barracuda virtual load balancer

Nginx Server Load balancer dual-host High Availability If the Web server cluster is used as a city pool, the load balancing server is equivalent to the city gate, and its importance is self-evident. If the "City Gate" is closed, the access to the outside world will be broken. If a server is balanced, when the server fails, the whole website will be inaccessible.

IIS Server Load balancer-Application Request Route: ARR introduces Server Load balancer. I believe you are no longer familiar with it. This series mainly introduces the Server Load balancer software that can be used in IIS: micros

regular expression processing, can not do static and dynamic separation, and now many sites in this area have a strong demand, this is the advantage of nginx/haproxy+keepalived. If it is a large web site application, lvs/dr+keepalived implementation is more complex, especially after the Windows Server machine, if the implementation and configuration and maintenance process is more complex, relatively speaking, nginx/haproxy+ Keepalived is a lot easier. HAProxyHaproxy is characterized b

chat room and so on. 1, the software itself Do not support regular expression processing, can not do static and dynamic separation of ; and now many sites in this area have a strong demand, this is the advantage of nginx/haproxy+keepalived. 2, if the site is a large application, lvs/dr+keepalived implementation is more complex, especially after the Windows server's machine, if implemented and configured and maintenance process is more complicated , comparatively speaking, the nginx/hapro

environment, in order to easily automatically load each server to the host environment, we can first configure each server according to the load balancing configuration steps, in all the configuration processes, except for using the common virtual IP address, other settings should be selected according to the configuration requirements, but must follow 1 ~ The 3

I. Introduction of LVSLVS is a short name for Linux virtual server, the Linux web, is a free software project initiated by Dr. Zhangwensong and is now part of the Linux standard kernel. LVS is a TCP/IP-based load balancing technology that has high forwarding efficiency and the ability to process millions of concurrent connection requests.The IP load balancing tec

problem, unless the entire group of machines are all down, but considering that such a thing happens very small (unless it is a power outage, Otherwise it is not easy to happen). Before we introduced a cluster, our first query process was roughly the following: requesting the data tier and passing the necessary library-differentiated fields (typically user_id)? The data layer is based on a differentiated field route to a specific db. Data operations are performed within this deterministic db. T

not receive large traffic impact.5, the application of a wide range, because LVS work in the 4 layer, so it can almost all applications to do load balancing, including HTTP, database, online chat room and so on.The disadvantages of LVS are:1, the software itself does not support regular expression processing, can not do static and dynamic separation , and now many sites in this area have a strong demand, this is the advantage of nginx/haproxy+keepali

Ps:nginx/lvs/haproxy is currently the most widely used three load balancing software, I have been implemented in a number of projects, reference to some information, combined with some of their own experience, summed up. The general use of load balancing is to use different technologies depending on the stage of the site's ascent. Specific application needs to be specific analysis, if it is small and mediu

Web page, time-out and so on, and will return the wrong request resubmitted to another node, but the disadvantage is that the URL is not supported to detect;6, Nginx can only support HTTP and email, so much smaller in the scope of application, this it's weak;7, Nginx is not only a good load balancer/reverse proxy software, it is also a powerful Web application server. LNMP is now also a very popular web ar

is a virtual IP address of keepalived. It is an external public IP address and also an IP address pointed to by DNS. Therefore, when designing the website architecture, you must apply for an external IP address from your IDC. 11. during actual project implementation, we found that LVS and nginx have excellent support for HTTPS, especially LVS, which is easier to process. 12. During LVS + keepalived and nginx + keepalived troubleshooting, both of them

important thing is whether the kernel supports ipvs and compilation after compilation. After using the new kernel, you may encounter the root file I have not solved the self-check problem so far, as if I had switched the kernel. Two Kernel File Systems are estimated. Conflict exists. PDF files create http://www.pdffactory.com with "FinePrint pdffacloud Pro" trial version LVS use document VS-NAT VS/NAT (Virtual Server via Netw

, packet disinfection, and other functions ｡ The following are the main features of F5 BIG-IP as an HTTP Load balancer: ① F5 BIG-IP provides 12 flexible algorithms to distribute all traffic evenly to each server, but to the user, just a virtual server ｡ (2) F5 BIG-IP can confirm whether the application can return the corresponding data to the request. If a server

Summary: For a large website, Server Load balancer is an eternal topic. With the rapid development of hardware technology, more and more Server Load balancer hardware devices are emerging, such as F5 big-IP, Citrix NetScaler, and radware, however, the high price is often prohibitive, So

;events { worker_connections 1024;}http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; upstream myServer{ server www.myapp1.com:80; server www.myapp2.com:8080; } server { listen 80; server_name my22; location / { proxy_pass http://myServer; } }}Sets the backend of the reverse proxy as the two servers of server

Nginx tomcat cluster and Server Load balancer configuration instanceI. Introduction to concepts used in nginx tomcat 1. Reverse Proxy. When a client request arrives, the reverse proxy receives the request and forwards the request to the backend server. If load balancing is performed, the request is distributed to the Server L