Which technology allows Docker containers to share the same kernel?

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Docker containers share the same kernel through the use of namespaces. Namespaces are a feature of the Linux kernel that provide isolation for system resources. When Docker creates a container, it utilizes namespaces to ensure that each container operates independently, while still being able to share the underlying operating system's kernel.

For example, a container can use a separate network namespace, which allows it to have its own network stack, including its own IP addresses and routing tables, while still being managed by the same host kernel. This efficient use of resources is one of the key advantages of containers compared to traditional virtual machines, which require their own operating system and kernel, resulting in higher overhead.

By leveraging namespaces, Docker enables a more lightweight, resource-efficient way to deploy applications in isolated environments, maintaining the benefits of security and resource management without the need for multiple operating systems to run concurrently.

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