NTP服务器的最小规格

Question

一个NTP服务器所需的最低规格是多少？我希望像这样配置NTP服务器，如下所示：

1>$ sudo apt install ntp
2>$ cat /etc/ntp.conf
3>$ sudo nano /etc/ntp.conf          

##########################
# Leap seconds definition provided by tzdata
leapfile /usr/share/zoneinfo/leap-seconds.list

# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/

statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable


# Specify one or more NTP servers.

#server 0.asia.pool.ntp.org iburst
#server 1.asia.pool.ntp.org iburst
#server 2.asia.pool.ntp.org iburst                

server 127.127.1.0 prefer
fudge 127.127.1.0 stratum 10                

# Use Ubuntu's ntp server as a fallback.
#pool ntp.ubuntu.com

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page 
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration

# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery limited
restrict -6 default kod notrap nomodify nopeer noquery limited

# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1

# Needed for adding pool entries
#restrict source notrap nomodify noquery

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
restrict x.x.x.x mask 255.255.255.0 nomodify notrap
#restrict 0.0.0.0 mask 0.0.0.0 nomodify notrap

# If you want to provide time to your local subnet, change the next line.
# (Again, the address is an example only.)
#broadcast 192.168.123.255

# If you want to listen to time broadcasts on your local subnet, de-comment the
# next lines.  Please do this only if you trust everybody on the network!
#disable auth
#broadcastclient                
#########################

4>$ sudo systemctl restart ntp   < Restart the NTP service for the changes to take effect>
5>$ sudo systemctl status ntp     

我需要知道NTP服务器对100台主机或1000台主机所需的最低规格是什么？有什么不同吗？

Answer 1

简而言之:如果您有100万个客户端，您可以将您的桌面机群中最老的PC机回收为专用的NTP服务器，它们可能会很好。

NTP将最小的负载放在一个系统上，您可以在一台相当低规格的机器上运行数百万个客户端。有关我在公共池中使用的VM的一些统计数据，请参见这个职位。它通常每天为1.5M唯一的客户端服务，在2016年年Snapchat大潮期间，它可以轻松地处理两倍(见下图)。

在你的帖子上还有几个笔记：

1. 您不应该使用本地时钟作为后盾。这已被废弃多年；孤儿模式是首选。
2. 您不应该计划只提供一个NTP服务器。四是有用的最低工作。有关配置的一些具体建议，请参见我的博客文章。