kubernetes-kubernetes的部署

k8s部署

准备：3台node服务器IP分别为(192.168.2.18-192.168.2.20)，1台master服务器IP为192.168.2.21，并安装好docker。
步骤：
配置docker使用systemd作为默认驱动

1. 安装docker

yum install yum-utils -y
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io

2. 修改主机名

 hostnamectl set-hostname master
 hostnamectl set-hostname node1
 hostnamectl set-hostname node2
 hostnamectl set-hostname node3

3. 配置docker使用systemd作为默认驱动

cat <<EOF> /etc/docker/daemon.json
{
"exec-opts":["native.cgroupdriver=systemd"]
}
EOF

#设置开机自启动
systemctl enable docker
#重启docker
systemctl restart docker
#查看驱动
docker info | grep Cgroup

4. 关闭swap分区

#临时关闭所有swap分区
swapoff -a
#永久关闭swap分区，注释/ext/fstab/的/dev/mapper/centos-swap
sed -i '/swap/s/^\(.*\)$/#\1/g' /etc/fstab
#查看是否注释
cat /etc/fstab

5. 修改host文件

cat >>/etc/hosts <<EOF
192.168.2.21 master
192.168.2.18 node1
192.168.2.19 node2
192.168.2.20 node3
EOF

6. 配置Kubernetes的yum仓库

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=1
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

7. 安装kubelet，kubeadm，kubectl

yum install -y kubelet-1.23.6 kubeadm-1.23.6 kubectl-1.23.6
systemctl enable kubelet

8. 部署Kubernetes Master

#拉取coredns镜像并改名
docker pull coredns/coredns
docker tag coredns/coredns registry.aliyuncs.com/google_containers/coredns

kubeadm init \
--apiserver-advertise-address 192.168.2.21 \
--image-repository registry.aliyuncs.com/google_containers \
--pod-network-cidr=10.244.0.0/16 \
--service-cidr=10.1.0.0/16 

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 192.168.2.21:6443 --token 4dfgko.5lxgvyzrrqe4nocg \
	--discovery-token-ca-cert-hash sha256:9465be0cc03d900c6ef26ab8271c428b9ffc42939e12114e0da7a8703ee457d5 

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

9. node节点加入集群

建议不要在node节点运行kublet服务，不然会导致join失败，如果已经运行，建议执行kubeadm reset然后删除提示的文件和目录。

所有node运行命令：

kubeadm join 192.168.2.21:6443 --token 4dfgko.5lxgvyzrrqe4nocg \
	--discovery-token-ca-cert-hash sha256:9465be0cc03d900c6ef26ab8271c428b9ffc42939e12114e0da7a8703ee457d5

默认token有效期为24小时，当过期之后，该token就不可用了。这时就需要重新创建token，可以直接使用命令快捷生成：

kubeadm token create --print-join-command

10. 安装网络插件flannel

kubectl apply -f kube-flannel.yml
查看nodes信息
​```shell
[root@master ~]# kubectl get nodes
NAME     STATUS   ROLES                  AGE     VERSION
master   Ready    control-plane,master   122m    v1.23.6
node1    Ready    <none>                 107m    v1.23.6
node2    Ready    <none>                 100m    v1.23.6
node3    Ready    <none>                 2m40s   v1.23.6