Install Kubernetes Cluster Using Kubespray

https://youtu.be/gXJBqQdtPOU

https://www.linuxtechi.com/install-kubernetes-using-kubespray/

Ansible Node (Kubespray Node): Minimal installed Ubuntu 22.04 LTS (192.168.139.149)

1 Controller Node: Minimal Installed Rocky Linux 9 (192.168.139.160)

2 Worker Nodes: Minimal Installed Rocky Linux 9 (192.168.139.161/162)

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Minimum system requirements for kubespray

Master Node: 2 GB RAM, 2 CPU and 20 GB free disk space

Worker Nodes: 2 GB RAM, 2 CPU, 20 GB free disk space

Ansible Node: 2 GB RAM, 1CPU and 20 GB disk space

Internet connectivity on each node

Regular with sudo admin rights

Step 1) Configure Kubespray Node

Login to your Ubuntu 22.04 system and install ansible:

# apt update -y

# apt install git python3 python3-pip -y

# git clone https://github.com/kubernetes-incubator/kubespray.git

# cd kubespray

# pip install -r requirements.txt

# ansible --version

Create the hosts inventory, run below commands and don’t forget to replace IP address that suits to your deployment:

# cp -rfp inventory/sample inventory/mycluster

# declare -a IPS=(192.168.139.160 192.168.139.161 192.168.139.162)

# CONFIG_FILE=inventory/mycluster/hosts.yaml python3 contrib/inventory_builder/inventory.py ${IPS[@]}

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Modify the inventory file, set control node and 2 worker nodes:

# vi inventory/mycluster/hosts.yaml

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Review and modify the following parameters in file “inventory/mycluster/group_vars/k8s_cluster/k8s-cluster.yml”

To enable addons like?kuberenetes dashboard?and?ingress controller, set the parameters as enabled in the file “inventory/mycluster/group_vars/k8s_cluster/addons.yml”

dashboard_enabled: true

ingress_nginx_enabled: true

ingress_nginx_host_network: true

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Step 2) Copy SSH-keys from ansible node to all other nodes

# ssh-keygen

# ssh-copy-id [email protected]

# ssh-copy-id [email protected]

# ssh-copy-id [email protected]

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Step 3) Disable Firewall and Enable IPV4 forwarding

# cd kubespray

# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "sudo systemctl stop firewalld && sudo systemctl disable firewalld"

Run following ansible commands to enable IPv4 forwarding and disable swap on all the nodes:

# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "echo 'net.ipv4.ip_forward=1' | sudo tee -a /etc/sysctl.conf"

# ansible all -i inventory/mycluster/hosts.yaml -m shell -a "sudo sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab && sudo swapoff -a"

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Step 4) Start Kubernetes deployment

Now, we are all set to start Kubernetes cluster deployment, run following ansible playbook from ansible node:

# cd kubespray

# ansible-playbook -i inventory/mycluster/hosts.yaml --become --become-user=root cluster.yml

Now monitor the deployment, it may take 20 to 30 minutes depending on internet speed and hardware resources.

Step 5) Access Kubernetes cluster

Login to master node, switch to root user, run kubectl commands from there:

# kubectl get nodes

# kubectl get pods -A

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