k8s-集群搭建

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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。

k8s-集群搭建

报错

k8s-集群搭建

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

k8s-集群搭建

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

k8s-集群搭建

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

k8s-集群搭建