You can specify other contexts on the command line using the –context flag. The current context is the cluster that is currently the default for kubectl, and is the argument passed to the –context flag. You can have different contexts to switch between different Kubernetes clusters easily.Įach context contains a Kubernetes cluster, a user, and a namespace. It includes information about the cluster, the user, and the namespace to be used. What is a Context?Ī context in Kubernetes is a way to manage multiple clusters and their authentication information. Namespaces help in organizing and isolating resources, so different teams or projects can have their resources without interfering with each other. They are like separate virtual clusters within the same physical cluster. Namespaces provide a way to divide a single Kubernetes cluster into multiple virtual clusters. The CA certificate and private key are stored in the Kubernetes configuration file.įor example, in your Kubernetes configuration file, you might have the following: The private key is used to sign the certificates of all the nodes in the cluster. The CA certificate is used to sign the certificates of all the nodes in the cluster. The master node is responsible for scheduling and coordinating tasks, while the worker nodes execute those tasks.Ĭlusters in Kubernetes are identified by their respective Certifate Authority (CA) certificate and private key. It consists of a master node that manages the entire cluster and multiple worker nodes that run the containers. What is a Cluster?Ī Kubernetes cluster is a set of physical or virtual machines (nodes) that work together to run containerized applications. The configuration file is used by the kubectl command-line tool to authenticate and access the cluster. It also contains information about the user, such as the user’s certificate and private key. It is quite a complex tool, and hopefully, this cheat sheet will. Kubectl is the main and official tool to interact with a Kubernetes cluster. Yes, it will be a chore to repeat that every time, but applying the wrong command to the wrong cluster could potentially be catastrophic. What is a Kubernetes Config file?Ī Kubernetes configuration file is a YAML file that contains information about the cluster, such as the cluster name, the cluster’s certificate authority (CA) certificate, and the cluster’s private key. kubectl -contextminikube apply -f BIGCHANGE.YAML. In this article, we will learn the difference between a context and a cluster in Kubernetes.
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