How are pods organized in Kubernetes? What technologies are used for isolation? What types of namespaces do you know?

Pods in Kubernetes are the smallest deployable units that can contain one or more containers running on the same host and sharing network and storage.

Isolation in Kubernetes is built on Linux technologies such as namespaces and cgroups:

• Namespaces provide resource isolation: PID, Network, Mount, IPC, UTS, User.
• cgroups limit and control resource usage (CPU, memory, disk).

Types of Linux namespaces used in Kubernetes:

• PID namespace — process isolation.
• Network namespace — separate network stack (IP, ports).
• Mount namespace — isolation of mount points.
• IPC namespace — isolation of inter-process communication.
• UTS namespace — isolation of hostname and domain name.
• User namespace — isolation of users and groups.

Kubernetes uses these mechanisms so that containers within a pod can communicate with each other via localhost, and pods are isolated at the network and process level.

Additionally, Kubernetes employs cgroups to control resources, limiting CPU and memory consumption by each pod.