[one-ecosystem] Read VM ID from inside a running VM

[Papenbrock, Thorsten]

Hello mailing list,

I built a small application that uses the OCCI and EC2 interface to automatically start and delete Virtual Machines in my private OpenNebula cloud. Each VM runs a service that reports how busy a certain VM actually is. Using this service, my application creates and deletes VMs depending on the overall load of the cluster.

Now, my problem is that I always want to delete the VM with the lowest load, but the application does not know the VM to which a particular service belongs. Therefore, I need to know the VM ID, which has been assigned automatically by OpenNebula, from inside a running VM. Then, each service could also report the VM ID to my application so that it can delete the right VM.

Is there a way to query this VM ID from inside the VM? Or can I configure OpenNebula to automatically store the VM ID in, for example, a text file inside a VM when it creates the VM? It would also help if the application could query an IP-to-VM ID mapping from OpenNebula, if such a mapping exists for VMs that are created with bridged DHCP network access.

Many thanks for your help in advance,
Thorsten Papenbrock
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