对于学习过红帽RHEL6的系统或已经习惯使用service、chkconfig等命令来管理系统服务的用户可能要郁闷了，
因为在红帽RHEL7系统中管理服务的命令变成了“systemctl”，但使用方法大致相同，做一下对比。
例1：
[root@localhost ~]# systemctl status sshd.service ● sshd.service - OpenSSH server daemon Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: enabled) Active: active (running) since 一 2016-09-12 14:21:12 CST; 32min ago Docs: man:sshd(8) man:sshd_config(5) Main PID: 1642 (sshd) CGroup: /system.slice/sshd.service └─1642 /usr/sbin/sshd -D 9月 12 14:21:12 localhost.localdomain systemd[1]: Started OpenSSH server dae... 9月 12 14:21:12 localhost.localdomain systemd[1]: Starting OpenSSH server da... 9月 12 14:21:13 localhost.localdomain sshd[1642]: Server listening on 0.0.0.... 9月 12 14:21:13 localhost.localdomain sshd[1642]: Server listening on :: por... 9月 12 14:36:49 localhost.localdomain sshd[5238]: Accepted password for root... Hint: Some lines were ellipsized, use -l to show in full.
例2：
[root@localhost ~]# systemctl is-enabled sshd.service enabled