kubeadm部署kubernetes-v1.15.0集群

• kubernetes架构图

  
  架构图

• 部署环境

  • OS：CentOS Linux release 7.6.1810 (Core)
  • kernel： 3.10.0-957.21.3.el7.x86_64
  • iptables\selinux 关闭
  • 1 master 2 node

• repo环境准备

  • Centos_repo
    wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
  • docker_repo
    wget http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
  • kubernetes_repo

  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

  所有设备均执行如下命令
  yum install -y kubelet kubeadm kubectl docker-ce
  systemctl enable docker kubelet
  

  • 下载所需docker镜像

  这里下载v1.15.0版本   
  docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.15.0
  docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.15.0
  docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.10.0
  docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.15.0
  docker pull mirrorgooglecontainers/pause:3.1
  docker pull mirrorgooglecontainers/etcd:3.3.10
  docker pull coredns/coredns:1.3.1
  
  镜像打标
  docker tag  mirrorgooglecontainers/kube-apiserver-amd64:v1.15.0 k8s.gcr.io/kube-apiserver:v1.15.0
  docker tag  mirrorgooglecontainers/kube-scheduler:v1.15.0 k8s.gcr.io/kube-scheduler:v1.15.0
  docker tag  mirrorgooglecontainers/kube-controller-manager:v1.15.0 k8s.gcr.io/kube-controller-manager:v1.15.0
  docker tag  mirrorgooglecontainers/etcd:v1.15.0 k8s.gcr.io/etcd:v1.15.0
  docker tag  mirrorgooglecontainers/etcd:3.3.10 k8s.gcr.io/etcd:3.3.10
  docker tag  mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1
  docker tag  coredns/coredns:1.3.1 k8s.gcr.io/coredns:1.3.1
  
  镜像分发打包
  docker save -o k8s-master.tar.gz  `docker image ls |grep k8s |awk '{position=$1":"$2;print $1,position}' |awk '{print $2}'`
  
  导入镜像
  [root@master ~]# docker load -i k8s-master.tar.gz 
  Loaded image: k8s.gcr.io/etcd:3.3.10
  Loaded image: k8s.gcr.io/pause:3.1
  Loaded image: k8s.gcr.io/kube-proxy:v1.15.0
  Loaded image: k8s.gcr.io/kube-apiserver:v1.15.0
  Loaded image: k8s.gcr.io/kube-controller-manager:v1.15.0
  Loaded image: k8s.gcr.io/kube-scheduler:v1.15.0
  Loaded image: k8s.gcr.io/coredns:1.3.1
  
  

  • 初始化master

  docker 服务器开启
  [root@master ~]# systemctl start docker
  
  忽略swap报错
  [root@master ~]# vim /etc/sysconfig/kubelet
  KUBELET_EXTRA_ARGS="--fail-swap-on=false"
  
  安装
  kubeadm  init --pod-network-cidr=10.244.0.0/16  --ignore-preflight-errors=Swap
  #10.244.0.0/16为pod网络  server网络默认为10.96.0.0/12
  
  kubectl 客户端用户配置文件配置
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
  
  记录安装后输出，供后面添加work-node使用
  kubeadm join 10.193.116.83:6443 --token cmpc1v.bxbssutot9uwn3go \
  --discovery-token-ca-cert-hash sha256:a6206427396768bf14a9bb85bf3d726ad5441ccd646a3949ece417b1607a2c2b 
  
  安装flannel网络
  kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml
  

  • 添加work-node

  work-node节点需要 kube-proxy和flanner即可，打包所需镜像
  docker save -o k8s-node.tar.gz  quay.io/coreos/flannel:v0.11.0-amd64 \
  k8s.gcr.io/pause:3.1 k8s.gcr.io/kube-proxy:v1.15.0
  
  在work-node节点上load镜像
  [root@node1 ~]# docker load -i k8s-node.tar.gz 
  
  加入master
  [root@node1 ~]# kubeadm join 10.193.116.83:6443 --token cmpc1v.bxbssutot9uwn3go \
  --discovery-token-ca-cert-hash sha256:a6206427396768bf14a9bb85bf3d726ad5441ccd646a3949ece417b1607a2c2b
  

• 查看集群状态

[root@master ~]# kubectl get nodes
NAME     STATUS   ROLES    AGE     VERSION
master   Ready    master   7h57m   v1.15.0
node1    Ready    <none>   5h42m   v1.15.0
node2    Ready    <none>   141m    v1.15.0