as the Hot Standby. all requests are distributed to the Master server, switch to the backup server immediately to improve the overall system reliability.
Server load balancer settings
Apache can meet the above two requirements. Let's first discuss how to implement load balancing. First, you need to enable several Apache modules:
Program code
LoadModule proxy_mod
Server planning: The entire system in the RHEL5U1 server 64-bit version, by the Xen-based virtual machine, wherein the cluster management node * 2, SQL node * 2, Data node * *, Web Service node * *, the data node is made up of 2 groups, each group of two units of the form:
configurationApache can meet the above two requirements. Let's first discuss how to implement load balancing. Assume that the domain name of an Apache server is www.a.com. You must first enable several modules of Apache:Httpd. conf code
Loadmodule proxy_module modules/mod_proxy.so
Loadmodule proxy_balancer_module modules/mod_proxy_balancer.so
Loadmodule proxy_http_module modules/mod_proxy_http.so
Mod_proxy provides the proxy server function. mod
single heavy load operation is shared to multiple node devices for parallel processing. After each node device finishes processing, the results are summarized and returned to the user, the system processing capability has been greatly improved, which is also known as cluster ing tering.
The second layer means that a large amount of concurrent access or data traf
, we follow the laws of human cognition, what? Why? This article describes some concepts and meanings of database segmentation and briefly introduces some common segmentation rules. The distributed data layer discussed in this topic is not just that. It is a complete data layer solution. What is it like? Next, I will elaborate on the complete ideas and implementation methods of this research topic.
The Distributed Data solution provides the following functions:
(1) provide database sharding rule
request and response is http: // 192.168.6.38: 3 times of the 6888 server (recall (2) Server Load balancer configuration. (2) Server Load balancer is weighted by the number of requests. (3) Server Load balancer is weighted by tra
Server Load balancer
SLB Load Balance is built on the existing network structure. It provides a cheap, effective, and transparent method, to expand the bandwidth of network devices and servers, increase throughput, enhance network data processing capabilities, and improve network flexibility and availability. Server Load
there is a machine down, it is only one of the db n one of the data can not access it, which we can accept, at least more than before the segmentation of the situation is much better, not the entire DB can not access. In general applications, such machine failure caused by the data is not accessible is acceptable, assuming our system is a high-concurrency e-commerce site? The economic losses caused by single-node machine outages are very serious. In
. The client program is not affected by the server cluster and requires no modification. The scalability of the system is achieved by transparently joining or deleting a node in the server cluster, by detecting node or service process failures and correctly resetting the system to high availability.The abstract architecture of LVS is divided into three tiers: Load
is not a test. Of course, there is always a solution to the problem. We introduce the concept of clustering , which I call group, that is, each node of the library we introduce multiple machines, each machine holds the same data, in general, many of these machines load, when there is a downtime situation, The load balancer
group, which is the node of each library we introduce multiple machines, each of which holds the same data, and in general the load is distributed by multiple machines, and the load balancer distributes the load to the machine that is down when there is an outage. This solv
concept of clustering , which I call the group, which is the node of each library we introduce multiple machines, each of which holds the same data, and in general the load is distributed by multiple machines, and the load balancer distributes the load to the machine that i
: This article mainly introduces (summary) the advantages and disadvantages of NginxLVSHAProxy server load balancer software. For more information about PHP tutorials, see. PS: Nginx/LVS/HAProxy is currently the most widely used three load balancing software. I have implemented these software in multiple projects. I have referenced some materials and combined som
, improving network flexibility and availability.
Server Load balancer has two meanings: first, a large amount of concurrent access or data traffic is distributed to multiple node devices for separate processing, reducing the user's waiting for response time. Second, computing of a single heavy load is distributed to m
each node :)
You can also add the following elements to the master configuration file of the HTTP. conf file:Sethandler server-statusOrder deny, allowDeny from allAllow from allYou can easily observe the current running status of the master server, as long as you enter xuanfei/Server-status in the address bar
Performance Test and comparison report on Apache Server Load
balancemember are members in the cluster. Port 8009 is the AJP port name of Tomcat.
The above amendment: This was neglected during the test yesterday and was discovered only during the test at the company today. You must note that route = worker1 and route = worker2 in the balancermember line cannot be added. Once added, distributed access will not be performed through the Apache designation, therefore, you must remove it here. Otherwise, operations will only be performed in a tomcat container.
log cannot be written to the problem that eventually causes the entire application to crash.3. Logging to logging server you can use a logging software, such as a syslog, to write all the logs to a central server. Although this method requires more configuration, he also provides the most robust solution.
PHP Load Balancer Instance
If you want to use load balanc
and configure, and is easy to test. It can print errors in logs. It takes a long time to configure and test LVS. LVS is highly dependent on the network.3. It can handle high load pressure and stability. In the case of poor hardware, it can support tens of thousands of concurrent requests, and the load is relatively smaller than LVS.4. nginx can detect internal server faults through ports, such as processin
Server Load balancer (SLB) is a load balancing service that distributes traffic among multiple ECs instances. SLB can expand the external service capability of the application system through traffic distribution, and improve the availability of the application system by eliminating spof.
(In connection with CDN, CDN uses Server
: worker1 and worker2:
Worker. balance1.balanced _ workers = worker1, worker2
5. advanced lb Worker attributes:
JK 1.2.x adds two new attributes: local_worker_only and local_worker, which provide new load balancing and fault tolerance support for lb worker.
Let's take an actual environment as example:
A cluster has two nodes (worker1 worker2), one web server before and after tomcat workers, and one load
The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion;
products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the
content of the page makes you feel confusing, please write us an email, we will handle the problem
within 5 days after receiving your email.
If you find any instances of plagiarism from the community, please send an email to:
info-contact@alibabacloud.com
and provide relevant evidence. A staff member will contact you within 5 working days.