how Kubernetes work.docx
- 1. How Kubernetes work internally? Kubernetes works internally by using a cluster architecture consisting of master nodes and worker nodes. The master node oversees the entire cluster, managing the control plane components such as the API server, etcd (key-value store), scheduler, and controller manager. The API server is the main entry point for interacting with Kubernetes. It exposes a RESTful API that can be used to create, update, and delete resources. The etcd key-value store is used to store the cluster state. This includes information about pods, services, and other resources. The scheduler is responsible for assigning pods to worker nodes. It takes into account factors such as the availability of resources, the load on the nodes, and the affinity and anti-affinity rules for the pods. The controller manager is responsible for ensuring that the desired state of the cluster is maintained. This includes things like restarting pods that fail, scaling pods up or down, and updating the configuration of the cluster. The worker nodes are the machines that run the pods. They are responsible for provisioning resources for the pods, such as CPU, memory, and storage. They also provide networking for the pods. Kubernetes uses a set of concepts to manage containerized applications. These concepts include: Pods: A pod is a group of one or more containers that are deployed together and share a network namespace and IP address. Services: A service is a logical abstraction of a set of pods. It provides a single point of access to the pods, and it can be used to load balance traffic between the pods. Deployments: A deployment is a way to manage the lifecycle of pods. It can be used to create, update, and delete pods.
- 2. Replication controllers: A replication controller is a way to ensure that a specific number of pods are running. Kubernetes is a powerful tool that can be used to manage containerized applications at scale. It provides a number of features that make it easy to deploy, scale, and manage containerized applications. Here is a diagram of the Kubernetes architecture: Code snippet Master Node | | API Server | | etcd | | Scheduler | | Controller Manager | | Worker Node | | ... Use code with caution.