Set up a kubernates cluster on Virtualbox

set_up_kubernates_cluster

# Setting up a kubernetes cluster on Virtual Box

## Server/Node setup

### Install ubuntu 16.04

Login as root using
```
sudo su - 
```

### Enable root login
Edit /etc/ssh/sshd_config setting
```
PermitRootLogin yes
```

### Disable Swap:
kubeadm requires that swap is disabled.  Remove any swap entires from /etc/fstab and run
```
swap off -a
```

### Set up static ip by editing /etc/network/interfaces
```
# The primary network interface
auto enp0s3
iface enp0s3 inet static
        address 192.168.0.141
        netmask 255.255.255.0
        gateway 192.168.0.1
        dns-nameservers 8.8.8.8 8.8.4.4
```

### Install kubernetes dependencies
Create /root/install
```
apt-get update
apt-get install -y docker.io
apt-get update && apt-get install -y apt-transport-https
curl -s https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add -
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb http://apt.kubernetes.io/ kubernetes-xenial main
EOF
apt-get update
apt-get install -y kubelet kubeadm kubectl
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /root/.bashrc
```

And run
```
chmod +x /root/install
/root/install
```

### Setup hostname (if needed)

Edit /etc/hostname
Edit /etc/hosts


Restart
```
shutdown -r
```

## Kubernetes cluster setup

### Master:
```
kubeadm init --pod-network-cidr=10.244.0.0/16
sysctl net.bridge.bridge-nf-call-iptables=1

>kubeadm join --token 1ca6e9.d7ac2d9997bf060c 192.168.0.141:6443 --discovery-token-ca-cert-hash sha256:1eeb98e1f6d92948465450ab075a1472a99f260d093666930ace6e5b855b19cf

export KUBECONFIG=/etc/kubernetes/admin.conf

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/v0.9.1/Documentation/kube-flannel.yml

====

check its up, and after adding each node

kubectl get nodes
kubectl get pods --all-namespaces



### Node

```
kubeadm join --token 1ca6e9.d7ac2d9997bf060c 192.168.0.141:6443 --discovery-token-ca-cert-hash sha256:1eeb98e1f6d92948465450ab075a1472a99f260d093666930ace6e5b855b19cf
```