CentOS time problem

Stressik · 03-29-2010, 01:36 AM

Hello. I have installed CentOS on a VM2007 (from M$).
Version 2.6.18-164.11.1.el5 (Red Hat 4.1.2-46).
On the instance is installed Asterisk, whole packet is from the AsteriskNOW! CD.
Unfortunately I have problem with time - the time simply goes to fast (or sometimes to slow). I have maked a

Quote:

default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.11.1.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-164.11.1.el5 ro root=/dev/VolGroup00/LogVol00 clock=pit
initrd /initrd-2.6.18-164.11.1.el5.img

but that didn't help.
I have also tried a ntpdate together with cron, and also failure. Cron works, the log shows, that the script with ntpdate is running but I see no result - I still have a problem with the time.
How can I solve this?
Thanks.

irishbitte · 03-29-2010, 02:22 AM

The problem is the software you are using, this issue is resolved in VirtualBox using Guest Additions, and in VMWare using tools. AFAIK, MS does not support RedHat or CentOS, therefore, there is no guest additions for VM2007. However, I may be wrong, it is worth checking out microsofts support pages.

Just a note on the issue, it is caused by the abstraction layer presented to the guest OS, where the clock cycles of the CPU are presented inaccurately. What you probably notice is that at system start up, the time is correct, since the VM will sync with the host hardware clock at boottime, but then falls out of sync rapidly. The solution that I refer to above essentially creates a link between the host and guest clocks, but as you can imagine, this can only be initiated from the guest OS, not the other way around.

irishbitte · 03-29-2010, 02:24 AM

Well, what do ya know, take a look at this: http://blogs.msdn.com/virtual_pc_guy...available.aspx, it might just solve your problem.

Stressik · 03-29-2010, 05:23 AM

I have tried to install AsteriskNOW! on a Sun VirtualBox. Installation goes succesfull, but I can not install Guest Addons:

Quote:

sudo sh /mnt/cdrom/VBoxLinuxAdditions-x86.run
Verifying archive integrity... All good.
Uncompressing VirtualBox 3.1.6 Guest Additions for Linux........
VirtualBox Guest Additions installer
Removing installed version of VirtualBox Guest Additions...
Building the VirtualBox Guest Additions kernel modules [FAILED]
(Your system does not seem to be set up to build kernel modules.
Look at /var/log/vboxadd-install.log to find out what went wrong)
Installing the Window System drivers [FAILED]
(Could not find the X.Org or XFree86 Window System.)

I have installed kernel-devel, kernel-headers, dkms gcc, rebooted and still nothing... Is Guest Addons installing required to properly count time?

Edit:
For those with this same issue:

Quote:

yum install kernel sources
yum install kernel-devel
yum install gcc
ln -s /usr/src/kernels/2.6.18-92.1.18.el5-i686 /usr/src/linux
sh VBoxLinuxAdditions-x86.run

Question1
But the question is - what else should I do to make the clock work correct with VirtualBox?

Question2
Why the hell VirtualBOX is so slow? I have running VB on xeon 3050 with sbs2k3 and 2GB of RAM - when I connect to the IVR i hear voice like Zeus

- very slow and with flicks. All the CLI also works very slow. VM2007 works fine...
Thanks!