systemd是CentOS中的系统和服务管理器。可以使用以下命令来使用systemd:
systemctl start servicename
systemctl stop servicename
systemctl restart servicename
systemctl reload servicename
systemctl status servicename
systemctl enable servicename
systemctl disable servicename
systemctl list-units --type=service
systemctl list-unit-files --type=service
通过这些命令,可以轻松地管理CentOS系统中的各种服务。