Create a Cluster
Kubernetes cluster, Minikube
Last updated
Kubernetes cluster, Minikube
Last updated
Kubernetes cluster: a highly available cluster of computers that are connected to work as a single unit
you can deploy an application to a cluster without tying them to a specific machine
containerizing applications makes sure that they are packaged in a way that decouples them from individual hosts
containerized apps are more flexible and available than apps that are installed directly onto specific machines
Kubernetes automates the distribution and scheduling of application containers across a cluster in a more efficient way
a Kubernetes cluster consists of two types of resources:
the Master coordinates the cluster
Nodes are the workers that run applications
The master manages the cluster by coordinating all activities
schedules applications
maintaining applications' desired state
scales applications
rolls out new updates
A node is a virtual machine (VM) or a physical computer that serves as a worker machine in a Kubernetes cluster
each node has a Kubelet, an agent for managing the node and communicating with the Kubernetes master
the node should have tools for handling container operations
e.g. Docker or rkt
a Kubernetes cluster that handles production traffic should have a minimum of three nodes
Masters manage the cluster and the nodes that are used to host the running applications.
when deploying apps to Kubernetes, you tell the master to start the application containers
the master schedules the containers to run on the cluster's nodes
the nodes communicate with the master using the Kubernetes API, which the master exposes
end users can use the Kubernetes API directly to interact with the cluster
a Kubernetes cluster can be deployed on either physical or virtual machines
you can use Minikube to start with Kubernetes development
Minikube: a lightweight Kubernetes implementation that creates a VM on your local machine and deploys a simple cluster containing a single node
available for Linux, macOS, Windows
provides basic bootstrapping operations for working with your cluster
e.g. start, stop, status, delete
minikube version - check that minikube is properly installed
minikube start - start the cluster
once you run those commands, you'll have a running Kubernetes cluster in your online terminal
Minikube started a VM that has a Kubernetes cluster running inside
you can use the kubectl command line interface to interact with Kubernetes
kubectl version - check if kubectl is installed
you can see both the client version and the server version once you run kubectl version
client version: kubectl version
server version: Kubernetes version installed on the master
you can also see details about the build
kubectl cluster-info - view the cluster details
kubectl get nodes - view the nodes in the cluster
shows all nodes that can be used to host applications
we have one node that is ready (to accept applications for deployment)
