Xntpd
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xntpd - Network Time Protocol Daemon
Sun systems use a combination of an oscillator and a 64-bit counter to keep track of time. A specific number of oscillations cause an interrupt that, if processed, causes the counter to increment. A SPARC CPU generates by default 100 interrupts per second, they must be processed by the kernel. However, if the system has a high load or higher priority tasks, not all interrupts get processed; so the clock will fall slightly behind... A very common way to keep all systems synchronized is the "Network Time Protocol".
Solaris xntpd is a complete implementation of the Network Time Protocol (NTP) version 3 standard, as defined by RFC 1305.
Server Configuration
You will find a predefined startup script at /etc/rc2.d/S74xntpd, which starts the xntpd process in either the client or the server mode, depending on the contents of the /etc/inet/ntp.conf file.
Local NTP
edit your /etc/inet/ntp.conf:
server 127.127.1.0 prefer broadcast 224.0.1.1 ttl 4 enable auth monitor driftfile /var/ntp/ntp.drift statsdir /var/ntp/ntpstats/ filegen peerstats file peerstats type day enable filegen loopstats file loopstats type day enable filegen clockstats file clockstats type day enable keys /etc/inet/ntp.keys trustedkey 0 requestkey 0 controlkey 0
creat the ntp.drift file, as specified in the ntp.conf, and start the ntp-server
# touch /var/ntp/ntp.drift # /etc/init.d/xntpd start
External NTP Reference Servers
edit your /etc/inet/ntp.conf:
server time-server-1 server time-server-2 server time-server-3 broadcast 224.0.1.1 ttl 4 enable auth monitor driftfile /var/ntp/ntp.drift statsdir /var/ntp/ntpstats/ filegen peerstats file peerstats type day enable filegen loopstats file loopstats type day enable filegen clockstats file clockstats type day enable keys /etc/inet/ntp.keys trustedkey 0 requestkey 0 controlkey 0
By default, all NTP messages are sent to the syslog utility.
Determining NTP Peers
you can use the ntpq utility to identify NTP peers on the network:
# ntpq
ntpq> peers
remote refid st t when poll reach delay offset disp
==============================================================================
*LOCAL(0) LOCAL(0) 3 l 51 64 377 0.00 0.000 10.01
NTP.MCAST.NET 0.0.0.0 16 - - 64 0 0.00 0.000 16000.0
ntpq> exit
Client Configuration
edit your /etc/inet/ntp.conf and add:
multicastclient 224.0.1.1
start your xntpd:
# /etc/init.d/xntpd start
32 bit vs. 64 bit counter
The 32-bit time counter would reach its limit in the year 2038. The time counter was started at 0 at midnight, January 1, 1970. The 64-bit counter will reach its limit in about 290 million years. That should be enough, even for a sun-server ;)
