What is a major disadvantage of virtual machines versus containers?
One major disadvantage of virtual machines (VMs) compared to containers is their operational management complexity.
Virtual machines are complete guest operating systems running on top of a host operating system, which makes them heavier and slower than containers. Each VM requires its own operating system, which means a larger disk footprint and more overhead. VMs also require more system resources, such as memory and CPU, to run efficiently.
Additionally, VMs require more operational management overhead, including patching, updating, and managing the guest operating systems. Since each VM runs a separate operating system, each system requires its own set of updates and patches, leading to higher operational costs and increased complexity.
Containers, on the other hand, are lightweight and share the host operating system, allowing for a smaller disk footprint and less overhead. This makes them easier to deploy, scale, and manage. Containers also allow for rapid deployment, as they can be spun up and destroyed quickly, without the need for lengthy boot times.
In summary, while VMs offer a higher level of isolation and security, they come with increased operational management complexity, which is a significant disadvantage compared to containers.