Script 1

关闭防火墙、selinux、完全关闭swap。

#!/bin/bash
# Maintainer: zhengmingyue
# Email: 348063831@qq.com
echo -e "The script is used to setting Centos Linux 7 or Centos Linux 8.  \n \
e.g. Close firewalld, set selinux and so on. \n"

# Close firewall. 
systemctl disable firewalld --now >> /dev/null

# Close selinux.
setenforce 0 
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
stat=`grep 'SELINUX=disabled' /etc/selinux/config`
echo -e "Selinux configuration: \n ${stat}. \nEnforcing: \n `getenforce` \n"

# Deactivate swap partion.
swapoff -a  >> /dev/null
sed -ri 's/.*swap.*/#&/' /etc/fstab

echo -e "Swap partion information:"
echo "Swap: `free -m | grep Swap`"
cat /etc/fstab | grep swap

Script 2

设置本地源，需要将系统镜像挂载到光驱设备/dev/sr0。
注意下方我是直接删除/etc/yum.repos.d/下的所有repo，如有重要repo，请备份。

#!/bin/bash
# Maintainer: zhengmingyue
# Email: 348063831@qq.com 
echo "The script is used to set yum local repo CentOS Linux 7 or 8."
VERSION_ID=`cat /etc/os-release | grep "VERSION_ID" | awk -F"=|\"|=\"| " '{ print $2 }'`

rm -rf /etc/yum.repos.d/*
touch /etc/yum.repos.d/Local.repo
mkdir -pv /mnt/cdrom
mount /dev/sr0 /mnt/cdrom

if [ $VERSION_ID == "7" ]
then
cat > /etc/yum.repos.d/Local.repo << EOF
[Local]
name=CentOS-Local
baseurl=file:///mnt/cdrom
enabled=1
gpgcheck=0
EOF
elif [ $VERSION_ID == "8" ]
then

cat > /etc/yum.repos.d/Local.repo << EOF
[Base]
name=CentOS-Base
baseurl=file:///mnt/cdrom/BaseOS
enabled=1
gpgcheck=0

[AppStream]
name=CentOS-AppStream
baseurl=file:///mnt/cdrom/AppStream
enabled=1
gpgcheck=0
EOF

Script 3

安装一些软件的脚本，可以根据不同的系统版本安装。建议在Script 2脚本之后运行，或者自行保证源可用。

if分支下面的安装命令，请根据自己需求，自行更改。

#!/bin/bash
# Maintainer: zhengmingyue
# Email: 348063831@qq.com 
echo "The script is used to install some tools for minimal installation CentOS Linux 7 or CentOS Linux 8."
VERSION_ID=`cat /etc/os-release | grep "VERSION_ID" | awk -F"=|\"|=\"| " '{ print $2 }'`
echo "Install something tools"
if [ $VERSION_ID == "7" ]
then
    yum install -y bash-completion net-tools curl lsof vim chrony
elif [ $VERSION_ID == "8" ]
then
    dnf install -y bash-completion net-tools curl lsof  vim chrony
fi

# Installed bash-completion cloud used key tab to supplement command, 
# net-tools could used ifconfig and or so.
# Curl and lsof is tool for system.
# Chrony is time synchronization service. I suggest that each cluster install this service.Can use chrony script.