Linux server security and performance optimization: the best of both worlds

Linux server security and performance optimization: the best of both worlds

In today's Internet era, Linux server has become the preferred server operating system for most enterprises and individuals. How to improve the security and performance optimization of Linux servers has become an important issue that every administrator and operation and maintenance personnel pay attention to.

This article will introduce some commonly used Linux server security and performance optimization methods and techniques, and provide corresponding code examples.

1. Security Optimization

1. Prohibit root remote login

In order to prevent remote hacker attacks, remote login of the root account should be prohibited. This can be achieved by editing the SSH configuration file /etc/ssh/sshd_config and setting "PermitRootLogin" to "no":

PermitRootLogin no

2. Enable firewall

Using a firewall can limit access to the server and traffic control, increasing the security of the server. Commonly used firewall tools include iptables and firewalld. Here is an example rule from iptables that only allows SSH connections from specified IP addresses:

iptables -A INPUT -p tcp -s 192.168.1.100 --dport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP

3. Regularly update the system and software

Regularly updating the server's system and software is an important measure to maintain server security. You can use the following commands to update the system and software packages:

apt-get update
apt-get upgrade

2. Performance optimization

1. Reasonably allocate hardware resources

In the allocation of hardware resources of the server, resources such as CPU, memory, and disk space should be reasonably allocated according to the needs and load of the application to improve the performance of the server. You can use tools such as top, htop, and vmstat to monitor server resource usage.

2. Optimize system parameter settings

Optimizing the system parameter settings of the Linux server can significantly improve the performance of the server. The following are some commonly used parameter adjustment examples:

Disable irrelevant services:
service bluetooth stop
service cups stop
chkconfig bluetooth off
chkconfig cups off

Adjust the limit on the number of open files:
echo 'fs.file-max = 65535' >> /etc/sysctl.conf
sysctl -p

Optimize TCP connection parameters:
echo 'net.ipv4.tcp_fin_timeout = 30' >> /etc/sysctl.conf
echo 'net.ipv4.tcp_tw_reuse = 1' >> /etc/sysctl.conf
sysctl -p

3. Use caching and acceleration technology

Using caching and acceleration technology can greatly improve the performance of the server. Here are some common techniques and code examples:

Use Nginx as a reverse proxy server:
location / {

proxy_pass http://backend;

}

Use Memcached as a cache server:
$mc = new Memcached();
$mc->addServer('localhost', 11211);
$value = $mc->get('key');

Use Redis as cache server:
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$value = $redis->get ('key');

Summary:

By optimizing the security and performance of the Linux server, the stability and response speed of the server can be improved at the same time, and potential security risks can be reduced. Administrators and operation and maintenance personnel should flexibly use relevant methods and technologies based on actual needs and specific situations to achieve a win-win situation of security and performance optimization. At the same time, we must always pay attention to new technologies and vulnerabilities, and maintain continuous learning and improvement of Linux server security and performance optimization.

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