Best Practices: Performance Tuning Guide for Building Web Servers on CentOS

Abstract: This article aims to provide some performance tuning best practices for users building web servers on CentOS, aiming to improve the performance of the server. and response speed. Some key tuning parameters and commonly used optimization methods will be introduced, and some sample codes will be provided to help readers better understand and apply these methods.

1. Turn off unnecessary services

When building a web server on CentOS, some unnecessary services will be started by default. These services will occupy system resources and have no obvious impact on the performance of the web server. promote. Therefore, we should shut down these unnecessary services to free up resources.

Use the following command to list the running services:

systemctl list-units --type=service --state=running

Choose to close unnecessary services according to the actual situation, such as turning off the mail service:

systemctl stop postfix
systemctl disable postfix

2. Adjust the kernel parameters

Optimizing kernel parameters is an important step in improving server performance. Kernel parameters can be adjusted by modifying the /etc/sysctl.conf file. The following are some commonly used kernel parameter tuning solutions:

1. Increase the limit on the number of file handles

# 增加系統(tǒng)最大文件句柄數(shù)
fs.file-max = 65535

# 增加每個進程可以打開的文件句柄數(shù)限制
ulimit -n 65535

2. Increase the limit on the number of TCP connections

# 增加系統(tǒng)的最大并發(fā)TCP連接數(shù)
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
net.ipv4.tcp_max_tw_buckets = 5000
net.ipv4.tcp_max_syn_backlog = 1024
net.core.somaxconn = 65535

3. Eliminate group chat fragmentation

# 消除群聊分片
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_sack = 0
net.ipv4.tcp_dsack = 0

4. Increase the system TCP buffer size

# 提高TCP接收窗口緩沖區(qū)大?。▎挝唬鹤止?jié)）
net.ipv4.tcp_rmem = 4096 87380 4194304

# 提高TCP發(fā)送窗口緩沖區(qū)大?。▎挝唬鹤止?jié)）
net.ipv4.tcp_wmem = 4096 16384 4194304

# 提高系統(tǒng)的TCP連接跟蹤表的大小
net.netfilter.nf_conntrack_max = 65536

After modifying the above parameters, use the following command to enable It takes effect:

sysctl -p

3. Use a high-performance web server

Choosing an appropriate web server also has an important impact on performance. On CentOS, Nginx and Apache are commonly used web servers.

1. Nginx

Nginx is a high-performance HTTP and reverse proxy server that uses an asynchronous non-blocking event-driven architecture to easily handle large traffic requests.

Install Nginx:

yum install nginx

Configure Nginx:

Edit /etc/nginx/nginx.confFile:

user www-data;
worker_processes auto;
worker_cpu_affinity auto;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

http {
    # 配置HTTP服務器
    ...
}

2. Apache

Apache is a feature-rich and widely used web server. Although its performance is slightly inferior to Nginx, it can still provide good performance in some specific scenarios.

Install Apache:

yum install httpd

Configure Apache:

Edit /etc/httpd/conf/httpd.confFile:

ServerLimit 2048
MaxClients 2048

4. Use cache acceleration

Using caching technology can effectively improve the performance of the web server. The following two methods can be used for cache acceleration:

1. HTTP Cache

By setting the appropriate Cache-Control and ExpiresResponse header allows the client to cache static resources, reduce the load on the server, and improve the user's access experience. The sample code is as follows:

location /static {
    expires 7d;
}

2. Reverse proxy cache

Use reverse proxy cache to cache dynamic content and reduce requests to the backend server. You can use Nginx's proxy_cache module to implement reverse proxy caching. The sample code is as follows:

proxy_cache_path /var/nginx/cache levels=1:2 keys_zone=my_cache:10m max_size=10g inactive=60m;
server {
    ...
    location / {
        proxy_cache my_cache;
        proxy_cache_valid 200 301 302 5m;
        proxy_pass http://backend;
    }
}

Conclusion

By closing unnecessary services, adjusting kernel parameters, using high-performance web servers and using cache acceleration, the web server built on CentOS can be better Good performance and responsiveness. I hope the performance tuning guide provided in this article will be helpful to you.

Reference link:

1. https://www.digitalocean.com/community/tutorials/5-tips-to-speed-up-your-nginx-web-server
2. https://www.digitalocean.com/community/tutorials/how-to-optimize-nginx-configuration

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