When you create an EC2 instance it can be added to up to five security groups. But what are they actually and how do they work?
When you run temporary workloads you may not want to leave old machine instances lingering behind. Preemptible VM instances let you run at a significantly discounted price but they are shut down automatically after 24 hours, or earlier if Google needs those resources. The instances will still remain there in shut down state and they can still be turned back on later. What if you wanted to delete the machines automatically when you're done with them?