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Deploy production-ready Kubernetes clusters with K3s
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ShellMIT#devops#k3s#kubernetes#shell
⑂ 0 forks◯ 0 issuesUpdated Feb 19, 2026
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kubernetes-devsecops-playbook
Production-ready Kubernetes cluster setup using kubeadm, automated with Ansible and bash scripts. Designed for learning, practice, and DevOps portfolio projects.
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README preview
🚀 Kubernetes Cluster Setup using Kubeadm (Manual + Automation)
This project provides a step-by-step Kubernetes cluster setup using kubeadm, along with:
- ✅ Manual setup commands
- ✅ Automated Bash script
- ✅ Ansible playbook
📌 Features
- Kubernetes installation using official repo
- Container runtime: containerd
- Swap disable & system configuration
- Network configuration (IP forwarding)
- kubeadm cluster initialization
- Optional kubeconfig export to local machine
- Version selection support
🧰 Requirements
- Ubuntu 20.04 / 22.04
- Root or sudo access
- Internet connection
⚙️ Manual Installation Steps
1. Install Dependencies
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gpg
2. Add Kubernetes Repository
sudo mkdir -p /etc/apt/keyrings
curl -fsSL https://pkgs.k8s.io/core:/stable:/v1.35/deb/Release.key \
| sudo gpg --dearmor -o /etc/apt/keyrings/kubernetes-apt-keyring.gpg
echo 'deb [signed-by=/etc/apt/keyrings/kubernetes-apt-keyring.gpg] https://pkgs.k8s.io/core:/stable:/v1.35/deb/ /' | sudo tee /etc/apt/sources.list.d/kubernetes.list
3. Install Kubernetes Components
sudo apt-get update
sudo apt-get install -y kubelet kubeadm kubectl
sudo apt-mark hold kubelet kubeadm kubectl
4. Install containerd
sudo apt install containerd -y
sudo mkdir -p /etc/containerd
containerd config default | sed 's/SystemdCgroup = false/SystemdCgroup = true/' \
| sudo tee /etc/containerd/config.toml
sudo systemctl restart containerd
5. System Configuration
sudo swapoff -a
sudo sed -i '/\sswap\s/s/^/#/' /etc/fstab
sudo modprobe br_netfilter
sudo bash -c 'echo 1 > /proc/sys/net/ipv4/ip_forward'
sudo bash -c 'echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables'
sudo bash -c 'echo 1 > /proc/sys/net/bridge/bridge-nf-call-ip6tables'
6. Initialize Cluster
sudo kubeadm init \
--apiserver-advertise-address <MASTER_IP> \
--pod-network-cidr "10.244.0.0/16" \
--upload-certs
7. Configure kubectl
mkdir -p $HOME/.kube
sudo cp /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
Set node IP to private network (eth1 in Vagrant)
IP=$(hostname -I | awk '{print $2}')
sudo sed -i "s|^KUBELET_EXTRA_ARGS=.*|KUBELET_EXTRA_ARGS=--node-ip=$IP|" /etc/default/kubelet
sudo systemctl daemon-reexec
sudo systemctl restart kubelet
🛠️ Automation Options
🔹 Bash Script
chmod +x install-k8s.sh
./install-k8s.sh
🔹 Ansible Playbook
ansible-playbook playbook.yml
🔥 Optional Features
- Export kubeconfig to local machine
- Skip kubectl install on control-plane
- Select Kubernetes version
⭐ Support
If you find this project helpful, please give it a star ⭐ on GitHub.
🌐 Connect With Me
💡 "Turning ideas into production-ready systems."
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