3 Node kubeadm cluster on VirtualBox

Kubernetes installation using Kubeadm

Prerequisites

git clone https://github.com/JULIANCHO923/kubeadm.git

Check the status. This Vagranfile consists of 3 virtual machines (VM):

vagrant status

Current machine states:

kubemaster not created (virtualbox) kubenode01 not created (virtualbox) kubenode02 not created (virtualbox)

We are going to initialization the VMs, it can take a few minutes installing pre-requisite tools

vagrant up

Check the status. The VMs should be running

Current machine states:

kubemaster running (virtualbox)

kubenode01 running (virtualbox)

kubenode02 running (virtualbox)

Now, we are going to access the kubemaster node

vagrant ssh kubemaster

We need to get the current IP address, then you can set the IP in the advertise-address to initialize kubeadm

ifconfig

kubeadm reset
kubeadm init --pod-network-cidr=10.244.0.0/16 --apiserver-advertise-address=192.168.56.11

Your Kubernetes control-plane has initialized successfully! SAVE the join value

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

weave Net

Download this https://github.com/weaveworks/weave/releases/download/v2.8.1/weave-daemonset-k8s.yaml

If you do set the --cluster-cidr option on kube-proxy, make sure it matches the IPALLOC_RANGE given to Weave Net (see below).

spec:
    containers:
    - command:
    - /home/weave/launch.sh
    env:
    - name: IPALLOC_RANGE
        value: 10.244.0.0/16
    - name: INIT_CONTAINER
        value: "true"
    - name: HOSTNAME
        valueFrom:
        fieldRef:
            apiVersion: v1
            fieldPath: spec.nodeName
    image: weaveworks/weave-kube:latest

Joining Nodes to the Kubernetes cluster

Then you can join any number of worker nodes by running the following on each as root:

sudo su
kubeadm reset

Take the join value

kubeadm join 192.168.56.11:6443 --token ?????????? \
        --discovery-token-ca-cert-hash ????????????