Câu hỏi phỏng vấn [Global] Kubernetes
Câu hỏi

What does a Pod do?

Câu trả lời

A Kubernetes Pod is the smallest deployable unit in Kubernetes, designed to host one or more containers that share the same network and storage resources. Here is a detailed explanation of what a Pod does:

Function and Structure of a Pod

  1. Encapsulation of Containers:

    • A Pod encapsulates one or more containers, which are tightly coupled and need to share resources such as storage and network[1][2][4]. This encapsulation allows Kubernetes to manage the containers efficiently by providing a shared context.
  2. Shared Resources:

    • Containers within a Pod share the same IP address and port space, enabling them to communicate with each other using localhost[1][2][3]. They also share storage volumes, which can be used for data persistence and inter-container communication[3][4].
  3. Networking and Communication:

    • Pods provide a unique IP address to the containers within them, facilitating intra-Pod communication. For inter-Pod communication, Kubernetes uses services to provide stable IP addresses and DNS names, abstracting the dynamic nature of Pod IP addresses[6].
  4. Lifecycle Management:

    • Pods are ephemeral by design. They are created, assigned a unique ID, and scheduled to nodes where they remain until termination or deletion[8]. If a node fails, the Pods on that node are deleted and can be replaced by new, identical Pods on other nodes[1][8].
  5. Isolation and Security:

    • Pods use Linux namespaces and cgroups to provide isolation for the containers within them. This includes isolating network, filesystem, and process IDs, ensuring that containers within a Pod can operate securely and independently[1][4][7].
  6. Scalability and Replication:

    • Pods support horizontal scaling through replication. Kube...
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