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fix(timesync): ensure that auto-update waits for time sync (#609)

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- Added check to not attempt auto update if time sync is needed and not yet successful (delays 30 second to recheck).
- Added resync of time when DHCP or link state changes if online
- Added conditional* fallback from configured* NTP servers to the IP-named NTP servers, and then to the DNS named ones if that fails
- Added conditional* fallback from the configured* HTTP servers to the default DNS named ones.
- Uses the configuration* option for how many queries to run in parallel
- Added known static IPs for time servers (in case DNS resolution isn't up yet)
- Added time.cloudflare.com to fall-back NTP servers
- Added fallback to NTP via hostnames
- Logs the resultant time (and mode)
This commit is contained in:
Marc Brooks
2025-09-16 08:37:02 -05:00
committed by GitHub
parent 80a8b9e9e3
commit cf679978be
5 changed files with 69 additions and 27 deletions
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29
internal/timesync/ntp.go
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@@ -9,17 +9,32 @@ import (
"github.com/beevik/ntp"
)
var defaultNTPServers = []string{
var defaultNTPServerIPs = []string{
// These servers are known by static IP and as such don't need DNS lookups
// These are from Google and Cloudflare since if they're down, the internet
// is broken anyway
"162.159.200.1", // time.cloudflare.com IPv4
"162.159.200.123", // time.cloudflare.com IPv4
"2606:4700:f1::1", // time.cloudflare.com IPv6
"2606:4700:f1::123", // time.cloudflare.com IPv6
"216.239.35.0", // time.google.com IPv4
"216.239.35.4", // time.google.com IPv4
"216.239.35.8", // time.google.com IPv4
"216.239.35.12", // time.google.com IPv4
"2001:4860:4806::", // time.google.com IPv6
"2001:4860:4806:4::", // time.google.com IPv6
"2001:4860:4806:8::", // time.google.com IPv6
"2001:4860:4806:c::", // time.google.com IPv6
}
var defaultNTPServerHostnames = []string{
// should use something from https://github.com/jauderho/public-ntp-servers
"time.apple.com",
"time.aws.com",
"time.windows.com",
"time.google.com",
"162.159.200.123", // time.cloudflare.com IPv4
"2606:4700:f1::123", // time.cloudflare.com IPv6
"0.pool.ntp.org",
"1.pool.ntp.org",
"2.pool.ntp.org",
"3.pool.ntp.org",
"time.cloudflare.com",
"pool.ntp.org",
}
func (t *TimeSync) queryNetworkTime(ntpServers []string) (now *time.Time, offset *time.Duration) {