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xen VM going down for no reason
| Posted by sharmaine1111, 05-18-2010, 01:34 PM |
| I have a dedicated server and partitioned one VM under that. The VM sometimes (at random times) is just going down for no apparent reason. I contacted my host and they told me that it is not a hardware issue because the server is up, it's only the VM that is going down
They said it's about my CSF but I can't find anything unique in my CSF configuration. I have a VPS with another company (running in OpenVZ) and i have the same csf config and my vps with other company is not going down
I researched and Ive seen the same problems from other people running Citrix Xen. Apparently, according to them the VM freezes up and cannot be rebooted through xen desktop. I experienced it a while ago when i was trying to reboot the VM and the server itself from xen desktop and it wasn't allowing me to reboot it. After so many tries, it finally rebooted.
I don't know if that is my problem (VM hanging up). Is there a way for me to pinpoint and identify the cause of this problem? How much memory should I give citrix xen server to execute it functions? Currently around 600MB is allotted to xen and the rest are allotted to the VM.
Using
CENTOS 5.5 x86_64 xen enterprise
xen 5.5 update 1
kernel 2.6.18-164.11.1.el5xen
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| Posted by MikeTrike, 05-18-2010, 02:30 PM |
| I've had a CentOS 5.4 VM under Citrix XenServer freeze every once and a while. I was also told it was related to CSF as well so I'm not sure exactly what the issue is.
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| Posted by Russ Foster, 05-18-2010, 02:31 PM |
| Can you get onto the Xen VM console when it hangs?
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| Posted by PCS-Chris, 05-18-2010, 02:32 PM |
| By any chance are you loading all of the RBL's which CSF supports?
Might be a case of too many iptables entries making it crash, although there is obviously no limit as such like you have in VZ.
When it "crashes" can you console in at all, or is it completely locked up?
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| Posted by sharmaine1111, 05-18-2010, 09:45 PM |
| When the VM hangs up, I can console to the server but not to the VM. The VM just freezes up and I can't do anything. Even if I try to reboot the entire server it won't allow me. I read that if there are processes pending in the VMs, citrix xen will not allow you to reboot which probably explains it
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| Posted by xerophyte, 05-18-2010, 11:30 PM |
| how many vcpus do you have configured
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| Posted by sharmaine1111, 05-18-2010, 11:45 PM |
| I am using hyper threading core i5-650 so it has 2 cores * 2 = 4
I set up 4 vcpus
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| Posted by kprojects, 12-09-2011, 12:48 PM |
| Did you ever figure this out? I've run across the same thing with csf/lfd on xenserver CentOS VMs..
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