Migrating Kubernetes Cluster Networking from Flannel to Calico
Preparing the Calico Configuration
To begin the migration, download the Calico manifest that utilizes etcd as the datastore. This is common in custom-provisioned clusters where etcd is managed independently.
curl https://docs.projectcalico.org/manifests/calico-etcd.yaml -o calico-config.yaml
Configuring etcd Secrets and Endpoints
Calico needs ...
Posted on Thu, 06 Aug 2026 16:05:04 +0000 by Marijnn
Installing Kubernetes 1.25 on a Cloud Server via Kubeadm for Lab Use
Kubernetes Environment Planning
Pod Network (podSubnet): 10.244.0.0/16
Service Network (serviceSubnet): 10.96.0.0/12
Lab Environment Specifications:
Operating System: CentOS 7.5
Configuration: 2GB RAM / 4 vCPU / 50GB HDD
Initializing the Kubernetes Cluster Environment
First, set up the production environment server. Later, node environments can ...
Posted on Fri, 10 Jul 2026 17:31:44 +0000 by rcatal02
Deploying a Kubernetes 1.26 Cluster with containerd and Calico
Node Configuration Table
Role
IP Address
master1
192.168.40.180
master2*
192.168.40.183
node1
192.168.40.181
node2*
192.168.40.182
*Nodes marked with an asterisk are reserved for future cluster expansion.
Prerequisites for All Node
Hostname Assignment
hostnamectl set-hostname master1 && bash # Run on master1
hostnamect ...
Posted on Tue, 19 May 2026 13:31:15 +0000 by yarons
Building a Kubernetes Cluster Using Docker with 100-Year Certificate Validity
Cluster Architecture
Provision three CentOS 7 instances with the following roles and specifications. The control plane node requires at least 2 vCPUs; otherwise, kubeadm initialization will fail.
Hostname
IP Address
Role
OS
Specs
ctrl-plane
192.168.10.10
Control Plane
CentOS 7
2 vCPU / 4 GiB
worker-1
192.168.10.11
Worker
CentOS 7
2 vCP ...
Posted on Fri, 08 May 2026 13:26:21 +0000 by dieselmachine