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Installation/Installation Kubernetes-Cluster.md
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# Install instructions for a 3-Node Kubernetes Cluster # Install instructions for a 3-Node Kubernetes Cluster
## Prerequisites ## Prerequisites
Minimal Installed Debian 12/11, 2 CPU / vCPU, 2 GB RAM, 20 GB free disk space, Sudo User with Admin rights, Stable Internet Connectivity Minimal Installed Debian 12/11 \
2 CPU / vCPU, 2 GB RAM \
20 GB free disk space \
Sudo User with Admin rights \
Stable Internet Connectivity
Ensure that each node can communicate with the others via a reliable network connection. Ensure that each node can communicate with the others via a reliable network connection.
## Lab Setup ## Lab Setup
For the demonstration, I am using three Debian 12 systems. For the demonstration, I am using three Debian 12 systems.
Master Node (vmcon-master.his.de) – 192.168.202.10 Master Node (vmcon-master.his.de) – 192.168.202.10 \
Worker Node 1 (vmcon-node1.his.de) – 192.168.202.11 Worker Node 1 (vmcon-node1.his.de) – 192.168.202.11 \
Worker Node 2 (vmcon-node2.his.de) – 192.168.202.12 Worker Node 2 (vmcon-node2.his.de) – 192.168.202.12
@@ -24,32 +28,32 @@ $ hostnamectl set-hostname "vmcon-node2.his.de" // Run on 2nd worker node
Also add the following entries in /etc/hosts file on all the nodes, Also add the following entries in /etc/hosts file on all the nodes,
192.168.202.10 vmcon-master.his.de vmcon-master.his.de 192.168.202.10 vmcon-master.his.de vmcon-master.his.de \
192.168.202.11 vmcon-node1.his.de vmcon-node1 192.168.202.11 vmcon-node1.his.de vmcon-node1 \
192.168.202.12 vmcon-node2.his.de vmcon-node2 192.168.202.12 vmcon-node2.his.de vmcon-node2
## Disable Swap on All Nodes ## Disable Swap on All Nodes
For kubelet to work smoothly, it is recommended to disable swap. Run following commands on master and worker nodes to turn off swap. For kubelet to work smoothly, it is recommended to disable swap. Run following commands on master and worker nodes to turn off swap.
$ swapoff -a >$ swapoff -a \
$ sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab $ sed -i '/ swap / s/^\(.*\)$/#\1/g' /etc/fstab
## Add Firewall Rules for Kubernetes Cluster ## Add Firewall Rules for Kubernetes Cluster
In case, OS firewall is enabled on your Debian systems then allow following ports on master and worker nodes respectively. In case, OS firewall is enabled on your Debian systems then allow following ports on master and worker nodes respectively.
On Master node, run On Master node, run
$ ufw allow 6443/tcp >$ ufw allow 6443/tcp \
$ ufw allow 2379/tcp $ ufw allow 2379/tcp \
$ ufw allow 2380/tcp $ ufw allow 2380/tcp \
$ ufw allow 10250/tcp $ ufw allow 10250/tcp \
$ ufw allow 10251/tcp $ ufw allow 10251/tcp \
$ ufw allow 10252/tcp $ ufw allow 10252/tcp \
$ ufw allow 10255/tcp $ ufw allow 10255/tcp \
$ ufw reload $ ufw reload
On Worker Nodes, On Worker Nodes,
$ ufw allow 10250/tcp >$ ufw allow 10250/tcp \
$ ufw allow 30000:32767/tcp $ ufw allow 30000:32767/tcp \
$ ufw reload $ ufw reload
Note: If firewall is disabled on your Debian 12/11 systems, then you can skip this step. Note: If firewall is disabled on your Debian 12/11 systems, then you can skip this step.