build:ntp
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build:ntp [2005/09/10 14:28] 206.197.251.57 Add the current ntp.conf to page -- Carl |
build:ntp [2010/07/21 20:41] SLUUG Administration |
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| - | ===== NTP ===== | + | ====== NTP ====== |
| - | We are running NTP to keep the clock accurate. It is pointed at multiple instances of us.pool.ntp.org and is configured in /etc/ntp.conf. We are not providing time service to any other machines (this is limited via the "restrict" keyword in ntp.conf). | + | We are running NTP to keep the clock accurate. |
| - | # apt-get install ntp ntp-doc ntp-simple ntpdate | + | ===== Installation ===== |
| + | Debian | ||
| + | <code debian> | ||
| + | apt-get install ntp ntp-doc ntp-simple ntpdate | ||
| + | </code> | ||
| - | ==== /etc/ntp.conf | + | CentOS |
| - | ==== | + | <code centos> |
| + | yum install ntp | ||
| + | </code> | ||
| - | # /etc/ntp.conf, configuration for ntpd | + | ===== Configuration ===== |
| - | + | We are using the default configuration that Debian/CentOS ships with. This is primarily a client configuration -- we allow other systems only to get the current time; they may not query any further information. (This is limited via the ''restrict'' keyword.) The daemon runs primarily in order to sync the system's time with the upstream NTP servers. | |
| - | # ntpd will use syslog() if logfile is not defined | + | |
| - | #logfile /var/log/ntpd | + | The configuration file points to multiple upstream NTP servers within [debian/centos].pool.ntp.org. |
| - | + | ||
| - | driftfile /var/lib/ntp/ntp.drift | + | ===== TODO ===== |
| - | statsdir /var/log/ntpstats/ | + | |
| - | + | ||
| - | statistics loopstats peerstats clockstats | + | |
| - | filegen loopstats file loopstats type day enable | + | |
| - | filegen peerstats file peerstats type day enable | + | |
| - | filegen clockstats file clockstats type day enable | + | |
| - | + | ||
| - | + | ||
| - | # You do need to talk to an NTP server or two (or three). | + | |
| - | #server ntp.your-provider.example | + | |
| - | + | ||
| - | # pool.ntp.org maps to more than 100 low-stratum NTP servers. | + | |
| - | # Your server will pick a different set every time it starts up. | + | |
| - | # *** Please consider joining the pool! *** | + | |
| - | # *** <http://www.pool.ntp.org/#join> *** | + | |
| - | server pool.ntp.org | + | |
| - | #server pool.ntp.org | + | |
| - | ## uncomment for extra reliability | + | |
| - | + | ||
| - | # ... and use the local system clock as a reference if all else fails | + | |
| - | # NOTE: in a local network, set the local stratum of *one* stable server | + | |
| - | # to 10; otherwise your clocks will drift apart if you lose connectivity. | + | |
| - | server 127.127.1.0 | + | |
| - | fudge 127.127.1.0 stratum 13 | + | |
| - | + | ||
| - | # By default, exchange time with everybody, but don't allow configuration. | + | |
| - | # See /usr/share/doc/ntp-doc/html/accopt.html for details. | + | |
| - | # *** Please consider joining the pool! *** | + | |
| - | # *** <http://www.pool.ntp.org/#join> *** | + | |
| - | server pool.ntp.org | + | |
| - | #server pool.ntp.org | + | |
| - | ## uncomment for extra reliability | + | |
| - | + | ||
| - | # ... and use the local system clock as a reference if all else fails | + | |
| - | # NOTE: in a local network, set the local stratum of *one* stable server | + | |
| - | # to 10; otherwise your clocks will drift apart if you lose connectivity. | + | |
| - | server 127.127.1.0 | + | |
| - | fudge 127.127.1.0 stratum 13 | + | |
| - | + | ||
| - | # By default, exchange time with everybody, but don't allow configuration. | + | |
| - | # See /usr/share/doc/ntp-doc/html/accopt.html for details. | + | |
| - | restrict default kod notrap nomodify nopeer noquery | + | |
| - | + | ||
| - | # Local users may interrogate the ntp server more closely. | + | |
| - | restrict 127.0.0.1 nomodify | + | |
| - | + | ||
| - | # Clients from this (example!) subnet have unlimited access, | + | |
| - | # but only if cryptographically authenticated | + | |
| - | #restrict 192.168.123.0 mask 255.255.255.0 notrust | + | |
| - | + | ||
| - | # If you want to provide time to your local subnet, change the next line. | + | |
| - | # (Again, the address is an example only.) | + | |
| - | #broadcast 192.168.123.255 | + | |
| - | + | ||
| - | # If you want to listen to time broadcasts on your local subnet, | + | |
| - | # de-comment the next lines. Please do this only if you trust everybody | + | |
| - | # on the network! | + | |
| - | #disable auth | + | |
| - | #broadcastclient | + | |
build/ntp.txt · Last modified: 2010/07/21 20:41 by SLUUG Administration
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