CentOS是一款基于Red Hat Enterprise Linux（RHEL）源代码的免费开源操作系统，适用于服务器和桌面环境。
CentOS定制是指在CentOS操作系统基础上，根据用户的需求进行个性化设置和优化，以下是一些常见的CentOS定制方法：
1、更新系统
执行以下命令更新系统到最新版本：
“`
sudo yum update
“`
2、安装常用软件
使用yum包管理器安装常用软件，
“`
sudo yum install vim wget curl nettools
“`
3、配置网络
编辑网络配置文件/etc/sysconfig/networkscripts/ifcfgeth0，根据实际情况修改IP地址、子网掩码、网关等信息。
4、防火墙配置
安装并启动firewalld防火墙：
“`
sudo yum install firewalld
sudo systemctl start firewalld
sudo systemctl enable firewalld
“`
开放特定端口，例如开放SSH端口：
“`
sudo firewallcmd zone=public addport=22/tcp permanent
sudo firewallcmd reload
“`
5、禁用无用服务
执行以下命令禁用无用服务：
“`
sudo systemctl disable NetworkManagerwaitonline.service
sudo systemctl disable NetworkManagerdispatcher.service
sudo systemctl disable NetworkManagerdhclient.service
sudo systemctl disable NetworkManager.service
“`
6、调整内核参数
编辑内核参数配置文件/etc/sysctl.conf，根据实际情况添加或修改内核参数，
“`
vm.swappiness = 10
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_fin_timeout = 30
“`
使配置生效：
“`
sudo sysctl p
“`
7、优化文件句柄数限制
编辑/etc/security/limits.conf文件，添加以下内容：
“`
* soft nofile 65535
* hard nofile 65535
* soft nproc 65535
* hard nproc 65535
“`
使配置生效：
“`
sudo sysctl p
“`
8、优化内存分配策略
编辑/etc/sysctl.conf文件，添加以下内容：
“`
vm.dirty_ratio = 60
vm.dirty_background_ratio = 10
vm.dirty_expire_centisecs = 120000000000000000000000000000000000000000000000000000000000000000000000000123456789aab123456789cdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklm
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