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2003/07/09(20:48) from 61.84.234.185 | |
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[Redhat 7.3] NTP(Network Time Protocol) ¼³Á¤ |
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RedHat 7.3ÀÇ °æ¿ì ¼³Ä¡½Ã NTP (Network Time Protocol)¸¦ ±âº»ÀûÀ¸·Î ¼³Ä¡ÇÏ°Ô µÇÁö¸¸, Custom ¹æ½ÄÀ¸·Î ¼³Ä¡ÇÏ°Ô µÇ¸é, NTP °¡ ºüÁö´Â ¼ö°¡ ÀÖ´Ù. NTP °ü·Ã ÇÁ·Î±×·¥ÀÇ ¼³Ä¡ À¯¹«´Â ntp.conf ÆÄÀÏÀÌ ÀÖ´ÂÁö·Î È®ÀÎÇÒ ¼ö ÀÖ´Ù. ¶Ç´Â # rpm -q ntp ·Îµµ È®ÀÎÀÌ °¡´ÉÇÏ´Ù. ¸¸ÀÏ ÀÌ ÆÄÀÏÀÌ ¾ø ´Ù¸é ´ÙÀ½¿¡ ÇØ´çÇÏ´Â ÆÄÀϵéÀ» ¼³Ä¡ÇØ¾ß ÇÑ´Ù. 1. root ±ÇÇÑÀ¸·Î ½Ã½ºÅÛÀÇ ½Ã°¢À» ÇöÀç ½Ã°¢À¸·Î ¼³Á¤ÇÑ´Ù. °è¼ÓµÇ´Â ¸ðµç ¼³Ä¡ °úÁ¤Àº ¸ðµÎ root ±ÇÇÑÀ¸·Î ½ÇÇàÇÑ´Ù. 2. clock -w ¸í·ÉÀ» ÀÌ¿ëÇÏ¿© CMOS RTC (Real Time Clock) À» ÇöÀç½Ã°¢À¸·Î º¯°æÇÕ´Ï´Ù. 3. Redhat 7.3 #1 CD¸¦ cdrom¿¡ ³Ö°í RedHat -> RPMS µð·ºÅ丮·Î °©´Ï´Ù. # rpm -i ntp-4.1.1-1.i386.rpm Redhat CD¸¦ °¡Áö°í ÀÖÁö ¾ÊÀ¸¸é, ntp-4.1.1-1.i386.rpm¸¦ ftp.redhat.com¿¡ anonymous·Î Á¢¼ÓÀ» Çؼ Redhat 7.3¿ë rpm À» ´Ù¿î¹ÞÀ»¼ö ÀÖ´Ù. ¸¸¾à¿¡ ntp¸¦ ¼³Ä¡ÇÏ¸é¼ libcap-1.10-8.i386.rpm¸¦ ¿ä±¸ÇÑ´Ù¸é ÀÌ ÆÄÀϵµ ´Ù¿îÀ» ¹Þ¾î¼ ¼³Ä¡¸¦ ÇØÁà¾ß ÇÑ´Ù. 4. /etc/ntp.conf ´ë½Å¿¡ ´ÙÀ½°ú °°ÀÌ ÇÑ ÁÙÂ¥¸® ÆÄÀÏÀ» ¸¸µì´Ï´Ù. # mv /etc/ntp.conf /etc/ntp.conf.org # echo "server ntp.ewha.net" > /etc/ntp.conf ntp.conf ÆÄÀÏÀ» ÀúÀåÇÑ ÈÄ Å¸ÀÓ ¼¹ö¿Í ½Ã°£À» ¸ÂÃß´Â ÇÁ·Î±×·¥ÀÎ ntpd µ¥¸óÀ» ½ÇÇàÇÑ´Ù. # /etc/rc.d/init.d/ntpd start 5. ºÎÆÃÇÒ¶§ ntpd µ¥¸ó ½ÇÇàÇϱâ # ntsysv ¿¡¼ ntpd (Redhat 7.x ÀÎ °æ¿ì ntpd) ¸¦ ¼±ÅÃÇØ ½Ã½ºÅÛÀ» ÀçºÎÆÃÀ» Çصµ ÀÚµ¿À¸·Î ÀÌ ÇÁ·Î±×·¥À» ½ÇÇàÇÏ°Ô ÇÑ´Ù. ÇÏ·ç¿¡ Çѹø¾¿ ½Ã½ºÅÛÀÇ ½Ã°¢°ú RTC (Real Time Clock) ÀÇ ½Ã°¢À» ÀÏÄ¡½ÃÄÑ ÁÖ´Â °ÍÀÌ ÁÁ´Ù. ÀÌ°ÍÀº root ±ÇÇÑÀ¸·Î /etc/cron.daily ¸¦ ÀÌ¿ëÇÏ¸é µË´Ï´Ù. ¾Æ·¡¿Í °°Àº ³»¿ëÀ» Æ÷ÇÔÇÏ´Â sys_clocks ÆÄÀÏÀ» ¸¸µé¾î /etc/cron.daily Æú´õ¿¡ ³Ö¾îµÎ¸é µË´Ï´Ù. sys_clocks ÀÇ Æ۹̼ÇÀº 755 ·Î ÇÕ´Ï´Ù. # vi sys_clocks #Assume ntp is running, so sync the CMOS RTC to OS system #clock /sbin/clock -w # chmod 755 sys_clocks ÀÏ´Ü ntpd ¸¦ ½ÇÇàÇÑ Èijª ȤÀº ½Ã½ºÅÛ Àç½Ãµ¿ ÈÄ ¾à 5ºÐ Á¤µµ°¡ Áö³ ÈÄ¿¡´Â ntpq -p ¶ó´Â ¸í·É¾î·Î ÇöÀç NTP ¼¹ö·ÎºÎÅÍ Á¦´ë·Î ½Ã°¢¿¡ °üÇÑ Á¤º¸¸¦ ¹Þ°í ÀÖ´ÂÁö¸¦ È®ÀÎÇÒ ¼ö ÀÖ½À´Ï´Ù. ntpq -p ¸í·ÉÀº ¹Ýµå½Ã root±ÇÇÑÀ¸·Î ½ÇÇàÇØ¾ß ÇÕ´Ï´Ù. 6. ³» ¸®´ª½º¼¹ö¿¡¼ ½ÇÇàÇÑ ¸ð½À (Á¦´ë·Î µ¿ÀÛÇÏ°í ÀÖÀ½) [root@www /etc/rc.d/init.d]# ntpq -p remote refid st t when poll reach delay offset jitter ============================================================================== 211.39.143.103 ntp1.cs.pusan.a 2 u 47 64 7 4.929 4.109 1.606 7. secondary NTP ¼¹ö primary NTP ¼¹ö°¡ Á×¾úÀ»°æ¿ì¿¡ ´ëºñÇؼ ¿©·¯°³ÀÇ NTP ¼¹ö¸¦ µî·ÏÇØÁִ°͵µ ÁÁÀº ¹æ¹ýÀÌ´Ù. # vi /etc/ntp.conf server gps.bora.net server ntp1.cs.pusan.ac.kr server time.nuri.net server time.bora.net server time.kriss.re.kr server clock.nc.fukuoka-u.ac.jp server clock.cuhk.edu.hk server clock.uregina.ca server clepsydra.dec.com server clock.isc.org server montpelier.ilan.caltech.edu server ntp-cup.extermal.hp.com server timekeeper.isi.edu server usno.pa-x.dec.com server navobs1.usnogps.navy.mil server navobs2.usnogps.navy.mil server tick.usno.navy.mil server ntp.mel.nml.csiro.au server ntp.nml.csiro.au server ntp.per.nml.csiro.au server time.nist.gov server time-nw.nist.gov server nist1.datum.com server nist1-sj.glassey.com server nist1.aol-ca.truetime.com server utcnist.colorado.edu server time-a.nist.gov server time-b.nist.gov server time-a.timefreq.bldrdoc.gov server time-b.timefreq.bldrdoc.gov server time-c.timefreq.bldrdoc.gov reach, delay, disp ´Â °¢°¢ reachability, delay, dispersion À» ³ªÅ¸³½´Ù. reach °ªÀº ŸÀÓ¼¹ö¿¡ ¿ÏÀüÈ÷ Á¢¼ÓÇϱâ À§ÇØ ÆÈÁø¼ö·Î 377 À̾î¾ß ÇÑ´Ù. ¶ÇÇÑ delay °ªÀº ¾çÀÇ ¼ö¿©¾ß ÇÏ¸ç °¡´ÉÇÑ ÀÛÀº °ªÀ̾î¾ß ÇÑ´Ù. disp °ªÀº ¼¹öÁß Àû¾îµµ Çϳª´Â 1000 ms(1ÃÊ) ¹Ì¸¸À̾î¾ß ÇÑ´Ù. ±×¸®°í ¼¹öÁß Àû¾îµµ ¹Ýµå½Ã Çϳª´Â ¼¹ö¸í ¾Õ¿¡ * Ç¥½Ã°¡ µÇ¾îÀÖ¾î¾ß ÇÑ´Ù. |