centos8 部署k8s

yum -y install nginx 
vi /etc/nginx/conf.d/vhost.conf
server {
        listen       80;
        server_name  192.168.140.101;
        location / {
            proxy_pass http://127.0.0.1:8001;
            proxy_set_header Host $proxy_host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Via "nginx";
        }   
}

systemctl enable nginx
systemctl start nginx

本机浏览器输入

http://192.168.140.101/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/#/login

访问dashboard

一、Kubernetes集群部署方式

方式1. minikube

Minikube是一个工具，可以在本地快速运行一个单点的Kubernetes，尝试Kubernetes或日常开发的用户使用。不能用于生产环境。
官方地址：https://kubernetes.io/docs/setup/minikube/

方式2. kubeadm

Kubeadm也是一个工具，提供kubeadm init和kubeadm join，用于快速部署Kubernetes集群。
官方地址：https://kubernetes.io/docs/reference/setup-tools/kubeadm/kubeadm/

方式3. 直接使用epel-release yum源，缺点就是版本较低 1.5

方式4. 二进制包

从官方下载发行版的二进制包，手动部署每个组件，组成Kubernetes集群。

其他的开源工具：

https://docs.kubeoperator.io/kubeoperator-v2.2/introduction

二、Kubeadm部署k8s集群

官方文档：

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/install-kubeadm/

kubeadm部署k8s高可用集群的官方文档：

https://kubernetes.io/docs/setup/production-environment/tools/kubeadm/high-availability/

1 安装centos8系统，配置固定IP

2 配置基本系统

　

swapoff -a  去掉Swap分区
yum -y remove firewalld
yum -y install iptables-services

sed -i 's/SELINUX=permissive/SELINUX=disabled/' /etc/sysconfig/selinux

cat <<EOF | sudo tee /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF
sudo sysctl --system

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo

cat <<EOF | sudo tee /etc/yum.repos.d/kubernetes.repo

[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg

EOF

# Set SELinux in permissive mode (effectively disabling it)
setenforce 0

wget https://download.docker.com/linux/centos/docker-ce.repo
yum -y install epel-release

yum makecache

yum install docker-ce docker-ce-cli containerd.io

yum install -y kubelet kubeadm kubectl ipvsadm

　　

 更新镜像

[root@master ~]# kubeadm config images list
k8s.gcr.io/kube-apiserver:v1.20.1
k8s.gcr.io/kube-controller-manager:v1.20.1
k8s.gcr.io/kube-scheduler:v1.20.1
k8s.gcr.io/kube-proxy:v1.20.1
k8s.gcr.io/pause:3.2
k8s.gcr.io/etcd:3.4.13-0
k8s.gcr.io/coredns:1.7.0


使用docker pull拉取镜像

　　安装初始化

kubeadm init　　

安装flannel网络管理插件

github

https://github.com/coreos/flannel

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/kube-flannel.yml

安装dashboard进行管理

https://github.com/kubernetes/dashboard

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.1.0/aio/deploy/recommended.yaml
kubectl proxy

　运行成功后为了进行网页管理 我装了nginx来转发,kubectl proxy监听本地的127.0.0.1:8001端口,使用ngix转发以便从实际IP访问管理

 创建dashboard登录帐号：

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kubernetes-dashboard
EOF

把帐号与集群角色绑定

cat <<EOF | kubectl apply -f -
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kubernetes-dashboard
EOF

 获取登录的token

kubectl -n kubernetes-dashboard describe secret $(kubectl -n kubernetes-dashboard get secret | grep admin-user | awk '{print $1}')

获取的TOKEN粘贴到登录界面就可以登录了

手动安装方式（我更喜欢，可以了解整个流程）

下载etcd安装程序  https://github.com/etcd-io/etcd

下载K8S安装程序，从https://kubernetes.io/docs/setup/release/notes/ 下载

解压后到cluster目录下，运行下载编译好的最新版本的k8s程序

[root@localhost cluster]# sh get-kube-binaries.sh 
Kubernetes release: v1.20.0
Server: linux/amd64  (to override, set KUBERNETES_SERVER_ARCH)
Client: linux/amd64  (autodetected)  (to override, set KUBERNETES_CLIENT_OS and/or KUBERNETES_CLIENT_ARCH)

Will download kubernetes-server-linux-amd64.tar.gz from https://dl.k8s.io/v1.20.0
Will download and extract kubernetes-client-linux-amd64.tar.gz from https://dl.k8s.io/v1.20.0
Is this ok? [Y]/n