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https://www.7key.jp/ntp_set.html#a_01
# rpm -qa | grep ntp
ntp-4.1.2-4
と表示されればインストール済み(環境はRedhat ES/以下同)。
インストールされていなければ下記コマンドにてインストール(CD2)。
# rpm -ivh /mnt/cdrom/RedHat/RPMS/ntp-4.1.2-4.i386.rpm
https://www.7key.jp/ntp_set.html#a_01
# Prohibit general access to this service. restrict default ignore # デフォルトで全クライアントからのアクセスを禁止 # 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 nomodify # 自身からのアクセスを有効 # -- CLIENT NETWORK ------- # Permit systems on this network to synchronize with this # time service. Do not permit those systems to modify the # configuration of this service. Also, do not use those # systems as peers for synchronization. restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap # ローカルネットアドレスからのアクセスを有効 restrict 192.168.1.1 mask 255.255.255.0 nomodify notrap noquery # 上位NTPサーバ1からのアクセスを有効 restrict 192.168.1.2 mask 255.255.255.0 nomodify notrap noquery # 上位NTPサーバ2からのアクセスを有効 # --- OUR TIMESERVERS ----- # or remove the default restrict line # Permit time synchronization with our time source, but do not # permit the source to query or modify the service on this system. # restrict mytrustedtimeserverip mask 255.255.255.255 nomodify notrap noquery # server mytrustedtimeserverip server 192.168.1.1 # 上位NTPサーバ1に192.168.1.1を指定する server 192.168.1.2 # 上位NTPサーバ1に192.168.1.2を指定する # --- NTP MULTICASTCLIENT --- #multicastclient # listen on default 224.0.1.1 # restrict 224.0.1.1 mask 255.255.255.255 notrust nomodify notrap # restrict 192.168.1.0 mask 255.255.255.0 notrust nomodify notrap # --- GENERAL CONFIGURATION --- # # Undisciplined Local Clock. This is a fake driver intended for backup # and when no outside source of synchronized time is available. The # default stratum is usually 3, but in this case we elect to use stratum # 0. Since the server line does not have the prefer keyword, this driver # is never used for synchronization, unless no other other # synchronization source is available. In case the local host is # controlled by some external source, such as an external oscillator or # another protocol, the prefer keyword would cause the local host to # disregard all other synchronization sources, unless the kernel # modifications are in use and declare an unsynchronized condition. # #server 127.127.1.0 #local clock #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 broadcastdelay 0.008 # # Authentication delay. If you use, or plan to use someday, the # authentication facility you should make the programs in the auth_stuff # directory and figure out what this number should be on your machine. # authenticate yes # # Keys file. If you want to diddle your server at run time, make a # keys file (mode 600 for sure) and define the key number to be # used for making requests. # # PLEASE DO NOT USE THE DEFAULT VALUES HERE. Pick your own, or remote # systems might be able to reset your clock at will. Note also that # ntpd is started with a -A flag, disabling authentication, that # will have to be removed as well. # keys /etc/ntp/keys
https://www.7key.jp/ntp_set.html#a_01
#chkconfig --level 35 ntpd on
https://www.7key.jp/ntp_set.html#a_01
# service ntpd start
https://www.7key.jp/ntp_set.html#a_01
#ntpq -p
remote refid st t when poll reach delay offset jitter ============================================================================== +piyo1.sample.co 192.168.1.1 3 u 104 256 377 22.780 9.707 1.459 *piyo2.sample.co 192.168.1.2 3 u 50 256 377 22.147 11.603 79.666
0.0.0.0
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