Setup Kubernetes on Ubuntu 16.04

Summary

This setup is supposedly to install the kubernetes on ubuntu machine with version 16.04 (64bit). I did this in the cloud and have worked perfectly.

# whoami && pwd
root
/root
# apt-get update
# apt-get install -y apt-transport-https
# curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
# echo "deb http://apt.kubernetes.io/ kubernetes-xenial main" > /etc/apt/sources.list.d/kubernetes.list
# apt-get update -y
# apt install docker.io
# apt-get install -y kubelet kubeadm kubernetes-cni

Check the swaps, if there any, swith them off

# /proc/swaps

Init kubernetes for the first time using kubeadm:

# kubeadm init --pod-network-cidr=192.168.0.0/16 --apiserver-advertise-address=<private IP>

*Note: Change <private IP> to <public IP>, if you run the kubernetes master on single node and wish to publicly open.

# cp /etc/kubernetes/admin.conf $HOME/
# export KUBECONFIG=$HOME/admin.conf
# echo "export KUBECONFIG=$HOME/admin.conf" | tee -a ~/.bashrc

Check pods status, wait until all running

# kubectl get pods --all-namespaces

When their status are RUNNING, moving forward install the network/flannel. Please choose between these two below, I prefer to use the calico one (the second).

# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
# kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml

# or

# kubectl apply -f https://docs.projectcalico.org/v2.6/getting-started/kubernetes/installation/hosted/kubeadm/1.6/calico.yaml

Continue to taint the nodes:

# kubectl taint nodes --all node-role.kubernetes.io/master-

Install kubernetes dashboard

# kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/master/src/deploy/recommended/kubernetes-dashboard.yaml

Create user dashboard

create-user.yml

apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system

create-role.yml

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system
# kubectl create -f create-user.yml
# kubectl create -f create-role.yml
# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')

How to set the kubernetes dashboard to publicly accessible with public IP

Read this : https://github.com/kubernetes/dashboard/wiki/Accessing-Dashboard—1.7.X-and-above

References

Create partition in Linux that size larger than 2TB

Install parted:

sudo apt-get install parted

Use parted to create partition:

parted /dev/sdb

Inside parted cli, follow these steps:

(parted) mklabel gpt
Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk will be lost. Do you want to continue?
Yes/No? yes
(parted) unit GB
(parted) mkpart primary 0.0GB 3000GB
(parted) print

Format the filesystem we created, using mkfs and try to mount it to mount point:

mkfs.ext4 /dev/sdb1
mkdir /tes
mount /dev/sdb1 /tes