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post(openwrt-nts): persist config across reboots

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Ming Di Leom 2025-05-08 09:45:39 +00:00
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source/_posts/nts-openwrt.md
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@ -2,6 +2,7 @@
title: Configuring NTS in OpenWRT
excerpt: Obtain time in an authenticated manner
date: 2024-10-12
updated: 2025-05-08
tags:
- openwrt
---
@ -46,7 +47,7 @@ uci set chrony.netnod.nts='yes'
Use NTS only.
```plain /var/etc/chrony.d/20-nts.conf
```plain /etc/chrony.d/20-nts.conf
# Require at least 2 reachable sources
minsources 2
@ -57,10 +58,22 @@ authselectmode require
cmdport 0
```
The actual config is actually in "/var/etc/chrony.d/", but the "/var" folder is not persistent across reboot.
So, a workaround is to save it into "/etc/chrony.d/", then copy to "/var" after boot.
Append these lines to "/etc/rc.local" before `exit 0`.
```sh /etc/rc.local
sleep 60
mkdir -p "/var/etc/chrony.d/"
cp "/etc/chrony.d/20-nts.conf" "/var/etc/chrony.d/20-nts.conf"
service chronyd restart
```
Preserve the config during upgrade.
```
echo "/var/etc/chrony.d/20-nts.conf" >> /etc/sysupgrade.conf
echo "/etc/chrony.d/" >> /etc/sysupgrade.conf
```
Commit the changes and restart the daemon.