Package: ntpdate
Version: 4.2.2+dfsg-2.1
The relevant lines from my ntp.conf file:
peer 192.35.100.1 key 101 minpoll 4 iburst
server 127.127.29.0 minpoll 1 maxpoll 4 iburst
Result in ntpdate trying uselessly to sync up to 127.127.29.0
while failing to query the perfectly good server at 192.35.100.1.
It's not causing me any problems, but perhaps the script could
be made fractionally smarter.
Something like
sed -rne 's/^(server|peer) ([-_.[:alnum:]]+).*$/\2/p' /etc/ntp.conf | grep -v
'^127\.127\.'
or even (allowing alternate whitespace and making the server name regexp
a bit stricter)
sed -rne 's/^(server|peer)[ \t]+([_[:alnum]][-_.[:alnum:]]*)[ \t].*$/\2/p'
/etc/ntp.conf | grep -v '^127\.127\.'
Alternatively, perhaps if there are both "peer" and "server" lines,
peers should be given absolute precedence...
# Servers to check (Separate multiple servers with spaces.)
# This code will take the server list from /etc/ntp.conf, if that exists,
# so you only have to keep it in one place.
# Peers (if any) are most trusted, and preferred.
NTPSERVERS=$(sed -rne 's/^peer[ \t]([-_.[:alnum:]]+)[ \t].*$/\1/p'
/etc/ntp.conf 2>/dev/null)
# Then any configured servers
if [ -z "$NTPSERVERS" ]; then
NTPSERVERS=$(sed -rne 's/^server[ \t]([-_.[:alnum:]]+)[ \t].*$/\1/p'
/etc/ntp.conf 2>/dev/null)
fi
# A good fallback list if /etc/ntp.conf is missing or unhelpful
if [ -z "$NTPSERVERS" ]; then
NTPSERVERS="0.debian.pool.ntp.org 1.debian.pool.ntp.org
2.debian.pool.ntp.org 3.debian.pool.ntp.org"
fi
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