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the policy, add the Snat policy, the source interface is the intranet port, the service pool references the service pool created in the previous step, the rest defaults, and the policy is started after completion.Port mappings:1, create service pool, type Select server, fill in the server IP, port to be mapped2, add the policy, the type is Dnat policy, the source address is 0 destination address for the external network IP, select the port, the extranet interface and reference the service pool
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
following point in time:1, non-running normal processes become real-time processes (such as through the Sched_setscheduler system call);2, after the dispatch (there may be a real-time process is preempted by higher priority real-time processes);3, the real-time process is awakened, if not immediately run on the current CPU (it is not the current CPU on the highest priority process);It seems that the load balancin
Windows Apache does load balancing The first time I saw this headline I was surprised that Apache can still do load balancing? It's so powerful. After a survey found that it can, and the function is not bad. This is thanks to the Mod_proxy module. Is worthy of the mighty Apache AH. Less nonsense, the following is to
types: ro Roundrobin , which represents a simple pollingSTATIC-RR , which is based on the weightLeastconn , indicating that the minimum number of connections is processed firstSource , which represents the source of the request based IPRI that represents the request based on the URIRl_param that represents the URl parameter according to the requestHDR (name) , which indicates that each HTTP request is locked according to the HTTP request HeaderRdp-cookie (name) , which indicates that each TCP
. Mode=0 (BALANCE-RR) (Balanced rotation strategy)Link load balancing increases bandwidth, supports fault tolerance, and a link failure automatically switches the normal link. The switch needs to configure the aggregation port, Cisco is called the Port channel.Features: Transmission packet sequence is transmitted sequentially (that is: the 1th packet to go eth0,
From: http://hi.baidu.com/_kouu/item/479891211a84e3c9a5275ad9 In an SMP (symmetric multi-processor) Environment, each CPU corresponds to a run_queue (executable Queue ). If a process is in the task_running state (executable State), it will be added to one of the run_queue (and will only be added to one run_queue at the same time ), so that the scheduler can schedule it to run on the CPU corresponding to run_queue.A cpu corresponds to a run_queue design, which has the following advantages:1. A pr
systems. Haproxy is very useful for web systems that are extremely large and require persistent connectivity or four-and seven-layer processing, such as e-commerce , and haproxy can also be used in MySQL Load balancing of databases (read operations)2. Difference between four-and seven-layer load balancingA four-tier load
Comparison of haproxy lvs nginx Load Balancing For the software that implements load balancing, let's take a look at it in detail. In terms of performance and stability, LVS is the best, basically reaching 60% of the performance of F5 hardware equipment, and other 10% are a little difficult. However, the configuration
NetScaler is the industry-leading service delivery platform. NetScaler supports a wide range of platforms with comprehensive application security settings, acceleration, and load balancing (including GSLB) capabilities. The main advantages of NetScaler are as follows:1) Powerful load balancing: The NetScaler has a powe
CPU, disk I/O, or network I/O, the central controller selects the most suitable server to distribute customer requests. Iii. Server Load balancer using DNS As the number of users accessing CEN servers increases dramatically, it is difficult for a single server to meet users' access needs. How can we ensure normal user access? There are many solutions, such as using Windows 2000 or Windows Server 2003 to provide the network
will be the request for this service IP all directed to Dr, and Dr received the packet according to the scheduling algorithm, to find the corresponding realserver, Change the destination MAC address to Realserver's Mac and send it to this realserver? At this point, the Realserver receives this packet, it is equal to receive the packet directly from the client, the processing is returned to the client directly? Because Dr wants to change the two-layer header, So the DR and Realserver must be in
requirements. Requirements for switches and routers When you plan to use VLANs to prevent the exchange of data floods, you must ensure that the switch supports VLAN settings; When using multicast, some routers do not support the mapping of a unicast IP address to a multicast MAC address and need to be set manually. Requirements for communication protocols network adapters that are bound to the cluster can only install the TCP/IP protocol, and you
four-tier load balancersThe so-called four layer is the fourth layer in the iOS model, the four-tier load balancer is also called the four-layer switch, mainly through the analysis of IP layer and TCP/UDP layerBased on IP and port number load balancing, common Lvs,f5The mai
are very close, and the difference is more in number.1.3 Cluster system mainly solves the following problems: High Reliability (HA): The use of cluster management software, when the primary server failure, the backup server can automatically take over the work of the primary server, and timely switch to the past in order to achieve uninterrupted service to users. Load
complete network load balancing and high availability network technology are composed of two aspects: one is multi-server binding and load balancing, and the other is a server Load balancer bound with multiple NICs, here we mainly discuss the Server
Nginx is a server software that is also a high-performance HTTP and reverse proxy server, as well as a proxy mail server. In other words, we can publish the website on the Nginx, can realize the load balance (enhances the reply efficiency, avoids the server crashes), but also can realize the function as the mail server to send and receive the mail. And the most common is to use Nginx to achieve load
Software load Balancing is generally implemented in two ways: the implementation of soft load based on operating system and the implementation of soft load based on third party application. LVS is a kind of soft load based on Linux operating system, Haproxy is an open source
In general, load balancing is the client's request to the backend of the various real servers to achieve load balancing purposes. There is another way is to use two servers, one as the primary server (master), the other as a hot Standby, the request is all to the primary server, when the primary server, immediately
network load balancing driver acts as a filter between the cluster Adapter driver and the TCP/IP stack for communication between hosts. Make sure that the features of the preceding algorithms, unicast and multicast, are as follows: Unicast (unicast) in NLB) In unicast mode, NLB re-assigns a MAC address (This MAC address is called the cluster MAC address) to the NLB network adapter enabled for each NLB no
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