Cheat sheet
create
gcloud compute instances start swarm-manager
set-machine-type
Before set-machine-type
gcloud config set compute/zone us-central1-a
Instances should be stopped
gcloud compute instances set-machine-type swarm-manager --machine-type g1-small
stop
gcloud compute instances stop swarm-manager
Completion makes life easier, just use it
eval $(gcloud completion zsh)