How parameters of an already configured machine can be changed?
The flavour (amount of RAM, no of CPU, system disk size) for the existing machine can be changed. Go to „instances” menu, then select „resize instance” from the machine action menu. Select desired flavour. After resizing you may test if the machine works properly in the new config, then chose either „confirm resize” or „revert resize”. You may loose connection (be logged off) as well as some running procesess may stop working during resize and revert.
Caution: Reducing the size is not always possible or may cause system/software instability!
Other parameters of the machine (its network connections, addresses, network security) may be directly changed from instance action menu.
The "resize" command cannot be applied to VMs provisioned as fixed term resources.