load balancing

the performance of a single server is always limited, multiple servers and load balancing techniques must be used to meet the needs of a large number of concurrent accesses. The first load balancing technology is implemented through DNS, in

of a single server is always limited, multi-server and load-balancing techniques must be used to meet the needs of a large number of concurrent accesses. The first load-balancing technology is implemented through DNS, in DNS for

map the URL of the user request to a specific IP address, the world has 13 root servers, but usually for our domain name resolution is not the root server, but direct access to our LDNS (Local DNS Server), typically maintained by network operators.The first load balancing is implemented by building local DNS server, t

very important relay in the client send request, his role is to map the URL of the user request to a specific IP address, the world has 13 root servers, but usually for our domain name resolution is not the root server, but direct access to our LDNS (Local DNS Server), typically maintained by network operators.The first load balancing is implemented by building

balancing requirements.software Load Balancing solution is to install one or more additional software on one or more servers corresponding operating system to achieve load balancing, such as DNS

thrown load balancing in as a feat Ure. Round Robin: Round Robin passes each new connection request to the next server on line, eventually distributing C Onnections evenly across the array of machines being load balanced. Round

network load balancing on two general computers with Windows Server 2003 installed.Of the two computers, one is named w2003-1, the IP address is 202.206.197.190, and the other is named w2003-2, the IP address is 202.206.197.191.Plan the IP address used by the Network Server Load balancer cluster as 202.206.197.195 and the complete computer name of the Network Se

When the vertical expansion of the Web server becomes expensive or difficult, we need to consider the level of server expansion, namely load balancing technology. There are many techniques for load balancing, which we'll cover here.1.HTTP redirectionWe can do this at the code level by setting access to specific pages s

,ip6t_reject,nf_conntrack_ipv6,nf_defrag_ipv6 Characteristics of LVS Cluster 3.1 IP load balancing and load scheduling algorithm 1. IP Load Balancing TechnologyLoad balancing technology has a number of implementation scenarios,

, and the other is named W2003-2,ip address 202.206.197.191. The planning Network Load Balancing cluster uses an IP address of 202.206.197.195, and the complete computer name for the planning Network Load Balancing cluster is cbf001.com. You need to register this host name in the heinfo.edu.cn domain and set the addr

subsequent operations are based on the new URL (that is, the back-end server), after which the browser does not have a relationship with the dispatch server, resulting in several problems: Because of the different user's access time, the access page depth is different, thus each user to the respective back-end server caused the pressure also different. The dispatch server in the scheduling, can not know how much the current user will put pressure on the server, so this way can not achi

Load Balancing cluster (LB)How load Balancing clusters workWhen a user sends a request, the request is not immediately sent to the backend's real server (realservers), but is sent first to the Scheduler or Distributor (Director), and then the director, based on some scheduling algorithm, The request is sent to the back

server can be a Web server, a mail server, an FTP server , a DNS server, one or more of the video servers, and each real server is connected through a high-speed LAN or across a WAN. In a real-world application, Director server can also be the role of real server concurrently. As can be seen from the entire LVS structure, director server is the core of the entire LVS, currently, the operating system for director server can only be Linux and FreeBSD,

access the server normally.　　 DNS Server Load balancer uses a simple round-robin load algorithm, which does not distinguish between servers, does not reflect the current running status of servers, and cannot allocate more requests to servers with better performance, client Requests may even be concentrated on a server

w2003-2, the IP address is 202.206.197.191. Plan the IP address used by the Network Server Load balancer cluster as 202.206.197.195 and the complete computer name of the Network Server Load balancer cluster as cluster.heinfo.edu.cn. You need to register the host name in the heinfo.edu.cn domain and set the address to 202.206.197.195. If you do not have DNS, You

server.N54537real-server can provide many services, such as FTP, HTTP, DNS, Telnet, NNTP, SMTP, and so on. The master server is responsible for controlling the real-server. When a client makes a service request to LVS, director specifies a real-server to answer the request with a specific scheduling algorithm, and the client communicates only with the IP (that is, the virtual IP,VIP) of the load balancer.

effective way to extend the bandwidth of network devices and servers, increase throughput, enhance network data processing, and improve network flexibility and availability, balancing.Nginx/lvs/haproxy is currently the most widely used three load balancer software.The general use of load balancing is to use different technologies depending on the stage of the si

is not the root server, but direct access to our LDNS (Local DNS Server), typically maintained by network operators.The first load balancing is implemented by building local DNS server, the implementation is simple and easy to understand, for the same host name to assign multiple mappings, you can use round-

load balancingWe know that the role of load balancer in load balancing devices is crucial, and it plays a connecting role. On the one hand, receives the user's network request, on the other hand transfers the request according to some algorithm to the specific application server, realizes the

, the user's CGI program is responsible for tasks that avoid location loops.2. DNS-based load balancing (multi-host Single Domain Name load)Server Load balancer Based on server software needs to change the software, so it is often not worth the candle. Server