F5 is a well-known Server Load balancer product. I believe many people will not know it. So how does it maintain sessions? Let's start with the definition of session persistence. As an image metaphor: Session persistence can be seen as a string of pearls, so we split each Pearl and put it in a different box for storage and then put it into a string, that is, the
Some time recently, we started touching on load balancing, from hardware F5 to Citrix Netscalar. However, because the hardware configuration is not complicated, but the expensive price also makes the general user prohibitive (a hundred thousand of to hundreds of thousands of), so can only turn to nginx,squid this kind has the reverse proxy function software. Fort
from:http://yuhongchun.blog.51cto.com/1604432/697466
Now the trend of Web site development on the use of Network Load balancing with the increase of site size according to different stages to use different technologies:One is the hardware to carry out, the common hardware has more expensive NetScaler, F5, Radware and array and other commercial load
Three major software load balancer comparisons (LVS, Nginx, HAproxy)(Information from the network, made part of the supplementary instructions)LVS:1. Strong anti-load capability, high performance, can reach F5 60%, low memory and CPU resource consumption2. Work in the Network 4 layer, through the VRRP protocol (for Pro
This section describes the problems encountered after nginx Server Load balancer is used:
Session Problems
File Upload/download
Generally, multi-server load splitting is used to solve server load problems. Common solutions include:
The website portal is connected to the server
service (FAN) immediately notifies the client to reconnect with other VIPs. The client selects other VIPs in tnsnames. ora to continue the attempt until the connection is successful. Can I use an IP address to connect directly without using the vip connection? The answer is yes, but it takes 30 seconds to notify the client after the connection fails. The price of 30 seconds is too high, and the meaning of high availability is completely lost.
The
of your application.
So, seize this opportunity :). of course, the price is that it requires a little more complexity for your application development. This is the content to be covered in this article.
Then you may say to yourself, 'but how do I know I'm using server load balancer? '. The most honest answer is that if you are asking this question, most of you a
Today, the 'large Server' model has passed, replacing it with a large number of small servers, using a variety of load balancing technologies. This is a more feasible way to minimize hardware costs.
The 'more servers' mode has more advantages than the 'large Server' mode in the past. It is reflected in two aspects:
1. If the server goes down, the Server Load balan
I. Main Server Load balancer Technologies
1. Cisco Ethernet channel network balancing)
2. WindowsNLB Technology
3. LinuxLVS Technology
4. Server Load balancer (such as F5)
Ii. Redundancy Technology
1. CsicoHSRP Hot Backup route
2. Windows Cluster Technology
3. LinuxH
load balancing, so this experiment can only install a keepalived;The keepalived has built-in IPVSADM functionality, so you don't need to install the IPVSADM package, or write and execute the Lvs_dir script.
1. Preparatory work
Main keepalived (Scheduler dir): 192.168.242.128Real server rs1:192.168.242.129, gateway reverts to previous original gatewayReal server rs2:192.168.242.130, gateway reverts to previous original gatewayvip:192.168
load balancing is mainly through the server node to install the device specifically for load balancing, such as F5, and software load balancing is to complete the request distribution work by installing some software with load balancing function or module on the server, suc
In the past, running a large web application meant running a large web server. Because your application attracts a large number of users, you will have to add more memory and processors to your server. Today, the 'large server' model has passed, replacing it with a large number of small servers, using a variety of load balancing technologies. This is a more feasible way to minimize hardware costs.
The 'more servers' mode has more advantages than the
Build a Server Load balancer cluster with LVS in Linux
Common open-source load balancing software: nginx, lvs, and keepalivedCommercial Hardware load equipment: F5, Netscale1. Introduction to LB and LVSLB clusters are short for load
First, the problems encounteredWhen we deploy a Web application with an IIS server, when many users have high concurrent access, the client responds very slowly and the customer experience is poor, because when IIS accepts a client request, it creates a thread that consumes large memory when the thread reaches thousands of. At the same time, because these threads are switching, the CPU usage is also high, which makes IIS more difficult to perform. So how do we solve this problem? Second, how t
HAProxy is a proxy software that provides high availability, server load balancer, and TCP and HTTP applications, HAProxy is a completely free proxy solution that provides TCP and HTTP applications quickly and reliably with HAProxy. HAProxy is applicable to websites with large loads. these sites usually need session persistence or layer-7 processing. HAProxy supports tens of thousands of concurrent connecti
Server Load balancer solutions include hardware and software solutions. Mainstream hardware solutions:
F5 BIG-IP
Citrix netscalar
A10 A10
Array
Redware
LVS (Linux virtual server) is a layer-4 network switching or routing software solution. It implements switching or routing through kernel framework module ipvs and a set of rules configured on the framework
html; index index.html index.htm; proxy_pass http://nginxDemo; #配置方向代理地址 }Such as:3. Start Nginx and Tomcat to accessI am a Windows system, so just double-click Nginx.exe in the nginx-1.10.1 directory.can be viewed in Task ManagerFinally enter the address in the browser: http://localhost:8080/nginxDemo/index.jsp, each visit will take turns to access Tomcat (if F5 refresh is not used, it is recommended to try to put the mouse point
Linux Server Load balancer cluster system solution-Linux Enterprise Application-Linux server application information. For details, refer to the following section.
1. Introduction to Linux virtual servers
Linux Virtual Server (LVS) is a high-availability Server Load balancer cluster system. The system can provide
Ubuntu server 10.04, resin 3.1.10, nginx-0.7.65 Server Load balancer website
Software and Hardware architecture
Internet-> fire wall-> F5 Load balancer-> router-> Web servers (Ubuntu + nginx + resins)-> dB servers (Aix + Oracle)-> storage
1. Install Ubuntu
Install it in vi
DNS round robinDNS round robin refers to interpreting the same domain name to different IP addresses and randomly using a host technology. However, it has obvious disadvantages: Once a server fails, even if the DNS settings are modified in time, it still takes enough time (refresh time) to take effect. During this period, the client computer that saves the address of the faulty server cannot access the server normally. DNS load balancing uses a simple
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