## page was renamed from UpdateClockInSlackwareWithNTP
= NTP =
NTP is a TCP/IP protocol for synchronizing time over a network. 

== Slackware ==

=== Update clock ===
Run the command as superuser:
{{{#!highlight sh
ntpdate pool.ntp.org
sudo ntpdate pool.ntp.org
}}}

Date and time should be stored in UTC.

Info on slack docs: 
 * [[http://docs.slackware.com/howtos:network-services:ntp]]

Enable the service:
{{{#!highlight sh
chmod 755 /etc/rc.d/rc.ntpd
}}}

Start the service manually:
{{{#!highlight sh
/etc/rc.d/rc.ntpd start
/etc/rc.d/rc.ntpd status
}}}

Add ntp server
 * Edit /etc/ntp.conf
 * add '''server pt.pool.ntp.org'''

{{{#!highlight bash
server  127.127.1.0     # local clock                                           
fudge   127.127.1.0 stratum 10
server pt.pool.ntp.org
driftfile /etc/ntp/drift
# Don't serve time or stats to anyone else by default (more secure)             
restrict default noquery nomodify
# Trust ourselves.  :-)                                                         
restrict 127.0.0.1
}}}

Check the offset in seconds
{{{#!highlight sh
ntpdate -q pt.pool.ntp.org # offset in seconds
ntpq -pn
}}}

== CentOS ==
{{{#!highlight sh
yum install ntp
service ntpd start
chkconfig ntpd on
service ntpd stop
ntpdate pt.pool.ntp.org # sync clock
service ntpd start
ntpdate -q pt.pool.ntp.org
ntpq -pn
}}}

== Ubuntu / Debian ==
{{{#!highlight sh
apt-get install ntp
ntpdate -q pt.pool.ntp.org
service ntp stop
ntpdate  pt.pool.ntp.org
service ntp start
ntpq -pn
#
apt install -y ntp ntpsec-ntpdate ntpdate
/sbin/ntpdate pt.pool.ntp.org
/sbin/service ntp stop
timedatectl set-timezone Europe/Lisbon
/sbin/service ntp start
}}}

== FreeBSD 9.0 ==
Run the command:
{{{#!highlight sh
ntpdate pool.ntp.org
}}}

Check the UTC date:
{{{#!highlight sh
date -u
}}}

Edit the file '''/etc/rc.conf''':
{{{#!highlight sh
ntpd_enabled="YES"
}}}

Start and check the NTPD service status:
{{{#!highlight sh
/etc/rc.d/ntpd start
/etc/rc.d/ntpd status
}}}

== Sync summer time Slackware ==
{{{#!highlight sh
timeconfig # set HW clock to UTC
/etc/rc.d/rc.ntpd stop
ntpdate pt.pool.ntp.org
/etc/rc.d/rc.ntpd start
}}}

== Windows ==
 * net start w32time
 * w32tm /config /manualpeerlist:pt.pool.ntp.org 
 * w32tm /resync /force