Kubernetes technology--use kubeadm to build a highly available K8s cluster (close to the actual environment)

1. Highly available k8s cluster architecture (multi-master)

2. Installation hardware requirements

One or more machines, operating system CentOS7.x-86_x64

Hardware configuration: 2GB or more RAM, 2 CPUs or more, hard disk 30GB or more

Note:

This is a teaching environment, so three virtual machines are used for simulation.

3. Deployment planning

4. Preparation before deployment

(1). Turn off the firewall

systemctl stop firewalld
systemctl disable firewalld

(2). Close selinux

# 永久
sed -i 's/enforcing/disabled/' /etc/selinux/config 

# 临时
setenforce 0 

(3). Close swap

swapoff -a  # 临时
sed -ri 's/.*swap.*/#&/' /etc/fstab    # 永久

(4). Set the host name according to the plan

hostnamectl set-hostname <hostname&g