支持Root登录

编辑文件

sudo  /etc/ssh/sshd_config

修改

#PermitRootLogin prohibit-password
PermitRootLogin yes

重启ssh

sudo service ssh restart

换源

centos8

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-vault-8.5.2111.repo
yum clean all && yum makecache

centos7

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum clean all && yum makecache

CentOS同步时间

首先保证机器的网络正常

安装ntp工具

yum -y install ntp

同步时间

/usr/sbin/ntpdate -u cn.pool.ntp.org

写入硬件时间：

hwclock -w