1.修改yum源
[base]
name=CentOS-$releasever - Base
baseurl=http://mirrors.aliyun.com/centos/7.6.1810/os/x86_64/
gpgcheck=0
[updates]
name=CentOS-$releasever - Updates
baseurl=https://mirrors.aliyun.com/centos/7.6.1810/updates/x86_64/
gpgcheck=0
[extras]
name=CentOS-$releasever - Extras
baseurl=https://mirrors.aliyun.com/centos/7.6.1810/extras/x86_64/
gpgcheck=0
2.执行更新命令
#yum -y update
3.重启
#reboot
4.验证
# uname -a
# cat /etc/redhat-release