Cluster maintenance

List instances
z2-8:~# gnt-instance list

Reboot
z2-8:~# gnt-instance shutdown cardstories2.politis.vm.gnt ; gnt-instance start cardstories2.politis.vm.gnt

Add RAM
z2-8:~# gnt-instance modify -B memory=4G hackit.politis.vm.gnt

+ reboot

Add partition
z2-8:~# gnt-instance modify --disk add:size=50G cardstories2.politis.vm.gnt

=> next time it boots /dev/vd[a,b,c...] is added