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Load balancing techniques and configuration suggestions for building a web server on CentOS
Abstract: In high-concurrency Web applications, load balancing technology plays a vital role. This article will introduce how to build a high-availability load balancing cluster under CentOS, and provide some configuration suggestions and code examples.
1. Introduction to load balancing technology
Load balancing (Load Balancing) is a technology that improves system performance and availability by distributing workloads to multiple servers. It can effectively avoid overloading a single server and improve the stability and reliability of the system.
2. Choose the appropriate load balancing algorithm
The load balancing algorithm determines how to distribute requests to back-end servers. Common algorithms include Round Robin, Least Connections, Source IP Hash, etc. It is very important to choose the appropriate algorithm based on the actual needs of the application.
3. Install and configure Nginx load balancing
Nginx is a high-performance web server and reverse proxy server that is widely used in CentOS systems. The following are the steps to install and configure Nginx:
yum install nginx
Install Nginx. /etc/nginx/nginx.conf
, add the following content: http { upstream backend { server backend1.example.com; server backend2.example.com; # 添加更多后端服务器 } server { listen 80; server_name example.com; location / { proxy_pass http://backend; # 其他代理配置 } } }
systemctl start nginx
Start Nginx service. 4. Use Haproxy to achieve load balancing
Haproxy is a powerful load balancing software with high performance and high reliability. The following are the steps to install and configure Haproxy:
yum install haproxy
Install Haproxy. /etc/haproxy/haproxy.cfg
, add the following content: global log /dev/log local0 log /dev/log local1 notice maxconn 4096 tune.ssl.default-dh-param 2048 defaults log global mode http option httplog option dontlognull retries 3 timeout http-request 10s timeout queue 1m timeout connect 10s timeout client 1m timeout server 1m frontend http-in bind *:80 default_backend servers backend servers balance roundrobin server backend1 example1.com:80 check server backend2 example2.com:80 check # 添加更多后端服务器
systemctl start haproxy
Start the Haproxy service. 5. Frequently Asked Questions and Tuning Suggestions
6. Summary
This article introduces the load balancing techniques and configuration suggestions for building a web server under the CentOS system. By selecting an appropriate load balancing algorithm, installing and configuring Nginx or Haproxy, and optimizing and adjusting related parameters, a high-availability and high-performance load balancing cluster can be achieved.
Note: The above code examples are for reference only, please modify and adjust according to the actual situation.
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