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post(nts-openwrt): require nts sources

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Ming Di Leom 2024-10-12 22:30:38 +00:00
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@ -44,6 +44,25 @@ uci set chrony.netnod.iburst='yes'
uci set chrony.netnod.nts='yes'
```
Use NTS only.
```plain /var/etc/chrony.d/20-nts.conf
# Require at least 2 reachable sources
minsources 2
# Use NTS sources only
authselectmode require
# Disable chronyc remote access
cmdport 0
```
Preserve the config during upgrade.
```
echo "/var/etc/chrony.d/20-nts.conf" >> /etc/sysupgrade.conf
```
Commit the changes and restart the daemon.
```
@ -88,4 +107,23 @@ config nts
option systemcerts 'yes'
```
```
cat /var/etc/chrony.d/10-uci.conf
server time.cloudflare.com iburst nts
server nts.netnod.se iburst nts
allow 192.168.1.1/24
makestep 1.0 3
nocerttimecheck 1
```
```
chronyc sources
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^* time.cloudflare.com 3 6 17 13 -1188us[-1395us] +/- 11ms
^- nts.netnod.se 2 6 17 13 +229us[ +22us] +/- 85ms
```
Lastly, highly recommend to hardcode the IP address of the chosen NTP servers into "/etc/hosts", especially when using DNSSEC-validating DNS client, to avoid unresolvable NTS domains when the time is not correct.