我的 chrony 时间服务器版本为：3.5-6ubuntu6.2，可以从另一个内部时间服务器获取时间，但不能从互联网上的时间服务器获取时间。您能帮我将我的 chrony 服务器与互联网上的时间服务器同步吗？
工作的内部ntp时间服务器可以与互联网同步
systemctl status ntp
● ntp.service - Network Time Service
Loaded: loaded (/lib/systemd/system/ntp.service; enabled; vendor preset: enabled)
Active: active (running)
但是 chrony 时间服务器无法做到这一点我重新启动了网络并检查 chrony 是否在线：
netplan apply
chronyc online
200 OK
chrony 服务正在运行
systemctl status chrony
● chrony.service - chrony, an NTP client/server
Loaded: loaded (/lib/systemd/system/chrony.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2020-12-28 09:59:58 CET; 11min ago
Docs: man:chronyd(8)
man:chronyc(1)
man:chrony.conf(5)
可以连接互联网
telnet www.google.de 80
Trying 216.58.212.163...
Connected to www.google.de.
nc -zvu ptbtime1.ptb.de 123
Connection to ptbtime1.ptb.de 123 port [udp/ntp] succeeded!
这是 chrony 服务器的配置
nano /etc/chrony/chrony.conf
pool pool.ntp.org iburst
server 192.53.103.108 iburst
pool 2.pool.ntp.org iburst
server 0.de.pool.ntp.org iburst
server 1.de.pool.ntp.org iburst
server 2.de.pool.ntp.org iburst
server 3.de.pool.ntp.org iburst
pool ntp.ubuntu.com iburst maxsources 4
pool 0.ubuntu.pool.ntp.org iburst maxsources 1
pool 1.ubuntu.pool.ntp.org iburst maxsources 1
pool 2.ubuntu.pool.ntp.org iburst maxsources 2
Chrony 承认存在
chronyc activity
200 OK
28 sources online
0 sources offline
10 sources doing burst (return to online)
0 sources doing burst (return to offline)
0 sources with unknown address
chronyc sources
210 Number of sources = 9
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^? ptbtime1.ptb.de 0 7 0 - +0ns[ +0ns] +/- 0ns
^? static.133.158.47.78.cli> 0 7 0 - +0ns[ +0ns] +/- 0ns
^? alpha.rueckgr.at 0 7 0 - +0ns[ +0ns] +/- 0ns
^? stratum2-2.NTP.TechFak.N> 0 7 0 - +0ns[ +0ns] +/- 0ns
^? totoro.ax86.net 0 7 0 - +0ns[ +0ns] +/- 0ns
^? 195.50.171.101 0 7 0 - +0ns[ +0ns] +/- 0ns
^? 82.165.77.164 0 7 0 - +0ns[ +0ns] +/- 0ns
^? 79.133.44.136 0 7 0 - +0ns[ +0ns] +/- 0ns
^? ntp1.radio-sunshine.org 0 7 0 - +0ns[ +0ns] +/- 0ns
但 chrony 并不同步
chronyc tracking
Reference ID : 00000000 ()
Stratum : 0
Ref time (UTC) : Thu Jan 01 00:00:00 1970
System time : 0.000000009 seconds fast of NTP time
Last offset : +0.000000000 seconds
RMS offset : 0.000000000 seconds
Frequency : 0.379 ppm fast
Residual freq : +0.000 ppm
Skew : 0.000 ppm
Root delay : 1.000000000 seconds
Root dispersion : 1.000000000 seconds
Update interval : 0.0 seconds
Leap status : Not synchronised
我该怎么做才能将 chrony 与互联网上的服务器同步？