Contents
Overview
Its common practice to create an Isolated VLAN for Home Automation gear and IoT devices. Doing so will make your environment inherently more secure, but it also presents challenges. In my case my Home Assistant server wasn't keeping accurate time. This article will briefly demonstrate how to change the NTP server Home Assistant connects to for time syncronizations.
Background Info
HassOS runs on an Overlay File System, which means that edits to files from the command line won't survive a reboot (assuming you can even make changes, often times you'll get an error stating that its a Read-Only File System). So how do you make changes?
First: Read [1]
I had done this, but had challenges getting the USB stick to passthrough to my HassOS VM on Boot. So I went the alternative route by creating a CONFIG folder in the boot partition, BUT WHERE IS THE BOOT PARTITION!!!
Open the console of your HassOS and login as root. Then at the command line type: logon
ha > login # mkdir -p /mnt/boot/CONFIG # echo -e "[Time]\nNTP=10.20.30.40\nFallbackNTP=10.20.30.41" > /mnt/boot/CONFIG/timesyncd.conf
Replace 10.20.30.40 and 10.20.30.41 with your desired NTP servers.
Alternatively you can:
# vi /mnt/boot/CONFIG/timesyncd.conf
[Time] NTP=10.20.30.40 FallbackNTP=10.20.30.41
Once /mnt/boot/CONFIG/timesyncd.conf has been created you can reboot the Host
# reboot
Notes
You can confirm the changes by logging in again and running:
# cat /etc/systemd/timesyncd.conf
It should reflect the changes you made above.
I also noticed that the /mnt/boot/CONFIG folder is removed after reboot. This is normal, and your changes should persist future reboots.
Reference
https://github.com/home-assistant/operating-system/blob/dev/Documentation/configuration.md
https://github.com/home-assistant/supervisor/issues/957#issuecomment-528948200