K8S集群简易搭建版(未配证书, 配证书烦死人......)

默认已经安装好docker: docker安装请参考: Ubuntu安装Docker

关闭交换区

swap打开的情况下，kubelet无法正常运行

root@node01:~# sudo swapoff -a
root@node01:~# free -h
              total        used        free      shared  buff/cache   available
Mem:           3.5G        1.1G        672M        7.4M        1.8G        2.2G
Swap:            0B          0B          0B

安装K8S

vim /etc/apt/sources.list 添加阿里云镜像

deb http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ bionic-backports main restricted universe multiverse

apt-get update 更新apt源
下载K8S组件
```
sudo apt install -y kubelet kubeadm kubectl
```
- ps: 网络不好的话会下的比较久

启动kubelet

sudo systemctl enable kubelet && sudo systemctl start kubelet

安装完后查看版本

root@node01:~# kubelet --version
Kubernetes v1.17.3

master 节点初始化

由于kubeadm 默认从官网k8s.grc.io下载所需镜像，国内无法访问，因此需要通过–image-repository指定阿里云镜像仓库地址。

kubeadm init --image-repository registry.aliyuncs.com/google_containers --kubernetes-version v1.17.3 --pod-network-cidr=10.244.0.0/16

执行成功最终行会看到:

kubeadm join 192.168.180.130:6443 --token zwoa7g.rwd7nb16k3z8aygg 
    --discovery-token-ca-cert-hash sha256:5a214e1ca05b75aa88e9ace7691092f6159307cd727fa1306d48608a0a51b297

在其他主机上依次执行token join命令

查看集群所有节点:

root@node01:~# kubectl get nodes -o wide
NAME     STATUS   ROLES    AGE   VERSION   INTERNAL-IP       EXTERNAL-IP   OS-IMAGE             KERNEL-VERSION     CONTAINER-RUNTIME
node01   Ready    master   20h   v1.17.3   192.168.180.130   <none>        Ubuntu 18.04.2 LTS   5.3.0-42-generic   docker://19.3.8
node02   Ready    <none>   20h   v1.17.3   192.168.180.131   <none>        Ubuntu 18.04.2 LTS   5.3.0-42-generic   docker://19.3.8
node03   Ready    <none>   20h   v1.17.3   192.168.180.132   <none>        Ubuntu 18.04.2 LTS   5.3.0-42-generic   docker://19.3.8
node04   Ready    <none>   20h   v1.17.3   192.168.180.133   <none>        Ubuntu 18.04.2 LTS   5.3.0-42-generic   docker://19.3.8
node05   Ready    <none>   20h   v1.17.3   192.168.180.134   <none>        Ubuntu 18.04.2 LTS   5.3.0-42-generic   docker://19.3.8