使某服务自动启动
systemctl enable httpd.service
使某服务不自动启动
systemctl disable httpd.service
检查服务状态
systemctl status httpd.service
显示所有已启动服务
systemctl list-units --type=service
启动某服务
systemctl start httpd.service
停止某服务
systemctl stop httpd.service
重启某服务
systemctl restart httpd.service
开启防火墙22端口
iptables -I INPUT -p tcp --dport 22 -j ACCEPT
关闭SElinux:
修改/etc/selinux/config文件中的SELINUX="" 为disabled
彻底关闭防火墙
sudo systemctl status firewalld.service
sudo systemctl stop firewalld.service
sudo systemctl disable firewalld.service
