14.4. ntpd ¤Îµ¯Æ°¤ÈÆ°ºî³Îǧ

NTP ¥µ¡¼¥Ð¡¼¥×¥í¥°¥é¥à¤Î¼ÂÂΤϡ¢ntpd ¤È¤¤¤¦¥Ç¡¼¥â¥ó¤Ç¤¹¡£Turbolinux 11 Server ¤Ç ntpd ¤Îµ¯Æ°¤äÄä»ß¤ò¹Ô¤¦¤Ë¤Ï¡¢/etc/init.d/ntpd ¥¹¥¯¥ê¥×¥È¤Ë°Ê²¼¤Î¥ª¥×¥·¥ç¥ó¤ò»ØÄꤷ¤Æ¼Â¹Ô¤·¤Þ¤¹¡£

/etc/ntp.conf ¤ÎÊÔ½¸¸å¡¢ntpd ¤òµ¯Æ°¤·¤Þ¤¹¡¢¤¿¤À¤·¡¢ntpd ¤ÏÂçÉý¤Ê»þ¹ï¤Î¥º¥ì¤¬¤¢¤ë¤ÈÀµ¾ï¤ËÆ°ºî¤·¤Þ¤»¤ó¡£ntpd ¤òµ¯Æ°¤¹¤ë¤È¤­¤Ï¡¢NTP ¥¯¥é¥¤¥¢¥ó¥È¤Ç¤¢¤ë ntpdate ¥³¥Þ¥ó¥É¤ò»ÈÍѤ·¤Æ¡¢»öÁ°¤Ë»þ¹ïƱ´ü¤ò¹Ô¤Ã¤Æ¤ª¤­¤Þ¤¹¡£°Ê²¼¤Î¤è¤¦¤Ë»²¾È¤¹¤ë NTP ¥µ¡¼¥Ð¡¼¤ò°ú¿ô¤Ë¤·¤Æ¡¢ntpdate ¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¤Þ¤¹¡£

# ntpdate ntp.example.com
16 Nov 14:19:35 ntpdate[3111]: step time server 192.168.0.7 offset -192.907528 sec

¼«¥Û¥¹¥È¤Î¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤¬ 192 ÉäۤÉÃÙ¤ì¤Æ¤¤¤¿¤³¤È¤¬¤ï¤«¤ê¤Þ¤¹¡£¤â¤¦°ìÅÙ¡¢ntpdate ¤ò¼Â¹Ô¤·¤Æ¤ß¤Þ¤¹¡£°Ê²¼¤Î¤è¤¦¤Ë¡¢¸íº¹¤¬¤Û¤È¤ó¤É¤Ê¤¯¤Ê¤Ã¤¿¤³¤È¤ò³Îǧ¤Ç¤­¤Þ¤¹¡£

# ntpdate ntp.example.com
16 Nov 14:20:55 ntpdate[3114]: adjust time server 192.168.0.7 offset -0.000167 sec

»þ¹ïƱ´ü¤ò´°Î»¤·¤¿¤¢¤È¤Ë¡¢°Ê²¼¤Î¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¡¢ntpd ¥Ç¡¼¥â¥ó¤òµ¯Æ°¤·¤Þ¤¹¡£

# /etc/init.d/ntpd start

ntpd ¤òÄä»ß¤¹¤ë¤Ë¤Ï¡¢¼¡¤Î¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¤Þ¤¹¡£

# /etc/init.d/ntpd stop

Turbolinux 11 Server ¤Îµ¯Æ°»þ¤Ë ntpd ¤ò¼«Æ°Åª¤Ë³«»Ï¤¹¤ë¤Ë¤Ï¡¢°Ê²¼¤Î¤è¤¦¤Ë chkconfig ¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¤Æ¤ª¤­¤Þ¤¹¡£

# chkconfig ntpd on

ÀßÄê¥Õ¥¡¥¤¥ë¤òÊѹ¹¤·¤¿¾ì¹ç¤Ï¡¢Êѹ¹¤òÈ¿±Ç¤¹¤ë¤¿¤á¤Ë ntpd ¤òºÆµ¯Æ°¤¹¤ëɬÍפ¬¤¢¤ê¤Þ¤¹

# /etc/init.d/ntpd restart

14.4.1. ntpd ¤ÎÆ°ºî³Îǧ

ntpd ¤¬¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤òƱ´ü¤¹¤ëÍͻҤϡ¢ntpq ¥³¥Þ¥ó¥É¤Ç¸«¤ë¤³¤È¤¬¤Ç¤­¤Þ¤¹¡£°Ê²¼¤Î¤è¤¦¤Ë¡¢-p ¥ª¥×¥·¥ç¥ó¤òÉÕ¤±¤Æ¼Â¹Ô¤·¤Þ¤¹¡£

# ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== *clock.nc.fukuok .GPS. 1 u 28 256 17 22.742 -682108 1.059 LOCAL(0) 73.78.73.84 5 l 26 64 37 0.000 0.000 0.001

NTP ¥µ¡¼¥Ð¡¼Ì¾¤ÎÀèƬ¤Ë * ¤¬É½¼¨¤µ¤ì¤Æ¤¤¤ì¤Ð¡¢ntpd ¤ÏÀµ¾ï¤ËÆ°ºî¤·¤Æ¤¤¤Þ¤¹¡£* ¤ÏƱ´üÃæ¤Î¥µ¡¼¥Ð¡¼¤Ç¤¢¤ë¤³¤È¤òɽ¤·¤Æ¤¤¤Þ¤¹¡£ntpd ¤¬Àµ¾ï¤ËÆ°ºî¤¹¤ë¤È¡¢¼«¥Û¥¹¥È¤Î¥·¥¹¥Æ¥à¥¯¥í¥Ã¥¯¤ò¾¯¤·¤Å¤ÄÊäÀµ¤·¤Þ¤¹¡£¤Ä¤Þ¤ê¡¢ntpd ¤òµ¯Æ°¤·¤Æ¤â¤¹¤°¤Ë¤ÏÀµ¤·¤¤»þ¹ï¤Ë¤Ï¤Ê¤ê¤Þ¤»¤ó¤Î¤ÇÃí°Õ¤·¤Æ¤¯¤À¤µ¤¤¡£

Ʊ´ü¤¬³«»Ï¤µ¤ì¤ë¤Þ¤Ç¤Ë¤Ï»þ´Ö¤¬¤«¤«¤ë¤¿¤á¡¢ntpd ¤Îµ¯Æ°Ä¾¸å¤Ë * ¤ÎÉä¹æ¤Ïɽ¼¨¤µ¤ì¤Þ¤»¤ó¡£¤·¤Ð¤é¤¯·Ð²á¤·¤¿¸å¤Ë ntpq -p ¥³¥Þ¥ó¥É¤ò¼Â¹Ô¤·¡¢³Îǧ¤·¤Æ¤¯¤À¤µ¤¤¡£

¤½¤Î¾¡¢NTP ¥µ¡¼¥Ð¡¼Ì¾¤ÎÁ°¤Ëɽ¼¨¤µ¤ì¤ëÉä¹æ¤Ë¤Ï¡¢°Ê²¼¤¬¤¢¤ê¤Þ¤¹¡£

表 14-4. Éä¹æ¤Î°ÕÌ£

Éä¹æ	°ÕÌ£
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+	»²¾È²Äǽ¤Ê¥µ¡¼¥Ð¡¼¤Ç¤¹¡£
#	µ÷Î¥¤Ï±ó¤¤¤â¤Î¤Î»²¾È²Äǽ¤Ê¥µ¡¼¥Ð¡¼¤Ç¤¹¡£
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x	¸¡ºº¤Ç»²¾ÈÉÔ²Äǽ¤ÈȽÃǤµ¤ì¤¿¥µ¡¼¥Ð¡¼¤Ç¤¹¡£
.	»²¾È¤·¤Æ¤¤¤ë¥µ¡¼¥Ð¡¼¤¬Â¿¤¤¤¿¤á¤Ë³°¤µ¤ì¤¿¥µ¡¼¥Ð¡¼¤Ç¤¹¡£

¤Þ¤¿¡¢ntpq -p ¥³¥Þ¥ó¥É¤¬½ÐÎϤ¹¤ë³ÆÎó¤Î°ÕÌ£¤Ï°Ê²¼¤ÎÄ̤ê¤Ç¤¹¡£

remote

»²¾ÈÀè¤Î NTP ¥µ¡¼¥Ð¡¼¤Î̾Á°¤Ç¤¹¡£

refid

»²¾ÈÀè¤Î NTP ¥µ¡¼¥Ð¡¼¤¬¤É¤³¤«¤é»þ¹ï¤ò¼èÆÀ¤·¤Æ¤¤¤ë¤«¤ò¼¨¤·¤Þ¤¹¡£¥µ¡¼¥Ð¡¼¤Î¥Û¥¹¥È̾¤ä GPS.¤Ê¤É¤¬É½¼¨¤µ¤ì¤Þ¤¹¡£

st

Stratum ¤Î³¬Áؤò¼¨¤·¤Æ¤¤¤Þ¤¹¡£

t

l(local)¡¢u¡Êunicast¡Ë¡¢m¡Êmulticast¡Ë¡¢b¡Êbroadcast¡Ë¤ò¼¨¤·¤Þ¤¹¡£

when

»²¾ÈÀè¤Î NTP ¥µ¡¼¥Ð¡¼¤«¤é¤Î¥Ñ¥±¥Ã¥È¤òºÇ¸å¤Ë¼õ¿®¤·¤Æ¤«¤é¤Î·Ð²á»þ´Ö¤òÉÃñ°Ì¤Çɽ¼¨¤·¤Þ¤¹¡£

poll

¥Ý¡¼¥ê¥ó¥°´Ö³Ö¤òÉÃñ°Ì¤Çɽ¼¨¤·¤Þ¤¹¡£

reach

NTP ¥µ¡¼¥Ð¡¼¤Ø¤ÎÀܳ¤ò»î¤ß¤¿ºÇ¸å¤Î 8 ²óʬ¤Î·ë²Ì¤ò 8 ¿Ê¿ô¤Çɽ¼¨¤·¤Æ¤¤¤Þ¤¹¡£8 ¥Ó¥Ã¥È¤Î¥Ó¥Ã¥ÈÎó¤Ç·ë²Ì¤òÊÝ»ý¤·¤Æ¤ª¤ê¡¢¥µ¡¼¥Ð¡¼Àܳ¤Ç¤­¤¿¾ì¹ç¤Ï¥Ó¥Ã¥È¤¬Î©¤Á¤Þ¤¹¡£¤·¤¿¤¬¤Ã¤ÆÁ´ÉôÀ®¸ù¤·¤¿¾ì¹ç¤Ï¡¢377 ¤Èɽ¼¨¤µ¤ì¤Þ¤¹¡£

delay

»þ¹ïƱ´üÍ×µá¤ËÂФ¹¤ëÊÖÅú»þ´Ö¤ò¥ß¥êÉÃñ°Ì¤Çɽ¼¨¤·¤Þ¤¹¡£

offset

NTP ¥µ¡¼¥Ð¡¼¤È¼«¥Û¥¹¥È¤Î»þ¹ï¤Î¸íº¹¤ò¥ß¥êÉÃñ°Ì¤Çɽ¼¨¤·¤Þ¤¹¡£

jitter

¤Ð¤é¤Ä¤­¤ò¥ß¥êÉÃñ°Ì¤Ç¼¨¤·¤Æ¤¤¤Þ¤¹¡£Ãͤ¬Ä㤤Êý¤¬¡¢Àµ³Î¤Ê»þ¹ïƱ´ü¤¬²Äǽ¤Ç¤¢¤ë¤³¤È¤ò¤¢¤é¤ï¤·¤Þ¤¹¡£