ntp.conf中pool和server的分别
https://serverfault.com/questions/1011314/can-i-use-both-pool-and-server-configurations-in-ntp#:~:text=pool%20is%20the%20same%20as%20server%2C%20except%20it,via%20AD%20DS%27s%20domain%20name.%20%E2%80%93%20John%20Mahowald
按我的理解和实践:
pool是池子,池中的服务器都可以参与或不参与校时,由ntpd进程自已决定,只要ntp.conf中任一个pool成功校时,则本机和向下级服务都能成功
server是指定服务器,ntp.conf中指定的所有server都必须参与校时,如果其中一个server校时失败,则整个校时也将失败,同时向下级服务也失败,如果下级使用ntpdate -d 192.168.1.1会发现有server dropped: strata too high的报错并返回no server suitable for synchronization found