CentOS7_init.sh

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#centos #linux #运维

这是一个针对CentOS7的初始化脚本，主要内容包括设置yum加速源，安装常用软件包，关闭selinux，禁用防火墙和NetworkManager，调整系统最大打开文件数以及进行网络参数优化。执行此脚本后，建议重启系统以应用所有配置。

#!/bin/bash
# centos7_init.sh  
# Date：2022/06/05
# Description：CentOS初始化脚本  该脚本只适用于CentOS 7.x

# yum加速
sed -i '/enabled/s/1/0/' /etc/yum/pluginconf.d/fastestmirror.conf
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
curl -4 -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo

# yum安装常用软件包
yum install -y ntp vim bind-utils net-tools epel-release git wget lrzsz gcc gcc-c++

# epel加速
mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
wget -4 -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

# 关闭selinux
sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config

# 关闭防火墙、Networkmanager、postfix
systemctl stop firewalld
systemctl stop NetworkManager
systemctl disable firewalld
systemctl disable NetworkManager
systemctl stop postfix
systemctl disable postfix

# 修改最大打开文件数为65535
echo "* - nofile 65535" >> /etc/security/limits.conf
echo "* - nproc 65535" >> /etc/security/limits.conf

# 网络参数优化
echo "net.ipv4.ip_forward = 0" >> /etc/sysctl.conf
echo "net.ipv4.tcp_syncookies = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_tw_recycle = 1" >> /etc/sysctl.conf
echo "net.ipv4.tcp_tw_reuse = 1" >> /etc/sysctl.conf

echo "所有的配置已经优化完成，请重启以使所有的配置生效。"