我的chrony時間伺服器版本為：3.5-6ubuntu6.2，可以從另一個內部時間伺服器取得時間，但無法從網路上的時間伺服器取得時間。您能幫我將我的 chrony 伺服器與網路上的時間伺服器同步嗎？
工作內部ntp時間伺服器可以與網際網路同步
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時間伺服器做不到我重新啟動網路並檢查chrony是否在線：
netplan apply
chronyc online
200 OK
chrony 服務正在運行
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)
可連接網路
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!
這是 chrony 伺服器的配置
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 認識到有來源
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
但是chrony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
我可以做什麼來將 chrony 與互聯網上的伺服器同步？