I have a Node.js app that provides a service which cannot be interrupted.
However the load to the app varies overtime and to save cost I would like the vm instance machine type to autoscale in function of the load (ie when over 80% CPU utilisation, scale up from 1 vCPU(3.75 GB memory, n1-standard-1) to 2vCPU(7.5 GB memory, n1-standard-2))
Is this possible?
PS: I have looked at using the container engine and kubernetes but due to how the app operates, the app cannot be replicated to multiple pods and continue working
You can only change the machine type of a stopped instance and an instance is considered stopped only when the instance is in the TERMINATED state. It is not possible to change the machine type of a running instance.
https://cloud.google.com/compute/docs/instances/changing-machine-type-of-stopped-instance
来源：https://stackoverflow.com/questions/45037213/how-to-vertically-scale-google-cloud-instance-without-stopping-running-app