安装docker环境

请参考 https://www.yuque.com/luoqiz/vcxnfs/yzow6q

机器配置

  1. #设置每个机器自己的hostname
  2. hostnamectl set-hostname xxx
  4. # 将 SELinux 设置为 permissive 模式（相当于将其禁用）
  5. sudo setenforce 0
  6. sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config
  8. #关闭swap
  9. swapoff -a  
  10. sed -ri 's/.*swap.*/#&/' /etc/fstab

虚拟机将桥接的IPV4流量传递到iptables链

#允许 iptables 检查桥接流量
cat <<EOF | sudo tee /etc/modules-load.d/k8s.conf
br_netfilter
EOF

cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sysctl --system

配置阿里云镜像源

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K8S组件

setenforce 0
sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

yum install -y kubelet-1.22.3 kubeadm-1.22.3 kubectl-1.22.3 –disableexcludes=kubernetes

sudo systemctl enable --now kubelet && sudo systemctl start kubelet

初始化K8S master节点

# 所有节点指明主节点域名、和主机名
echo "192.168.116.131  cluster-endpoint" >> /etc/hosts
echo "192.168.116.131  master.k8s" >> /etc/hosts
echo "192.168.116.132  node1.k8s" >> /etc/hosts
echo "192.168.116.133  node2.k8s" >> /etc/hosts


echo "主节点IP  主节点hostname" >> /etc/hosts
echo "worker节点IP  worker节点hostname" >> /etc/hosts

kubeadm init \
--apiserver-advertise-address 192.168.116.131 \
--control-plane-endpoint=cluster-endpoint \
--image-repository registry.aliyuncs.com/google_containers  \
--kubernetes-version v1.22.3 \
--service-cidr=10.96.0.0/16 \
--pod-network-cidr=10.244.0.0/16 \
--ignore-preflight-errors=Swap
  • —apiserver-advertise-address：指定master节点版本
  • —control-plane-endpoint：k8s域名解析主节点域名
  • —kubernetes-version：指定kubeadm版本
  • —pod-network-cidr：指定pod所属网络
  • —service-cidr：指定service网段 (此处因使用kube-flannel.yml，特设置10.244.0.0/16)
  • —ignore-preflight-errors=Swap/all：忽略 swap/所有 报错

若是出现[kubelet-check] It seems like the kubelet isn't running or healthy. 说明docker 服务未配置cgroupfs 可以参考 dockers 部署安装那一篇文章

K8S 安装成功后的提示信息

······
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/

You can now join any number of control-plane nodes by copying certificate authorities
and service account keys on each node and then running the following as root:

#######################  主节点加入 ###########################
  kubeadm join cluster-endpoint:6443 --token 1i2r1u.2w0u5zhhwon390zu \
        --discovery-token-ca-cert-hash sha256:b2be8c4fdd92d73b8aa43ad23ebf8ff0528348b2a8f4250637862e33e5a5c4d7 \
        --control-plane

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

#######################  worker点加入 ###########################

kubeadm join cluster-endpoint:6443 --token 1i2r1u.2w0u5zhhwon390zu \
        --discovery-token-ca-cert-hash sha256:b2be8c4fdd92d73b8aa43ad23ebf8ff0528348b2a8f4250637862e33e5a5c4d7

kubectl 对用户的配置

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

kubectl 测试

kubectl get nodes

其它节点加入命令 （root用户执行，24小时内有效）

kubeadm join cluster-endpoint:6443 --token 1i2r1u.2w0u5zhhwon390zu \
        --discovery-token-ca-cert-hash sha256:b2be8c4fdd92d73b8aa43ad23ebf8ff0528348b2a8f4250637862e33e5a5c4d7

#若是加入节点的 token 过期，则重新创建
kubeadm token create --print-join-command

部署pod网络插件

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

kubectl apply -f https://luoqiz-jdk.oss-cn-hongkong.aliyuncs.com/kube-flannel.yml
kubectl delete -f https://luoqiz-jdk.oss-cn-hongkong.aliyuncs.com/kube-flannel.yml

#更新docker源
kubectl apply -f https://luoqiz-jdk.oss-cn-hongkong.aliyuncs.com/kube-flannel-custom.yml

注意：此文件中需要的docker镜像从国外docker服务器下载，速度慢甚至无法下载。需要更新为国内源。具体修改信息访问：

https://blog.csdn.net/zsd498537806/article/details/85157560

一些相关命令

kubectl get nodes      #获取所有节点
kubectl get ns            #获取所有命名空间
kubectl get pods --all-namespaces     #获取所有命名空间的pods
watch kubectl get pod -n kube-system -o wide #监听其它节点的初始化
kubectl get all            # 查看系统内的所有资源
kubectl get all -o wide        #查看系统分配的资源信息

主节点安装可视化界面插件（在企业中目前没有见到使用这个的）

https://github.com/kubernetes/dashboard/releases

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml