viernes, 2 de septiembre de 2011

instalar servidor ntp en debian 6 squeeze 5 lenny

Anteriormente en nuestro trabajo teníamos un problema con la sincronización del reloj en nuestras PC todas estaban marcando 5 minutos a 10 de retraso y ponernos de acuerdo todos como en la serie "Parker Lewis-Latino" donde se decía "Sincronicemos relojes" era casi o por no decirlo imposible, para eso existe una herramienta muy util llamada ntp que sincroniza con servidores externos ubicados mayoritariamente en internet

root@localhost# apt-get install ntp ntpdate 
root@localhost# vim /etc/ntp.conf
#/etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
driftfile /var/lib/ntp/ntp.drift

# Enable this if you want statistics to be logged.
#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 about 1000 low-stratum NTP servers.  Your server will
# pick a different set every time it starts up.  Please consider joining the
server 2.pool.ntp.org

# Access control configuration; see /usr/share/doc/ntp-doc/html/accopt.html for
# details.  The web page 
# might also be helpful.
#
# Note that "restrict" applies to both servers and clients, so a configuration
# that might be intended to block requests from certain clients could also end
# up blocking replies from your own upstream servers.

# By default, exchange time with everybody, but don't allow configuration.
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery

# Local users may interrogate the ntp server more closely
#restrict 172.16.3.0 mask 255.255.255.0 notrust 
#restrict 172.16.7.0 mask 255.255.255.0 notrust 
restrict 127.0.0.1
restrict ::1

# Clients from this (example!) subnet have unlimited access, but only if
# cryptographically authenticated.
restrict 172.16.7.0 mask 255.255.255.0 notrust
#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.)
brodcast 172.16.7.255
#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!1
disable auth
broadcastclient
#

Algunos comandos extras para realizar pruebas:

root@localhost# ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*roma.coe.ufrj.b 200.20.186.75    2 u   60   64  277  191.459  -133.22  39.262

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