Which statement about containerization is true?

Which statement about containerization is true?

• A. It uses OS-level isolation and shares the host kernel.
• B. It requires a full separate kernel for each container.
• C. It does not support running multiple apps on one host.
• D. It provides hardware-level virtualization.

Answer: (A)

Containerization is based on OS-level virtualization that shares the host kernel. Instead of shipping a full operating system with each environment, containers run as isolated processes on the same host OS, using features like namespaces to separate processes, networks, and file systems, and cgroups to control resource use. This setup keeps containers lightweight and fast to start, since there’s no need to boot separate kernels or run multiple operating systems. Because of this, the idea that each container needs its own separate kernel is not true for containers—it describes traditional full virtualization, where each virtual machine includes its own kernel. Containers are designed to run multiple apps on one host by compartmentalizing them without duplicating the kernel. They do not provide hardware-level virtualization, which would involve a hypervisor and virtual machines rather than OS-level isolation.

Containerization is based on OS-level virtualization that shares the host kernel. Instead of shipping a full operating system with each environment, containers run as isolated processes on the same host OS, using features like namespaces to separate processes, networks, and file systems, and cgroups to control resource use. This setup keeps containers lightweight and fast to start, since there’s no need to boot separate kernels or run multiple operating systems.

Because of this, the idea that each container needs its own separate kernel is not true for containers—it describes traditional full virtualization, where each virtual machine includes its own kernel. Containers are designed to run multiple apps on one host by compartmentalizing them without duplicating the kernel. They do not provide hardware-level virtualization, which would involve a hypervisor and virtual machines rather than OS-level isolation.