technology to actively detect each node.In most LAN-based clusters, the fastest response algorithm does not work well, because ICMP packets in the LAN basically respond within 10 ms, which does not reflect the differences between nodes; if a balance is made on the WAN, the response time is of practical significance for the user to select the server nearby. In addition, the more scattered the cluster topology, the more effective the method can be. Thi
Copyright Notice: Original works, declined reprint! Otherwise, the legal liability will be investigated.An official description of NLB, you must first understand the principles of NLB before building an NLB cluster
Network Load Balancing (NLB) features in Windows server R2 can enhance the availability of Internet server applications such as those used on Web, FTP, firewalls, proxies, virtual pr
backbone network from conventional third layer to comprehensive third-layer, fourth-layer switching function, its unique WAN integration capability and the access control based on layer fourth exchange have played a key role in secure and orderly network data transmission. In addition, Cabletron SmartSwitch router provides different levels of prioritization for specific business application data exchange based on the QoS features of layer fourth swit
request is sent. The f5. ltm series is widely used.
F5-BIG-LTM-3600-4G-R
3.Load Balancing for Wan
Server Load balancer is mainly applied to some large websites, and some people call it Remote Server Load balancer. for example, we have two Web servers, one at the Beijing I
Not long ago I was in charge of a well-known national manufacturing group's load balancing project. I was deeply touched by the project's application of gslb in a specific environment and learned a lot of related Load Balancing knowledge. Today, let's calm down and think about how to learn a lot through the project. du
Load BalancerIt can be a dedicated device or an application that runs on a common server. Distribute requests to servers that have the same content or provide the same services. Special purpose devices are generally only Ethernet interfaces, which can be said to be a multi-layer switch. The load balancer is typically assigned a virtual IP address, and all request
, not the difference between the nodes, if the balance on the WAN, the response time for the user to choose the nearest server is of practical significance , and the more dispersed the cluster topology, the more effective the method can be. This approach is the primary approach to advanced balancing based on topology redirection.3. 6 Weighting methodWeighted methods can only be used in combination with othe
With the decline in computer hardware prices and the development of computer network topology, distributed computer systems provide users with a rich set of resources. When studying distributed systems, people have noticed the following problem: in a network-Connected Multi-computer environment, some computers have heavy load at a certain time, the load on other
same time.
Support multi-address multiport management, each server can bind multiple virtual IP, each virtual IP can establish multiple open ports.
Supports fail-fast recovery, which automatically recovers the cluster online when a server fails to restart.
Support for unicast, multicast, IGMP multicast multiple cluster operation modes.
Support Event log management to quickly review cluster event records.
Iii. how NLB is used3.1.
, different WAN network segments) load balancing, the principle of the same LVS-DR;
Source: http://www.cnblogs.com/luminji/The copyright of this article is shared by the author and the blog. You are welcome to repost this article, but you must keep this statement without the author's consent andArticleThe original text connection is displayed at an obvious p
server. Implement piped management, allowing multiple requests to be sent to the NLB cluster at the same time. Multi-address multiport management is supported, each server can bind multiple virtual IP, each virtual IP can establish multiple open ports. Support for fast fault recovery and automatic recovery of cluster online when a server fails to reboot. Support for unicast, multicast, IGMP multicast multiple cluster operation modes. Supports event l
In multi-core CPUs, it is important to ensure that the tasks assigned to each CPU have a good load balance in order to perform the performance of multiple CPUs well. Otherwise, some CPUs are running, others are idle, and they are not able to perform the benefits of multicore CPUs.
To achieve a good load balance there are usually two scenarios, one is static
, 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
application image contains all the parts required for a business solution, including WEB sites, registry settings, files, COM + components, and so on. By reflecting the current state of the cluster's events, performance counters, and monitors, it is easy to monitor the operation of the cluster.
Application Center Cluster
With application Center, you can build multi-level clusters that can use a variety of load
longer;
Uneven distribution, if the configuration between several Web servers, can withstand the pressure is different, but the DNS resolution allocation of access is evenly distributed. Unbalanced distribution of user groups results in an imbalance in DNS resolution.
Session hold, if it is a Web site that requires authentication, this is fatal if the software architecture is not modified, because DNS resolution cannot permanently assign authenticated users access to the same server. Al
bandwidth consumption of single NIC, competitive network adapter and other shortcomings still exist.
In addition, some routers (especially Cisco products) do not support the automatic creation of unicast IP addresses and multicast mac ARP mappings, which require manual configuration. IGMP multicast (which can only be selected when multicast is selected), in addition to inheriting the benefits of multicasting, NLB sends an IGMP message every 60 seconds, allowing multicast packets to be sent onl
consumption of single NIC, competitive network adapter and other shortcomings still exist.
In addition, some routers (especially Cisco products) do not support the automatic creation of unicast IP addresses and multicast mac ARP mappings, which require manual configuration. IGMP multicast (which can only be selected when multicast is selected), in addition to inheriting the benefits of multicasting, NLB sends an IGMP message every 60 seconds, allowing multicast packets to be sent only to this c
cactiAdvantages of LVS:Good performance, close to hardware equipment network throughput and connection load capacity.LVS's Dr mode, which supports load balancing over a WAN. None of this other load balancing software is currently
differences between nodes; if a balance is made on the WAN, the response time is of practical significance for the user to select the server nearby. In addition, the more scattered the cluster topology, the more effective the method can be. This method is the main method used for advanced Balancing Based on topology redirection.
3.6 encryption Law
Weighted methods can only be used with other methods, which
pressure is different, but the DNS resolution allocation of access is evenly distributed. Unbalanced distribution of user groups results in an imbalance in DNS resolution.
Session hold, if it is a Web site that requires authentication, this is fatal if the software architecture is not modified, because DNS resolution cannot permanently assign authenticated users access to the same server. Although there is a certain local DNS cache, but it is difficult to ensure that during user access, the
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