k8s-集群搭建

kubernetes 修炼手册书籍整理:

kubernetes安装方式

  1、测试用练习环境

  2、托管的kubernetes

       3、自定义安装。

 

  1、测试用练习环境 

  Magic Sandbox平台

       Play with Kubernetes 平台(https://labs.play-with-k8s.com/

 

 kubeadm reset:清理之前的集群配置。这个命令会移除网络配置并恢复主机到初始状态。

初始化操作

  kubeadm init --kubernetes-version=1.19.3 --apiserver-advertise-address=192.168.137.128 --image-repository registry.aliyuncs.com/google_containers --service-cidr=10.1.0.0/16 --pod-network-cidr=10.244.0.0/16

初始化后出现以下界面即表示成功。

 报错

 

解决方法:禁用 Swap

临时禁用

sudo swapoff -a

永久禁用

/dev/mapper/your-swap-partition none swap sw 0 0

报错

关闭之后启动kubelet

systemctl start kubelet

 解决方法:更改主机名

 hostnamectl set-hostname node1

  加入集群

[root@master ~]#     kubeadm join 192.168.72.123:6443 --token oindpm.wprzpeacsxlznslb     --discovery-token-ca-cert-hash sha256:9a9a59592a5bd5a819ef5008ecc37681b7e7a4c6857171b6ab112e4221efd8ac
[preflight] Running pre-flight checks
    [WARNING IsDockerSystemdCheck]: detected "cgroupfs" as the Docker cgroup driver. The recommended driver is "systemd". Please follow the guide at https://kubernetes.io/docs/setup/cri/
[preflight] Reading configuration from the cluster...
[preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'
[kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml"
[kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env"
[kubelet-start] Starting the kubelet
[kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...

This node has joined the cluster:
* Certificate signing request was sent to apiserver and a response was received.
* The Kubelet was informed of the new secure connection details.

Run 'kubectl get nodes' on the control-plane to see this node join the cluster.

出现上面的kubectl get nodes 即表示加入成功

如果出现下面错误: 

[root@bogon kubeblog]# kubectl get nodes
The connection to the server localhost:8080 was refused - did you specify the right host or port?

 则需要执行下面代码

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

问题:

集群节点重启后导致节点NotReady状态且kubelet无法启动

 解决方法:关闭swap(这种问题是由于之前是手动关闭的但是没有在/etc/fstab文件中关闭swap)

 swapoff -a 关闭swap

在/etc/fstab文件中注释掉swap相关配置

 

慕课网整理:

部署目标

在所有节点上安装Docker和kubeadm,kubelet

部署容器网络插件flannel

安装基础软件

   1、配置Master和work节点的域名

   2、CPU设置为2核

   3、下载阿里云的yum源repo文件

         curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

   4、安装基础软件包

         yum install wget net-tools ntp git ‐y

   5、同步系统时间

        ntpdate 0.asia.pool.ntp.org

   6、配置docker、k8s的yum源

   7、确保br_netfilter模块被加载

   8、将桥接的IPv4流量传递到iptables

posted @ 2023-09-21 15:30  ~技术小白  阅读(11)  评论(0编辑  收藏  举报