[root@c7-1~]#cat/etc/centos-releaseCentOSLinuxrelease7.9.2009(Core)[root@c7-1~]#yum-yinstallchrony[root@c7-1~]#vim/etc/chrony.conf#自带server0.centos.pool.ntp.orgiburstserver1.centos.pool.ntp.orgiburstserver2.centos.pool.nt