K8s使用Kubeadm搭建主从节点

布满荆棘的人生 2022-09-13 01:59 316阅读 0赞

一，环境规划

<table style="width:571px;"> 
 <tbody> 
  <tr> 
   <td style="width:189px;">环境Ip/hostname</td> 
   <td style="width:255px;">节点名称</td> 
   <td style="width:86px;">内存</td> 
  </tr> 
  <tr> 
   <td style="width:189px;">192.168.10.30/master.example.com</td> 
   <td style="width:255px;">master</td> 
   <td style="width:86px;">8G</td> 
  </tr> 
  <tr> 
   <td style="width:189px;">192.168.10.31/node01.example.com</td> 
   <td style="width:255px;">node01</td> 
   <td style="width:86px;">4G</td> 
  </tr> 
  <tr> 
   <td style="width:189px;">192.168.10.32/node02.example.com</td> 
   <td style="width:255px;">node02</td> 
   <td style="width:86px;">4G</td> 
  </tr> 
 </tbody> 
</table>

二，\#固定虚拟机Ip

cd /etc/sysconfig/net-script/xxx-enth  
修改dhcp->static  
DNS1="114.114.114.114"  
NETMASK="255.255.255.0"  
IPADDR="192.168.10.32"  
GATEWAY="192.168.10.1"  
service network restart

三，处理linux配置

\#暂时关闭关闭防火墙  
systemctl stop firewalld  
\#防止开机自启动   
systemctl disable firewalld

\#关闭selinux  
sed -i 's/^SELINUX=enforcing$/SELINUX=disabled/' /etc/sysconfig/selinux && setenforce 0

\#关闭swap  
swapoff -a

\#备份etc的fstab文件  
yes | cp /etc/fstab /etc/fstab\_20200918    
cat /etc/fstab\_20200918    
grep -v swap /etc/fstab\_20200918 >/etc/fstab   
cat /etc/fstab

\#处理内核参数  
vim /etc/sysctl.d/k8s.conf  
net.bridge.bridge-nf-call-ip6tables = 1  
net.bridge.bridge-nf-call-iptables = 1  
vm.swappiness = 0  
net.ipv4.ip\_forward = 1  
\#使配置生效  
modprobe br\_netfilter  
sysctl -p /etc/sysctl.d/k8s.conf

\#修改host  
vim /etc/hosts  
192.168.10.30 master.example.com  
192.168.10.31 node01.example.com  
192.168.10.32 node02.example.com

四，安装Docker

\#安装docker并设置开机自启动  
yum -y install docker  
systemctl enable docker  
vim /etc/sysconfig/docker  
selinux-enabled=false  
systemctl start docker && systemctl status docker

五，配置阿里的k8syum源并安装kubelet，kubeadm，kubectl

vim /etc/yum.repos.d/k8s.repo  
\[kubernetes\]  
name=Kubernetes  
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86\_64/  
enabled=1  
gpgcheck=0  
repo\_gpgcheck=0  
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

yum install -y kubelet-1.17.0 kubeadm-1.17.0 kubectl-1.17.0

六，查看资源依赖

kubeadm config images list

[root@master ~]# kubeadm config images list
    I0926 21:17:13.604398   41284 version.go:251] remote version is much newer: v1.22.2; falling back to: stable-1.17
    W0926 21:17:16.458405   41284 validation.go:28] Cannot validate kube-proxy config - no validator is available
    W0926 21:17:16.458464   41284 validation.go:28] Cannot validate kubelet config - no validator is available
    k8s.gcr.io/kube-apiserver:v1.17.17
    k8s.gcr.io/kube-controller-manager:v1.17.17
    k8s.gcr.io/kube-scheduler:v1.17.17
    k8s.gcr.io/kube-proxy:v1.17.17
    k8s.gcr.io/pause:3.1
    k8s.gcr.io/etcd:3.4.3-0
    k8s.gcr.io/coredns:1.6.5

七，启动kubelet

\#启动kubelet  
systemctl enable kubelet && systemctl start kubelet && systemctl status kubelet

八，安装资源

使用以下脚本pullK8sResources.sh

#!/bin/bash
    # 下面的镜像应该去除"k8s.gcr.io/"的前缀，版本换成kubeadm config images list命令获取到的版本
    images=(
        kube-apiserver:v1.17.17
        kube-controller-manager:v1.17.17
        kube-scheduler:v1.17.17
        kube-proxy:v1.17.17
        pause:3.1
        etcd:3.4.3-0
        coredns:1.6.5
    )
    
    for imageName in ${images[@]} ; do
        docker pull registry.aliyuncs.com/google_containers/$imageName
        docker tag registry.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
        #docker rmi registry.aliyuncs.com/google_containers/$imageName
    done

\#配置网络flannel  
docker pull quay.io/coreos/flannel:v0.11.0-amd64

注意以上步骤，master,node01,node02都需要执行。

九，初始化master

以下master节点  
\#初始化网络  
kubeadm init --pod-network-cidr=10.244.0.0/16 --image-repository registry.aliyuncs.com/google\_containers  
\#声明kubectl  
echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> /etc/profile   
source /etc/profile  
\#kubectl get nodes -> notready  
\#应用flannel  
curl https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml -o kube-flannel.yml  
kubectl apply -f kube-flannel.yml  
\#kubectl get nodes -> ready  
\#获取token  
kubeadm token list  
\#24小时过期生成token  
kubeadm token create  
\#获取discovery-token-ca-cert-hash  
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.\* //'

十，初始化nodes

kubeadm join 192.168.10.30:6443 --token ari48c.xxxxxxxxiqa \--discovery-token-ca-cert-hash sha256:69cf8b69b079b8xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx43b9