ntp

(tested during ntp/bullseye backport to jessie)

Built-in test suite

debuild
# do it again manually
make check

smoke tests

service ntp start
#ntpdc -c peers  # deprecated, now hangs, see #867227
ntpq -c peers

server1# service ntp start
server1# iptables -I INPUT 1 -p udp --dport 123 -j ACCEPT

server2# service ntp stop
server2# date -s now-1mn
server2# ntpdate -v server1

server1# service ntp start
server1# iptables -I INPUT 1 -p udp --dport 123 -j ACCEPT

server2# # edit /etc/ntp.conf, comment out pools, add server server1
server2# date -s now-1mn
server2# service ntp start
server2# ntpq -c peers
# be very patient
server2# date

clknetsim

• https://mlichvar.fedorapeople.org/clknetsim/

• https://github.com/mlichvar/clknetsim

• https://github.com/mlichvar/ntptestsuite

Fix Makefile: /usr/include/sys/time.h -> /usr/include/x86_64-linux-gnu/sys/time.h.

cd ntclknetsim/
make
cd ntptestsuite/
PATH=/usr/sbin:$PATH ./testall.sh

Tests appear flacky but can trigger segfaults. Mostly works for jessie’s ntp, but completely fails for buster & up.

Copyright (C) 2021 Sylvain Beucler