ntpdの設定メモ

※OSはVine Linux 4.2。

# rpm -q ntp
ntp-4.2.0-10vl4

# vi /etc/ntp.conf

server  ntp.nict.jp
server  ntp.jst.mfeed.ad.jp
server  127.127.1.0     # local clock
fudge   127.127.1.0 stratum 10

driftfile /etc/ntp/drift
multicastclient                 # listen on default 224.0.1.1
broadcastdelay  0.008

authenticate no

# touch /etc/ntp/drift

# /etc/init.d/ntpd start

# /sbin/chkconfig ntpd on

# /usr/sbin/ntpq -p

     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*ntp.nict.jp     .NICT.           1 u   23   64  377   12.929  -11.842   2.287
+ntp.jst.mfeed.a 210.173.160.86   2 u   17   64  377    8.081   -9.032   2.538
 LOCAL(0)        LOCAL(0)        10 l    9   64  377    0.000    0.000   0.004

# /sbin/iptables -I RH-Firewall-1-INPUT 13 -p udp -m state --state NEW -m udp --dport 123 -j ACCEPT
※REJECTの前、13番目に入れるように設定。