Centos 7 systemctl 命令
systemctl 是系统服务管理器命令，它实际上将 service 和 chkconfig 这两个命令组合到一起。
| 任务 | 旧指令 | 新指令 |
| 使某服务自动启动 | chkconfig –level 3 httpd on | systemctl enable httpd.service |
| 使某服务不自动启动 | chkconfig –level 3 httpd off | systemctl disable httpd.service |
| 检查服务状态 | service httpd status | systemctl status httpd.service （服务详细信息） systemctl is-active httpd.service （仅显示是否 Active) |
| 显示所有已启动的服务 | chkconfig –list | systemctl list-units –type=service |
| 启动某服务 | service httpd start | systemctl start httpd.service |
| 停止某服务 | service httpd stop | systemctl stop httpd.service |
| 重启某服务 | service httpd restart | systemctl restart httpd.service |
下面以nfs服务为例：
1.启动nfs服务
systemctl start nfs-server.service
2.设置开机自启动
systemctl enable nfs-server.service
3.停止开机自启动
systemctl disable nfs-server.service
4.查看服务当前状态
systemctl status nfs-server.service
5.重新启动某服务
systemctl restart nfs-server.service
6.查看所有已启动的服务
systemctl list -units --type=service
开启防火墙22端口
iptables -I INPUT -p tcp --dport 22 -j ACCEPT
如果仍然有问题，就可能是SELinux导致的
关闭SElinux：
修改/etc/selinux/config文件中的SELINUX=”” 为 disabled，然后重启
彻底关闭防火墙：
sudo systemctl status firewalld.service sudo systemctl stop firewalld.service sudo systemctl disable firewalld.service
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