Steps
1. Install Oracle Virtualbox & Extension pack
Download from here - https://www.virtualbox.org/wiki/Download_Old_Builds_5_2
2. Download Ubuntu ISO( ubuntu-18.04.3-desktop-amd64.iso ) image from below link
https://ubuntu.com/download/desktop
3. Create virtual machine in virtual box.
Minimum Requirement is : 2 GB RAM, 1 VCPUYou can follow below blog for more details.
https://www.wikihow.com/Install-Ubuntu-on-VirtualBox
4. Sample virtual machine
After successfully setup virtual machine, you need to install guest additions as described below.
https://www.virtualbox.org/manual/ch04.html
5. Key points when creating a virtual machine
Network Settings:
- You need to connect to internet so we have to use NAT network adapter
- Also we are using bridged adapter as the cluster communication network, and it's IP as static IP
- Configure the adapters as mentioned in the image
6. Once you setup virtual machine you need to install Docker and disable swap
7. Setup the virtual machine. Execute following commands in a terminal
sudo apt-get update
sudo apt install net-tools
Change hostname
Change hostname
sudo hostnamectl set-hostname "k8s-master"
exec bash
8. Install Docker
sudo dpkg --configure -a
Install relevant packages
sudo apt install apt-transport-https ca-certificates curl software-properties-common
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu bionic stable"
sudo apt update
apt-cache policy docker-ce
sudo apt install docker-ce
Use Docker as normal user
sudo usermod -aG docker ${USER}
su - ${USER}
sudo systemctl start docker
sudo systemctl enable docker
9. Create a static IP
Type below command and select enp0s9 entry
ifconfig -a
enp0s9: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.0.166 netmask 255.255.255.0 broadcast 192.168.0.255
inet6 fe80::a00:27ff:fe7c:faba prefixlen 64 scopeid 0x20<link>
ether 08:00:27:7c:fa:ba txqueuelen 1000 (Ethernet)
RX packets 21115 bytes 8269767 (8.2 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 14770 bytes 1610853 (1.6 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
sudo vim /etc/network/interfaces
insert below code block to above file
auto enp0s9
iface enp0s9 inet static
address 192.168.0.166
netmask 255.255.255.0
Change /etc/hosts file with below IP entries
sudo vim /etc/hosts
192.168.0.166 k8s-master
192.168.0.178 k8s-worker-node2
10. Install Kubernetes
Install relevant packages
sudo apt install apt-transport-https ca-certificates curl software-properties-common
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add
sudo apt-add-repository "deb http://apt.kubernetes.io/ kubernetes-xenial main"
sudo apt update
Disable swap
sudo swapoff -a
vim /etc/fstab
comment out lines which indicate about swap
example :
#/swapfile none swap sw 0 0
sudo apt-get install kubeadm -y
11. Cloning virtual machine as worker/slave node
Use below link but clone this as FULL clone
12. Setup Kubernetes Master
sudo kubeadm init --apiserver-advertise-address=192.168.0.166 --pod-network-cidr=192.168.0.0/24
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Save below out put to a file
kubeadm join 192.168.0.166:6443 --token pa36ca.1e073aktjf9rac6m \
--discovery-token-ca-cert-hash sha256:b850d754741005a6d7f2a096441d3c229dd23bc3a0078157c5d815a22216bc34
13. Setup Kubernetes in Slave node
Do step 9 and 10. Then execute below command to join slave node to cluster
Then change hostname
Then change hostname
sudo kubeadm join 192.168.0.166:6443 --token pa36ca.1e073aktjf9rac6m \
--discovery-token-ca-cert-hash sha256:b850d754741005a6d7f2a096441d3c229dd23bc3a0078157c5d815a22216bc34
14. Deploy Flannel as Pod Network in both master and slave nodes
sudo kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
15. Verify the cluster from master node
kubanetes@k8s-master:~$ kubectl get pods --all-namespaces
NAMESPACE NAME READY STATUS RESTARTS AGE
kube-system coredns-5644d7b6d9-vwnfx 0/1 Running 0 8m37s
kube-system coredns-5644d7b6d9-zwgvn 0/1 Running 0 8m37s
kube-system etcd-k8s-master 1/1 Running 0 7m59s
kube-system kube-apiserver-k8s-master 1/1 Running 0 8m1s
kube-system kube-controller-manager-k8s-master 1/1 Running 0 7m51s
kube-system kube-flannel-ds-amd64-wk5s6 1/1 Running 0 27s
kube-system kube-proxy-xgcjh 1/1 Running 0 8m37s
kube-system kube-scheduler-k8s-master 1/1 Running 0 7m56s
kubanetes@k8s-master:~$ kubectl get nodes
NAME STATUS ROLES AGE VERSION
k8s-master Ready master 26m v1.16.3
k8s-worker-node2 Ready <none> 114s v1.16.3
