一、停止邮件服务

[root@localhost ~]# systemctl stop postfix # 临时关闭

[root@localhost ~]# systemctl disable postfix # 永久关闭

Removed symlink /etc/systemd/system/multi-user.target.wants/postfix.service.

[root@localhost ~]#

二、停止打印服务：

[root@localhost ~]# systemctl stop cups.path # 临时关闭

[root@localhost ~]# systemctl stop cups.socket # 临时关闭

[root@localhost ~]# systemctl stop cups.service # 临时关闭

[root@localhost ~]# systemctl disable cups.path # 永久关闭

Removed symlink /etc/systemd/system/multi-user.target.wants/cups.path.

[root@localhost ~]# systemctl disable cups.socket # 永久关闭

Removed symlink /etc/systemd/system/sockets.target.wants/cups.socket.

[root@localhost ~]# systemctl disable cups.service # 永久关闭

Removed symlink /etc/systemd/system/multi-user.target.wants/cups.service.

Removed symlink /etc/systemd/system/printer.target.wants/cups.service.

[root@localhost ~]#

三、停止rpcbind：

[root@localhost ~]# systemctl stop rpcbind.socket # 临时关闭

[root@localhost ~]# systemctl stop rpcbind # 临时关闭

[root@localhost ~]# systemctl disable rpcbind.socket # 永久关闭

Removed symlink /etc/systemd/system/sockets.target.wants/rpcbind.socket.

[root@localhost ~]# systemctl disable rpcbind # 永久关闭

[root@localhost ~]#

四、关闭SELinux，将 /etc/sysconfig/selinux 中的 SELinux=enforcing 修改为 SELinux=disabled

临时关闭，重启失效：

#setenforce 0

#getenforce

五、关闭firewall：

#停止firewall

systemctl stop firewalld.service

#禁止firewall开机启动

systemctl disable firewalld.service

#查看默认防火墙状态(关闭后显示notrunning，开启后显示running)

firewall-cmd --state

六、关闭NetworkManager

# systemctl stop NetworkManager # 临时关闭

# systemctl disable NetworkManager # 永久关闭网络管理命令

   转自https://blog.csdn.net/weixin_42360711/article/details/116929674：