[Cialug] xen and ntp on centos

[Barry Von Ahsen]

yes, this again :)

every document in the world says run ntpd on dom0, and domU will 
automatically update, except it doesn't on centos.  in the last 24 hours 
(when I manually fixed it), domU is nearly 40 minutes fast.

several sources said to check /proc/sys/xen/independent_wallclock on the 
guest, but I don't have a /proc/sys/xen there, am I missing a package?


simul-date:
[barry at xen ~]# date
Thu Aug  4 15:25:45 CDT 2011
[barry at domU ~]$ date
Thu Aug  4 16:04:40 CDT 2011


dom0:
[barry at xen ~]$ cat /etc/issue
CentOS release 5.6 (Final)
Kernel \r on an \m

[barry at xen ~]$ uname -a
Linux 2.6.18-238.19.1.el5xen #1 SMP Fri Jul 15 08:16:59 EDT 2011 x86_64 
x86_64 x86_64 GNU/Linux

[barry at xen ~]$ cat /proc/sys/xen/independent_wallclock
0

[barry at xen ~]# grep ntpd /var/log/messages
(snip)
Aug  3 11:04:27 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
Aug  3 12:11:07 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2
Aug  4 03:50:07 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
Aug  4 07:44:59 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2
Aug  4 09:49:03 xen ntpd[4008]: synchronized to 208.94.240.2, stratum 2
Aug  4 14:35:21 xen ntpd[4008]: synchronized to 209.114.111.1, stratum 2

[barry at xen ~]# rpm -qa | grep xen
xen-libs-3.0.3-120.el5_6.3
kernel-xen-2.6.18-238.19.1.el5
kernel-xen-2.6.18-238.9.1.el5
xen-3.0.3-120.el5_6.3



domU:
[barry at domU ~]$ cat /etc/issue
CentOS release 5.6 (Final)
Kernel \r on an \m

[barry at domU ~]$ uname -a
Linux 2.6.18-238.19.1.el5 #1 SMP Fri Jul 15 07:31:24 EDT 2011 x86_64 
x86_64 x86_64 GNU/Linux

[barry at domU ~]$ cat /proc/sys/xen/independent_wallclock
cat: /proc/sys/xen/independent_wallclock: No such file or directory

[barry at domU ~]$ rpm -qa | grep xen
(nothing)