Linux/CentOSのntp.conf の変更点

*CentOSのntp.conf [#i13b3712]

**ntpdを動かす場合 [#c81fe192]
ntpdはシステムに影響を与えない為、少しずつ時刻合わせを行います。

初めに起動する場合は、ntpdate コマンドで時刻合わせしてから起動するのをお勧めします。



 # cat /etc/ntp.conf
 
 # Permit time synchronization with our time source, but do not
 # permit the source to query or modify the service on this system.
 restrict default kod nomodify notrap nopeer noquery
 
 # Permit all access over the loopback interface.  This could
 # be tightened as well, but to do so would effect some of
 # the administrative functions.
 restrict 127.0.0.1 
 
 # Hosts on local network are less restricted.
 #restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
 
 # Use public servers from the pool.ntp.org project.
 # Please consider joining the pool (http://www.pool.ntp.org/join.html).
 
 #broadcast 192.168.1.255 key 42                # broadcast server
 #broadcastclient                       # broadcast client
 #broadcast 224.0.1.1 key 42            # multicast server
 #multicastclient 224.0.1.1             # multicast client
 #manycastserver 239.255.254.254                # manycast server
 #manycastclient 239.255.254.254 key 42 # manycast client
 
 # Undisciplined Local Clock. This is a fake driver intended for backup
 # and when no outside source of synchronized time is available. 
 server 127.127.1.0
 fudge  127.127.1.0 stratum 10  
 
 # Drift file.  Put this in a directory which the daemon can write to.
 # No symbolic links allowed, either, since the daemon updates the file
 # by creating a temporary in the same directory and then rename()'ing
 # it to the file.
 driftfile /var/lib/ntp/drift
 
 # Key file containing the keys and key identifiers used when operating
 # with symmetric key cryptography. 
 keys /etc/ntp/keys
 
 # Specify the key identifiers which are trusted.
 #trustedkey 4 8 42
 
 # Specify the key identifier to use with the ntpdc utility.
 #requestkey 8
 
 # Specify the key identifier to use with the ntpq utility.
 #controlkey 8
 server ntp1.jst.mfeed.ad.jp
 restrict ntp1.jst.mfeed.ad.jp mask 255.255.255.255 nomodify notrap noquery
 server ntp2.jst.mfeed.ad.jp
 restrict ntp2.jst.mfeed.ad.jp mask 255.255.255.255 nomodify notrap noquery
 server ntp3.jst.mfeed.ad.jp
 restrict ntp3.jst.mfeed.ad.jp mask 255.255.255.255 nomodify notrap noquery