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删除 Kubernetes 旧版本，安装 Kubernetes 1.21.5。

必备安装

每台服务器都需要

root 登录

su - root

设置时区

timedatectl set-timezone Asia/Shanghai

设置主机名

hostnamectl set-hostname new-hostname

安装 Docker-CE

apt-get -y update
apt-get -y install apt-transport-https ca-certificates curl software-properties-common

# 安装GPG证书
curl -fsSL https://mirrors.aliyun.com/docker-ce/linux/ubuntu/gpg | apt-key add -

# 写入软件源信息
add-apt-repository "deb [arch=amd64] https://mirrors.aliyun.com/docker-ce/linux/ubuntu $(lsb_release -cs) stable"

# 更新并安装
apt-get -y update
apt-get -y install docker-ce docker-ce-cli containerd.io

设置 Docker 的 cgroupDriver=systemd

# vim /lib/systemd/system/docker.service
ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd

重启服务

systemctl daemon-reload
systemctl restart docker

安装 Kubernetes

# 安装GPG证书
curl https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg | apt-key add - 

# 写入软件源信息
cat <<EOF >/etc/apt/sources.list.d/kubernetes.list
deb https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main
EOF

# 更新并安装
apt-get -y update
apt-get -y install kubelet=1.21.5-00 kubeadm=1.21.5-00 kubectl=1.21.5-00

清理集群

清理 Worker 节点

kubectl drain <node name> --delete-emptydir-data --force --ignore-daemonsets

在每台 Worker 节点上重置

kubeadm reset -f

删除 Worker 节点

kubectl delete node <node name>

清理控制平面

kubeadm reset -f

删除旧版本 Kubernetes

apt-get -y remove --purge kubelet kubeadm kubectl
rm -rf /etc/systemd/system/kubelnet.service.d

Master 节点

安装控制平面

kubeadm init --kubernetes-version=1.21.5 --image-repository=registry.aliyuncs.com/google_containers

......
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

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

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 172.16.33.157:6443 --token 1b4d4t.mkcxrylj4ncdhpi7 \
	--discovery-token-ca-cert-hash sha256:c08b680766b950e7d26dde4b301163283b349280dd0448f45da4550aae8438f8

安装 Weave Net 支持集群网络

kubectl apply -f "https://cloud.weave.works/k8s/net?k8s-version=$(kubectl version | base64 | tr -d '\n')"

Worker 节点加入集群

在每台 Worker 服务器上运行

kubeadm join 172.16.33.157:6443 --token 1b4d4t.mkcxrylj4ncdhpi7 \
	--discovery-token-ca-cert-hash sha256:c08b680766b950e7d26dde4b301163283b349280dd0448f45da4550aae8438f8 

......
This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

控制平面下查看集群中的节点

root 用户下设置

export KUBECONFIG=/etc/kubernetes/admin.conf

其它用户下设置

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

查看集群中的节点

kubectl get nodes

NAME   STATUS   ROLES                  AGE     VERSION
cpu1   Ready    control-plane,master   4h14m   v1.21.5
cpu2   Ready    <none>                 22m     v1.21.5
cpu3   Ready    <none>                 10m     v1.21.5
cpu4   Ready    <none>                 110s    v1.21.5
gpu1   Ready    <none>                 14s     v1.21.5

参考资料

Updated: