01-06 The Evolution of Computing

Last updated Aug 17, 2023 Edit Source

• A physical server wholly utilized by a single customer.
• Must guess capacity.
• Overpay for an underutilized service.
• Can’t vertical scale, need a manual migration.
• Replacing a server is very difficult.
• Limited by host operating system.
• Multiple apps can result in conflicts in resource sharing.
• You have full control over the server so you are guaranteed security, privacy, and full utility of underlying resources.

• You can run multiple Virtual Machines on one machine.
• Hypervisor is the software layer that lets you run the VMs.
• A physical server shared by multiple customers.
• You pay for a fraction of the server.
• You’ll overpay for an underutilized Virtual Machine.
• Limited by Guest Operating System.
• Multiple apps can run into resource sharing conflicts.
• Easy to import/export images for migration.
• Easy to vertically or horizontally scale.

• Virtual machine running multiple containers
• Docker Daemon is the name of the software layer that lets you run multiple containers.
• You can maximize the utility of the available capacity which is more cost-effective
• Your containers share the same underlying OS so containers are more efficient than multiple VMs
• Multiple apps can run side by side without being limited to the same OS requirements and will no cause conflicts during resource sharing.

• Are managed by VMs running managed containers
• Known as Serverless Compute
• You upload a piece of code, choose the amount of memory and duration.
• Only responsible for code and data, nothing else
• Very cost-effective, only pay for the time code is running, VMs only run when there is code to be executed
• Cold Starts is a side-effect of this setup.
  • VM has to spin up so requests can be slow.