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Overview: why build your own Stratum 1
Precision, accuracy, stability: the vocabulary of metrology
Hardware and GNSS/PPS wiring
How GNSS constellations broadcast time
OS image and first boot
SSH hardening
System hardening: the basics
Updates and base packages
Real-time kernel (PREEMPT_RT)
Firmware: config.txt and cmdline.txt
Disabling unnecessary services
Filesystem: tmpfs and no swap
GNSS/PPS acquisition: udev, gpsd
CPU governor and thermal stability
Interrupt (IRQ) affinity
Network buffers
IPv6 networking: SLAAC, DHCPv6, Router Advertisements
Anatomy of the NTP packet
Chrony: the heart of the NTP/NTS system
Leap seconds
Hardware clock (PHC) and phc2sys
Active thermal stabilization
From bare crystal to pseudo-TCXO
nftables firewall
NGINX, Let's Encrypt and NTS
Post-quantum: TLS and NTS
fail2ban
Monitoring with Munin
Public telemetry
Logrotate
Hardening audit: Lynis, ANSSI, CIS
Final verification and acceptance tests
Joining pool.ntp.org
Verification: chrony's state in one command
Appendices: diagrams, glossary, resources
Performance: benchmarking against the national time reference

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Overview: why build your own Stratum 1

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