OpenStack is a popular open-source toolkit for building private clouds.

VM creation

When a VM instance is created through NodeConductor, it is created using Cinder service with 2 volumes:

  • root volume containing OS root image, bootable;
  • data volume an empty volume for data.

VM resize (flavor)

To change memory or CPU number, a flavor should be changed. Please note, that the disk size is not affected. Change can happen only for a stopped VM.

VM resize (disk)

Increasing a disk size means extension of the data volume attached to the instance. The process includes detaching of a data volume, extending it and re-attaching to a VM. Disk can be increased only for a stopped VM.