最小化安装Linux系统初始化脚本

注：此脚本适用于centos 7/8、Ubuntu1804，具体需要根据实际情况进行测试调整。

此脚本包含的功能：

1. 允许 root 用户使用 ssh 登录
2. 关闭 selinux
3. 关闭防火墙
4. 设置 ps1
5. 设置默认编辑器为 vim
6. 自定义 vim
7. 自定义历史命令
8. 修改内核参数
9. 设置资源限制
10. 修改软件源
11. 安装常用包
12. 设置时间同步
13. 修改网卡为传统命令格式
14. 设置IP地址等

[root@centos8 ~]# cat init_v1.sh
#!/bin/bash
#
#**************************************************
#Author:                Xan_Yum
#QQ:                    7993167
#Email:                 waluna@qq.com
#Version:               1.0
#Date:                  2021-11-03
#FileName:              init_v1.sh
#Description:           system init
#URL:                   https://blog.waluna.top
#Copyroght (C):         2021 ALL rights reserved
#**************************************************

OS=`awk -F'"' '/PRETTY_NAME/{print $2}' /etc/os-release|tr ' ' '-'`

#1
set_ssh () {
    if [[ $OS == Ubuntu-18.04* ]];then
        sed -i.bak '/#PermitRootLogin/a PermitRootLogin yes' /etc/ssh/sshd_config
        systemctl restart sshd
    fi
    echo -e "e[32;1mPermit root login set completee[0m"
}

#2
disable_selinux () {
    if [[ $OS == CentOS* ]];then
        sed -i.bak 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
    fi
    echo -e "e[32;1mSElinux already disabled,Restart to take effecte[0m"

}

#3
disbale_firewall () {
    systemctl disable --now firewalld &> /dev/null
    echo -e "e[32;1mFirewall already disablede[0m"
}

#4
set_ps1 () {
    if [[ $OS == CentOS* ]];then
        echo "PS1='[e[1;36m][u@h W]\$ [e[0m]'" >> /etc/profile.d/env.sh
        . /etc/profile.d/env.sh
    elif [[ $OS == Ubuntu* ]];then
        echo 'PS1="[e[1;32m][${debian_chroot:+($debian_chroot)}u@h w]\$ [e[0m]"' >> .bashrc
        . .bashrc
    fi
    echo -e "e[32;1mPS1 already modify,Please login againe[0m"

}

#5
set_default_text_editor_vim () {
    echo "export EDITOR=vim" >> /etc/profile.d/env.sh
    . /etc/profile.d/env.sh
    echo -e "e[32;1mdefault_text_editor already modify vim,Please login againe[0m"
}

#6
set_vim () {
cat > ~/.vimrc > /etc/profile.d/env.sh
    echo -e "e[32;1mHistory modifye[0m"
}

#8
modify_kernel_parameters () {
    mv /etc/sysctl.conf{,.bak}
cat > /etc/sysctl.conf > /etc/security/limits.conf  /etc/apt/sources.list  /dev/null && hwclock -w' >> /var/spool/cron/root
        systemctl restart crond
    elif [[ $OS == CentOS-Linux-8* ]];then
        sed -i.bak '/^pool /c pool time1.aliyun.com iburst' /etc/chrony.conf
        systemctl restart chronyd && systemctl enable chronyd
        echo '*/5 * * * * chronyc -a makestep &> /dev/null && hwclock -w' >> /var/spool/cron/root
        systemctl restart crond
    elif [[ $OS == Ubuntu-18.04* ]];then
        echo '*/5 * * * * ntpdate time1.aliyun.com &> /dev/null && hwclock -w' >> /var/spool/cron/root
        systemctl restart cron
    fi
    echo -e "e[32;1mTime sync completee[0m"
}

#13
set_eth () {
    if [[ $OS == CentOS* ]];then
        sed -i.bak '/GRUB_CMDLINE_LINUX/s#"$# net.ifnames=0"#' /etc/default/grub
        grub2-mkconfig -o /boot/grub2/grub.cfg &> /dev/null
    elif [[ $OS == Ubuntu-18.04* ]];then
        sed -i.bak '/GRUB_CMDLINE_LINUX/s#"$#net.ifnames=0"#' /etc/default/grub
        grub-mkconfig -o /boot/grub/grub.cfg &> /dev/null
    fi
    
    echo -e "e[32;1mNetname already modify,Restart to take effecte[0m"
}

set_eth0 () {
    if [[ $OS == Ubuntu-18.04* ]];then
        mv /etc/netplan/01-netcfg.yaml{,.bak}
cat > /etc/netplan/01-netcfg.yaml  /etc/sysconfig/network-scripts/ifcfg-eth0  /etc/sysconfig/network-scripts/ifcfg-eth0  /etc/netplan/01-netcfg.yaml 

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原文链接: 最小化安装系统初始化脚本.