1.4. How to Use a Virtual Machine

1.4.1. Snapshot Management

  • Useful for trial software installation. Remember: just running an operating system creates changes. We can’t restore while the machine is powered on.
  • In VirtualBox > Snapshots:
    • Right click > Take snapshop
    • Right click > Restore snapshot
    • Right click > Delete snapshot (to remove large files)

1.4.2. How to Clone VMs

  • How to give other people the VM? Clone it Can’t give just snapshot
  • Clone snapshot: Right click > Clone

If you are going to be using the clone on the same network as the virtual machine check reinitilise the MAC address of all network cards – otherwise you will have multiple machines with the same MAC address and this will confuse the network.

  • Select: Full clone – so other people can use it
  • Select: Clone everything

Can now give other people the .vdi file (the harddisk) and the .vbox. They can launch this directly in their copy of virtual box.

1.4.3. Adjust Network Adapter

  • Use: NAT (allows Guest to use Internet)
  • Adapter Type: PCnet-Fast III (Am79C973)
  • Can randomise MAC address. 08002731A607 (if other VMs are somehow using the same address)

1.4.4. Types of Storage

  • In VirtualBox: Settings > Storage
  • Ubuntu uses SATA, CD uses IDE.

1.4.5. How to Copy vdi files

  • File > Virtual Media Manager
  • Differencing files are roughly equivalent to snapshots
  • .vdi files have unique identifiers – can’t just copy and paste
  • If you want to copy a snapshot – you must use clone (as above)
  • If you want to copy a VM (that isn’t a snapshot), you can use: File > Virtual Media Manager > Copy > Next > Next > Next > Give it a name > Copy
  • To test the copy, you must add the .vdi file as a harddrive to a virtual machine (not just in the virtual machine manager)