Server Preparations #

This section documents the tasks required for the server preparation stage.

Information #

Preparation requirements:

• 3 Linux servers; here, we are using Rocky Linux 8.
• 3 IP addresses on the same subnet, assigned to these servers.

The planned setup is as follows:

Server Preparations #

1. Set hostnames

hostnamectl set-hostname master

hostnamectl set-hostname node01

hostnamectl set-hostname node02

Edit /etc/hosts so that the servers can be accessed with hostnames

# /etc/hosts

192.168.56.10 master
192.168.56.11 node01
192.168.56.12 node02

Set timezone.

timedatectl set-timezone <YOUR_TIMEZONE>

timedatectl set-timezone <YOUR_TIMEZONE>

timedatectl set-timezone <YOUR_TIMEZONE>

Install some useful command line tools.

# master: openssl
dnf install -y wget vim openssl

# node: some tools that may be useful
dnf install -y wget vim socat conntrack ipset

# node: some tools that may be useful
dnf install -y wget vim socat conntrack ipset

Disable SWAP and SELinux

# Do this on all three nodes.

vim /etc/fstab
vim /etc/selinux/config

Enable ip_forward (so that the nodes can forward packets to pods.)

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.conf
sysctl -p

Create folders for config and certs.

mkdir /etc/kubernetes       # config
mkdir /etc/kubernetes/pki   # certs and keys

mkdir /etc/kubernetes       # config
mkdir /etc/kubernetes/pki   # certs and keys

mkdir /etc/kubernetes       # config
mkdir /etc/kubernetes/pki   # certs and keys

Notes on Networking #

Run ip addr on each hosts.

• If only lo and eth0 are displayed on your machine, then for this configuration, your primary network interface is eth0.

• If you have more than these two network interfaces, you are likely using a virtual machine on your computer:

  • If you are using VirtualBox, you may see a NAT network and a Host-only network: the NAT network is for internet access to download resources, while the Host-only network allows interconnection between virtual machines. In this case, the primary network interface is the Host-only interface, which will handle communication between the Kubernetes Nodes.

It’s recommended to ping each server from the others to ensure inter-node connectivity.

Next: K8s certificates and keys。