Merge lp:~jpds/serverguide/ntp-update into lp:~ubuntu-core-doc/serverguide/precise

[Jonathan Davies]

Updated server used by ntpdate example to new default in Ubuntu.

[Doug Smythies (dsmythies)]

Both of my 12.04 beta test machines, which are up to date as of earlier today, seems to be using europium.canonical.com ( 91.189.94.4 ) for this. Is that just because it is still in beta?

[Doug Smythies (dsmythies)]

I think I was supposed to set "needs information" before. Setting it now.

review: Needs Information

[Peter Matulis (petermatulis)]

Jonathan, the default install does not have a /etc/ntp.conf (you told me out-of-band that this is where you found '0.ubuntu.pool.ntp.org'). The default install puts the NTP server in /etc/default/ntpdate:

$ sudo grep -ri ntp /etc | grep -i ubuntu
/etc/default/ntpdate:NTPSERVERS="ntp.ubuntu.com"

and is the same as we currently have in the guide.

The file '/etc/ntp.conf' comes from the package 'ntp' which is not even installed by default.

Doug, yes, the above hostname resolves to '91.189.94.4'.

review: Disapprove

[Jonathan Davies (jpds)]

See: ntp-4.2.6.p3+dfsg/debian/ntp.conf in the Debian source package.

[Doug Smythies (dsmythies)]

O.K. My understanding is (not saying it is right, just saying it is my current understanding):

. Without NTP type changes to a default install, the once run of ntpdate during boot will use ntp.ubuntu.com (91.189.94.4, which reverse lookup gives europium.canonical.com)

. If ntpd is installed, then it is unclear as to what NTP server will be used during boot. My system seems to have used 184.105.192.247 ( 247.conarusp.net ).

. If ntpd is removed via "sudo apt-get remove ntp" then the /etc/ntp.conf file stays. It remains unclear as to what NTP server will be used during boot. My system used 216.194.70.2 ( tb.mircx.com ).

. If all ntp files are purged via "sudo apt-get purge ntp" then the /etc/ntp.conf file is gone and during boot the original ntp.ubuntu.com address is used.

Yes, I see the entries in /etc/nto.conf as described in the subsequent sections of this chapter,
i.e. 0.ubuntu.pool.ntp.org. It is not clear to me why they don't seem to be used, but I do have ipv6 disabled on this computer and I do see ipv6 complaints in /var/log/syslog.

I agree that the line of this merge proposal should be left as it was.

Unmerged revisions

45. By Jonathan Davies on 2012-03-15

Updated server used by ntpdate example to new default in Ubuntu.

=== modified file 'serverguide/C/network-config.xml'
--- serverguide/C/network-config.xml	2012-03-09 20:47:35 +0000
+++ serverguide/C/network-config.xml	2012-03-15 13:35:22 +0000
@@ -1049,7 +1049,7 @@
 Ubuntu comes with ntpdate as standard, and will run it once at boot time to set up your time according to Ubuntu's NTP server.
 </para>
 <programlisting>
-ntpdate -s ntp.ubuntu.com
+ntpdate -s 0.ubuntu.pool.ntp.org
 </programlisting>
 </sect2>