The article explores the role of Linux namespaces in enhancing container isolation, focusing on their implementation in Docker. By compartmentalizing global system resources like network interfaces, processes, and file systems, namespaces create an isolated environment for applications, which is crucial for maintaining security, managing resources, and simplifying container management. Docker utilizes various types of namespaces, such as PID, network, and user namespaces, to prevent conflicts and ensure that processes within containers are isolated from each other and the host. This isolation is vital for container security, preventing intrusions and safeguarding data privacy in multitenant applications. The article also discusses the practical use of shared namespaces in Docker and Kubernetes, highlighting the benefits and risks of sharing namespaces and recommending Kubernetes pods for production environments due to their designed capability to manage multiple containers in a cohesive manner. Ultimately, the article underscores the foundational role of Linux namespaces in the secure and efficient operation of containerized applications in shared systems.