Ntp

NTP is Network Time Protocol. It exists on both Solaris and Linux but is not started by default so it must be started using following procedure:

Solaris

1. login as 'root'

2. Create file /etc/inet/ntp.conf, or copy from another Solaris machine:

 # peer host_address [ key # ] [ version # ] [ minpoll interval ] [prefer]
 # server host_address [ key # ] [ version # ] [ minpoll interval ] [prefer]
 # broadcast host_address [ key # ] [ version # ] [ minpoll interval ]
 # driftfile filename
 # broadcast yes|no
 # broadcastdelay seconds
 # authenticate yes|no
 # authdelay seconds
 # keys filename
 # trustedkey # [ # ... ]
 # controlkey #
 # restrict address [ mask numeric_mask ] [ flag ] [ ... ]
 # statsdir /directory/[ prefix ]
 # statistics names
 # filegen name [ file filename ] [ type typename ] [ link|nolink ] [enable|disable ]
 # enabled/disabled
 # link/nolink
 # keyno  type  key
 #
 ####################
 #
 # JLAB time servers
 server ntp1.jlab.org  version 3  prefer  # stratum 2, Ver 3
 server ntp2.jlab.org  version 3          # stratum 2, Ver 3
 #
 #
 driftfile /etc/inet/ntp.drift

3. Start the ntp daemon:

 svcadm enable network/ntp

4. Check if it is running:

 svcs | grep ntp
   online         16:29:30 svc:/network/ntp:default

5. Make query to make sure everything is Ok:

 ntpq -p
        remote           refid      st t when poll reach   delay   offset    disp
   ==============================================================================
   *ns1.jlab.org    time.nist.gov    2 u   27   64   77     0.46   -1.440  387.54
   +ccs1.jlab.org   time.nist.gov    2 u   27   64   77     0.43    1.798  386.89

Linux

You can use /usr/bin/system-config-date if available, in that case check /etc/ntp.conf file to see if everything is correct (see below). To do it manually:

1. Login as 'root'

2. Modify file /etc/ntp.conf commenting out lines

 ##server 0.pool.ntp.org
 ##server 1.pool.ntp.org
 ##server 2.pool.ntp.org

and adding lines

 server ntp1.jlab.org
 server ntp2.jlab.org

or copy file from another Linux machine.

3. Start daemon:

 /etc/init.d/ntpd start
   Starting ntpd:                                             [  OK  ]

4. Check if it is running:

 /etc/init.d/ntpd status
   ntpd (pid 15598) is running...

5. Make query to make sure everything is Ok:

 ntpq -p
        remote           refid      st t when poll reach   delay   offset  jitter
   ==============================================================================
   ns1.jlab.org    192.43.244.18    2 u   57   64    7    0.245  35139.8   1.521
   ccs1.jlab.org   192.43.244.18    2 u   50   64    7    0.522  35138.7   1.351

6. To start service at next boot do following:

 ###chkconfig --add ntpd (normally linux has it already)
 chkconfig --level 3 ntpd on
 chkconfig --level 4 ntpd on
 chkconfig --level 5 ntpd on
 chkconfig --list ntpd
   ntpd            0:off   1:off   2:off   3:on   4:on   5:on    6:off

If 'chkconfig' tool does not exist, make symbolic links manually, for example:

 /etc/rc0.d/K74ntpd -> ../init.d/ntpd
 /etc/rc1.d/K74ntpd -> ../init.d/ntpd
 /etc/rc2.d/K74ntpd -> ../init.d/ntpd
 /etc/rc3.d/K74ntpd -> ../init.d/ntpd
 /etc/rc3.d/S58ntpd -> ../init.d/ntpd
 /etc/rc4.d/K74ntpd -> ../init.d/ntpd
 /etc/rc4.d/S58ntpd -> ../init.d/ntpd
 /etc/rc5.d/K74ntpd -> ../init.d/ntpd
 /etc/rc5.d/S58ntpd -> ../init.d/ntpd
 /etc/rc6.d/K74ntpd -> ../init.d/ntpd

NOTES:

 /etc/sysconfig/clock sets whether the hardware clock is stored as UTC or local time.
 Symlink /etc/localtime to /usr/share/zoneinfo/... to set your timezone.
 Run ``date MMDDhhmm to set the current system date/time.
 Type ``/sbin/hwclock --systohc [--utc] to set the hardware clock.