MetaCloud testbed – quick guide

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(Czech version)

We guide you to run a virtual machine through OpenNebula web interface.


Common terms

VM = virtual machine

template a set of requirements for virtual machine. It can be:

  • CPU number
  • RAM memory size
  • file with disc image that defines an operating system installed in VM
  • requirements for IP address
  • whether should be console VM available in web interface by VNC
  • parameters contextualisation, setting particular features after VM start, for example ssh keys of VM owner

image - disc image, the file system with preinstalled operating system. Image may be:

  • perzistent – changes in image are kept also after deleting VM. One particular image can be attached to only one particular virtual machine.
  • nonperzistent – it may be part of several currently running VM. When new VM is created, nonpersistent image is copied to the VM. After deleting VM, the image is deleted too. But it is also possible to save an image of running VM thus save changes done in nonpersistent image.

Login in web interface

Register to the Metacentrum cloud and log in the web interface.

OpenNebula 4.10 we interface has two types of view that differs significantly:

  • view cloud, the more simple view to run new virtual machines
  • view user, the more complex view with more settings and informations

Default settings is cloud view.

How to switch between views is described in Switching regimes of Open Nebula.

Run virtual machine

Run virtual machine in cloud view

There is an icon VMs in upper right corner and then the plus button.


Opennebula cloudview new vm.png

New page appears, choose short name of new virtual machine. A list with available templates appears, it also involves operating system icons. You may filter this list by inserting a string into search field.

Click on the template.


Opennebula cloudview select template.png

You may change number of CPU or amount of RAM memory in Capacity.

You may also remove some from IP addresses in Network. We recommend not to add an additional IP addresses, because an impossible combination can be created by allocating VM to physical device and IP address.

Confirm new VM by pressing a button Create down on the page.


Opennebula cloudview create vm.png

New virtual machine will be in DEPLOYING state for a moment:


Opennebula cloudview vm deploying.png


and after a while, it switches to RUNNING. The idle is caused by time necessary to copy image to physical device and operating system boot.

Assigned IP address is highlighted in picture:


Opennebula cloudview vm ip.png


Log in virtual machine Login.

Run a virtual machine in user view

  • in left menu choose Virtual Resources and then Templates, templates list appears
  • choose any template, list may be filtered by using of search box
  • click on Instantiate

Obrázek: new virtual machine start

  • choose any name in dialog window and confirm.

Obrázek: zadání jména virtuálního stroje

  • choose Virtual machines in left menu, click on the VM in list, VM detail with bookmark Info appears, wait for a while, as soon as VM will be in RUNNING state, iddle is neccesary due to copy disc image to physical device and operating system boot.

Obrázek: stav VM

  • switch to the bookmark Network and note assigned public IP address.

Obrázek: zjištění IP adresy virtuálního stroje

Login to virtual machine

Prepared images by our side downloads updates and reboots, so wait for a while until virtual machine gets to the state RUNNING.

By ssh

To login to running virtual machine with OS Linux as a user root by ssh (your ssh key is in your application form and is imported by kontextualization,

ssh root@ip_adresa

where ip_address is your virtual machine public IP address.

You may use to remote access to the virtual machine program Putty, if you use Windows operating system in the image.

If everything is properly set, you can login to the machine as a root, this machine works as "ordinary" remote machine. In case of problems, you may ask our user support.


Opennebula ssh.png


By VNC

If VM template supported VNC usage, you may use graphical interface of operating system in virtual machine. Linux shows the CLI only, whereas Windows is more usable for users.

After running VM, button VNC will be active.

In view cloud upper left:

Opennebula cloudview vnc button.png

In view user upper right:

Opennebula userview vnc button.png

after a clicking on VNC button, VNC client GUI appears in a browser:

Opennebula vnc windows.png

You can not use other VNC client and connect directly, because VNC server do not listen on public IP address. But programs as Remote desktop or TeamViewer may be used.


Virtual machine environment

You can operate virtual machines with OS Linux by commands typed in CLI. You may get more familiar with Linux commands by getting through tutorials.

Your Virtual Machine is fully under your control, our administrators have no access to it. You are fully responsible for it.

Warning.gif WARNING: Keep software up to date in running virtual machine!

If you no longer use the virtual machine, turn it off (Undeploy) or delete it (Shutdown).

Virtual machine administrating and states

In view cloud

Administration is really simple, you may reboot, stop or delete the virtual machine by three buttons (see the Figure):

Opennebula cloudview vm detail.png

Every time, you do not need a virtual machine, shut it down or undeploy. The virtual machine that is only stopped, blocks the physical machines where they are allocated.


In view user

There is more options to administer the virtual machine than in view cloud.

Virtual machine stop

There is a button in the virtual machine detail to change the state:

Opennebula ovladani vm.png

Full description is in dokumentaci OpenNebuly, the summary:

  • Suspend - suspend to disc (hibernation), similarly when your notebook is "sleeping", VM stays in the physical device
  • Power Off - sent ACPI signal to OS, similarly as you turn off our notebook, VM stays in the physical device
  • Power Off hard - turn off OS immediately, similarly as when you plug out accidentally power supply from your PC. VM stays in physical device.
  • Stop - suspend to disk (hibernation) and virtual machine is moved from physical device to datastore
  • Undeploy - sent ACPI signal to OS, turn it off and move physical device to datastore
  • Undeploy hard - turn off OS immediately and move VM from physical device to datastore

Suspend and Stop hibernate, after switching to state RUNNING, programs continue in running. Power Off and Undeploy turn off OS, so virtual machine boots after changing state to RUNNING.

There is no reason to keep virtual machine in power off state, it blocks dedicated memory, CPUs and disc space. Please, use state Undeploy instead.

All states above keep disc state also in nonpersistent images, VM is not deleted, only suspended. Similarly, IP address keeps assigned. Please, delete all idle virtual machines to relase IP addresses.

Virtual machine deleting

Opennebula delete vm.png

  • Shutdown - send ACPI signal to OS, wait until OS is terminated, copy persistent disc images, deletes nonpersistent disc images, deletes virtual machine
  • Shutdown hard - similarly as Shutdown, but end OS immediately (similarly as plug out PC)
  • Delete - deletes immediately virtual machine, do not copy persistent discs!

Standard approach for deleting virtual machine with operating system with ACPI support (all prepared images) is command Shutdown.

After deleting a virtual machine, nonpersistent disc is deleted!

What next?

The most common use cases with cloud.

You may also see detailed howto.