K8s 环境准备

1 服务器要求

搭建K8s集群的最低硬件配置要求

节点类型	CPU	内存	磁盘
Master节点	2核+	2GB+	20GB+
Worker节点	1核+	1GB+	20GB+

2 系统初始化（所有节点）所有节点

配置主机名、关闭防火墙、禁用Swap等基础设置

# 设置主机名（每个节点不同）
hostnamectl set-hostname k8s-master
hostnamectl set-hostname k8s-worker1
hostnamectl set-hostname k8s-worker2

# 配置hosts（所有节点）
cat >> /etc/hosts << EOF
192.168.1.10 k8s-master
192.168.1.11 k8s-worker1
192.168.1.12 k8s-worker2
EOF

# 关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

# 关闭SELinux
setenforce 0
sed -i 's/enforcing/disabled/' /etc/selinux/config

# 关闭Swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab

# 配置内核参数
cat > /etc/sysctl.d/k8s.conf << EOF
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv4.ip_forward = 1
EOF
sysctl --system

3 安装Docker（所有节点）所有节点

K8s使用Docker作为容器运行时

# 安装Docker
wget https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo -O /etc/yum.repos.d/docker-ce.repo
yum -y install docker-ce-20.10.17-3.el7
systemctl enable docker && systemctl start docker

# 配置Docker使用systemd作为cgroup驱动
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": ["https://hub-mirror.c.163.com"]
}
EOF
systemctl restart docker