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[Xen-API] RE: XCP / xenAPI shows no vms but vm is still running

To: 'Chonduy Nguyen' <chonduy9@xxxxxxxxx>
Subject: [Xen-API] RE: XCP / xenAPI shows no vms but vm is still running
From: Dave Scott <Dave.Scott@xxxxxxxxxxxxx>
Date: Fri, 5 Mar 2010 23:15:26 +0000
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Thread-topic: XCP / xenAPI shows no vms but vm is still running



Xapi considers a VM to be “resident-on” one host at a time. It sounds like you’re interested in which *domains* are running on the host (each domain has the same UUID as the corresponding VM). Have a look at the command “list_domains”. If some domains need cleaned up it’s possible to run commands like “/opt/xensource/debug/destroy_domain –domid <domid>”






From: Chonduy Nguyen [mailto:chonduy9@xxxxxxxxx]
Sent: 05 March 2010 19:41
To: Dave Scott
Cc: xen-api@xxxxxxxxxxxxxxxxxxx; Stephen Spector
Subject: Re: XCP / xenAPI shows no vms but vm is still running


Hi Dave,

Since the current XCP didnot provide Fault Tolerant and HA yet, we tried to write a simple monitoring where we ping the node and check
if this node is unreachable - for whatever reason - could be network connection down or could be physical hardware etc...

we will disconnect this problem  node  out of XCP network by filter traffic from this node to storage network and other nodes -using iptables filtering and we want to quickly move Vms to start at other mahines - Therefore,we need to use reset-power-state

However, since we keep monitoring this node - the node could be back up again. That time we want to find a way to check if VMs running - but XCP
showed that VMs not there - but actually VMs still there.

Can you please suggest a way to find out if VMs running on machine or not ? XCP will fail to show this - I am wondering is there anyway we can detect
VMs running on OS?

Please let me know



From: Dave Scott <Dave.Scott@xxxxxxxxxxxxx>
To: Chonduy Nguyen <chonduy9@xxxxxxxxx>; "xen-api@xxxxxxxxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxxxxxxxx>
Cc: Stephen Spector <stephen.spector@xxxxxxxxxx>
Sent: Fri, March 5, 2010 4:09:47 AM
Subject: RE: XCP / xenAPI shows no vms but vm is still running



You should only use ‘reset-power-state’ on VMs which have failed e.g. if the host has failed. If the VMs are still running then you shouldn’t do this – if you start a VM twice then there is a high chance of disk corruption.





From: Chonduy Nguyen [mailto:chonduy9@xxxxxxxxx]
Sent: 05 March 2010 01:18
To: xen-api@xxxxxxxxxxxxxxxxxxx
Cc: Dave Scott; Stephen Spector
Subject: XCP / xenAPI shows no vms but vm is still running



I tried the case when the node - said "P" is unreachable by interface down - so, we restart Vms of that machine to another machine by
doing reset-power-state first and call vms to start at other machine said node "A"

However when the problem node "P"  is up again - xenAPI shows that there is no Vm running on it-   Which is wrong, Vms should be running.
I tested this by stop the vm on "A"  to start that vm on the "P" - "P" complains that

[root@quindecim ~]# xe vm-start vm=ken-debian-vm-2 on=quindecim
The server failed to handle your request, due to an internal error.  The given message may give details useful for debugging the problem.
message: Failure("The VDI 57a82bd4-a889-42ff-94d3-479a2618f2ec is already attached in RW mode; it can't be attached in RO mode!")

After I reboot the node, vm can start.  So, is there any way I can detect that VMs are currently running on the "P" problem machine?

after the Vms relocated to other machine, info from XenAPI showed that that machine has no VMs ( which is incorrect!)





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