Auto-start of VM Guest Machines when OVM host starts.

Greeting Experts,
I need to ask workaround for auto-start of guest virtual machines whenever OVM host starts.
Please advice.
Thanks & Regards,
Sharjeel Mojib

There is no supported way of doing this in OVMM. If you'd really wanted to take that route, there is, of course a way to achieve this.
First, you will have to get a hold on the ID of your guest, that you want to start. You'll get that from OVMM
You could then use the rc.local script to have Xen start your guest at startup by adding this to the end of rc.local
/usr/sbin/xm create [Path to Repository]/Guest_ID/vm.cfg
This should start up your guest, assuming that the storage repository is available at this point, which it should. OVMM will pick up the guest's state when it queries the ovs-agent on that host.
Again, this is totally unsupported!

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Hi,
When I tried to start a guest either from VM Manager or using xm create vm.cfg' it is giving me this error saying cannot be mounted as loop device /dev/loop100 is already used in guest domain.
PowerOn VM: INSYBVL1 failed:<Exception: return=>failed:<Exception: xm create '/OVS/running_pool/INSYBVL1/vm.cfg'=>Error: Device 768 (vbd) could not be connected. File */OVS/running_pool/INSYBVL1/System.img is loopback-mounted through /dev/loop100, which is mounted in a guest domain, and so cannot be mounted now.* > StackTrace: File "/opt/ovs-agent-2.2/OVSXXenVM.py", line 57, in xen_start_vm run_cmd(cmd) File "/opt/ovs-agent-2.2/OVSCommons.py", line 97, in run_cmd raise Exception('%s=>%s' % (cmd, p.childerr.read())) > StackTrace: File "/opt/ovs-agent-2.2/OVSSiteVM.py", line 86, in start_vm raise e
/var/log/messages showing these messages when I tried to start the guest. The last line saying /etc/xen/scripts/block failed. No idea what exactly that mean.
Aug 9 10:29:04 ed1 kernel: device vif27.0 entered promiscuous mode
Aug 9 10:29:04 ed1 kernel: audit(1281320944.247:94): dev=vif27.0 prom=256 old_prom=0 auid=4294967295
Aug 9 10:29:04 ed1 kernel: xenbr0: port 6(vif27.0) entering learning state
Aug 9 10:29:04 ed1 kernel: xenbr0: topology change detected, propagating
Aug 9 10:29:04 ed1 kernel: xenbr0: port 6(vif27.0) entering forwarding state
Aug 9 10:29:04 ed1 logger: /etc/xen/scripts/block: File /OVS/running_pool/INSYBVL1/System.img is loopback-mounted through /dev/loop0, which is mounted in a guest domain, and so cannot be mounted now.
Aug 9 10:29:04 ed1 kernel: device vif27.1 entered promiscuous mode
Aug 9 10:29:04 ed1 kernel: audit(1281320944.311:95): dev=vif27.1 prom=256 old_prom=0 auid=4294967295
Aug 9 10:29:04 ed1 kernel: xenbr0: port 7(vif27.1) entering learning state
Aug 9 10:29:04 ed1 kernel: xenbr0: topology change detected, propagating
Aug 9 10:29:04 ed1 kernel: xenbr0: port 7(vif27.1) entering forwarding state
Aug 9 10:29:05 ed1 kernel: loop108: fast redirect
Aug 9 10:29:08 ed1 kernel: xenbr0: port 6(vif27.0) entering disabled state
Aug 9 10:29:08 ed1 kernel: device vif27.0 left promiscuous mode
Aug 9 10:29:08 ed1 kernel: audit(1281320948.951:96): dev=vif27.0 prom=0 old_prom=256 auid=4294967295
Aug 9 10:29:08 ed1 kernel: xenbr0: port 6(vif27.0) entering disabled state
Aug 9 10:29:08 ed1 kernel: xenbr0: port 7(vif27.1) entering disabled state
Aug 9 10:29:09 ed1 kernel: device vif27.1 left promiscuous mode
Aug 9 10:29:09 ed1 kernel: audit(1281320949.031:97): dev=vif27.1 prom=0 old_prom=256 auid=4294967295
Aug 9 10:29:09 ed1 kernel: xenbr0: port 7(vif27.1) entering disabled state
Aug 9 10:29:09 ed1 kernel: loop108: dropped 0 extents
Aug 9 10:29:09 ed1 logger: /etc/xen/scripts/block: xenstore-read backend/vbd/27/768/node failed.
Aug 9 10:29:09 ed1 logger: /etc/xen/scripts/block: /etc/xen/scripts/block failed; error detected.
losetup -a showing the following mounted loop devices on the server
/dev/loop0: [0830]:895112952 (/OVS/running_pool/1031_inpeajl3/System.img)
/dev/loop1: [0830]:150668971 (/OVS/running_pool/1031_inpeajl3/INPEAJL3_DISK.img)
/dev/loop10: [0830]:709662 (/OVS/running_pool/275_SERVER_5/System.img)
/dev/loop11: [0830]:895108210 (/OVS/running_pool/OPENFILER01/System.img)
*/dev/loop100: [0830]:709665 (/OVS/running_pool/275_SERVER_5/ovdk_win_vm1.img)*
/dev/loop101: [0830]:580814 (/OVS/running_pool/278_vis12110/System.img)
/dev/loop102: [0830]:524891 (/OVS/sharedDisk/server_5_disk.img)
/dev/loop103: [0830]:580810 (/OVS/running_pool/281_vis12000/System.img)
/dev/loop104: [0830]:524890 (/OVS/sharedDisk/vis1200_1.img)
/dev/loop105: [0830]:524889 (/OVS/sharedDisk/vis1200.img)
/dev/loop106: [0830]:709762 (/OVS/running_pool/390_INPENAW1/System.img)
/dev/loop107: [0830]:709765 (/OVS/running_pool/390_INPENAW1/ovdk_win_vm1.img)
/dev/loop110: [0830]:800542537 (/OVS/running_pool/OPENFILER01/DISK2.img)
/dev/loop111: [0830]:150668974 (/OVS/running_pool/OPENFILER01/DISK3.img)
/dev/loop112: [0830]:800538044 (/OVS/running_pool/OPENFILER01/DISK1)
/dev/loop113: [0830]:580765 (/OVS/running_pool/193_VIS1151020/System.img)
/dev/loop114: [0830]:524884 (/OVS/sharedDisk/VIS115102_Disk1.img)
/dev/loop115: [0830]:800787660 (/OVS/running_pool/193_VIS1151020/VIS115102_Disk2.img)
looks like /dev/loop100 is already used by another guest. However why my new guest is trying to use the loop device which is already used by another guest machine.
Current kernel version of my vm server is
Linux ed1 2.6.18-8.1.15.1.16.el5xen #1 SMP Fri Aug 1 18:27:30 EDT 2008 i686 i686 i386 GNU/Linux
Regards
Balaji V

Hi,
Your xm kernel indicates you are still using 2.1.5 OVM.
The error could be that in the older xm scripts there was an error with /etc/xen/scripts/block.
Not sure if this applies to OVM 2.1.5 but it could...
If possible I would upgrade to OVM 2.2.1
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Auto-start of VM Guest Machines when OVM host starts.

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