68 lines
1.8 KiB
Markdown
68 lines
1.8 KiB
Markdown
# Chrony config files
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For some reason Debian package for Chrony doesn't include other config files
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so that has to be done by hand like
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```
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confdir /etc/chrony/chrony.d
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```
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## Windows
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Refer to ../../Windows/time/README.md
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## Other random notes
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On pools, the default maxsources is 4 and pools would be resolved until
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there would be 4 names while the documentation for Telia and Snopyta says
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they have only 3. Cloudflare again resolves to two per IP version, so I
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assume that means 2.
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## Commands of interest:
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### Chrony itself
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Note: -N uses names specified in config instead of reverse name lookupping
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then.
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- `chrony -N activity` - what sources are doing
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- `chrony -N authdata` - can show that server uses NTS
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- `chrony -N ntpdata` - a lot of data on the servers
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- `chronyc offline` - offline mode
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- `chronyc online` - reconnects servers
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- `chrony -N sources` - used timeservers and their statuses
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- `chrony -N tracking` - local status (stratum and own clock etc.)
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### nmap
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Checking that something is an NTP server? Needs root:
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```
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nmap -sU -p 123 --script=ntp-info 192.168.0.1
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```
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Checking that something has NTS?
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```
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nmap -p 4460 -Pn ntp.example.net
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```
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In [GitHub user jauderho's curated NTS list](https://gist.github.com/jauderho/2ad0d441760fc5ed69d8d4e2d6b35f8d)
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user [cadusilva suggests this command instead](https://gist.github.com/jauderho/2ad0d441760fc5ed69d8d4e2d6b35f8d?permalink_comment_id=4192632#gistcomment-4192632):
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```'
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chronyd -Q -t 3 'server NTP_SERVER_HERE iburst nts maxsamples 1'
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```
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### Firewall configuration
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In case local clients or peers are wanted,
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```
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ufw allow from 192.168.0.0/16 to any port 123 proto udp
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ufw allow from fe80::/10 to any port 123 proto udp
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```
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A bit wide `192.168.x.x`, but so is `conf.d/local-servers,conf` and
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`fe80://10` isn't ULA either.
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