K8S1.21集群搭建

ku1. 环境配置

（1）关闭防火墙

sudo systemctl disable firewalld
sudo systemctl stop firewalld

（2）关闭selinux

sudo setenforce 0
# 永久关闭 修改/etc/sysconfig/selinux文件设置
sudo sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux
sudo sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config

（3）禁用交换分区

sudo swapoff -a
# 永久禁用，打开/etc/fstab注释掉swap那一行。
sudo sed -i 's/.*swap.*/#&/' /etc/fstab

（4）修改内核参数

对于master节点：

sudo vim /etc/sysctl.d/k8s.conf
 
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
net.ipv6.conf.all.forwarding = 1
vm.swappiness = 0
 
sudo sysctl --system

对于node节点：

sudo vim /etc/sysctl.d/k8s.conf
 
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
 
sudo sysctl --system

验证是否生效，均返回 1 即正确：

sysctl -n net.bridge.bridge-nf-call-iptables 
sysctl -n net.bridge.bridge-nf-call-ip6tables

2. master节点环境准备

（1）安装kubeadm，kubectl，kubelet和部署镜像

#!/bin/sh
 
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
 
#安装kubeadm、kubelet、kubectl,注意这里默认安装当前最新版本v1.14.1:
yum install -y kubeadm-1.21.3-0 kubelet-1.21.3-0 kubectl-1.21.3-0
#yum install -y kubeadm kubelet kubectl
systemctl enable kubelet && systemctl start kubelet
 
 
# pull all images that k8s needs
ver=v1.21.3
registry=registry.cn-hangzhou.aliyuncs.com/google_containers
images=`kubeadm config images list --kubernetes-version=$ver |awk -F '/' '{print $2}'`
 
for image in $images
do
if [ $image != coredns ];then
    docker pull ${registry}/$image
    if [ $? -eq 0 ];then
        docker tag ${registry}/$image k8s.gcr.io/$image
        docker rmi ${registry}/$image
    else
        echo "ERROR: 下载镜像报错，$image"
    fi
else
    docker pull coredns/coredns:1.8.0
    docker tag coredns/coredns:1.8.0  k8s.gcr.io/coredns/coredns:v1.8.0
    docker rmi coredns/coredns:1.8.0
fi
done

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