Auto-update blog content from Obsidian: 2025-07-16 10:34:32

content/post/8-create-manual-kubernetes-cluster-kubeadm.md

@@ -0,0 +1,84 @@
+---
+slug: create-manual-kubernetes-cluster-kubeadm
+title: Template
+description: 
+date: 
+draft: true
+tags: 
+categories:
+---
+
+## Intro
+
+In this [previous article]({{< ref "post/7-terraform-create-proxmox-module" >}}), I explained how to deploy 6 VMs using **Terraform** on **Proxmox**, 3 masters and 3 workers nodes, based on [cloud-init template]({{< ref "post/1-proxmox-cloud-init-vm-template" >}}).
+
+Now that the infrastructure is ready, let’s move on to the next step: **manually building a Kubernetes cluster** using `kubeadm`.
+
+In this post, I’ll walk through each step of the installation process of a simple Kubernetes cluster, from preparing the nodes to deploying a simple application.
+
+I will not rely on automation tools for now, to better understand what are the steps involved in a Kubernetes cluster bootstrapping.
+
+---
+## What is Kubernetes
+
+Kubernetes is an open-source platform for orchestrating containers across a group of machines. It handles the deployment, scaling, and health of containerized applications, allowing you to focus on building your services rather than managing infrastructure details.
+
+A Kubernetes cluster is made up of two main types of nodes: control plane (masters) nodes and worker nodes. The control plane is responsible for the overall management of the cluster, it makes decisions about scheduling, monitoring, and responding to changes in the system. The worker nodes are where your applications actually run, inside containers managed by Kubernetes.
+
+In this post, we’ll manually set up a Kubernetes cluster with 3 control plane nodes (masters) and 3 workers. This structure reflects a highly available and production-like setup, even though the goal here is mainly to learn and understand how the components fit together.
+
+---
+## Prepare the Nodes
+
+    OS-level updates and basic tools
+
+    Disabling swap and firewall adjustments
+
+    Installing container runtime (e.g., containerd)
+
+    Installing kubeadm and kubelet
+
+    Installing kubeadm on bastion
+
+    Enabling required kernel modules and sysctl settings
+
+## Initialize the Cluster
+
+    Running kubeadm init
+
+    Configuring kubectl on the bastion
+
+    Installing the CNI plugin Cilium
+
+
+## Join Additional Nodes
+
+### 	Join Masters
+
+    Creating the control-plane join command
+
+    Syncing PKI and etcd certs
+
+    Running kubeadm join on master 2 and 3
+### 	Join Workers
+
+    Generating and running the worker kubeadm join command
+
+    Verifying node status
+
+
+## Deploying a Sample Application
+
+    Creating a simple Deployment and Service
+
+    Exposing it via NodePort or LoadBalancer
+
+    Verifying functionality
+
+## Conclusion
+
+    Summary of the steps
+
+    When to use this manual method
+
+