Resource Scaling
Vertical Scaling
Adding more power to existing machine (RAM, CPU, Storage, etc).
Sacrificing availability of the service because adding resource to existing machine need the machine to be shutdown first.
Horizontal Scaling
Adding more machine to the pool of services.
Keeping the service availability, no need to shutdown the machine first.
Easy to do with virtual environment like Docker.
Service orchestration can be handled by Kubernetes.
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