使用minikube 构建k8s集群(1)

操作系统准备

在开始构建k8s集群之前，我们选取centos7作为操作系统，最小化安装。

yum update -y
yum upgrade -y
yum install net-tools bridge-utils vim
sed -i "s/enforing/disabled/g" /etc/selinux/config
setenforce 0
getenforce
swapoff -a
sed -i "s/^\/dev\/mapper\/centos-swap/#\/dev\/mapper\/centos-swap/g" /etc/fstab

设置静态网络

修改配置文件/etc/sysconfig/network-scripts/ifcfg-ens33

#BOOTPROTO="dhcp"
#IPV6_ADDR_GEN_MODE="stable-privacy"
#ONBOOT="no"

BOOTPROTO=static
ONBOOT=yes
IPADDR=192.168.65.179
NETMASK=255.255.255.0
GATEWAY=192.168.65.2
DNS1=114.114.114.114

systemctl restart network

安装docker

yum install -y yum-utils
yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
yum install docker-ce docker-ce-cli containerd.io
systemctl restart docker

安装Golang

由于我们需要使用golang，所以安装一下比较新的版本1.16.5，并且设置国内proxy

yum install wget
wget https://studygolang.com/dl/golang/go1.16.5.linux-amd64.tar.gz
tar vzxf go1.16.5.linux-amd64.tar.gz
// .bashrc
export GOROOT=/root/go
export GOPATH=/root/gopath
export PATH=$GOROOT/bin:$GOPATH/bin:$PATH

go env -w GOPROXY=https://goproxy.cn

安装git

yum install git

安装Minikube

// 根据gopath安装
git clone --branch v1.21.0  https://github.com/kubernetes/minikube.git
git clone https://github.com/go-bindata/go-bindata.git
yum install gcc
make -j4 linux
cp out/minikube-linux-amd64 /usr/local/bin/minikube

准备镜像

docker pull registry.aliyuncs.com/google_containers/kube-apiserver:v1.20.7
docker pull registry.aliyuncs.com/google_containers/kube-controller-manager:v1.20.7
docker pull registry.aliyuncs.com/google_containers/kube-scheduler:v1.20.7
docker pull registry.aliyuncs.com/google_containers/kube-proxy:v1.20.7
docker pull registry.aliyuncs.com/google_containers/pause:3.2
docker pull registry.aliyuncs.com/google_containers/etcd:3.4.13-0
docker pull registry.aliyuncs.com/google_containers/coredns:1.7.0
docker tag registry.aliyuncs.com/google_containers/kube-apiserver:v1.20.7 k8s.gcr.io/kube-apiserver:v1.20.7
docker tag registry.aliyuncs.com/google_containers/kube-controller-manager:v1.20.7 k8s.gcr.io/kube-controller-manager:v1.20.7
docker tag registry.aliyuncs.com/google_containers/kube-scheduler:v1.20.7 k8s.gcr.io/kube-scheduler:v1.20.7
docker tag registry.aliyuncs.com/google_containers/kube-proxy:v1.20.7 k8s.gcr.io/kube-proxy:v1.20.7
docker tag registry.aliyuncs.com/google_containers/pause:3.2 k8s.gcr.io/pause:3.2
docker tag registry.aliyuncs.com/google_containers/etcd:3.4.13-0 k8s.gcr.io/etcd:3.4.13-0
docker tag registry.aliyuncs.com/google_containers/coredns:1.7.0 k8s.gcr.io/coredns:1.7.0

docker pull zengjie19/gcr.io-k8s-minikube-storage-provisioner:v5
docker tag zengjie19/gcr.io-k8s-minikube-storage-provisioner:v5 gcr.io/k8s-minikube/storage-provisioner:v5

kubelet安装

下载对应版本的kubelet，然后copy到对应目录下

tar vzxf kubernetes-client-linux-amd64.tar.gz
cp kubernetes/client/bin/kubectl /usr/local/bin/

启动！Start

minikube start --driver=none

启动nginx

编写配置文件deployment.yaml

apiVersion: apps/v1
kind: Deployment
metadata:
  name: myapp
spec:
  selector:
    matchLabels:
      app: myapp
  replicas: 2 # tells deployment to run 2 pods matching the template
  template:
    metadata:
      labels:
        app: myapp
    spec:
      containers:
      - name: myapp
        image: nginx:latest
        ports:
        - containerPort: 80

然后执行如下命令

docker pull nginx
kubectl create -f deployment.yaml
kubectl expose deployment myapp --type=NodePort

kubectl get service 
NAME         TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
kubernetes   ClusterIP   10.96.0.1              443/TCP        98m
myapp        NodePort    10.108.66.77           80:30079/TCP   70m

curl http://192.168.65.179:30079