Setup RKE Cluster on Ubuntu 20.04LTS

README.md

Brief

RKE a.k.a Rancher Kubernetes Engine are Kubernetes Deployer by Rancher. Now we will create RKE cluster on Ubuntu 20.04 LTS

Environment

• 2x Ubuntu 20.04LTS
• 16GB RAM
• 50GB Storage
• 4VCPU

Deployment

• Declare Hosts on each node of cluster (All nodes)

nano /etc/hosts

---
192.168.3.151 node1
192.168.3.152 node2

• Declare each node of cluster pubkey to all nodes (All nodes)

ssh-keygen
ssh-copy-id node2
ssh-copy-id node1

• Install docker on each node of cluster

apt update -y && apt-get full-upgrade -y
sudo apt-get update && sudo apt-get install apt-transport-https ca-certificates curl software-properties-common -y
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" 
sudo apt-get update && sudo apt-get install docker-ce containerd.io -y
sudo groupadd docker
sudo usermod -aG docker $USER
newgrp docker

• Download RKE Binary

  • Source : https://github.com/rancher/rke/releases/

  mkdir rke
  wget https://github.com/rancher/rke/releases/download/v1.4.0/rke_linux-amd64
  mv rke_linux-amd64 rke
  chmod +x rke
  

• Grant tcp & root ssh user

nano /etc/ssh/sshd_config

---
AllowTcpForwarding yes
PermitRootLogin yes

systemctl restart sshd

• Deploy with rke command

# Make sure `cluster.yml` on same directory on `rke` binnary.
./rke up

• Create cluster.yml

nodes:
    - address: 192.168.3.151
      user: root
      role: [controlplane, etcd, worker]
      hostname_override: node1
    - address: 192.168.3.152
      user: root
      role: [controlplane, etcd, worker]
      hostname_override: node2
ingress:
  provider: nginx
  options:
    use-forwarded-headers: "true"

• Install Kubectl

curl -LO "https://dl.k8s.io/release/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl"
curl -LO "https://dl.k8s.io/$(curl -L -s https://dl.k8s.io/release/stable.txt)/bin/linux/amd64/kubectl.sha256"
echo "$(cat kubectl.sha256)  kubectl" | sha256sum --check
sudo install -o root -g root -m 0755 kubectl /usr/local/bin/kubectl
chmod +x kubectl
mkdir -p ~/.local/bin
mv ./kubectl ~/.local/bin/kubectl
kubectl version --client

• Create Kubeconfig

mkdir /root/.kube
cp /root/rke/kube_config_cluster.yml /root/.kube/config

• Verify

kubectl get nodes

Cleanup Cluster

nano cleanup.sh

docker rm -f $(docker ps -qa)
docker rmi -f $(docker images -q)
docker volume rm $(docker volume ls -q)

for mount in $(mount | grep tmpfs | grep '/var/lib/kubelet' | awk '{ print $3 }') /var/lib/kubelet /var/lib/rancher; do umount $mount; done


rm -rf /etc/ceph \
       /etc/cni \
       /etc/kubernetes \
       /opt/cni \
       /opt/rke \
       /run/secrets/kubernetes.io \
       /run/calico \
       /run/flannel \
       /var/lib/calico \
       /var/lib/etcd \
       /var/lib/cni \
       /var/lib/kubelet \
       /var/lib/rancher/rke/log \
       /var/log/containers \
       /var/log/kube-audit \
       /var/log/pods \
       /var/run/calico


sudo reboot

chmod +x cleanup.sh
./cleanup.sh

Alternative Kubernetes Deployer

• Kubespray