k8s-集群搭建的三种方式和区别，kubeadm、minikube，二进制包，镜像

https://blog.csdn.net/qq_21187515/article/details/101460039

1、用阿里云镜像

cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

2.安装 kubectl

参考：https://kubernetes.io/zh/docs/tasks/tools/install-kubectl/

使用本地包安装：

yum install -y kubectl

或

去 https://github.com/kubernetes/kubernetes/find/master 找CHANGELOG/CHANGELOG-1.xx.md

wget https://dl.k8s.io/v1.9.3/kubernetes-client-linux-amd64.tar.gz
tar -zxvf kubernetes-client-linux-amd64.tar.gz
cd kubernetes/client/bin
chmod +x ./kubectl
sudo mv ./kubectl /usr/local/bin/kubectl

3、运行 kubectl version，返回版本信息（有即可，其他报错忽略），说明安装成功

4、k8s中shell的自动补全

yum install bash-completion -y
echo "source <(kubectl completion bash)" >> ~/.bashrc

5、配置kubectl

参考：https://kubernetes.io/docs/tasks/access-application-cluster/configure-access-multiple-clusters/

Minikube 是一个轻量级的 Kubernetes 实现，会在本机创建一台虚拟机，并部署一个只包含一个节点的简单集群

6、提示缺少minikubectl，安装minkubectl

参考：https://yq.aliyun.com/articles/221687

curl -Lo minikube https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64 \
  && chmod +x minikube

如果直接下载不了，就去github下载，下载地址：https://github.com/kubernetes/minikube/releases/tag/v1.11.0

yum install conntrack
minikube start --image-mirror-country="cn" --image-repository="registry.cn-hangzhou.aliyuncs.com/google_containers" --driver=no
minikube status

minikube start --xx，有很多可选参数配置

防火墙开放端口

[root@localhost openssh]# firewall-cmd --list-ports

[root@localhost openssh]# firewall-cmd --zone=public --add-port=3338/tcp --permanent
success
[root@localhost openssh]# firewall-cmd --zone=public --add-port=23/tcp --permanent
success
[root@localhost openssh]# firewall-cmd --list-ports

[root@localhost openssh]# firewall-cmd --reload
success
[root@localhost openssh]# firewall-cmd --list-ports

无法直接在国内网络环境下从k8s.gcr.io下载镜像问题

docker pull mirrorgooglecontainers/kube-apiserver-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-controller-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-scheduler-amd64:v1.12.2
docker pull mirrorgooglecontainers/kube-proxy-amd64:v1.12.2
docker pull mirrorgooglecontainers/pause:3.1
docker pull mirrorgooglecontainers/etcd-amd64:3.2.24
docker pull mirrorgooglecontainers/coredns:1.2.2
docker pull mirrorgooglecontainers/coredns-amd64:1.2.2
docker pull coredns/coredns:1.2.2

改tag名

docker tag mirrorgooglecontainers/kube-proxy-amd64:v1.12.2 k8s.gcr.io/kube-proxy:v1.12.2
docker tag mirrorgooglecontainers/kube-apiserver-amd64:v1.12.2 k8s.gcr.io/kube-apiserver:v1.12.2
docker tag mirrorgooglecontainers/kube-controller-manager-amd64:v1.12.2 k8s.gcr.io/kube-controller-manager:v1.12.2
docker tag mirrorgooglecontainers/kube-scheduler-amd64:v1.12.2 k8s.gcr.io/kube-scheduler:v1.12.2
docker tag mirrorgooglecontainers/etcd-amd64:3.2.24 k8s.gcr.io/etcd:3.2.24
docker tag coredns/coredns:1.2.2 k8s.gcr.io/coredns:1.2.2
docker tag mirrorgooglecontainers/pause:3.1 k8s.gcr.io/pause:3.1

7.k8s使用测试

https://kubernetes.io/zh/docs/setup/learning-environment/minikube/

查看状态

kubectl get pod

报错查看：

kubectl describe pod

镜像拉取失败，替换镜像

docker pull cilium/echoserver
docker tag cilium/echoserver:latest k8s.gcr.io/echoserver:1.10

# 显式设置拉取策略为 IfNotPresent

$ kubectl run hello-minikube --image-pull-policy=IfNotPresent