Use one of the following methods to stop and start an instance.

To pause a server, run the following command:$ nova pause SERVER This command stores the state of the VM in RAM. A paused instance continues to run in a frozen state. To un-pause the server, run the following command:$ nova unpause SERVER

Administrative users might want to suspend an infrequently used instance or to perform system maintenance. When you suspend an instance, its VM state is stored on disk, all memory is written to disk, and the virtual machine is stopped. Suspending an instance is similar to placing a device in hibernation; memory and vCPUs become available.To initiate a hypervisor-level suspend operation, run the following command:$ nova suspend SERVER To resume a suspended server: $ nova resume SERVER