Podcast
Questions and Answers
What is the primary function of kubelet?
What is the primary function of kubelet?
What is kube-proxy?
What is kube-proxy?
What is the purpose of DNS in a Kubernetes cluster?
What is the purpose of DNS in a Kubernetes cluster?
What is the function of the container runtime?
What is the function of the container runtime?
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Which of the following is NOT a supported container runtime in Kubernetes?
Which of the following is NOT a supported container runtime in Kubernetes?
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What is the purpose of Cluster DNS in a Kubernetes cluster?
What is the purpose of Cluster DNS in a Kubernetes cluster?
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What is the role of Node Components in a Kubernetes cluster?
What is the role of Node Components in a Kubernetes cluster?
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What is the relationship between DNS and IP addresses?
What is the relationship between DNS and IP addresses?
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What is the primary purpose of a container runtime in Kubernetes?
What is the primary purpose of a container runtime in Kubernetes?
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Which component is responsible for ensuring that containers described in Pods are running and healthy?
Which component is responsible for ensuring that containers described in Pods are running and healthy?
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Study Notes
Containers and Virtualization
- Containers are a form of operating system virtualization, allowing multiple applications to run on a single host machine.
- A container contains all necessary executables, binary code, libraries, and configuration files, but not an operating system, making it lightweight and portable.
Traditional Computer Machine Hardware Virtualization
- Each VM (Virtual Machine) acts as a real computer machine, with its own operating system, virtual hardware, and applications.
- The hypervisor manages the virtual hardware and provides access to the host machine's resources.
Images and Containers
- An image is a lightweight, standalone, executable package that includes everything needed to run a piece of software.
- A container runs an instance of an image, and Docker Hub is a repository of useful images.
Docker Commands
-
docker pullis used to retrieve an image from Docker Hub. -
docker imageslists all pulled images cached locally. -
docker createcreates a new container. -
docker pslists running containers, anddocker startis used to start a container.
Microservices
- Microservices are a distributed software architecture, where a single application is broken down into a suite of small services.
- Each service runs its own process, can be written in any programming language, and is independently deployable and replaceable.
Distributed System and Microservice Architecture
- A distributed system is a network of servers, communicating and coordinating through message passing.
- Microservice architecture is an approach to developing a single application as a suite of small services, each running its own process.
Dockerfile
- A Dockerfile is a text document that contains instructions for building an image.
- The
docker buildcommand builds an image from a Dockerfile.
Managing Containers with Kubernetes
- Kubernetes provides facilities for managing containers in a production environment, ensuring no downtime.
- Kubernetes allows for better support for microservices architectures, isolating, deploying, and scaling individual container building blocks.
Kubernetes Components
- A Kubernetes cluster consists of a set of worker machines (nodes) that run containerized applications.
- The control plane manages the worker nodes and Pods, and consists of components such as the API server, scheduler, and kubelet.
Kubernetes Control Plane Components
- The API server validates and configures data for API objects.
- The scheduler watches for newly created Pods and selects a node for them to run on.
- The kubelet takes a set of Pods and ensures that the containers are running and healthy.
Node Components
- The kube-proxy is a network proxy that runs on each node, allowing network communication to Pods.
- The container runtime is responsible for running containers, and Kubernetes supports several container runtimes.
DNS
- Cluster DNS provides DNS records for Kubernetes services, allowing for translation of domain names to IP addresses.
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Description
Learn about container virtualization, a lightweight and portable approach to running applications and services. Understand how containers differ from server or machine virtualization.
