k8s在centos的安装

记录下kubernetes的安装

环境准备
3台电脑
配置: cpu 核心2 node 内存4G master 内存2G
IP:
master : 192.168.10.82
node1:192.168.10.83
node2:192.168.10.84
安装前的准备
学习k8s，我相信这点linux基础还是有的，就不做演示了
1.配置静态ip
2.关闭swap分区
3.ssh免密登录
4.配置DNS，可以上公网
5.修改主机名
6.安装docker
7.修改/etc/hosts，添加三台主机的信息
8.关闭防火墙和selinux
9.同步时间和时区
10.安装三个kubernetes工具
kubelet kubeadm kubectl
图片是我从阿里开源镜像站截的，看不清可以去链接
三个工具下载教程链接

配置方法
kubeadm是k8s的集群安装工具，能快速安装k8s集群。

安装k8s主要是安装它的各个镜像，由于国内的网络原因，无法拉取镜像，修改为阿里云的镜像服务即可解决
1.创建并修改配置文件
（1）导出配置文件

kubeadm config print init-defaults --kubeconfig    ClusterConfiguration > kubeadm.yml

（2）修改配置文件：

apiVersion: kubeadm.k8s.io/v1beta2
bootstrapTokens:
- groups:
  - system:bootstrappers:kubeadm:default-node-token
  token: abcdef.0123456789abcdef
  ttl: 24h0m0s
  usages:
  - signing
  - authentication
kind: InitConfiguration
localAPIEndpoint:
  advertiseAddress: 192.168.10.82   #改为主节点ip  
  bindPort: 6443
nodeRegistration:
  criSocket: /var/run/dockershim.sock
  name: node82
  taints:
  - effect: NoSchedule
    key: node-role.kubernetes.io/master
---
apiServer:
  timeoutForControlPlane: 4m0s
apiVersion: kubeadm.k8s.io/v1beta2
certificatesDir: /etc/kubernetes/pki
clusterName: kubernetes
controllerManager: {}
dns:
  type: CoreDNS
etcd:
  local:
    dataDir: /var/lib/etcd
imageRepository: registry.aliyuncs.com/google_containers    #修改为阿里云镜像地址
kind: ClusterConfiguration
kubernetesVersion: v1.17.0        
networking:
  dnsDomain: cluster.local
  podSubnet: "10.244.0.0/16"      #添加Pod网段 
  serviceSubnet: 10.96.0.0/12
scheduler: {}

3. 执行以下命令可查看镜像信息

kubeadm config images list --config kubeadm.yml

4. 下载主节点镜像

 kubeadm config images pull --config kubeadm.yml

5. 安装初始化主节点

kubeadm init --config=kubeadm.yml    | tee kubeadm-init.log

6. 初始化完成会显示以下信息，

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

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 192.168.10.82:6443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4611916f24b31843d3a167965c228d728f7e1422767001d7703b4c2368ea132f   

9。 root用户执行以下两条命令

 mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config  ） 

非root执行完以上命令后执行

sudo chown $(id -u):$(id -g) $HOME/.kube/config 

到此初始化完成

10。node节点执行以下命令加入节点

kubeadm join 192.168.10.82:6443 --token abcdef.0123456789abcdef \
    --discovery-token-ca-cert-hash sha256:4611916f24b31843d3a167965c228d728f7e1422767001d7703b4c2368ea132f   

11. 执行以下命令可查看到节点

  kubectl get node

12.至此安装完成