使用kubeadm 快速部署k8s

 

卸载之前的docker

sudo yum remove docker  docker-client docker-client-latest  docker-common  docker-latest  docker-latest-logrotate  docker-logrotate  docker-engine

yum remove  docker-ce docker-ce-cli containerd.io -y

 

 

 安装docker

sudo yum install -y yum-utils  device-mapper-persistent-data  lvm2
设置 docker repo 的 yum 位置
 sudo yum-config-manager  --add-repo  https://download.docker.com/linux/centos/docker-ce.repo

　　

yum - y install wget

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-18.06.1.ce-3.el7

systemctl enable docker && systemctl start docker

docker --version

Docker version 18.06.1-ce, build e68fc7a

 为docker配置加速

$ cat > /etc/docker/daemon.json << EOF
{
  "registry-mirrors": ["https://b9pmyelo.mirror.aliyuncs.com"]
}
EOF

　　

sudo systemctl daemon-reload

sudo systemctl restart docker

 配置开机启动

systemctl enable docker

 到这使用虚拟机备份，备份一下

添加阿里云YUM软件源

cat > /etc/yum.repos.d/kubernetes.repo << EOF
[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
EOF

　　

查看现在源中的版本

yum list|grep kube

然后执行

yum install -y kubelet-1.18.0 kubeadm-1.18.0 kubectl-1.18.0
systemctl enable kubelet
systemctl start kubelet

　　systemctl status kubelet

查看状态，是没启动的，不用管

接下来就是只在master节点执行

如果需要其他版本那么执行

kubeadm config images list --kubernetes-version=v1.18.0

查看版本需要的组件的版本然后修改脚本

#!/bin/bash

images=(
	kube-apiserver:v1.18.0
    kube-proxy:v1.18.0
	kube-controller-manager:v1.18.0
	kube-scheduler:v1.18.0
	coredns:1.6.7
	etcd:3.4.3-0
    pause:3.2
)

for imageName in ${images[@]} ; do
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
#   docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName  k8s.gcr.io/$imageName
done

　　把这个脚本通过ftp传到master节点进行执行

然后执行

或者

vim get_image.sh 

#!/bin/bash
url=registry.cn-hangzhou.aliyuncs.com/google_containers
version=v1.18.0
images=(`kubeadm config images list --kubernetes-version=$version|awk -F '/' '{print $2}'`)
for imagename in ${images[@]} ; do
  docker pull $url/$imagename
  docker tag $url/$imagename k8s.gcr.io/$imagename
  docker rmi -f $url/$imagename
done

　　这样就不需要查看版本了

 master节点执行

kubeadm init \
  --apiserver-advertise-address=10.0.2.15 \
  --image-repository registry.aliyuncs.com/google_containers \
  --kubernetes-version v1.18.0 \
  --service-cidr=10.96.0.0/12 \
  --pod-network-cidr=10.244.0.0/16

　　如果之前初始化没成功那么这里再执行应该会报错

error execution phase preflight: [preflight] Some fatal errors occurred:
	[ERROR FileAvailable--etc-kubernetes-manifests-kube-apiserver.yaml]: /etc/kubernetes/manifests/kube-apiserver.yaml already exists

　　执行

kubeadm reset

就可以了

然后再执行一遍kubeadm init的命令

fannel网络

 正常情况下网络访问不到

在https://www.ipaddress.com/查询raw.githubusercontent.com的真实IP。
sudo vim /etc/hosts
添加到最后一行
185.199.108.133  raw.githubusercontent.com

然后查看一下，应该就显示成功了coreDNS就不是pending状态了

kubectl get pods -n kube-system

　　

kubectl apply -f kube-flannel.yml

然后会看到初始化成功

Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 10.0.2.15:6443 --token ls6rzk.kmjrwpedv9qvsywe \
    --discovery-token-ca-cert-hash sha256:85256ca4826a6fb659ce83a583f0cd144bccd63cfc5255e6b17f2d47e31ce635

　　

然后按照命令行中输出的提示执行

mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config
$ kubectl get nodes

　　

 node加入

kubeadm join 10.0.2.15:6443 --token ls6rzk.kmjrwpedv9qvsywe \
    --discovery-token-ca-cert-hash sha256:85256ca4826a6fb659ce83a583f0cd144bccd63cfc5255e6b17f2d47e31ce635

　　

 

kubectl get pods -n kube-system

查看状态