模板制作时centos8可以选择最小化安装
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selinux:
vi /etc/selinux/config
SELINUX=enabled 改为 SELINUX=disabled
reboot生效
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防火墙：
关闭：systemctl stop firewalld.service
禁用：systemctl disable firewalld.service
查看状态：systemctl status firewalld.service
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centos8开启NeworkManager.service服务