What technology is used to isolate applications on the same physical server without using full virtual machines?

What technology is used to isolate applications on the same physical server without using full virtual machines?

• A. Containers
• B. Hypervisors
• C. Virtual Machines
• D. Jails

Answer: (A)

OS-level virtualization with containers isolates applications on the same physical server without needing full virtual machines. Containers run as separate, isolated user-space instances that share the host's operating system kernel. They achieve this isolation using mechanisms like namespaces, which give each container its own view of the filesystem, network, and processes, and cgroups, which limit and regulate resources such as CPU and memory. Because containers package only the application and its dependencies, they’re lightweight and start up much faster than full VMs, which require separate guest operating systems and a hypervisor. This makes containers ideal for running multiple applications securely on one server with consistent environments. Jails are a similar concept in BSD, but the modern, widely adopted approach is container technology.

OS-level virtualization with containers isolates applications on the same physical server without needing full virtual machines. Containers run as separate, isolated user-space instances that share the host's operating system kernel. They achieve this isolation using mechanisms like namespaces, which give each container its own view of the filesystem, network, and processes, and cgroups, which limit and regulate resources such as CPU and memory. Because containers package only the application and its dependencies, they’re lightweight and start up much faster than full VMs, which require separate guest operating systems and a hypervisor. This makes containers ideal for running multiple applications securely on one server with consistent environments. Jails are a similar concept in BSD, but the modern, widely adopted approach is container technology.