k8s部署出现的问题

/*
k8s部署参考:
https://www.hangge.com/blog/cache/detail_2414.html
https://latelee.blog.csdn.net/article/details/103774072

kubeadm init --kubernetes-version=v1.21.2 --pod-network-cidr=10.244.0.0/16 --service-cidr=10.96.0.0/12

出现的问题:
1.The connection to the server localhost:8080 was refused - did you specify the right host or port?
解决方法:
master :
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

node节点:
cp master节点$HOME/.kube/config文件到node节点$HOME/.kube/config

2.flannel文件地址:
https://github.com/flannel-io/flannel/blob/master/Documentation/kube-flannel.yml
https://github.com/lei-all/flannel.yaml/blob/master/kube-flannel.yml

3.coedns出现system:coredns 无法list endpointslices,将endpointslices权限加上即可
*/

apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: system:coredns
rules:
- apiGroups:
  - ""
  resources:
  - endpoints
  - services
  - pods
  - namespaces
  verbs:
  - list
  - watch
- apiGroups:
  - ""
  resources:
  - nodes
  verbs:
  - get
- apiGroups:
  - "discovery.k8s.io"
  resources:
  - endpointslices
  verbs:
  - list
  - get
  - watch

4.配置tab自动补全：
	1.安装bash-completion
	[root@master bin]# yum install bash-completion -y

	2.执行bash_completion
	[root@master bin]# source /usr/share/bash-completion/bash_completion

	3.重新加载kubectl completion
	[root@master bin]# source <(kubectl completion bash)

	4.就能用tab补全命令了
	[root@master bin]# kubectl create clusterrolebinding

 

没安装bash-completion就会报错

source <(kubectl completion bash)
运行kubectl tab时出现以下报错

[root@master bin]# kubectl c-bash: _get_comp_words_by_ref: command not found

5.kubeadm reset
ifconfig cni0 down
ip link delete cni0
ifconfig flannel.1 down
ip link delete flannel.1
rm /var/lib/cni/ -rf
rm /etc/kubernetes/ -rf
rm /var/lib/kubelet/ -rf 
rm $HOME/.kube/config -rf

token get:
https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm-token/
kubeadm token create --print-join-command

#kubeadm config images list
images=(
    kube-apiserver:v1.21.2
    kube-controller-manager:v1.21.2
    kube-scheduler:v1.21.2
    kube-proxy:v1.21.2
    pause:3.4.1
    etcd:3.4.13-0
    coredns/coredns:1.8.0
)

for imageName in ${images[@]} ; do
    docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
    docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName k8s.gcr.io/$imageName
    docker rmi registry.cn-hangzhou.aliyuncs.com/google_containers/$imageName
docker pull registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.8.0
docker tag registry.cn-hangzhou.aliyuncs.com/google_containers/coredns:1.8.0 coredns/coredns:v1.8.0


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