更换阿里云yum源

 sed -e 's|^mirrorlist=|#mirrorlist=|g' -e 's|^#baseurl=http://dl.rockylinux.org/$contentdir|baseurl=https://mirrors.aliyun.com/rockylinux|g'  -i.bak  /etc/yum.repos.d/[Rr]ocky*.repo


 dnf makecache

防火墙修改 firewalld 为 iptables

停止并禁用firewalld

systemctl stop firewalld
systemctl disable firewalld

安装并配置iptables

yum -y install iptables-services

systemctl start iptables

iptables -F

systemctl enable iptables

service iptables save

禁用selinux

setenforce 0

sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

cat /etc/selinux/config

grubby --update-kernel ALL --args selinux=0
# 查看是否禁用，grubby --info DEFAULT
# 回滚内核层禁用操作，grubby --update-kernel ALL --remove-args selinux

设置时区

timedatectl set-timezone Asia/Shanghai

保存系统快照为Justinstall

安装时钟同步，同步下时间

yum install -y chrony

chronyc -a makestep