Introduction to Deployment with kubeadm

  • kubeadm consists of the following:

  • Master
    • kube-apiserver
    • etcd
    • node-controller
    • replica-controller
  • Worker 1
    • kubelet
    • container runtime (docker)
  • Worker 2
    • kubelet
    • container runtime (docker)

  • Installing all of the above components and setting up certificates is tedious.

  • Need to install containerd on all of the nodes.

  • Then need to install the kubeadm tool on all of the nodes as well.

  • Kubernetes installs all of the right components on the right nodes in the right order.

  • Need to initialise the Master Node.

  • Once the Master Node is initialised, but before the Worker Nodes are hooked up to the cluster, Network prerequisites must be met.

    • Normal networking is not good enough, the Master Node needs a special networking solution between the Master and Worker Nodes called the POD Network.

  • Once the POD Network is setup, the Worker Nodes join the Master Node.

  • Can then deploy the application onto the Kubernetes environment.

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