centos7 如何刷新本地的DNS缓存

 [root@fl2 ~]# ping dl.z.com
ping: unknown host dl.z.com
[root@fl2 ~]# /etc/rc.d/init.d/nscd restart
-bash: /etc/rc.d/init.d/nscd: No such file or directory
[root@fl2 ~]# /etc/rc.d/nscd restart
-bash: /etc/rc.d/nscd: No such file or directory
[root@fl2 ~]#