Docker Online Training | Kubernetes Online Training

1. What is Node Controller in Kubernetes? Introduction: Kubernetes, an open-source platform developed by Google, automates the deployment, scaling, and management of containerized applications. It has become the de facto standard for container orchestration, enabling organizations to manage large clusters of containers efficiently. Within Kubernetes, various controllers manage different aspects of the cluster’s operations. Docker and Kubernetes Training What is a Node in Kubernetes? Before diving into the Node Controller, it's essential to understand what a node is in the context of Kubernetes. A node is a physical or virtual machine within the Kubernetes cluster that runs containerized applications. Each node contains the necessary services to run Pods, which are the smallest deployable units in Kubernetes. Role of the Node Controller: The Node Controller is a key component of the Kubernetes control plane, responsible for monitoring and managing the state of nodes within the cluster. Node Registration and Heartbeats: When a node is added to the Kubernetes cluster, it is registered by the Node Controller. The Node Controller then monitors the node's status through periodic heartbeats. These heartbeats are sent by the kubelet on each node and are used to determine the node’s health. Kubernetes Online Training Monitoring Node Health:

2. The Node Controller continuously monitors the health of all nodes in the cluster. It uses node status updates to check for any anomalies or issues. If a node is reported as unhealthy, the Node Controller initiates actions to mitigate the impact on the cluster, such as cordoning off the node to prevent new pods from being scheduled on it. Node Eviction: When a node is determined to be unresponsive or unhealthy, the Node Controller evicts the pods running on that node. This process ensures that workloads are not left stranded on a node that cannot service them. Node Maintenance and Lifecycle Management: The Node Controller plays a crucial role in managing the lifecycle of nodes, including their addition, maintenance, and removal from the cluster. When nodes are scheduled for maintenance, they can be gracefully drained of running pods to avoid disruption. Docker Online Training Handling Node Taints and Tolerations: Kubernetes allows nodes to be tainted, which prevents pods from being scheduled on them unless they tolerate the taint. The Node Controller manages these taints and ensures that pods with the appropriate tolerations are scheduled on the correct nodes. Conclusion: The Node Controller is a vital component of Kubernetes, ensuring the stability and reliability of the cluster by managing the state of nodes. Its responsibilities include monitoring node health, handling node registration and evictions, and managing node lifecycle events. Contact us +91-9989971070 Register now for Docker and Kubernetes Online Training Visit: https://www.visualpath.in/DevOps-docker-kubernetes-training.html Visit Blog: https://visualpathblogs.com/