开始语

一位普通的程序员，慢慢在努力变强！

温馨提示：初始化k8s的前置配置，请查看以下连接！
k8s初始化前的基础配置

1.下载组件

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

# 将 SELinux 设置为 permissive 模式（相当于将其禁用）
sudo setenforce 0
sudo sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

查看安装版本：
yum list kubeadm.x86_64 --showduplicates | sort -r|grep 1.25
下载k8s：
yum -y install kubeadm-1.25.0 kubelet-1.25.0 kubectl-1.25.0
设置开机自启：
systemctl daemon-reload
systemctl enable --now kubelet
检查状态：
systemctl status kubelet  （启动异常，异常信息提示初始化 init）

如果启动异常需要进行查看日志：
journalctl -xefu kubelet 

2.检查镜像,如果下载慢，使用国产镜像

#k8s提供镜像
[root@k8s-master ~]# kubeadm config images list --kubernetes-version v1.25.0
registry.k8s.io/kube-apiserver:v1.25.0
registry.k8s.io/kube-controller-manager:v1.25.0
registry.k8s.io/kube-scheduler:v1.25.0
registry.k8s.io/kube-proxy:v1.25.0
registry.k8s.io/pause:3.8
registry.k8s.io/etcd:3.5.4-0
registry.k8s.io/coredns/coredns:v1.9.3

#查看国内镜像
[root@k8s-master ~]# kubeadm  config images list  --image-repository registry.aliyuncs.com/google_containers
registry.aliyuncs.com/google_containers/kube-apiserver:v1.25.0
registry.aliyuncs.com/google_containers/kube-controller-manager:v1.25.0
registry.aliyuncs.com/google_containers/kube-scheduler:v1.25.0
registry.aliyuncs.com/google_containers/kube-proxy:v1.25.0
registry.aliyuncs.com/google_containers/pause:3.8
registry.aliyuncs.com/google_containers/etcd:3.5.4-0
registry.aliyuncs.com/google_containers/coredns:v1.9.3

#下载下来，通过 docker tag 修改进行名称-->registry.k8s.io
例： docker tag registry.aliyuncs.com/google_containers/kube-apiserver:v1.25.0 registry.k8s.io/kube-apiserver:v1.25.0

3.初始化集群

kubeadm init \
--kubernetes-version=v1.25.0  \
--pod-network-cidr=192.168.0.0/12 \
--service-cidr=10.96.0.0/12 \
--token-ttl=0 --cri-socket unix:///run/cri-dockerd.sock \
--image-repository registry.aliyuncs.com/google_containers \
--ignore-preflight-errors=Swap

#出现下列结果说明成功！
Your Kubernetes control-plane has initialized successfully!

To start using your cluster, you need to run the following as a regular user:

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

Alternatively, if you are the root user, you can run:

  export KUBECONFIG=/etc/kubernetes/admin.conf

You should now deploy a pod network to the cluster.
Run "kubectl apply -f [podnetwork].yaml" with one of the options listed at:
  https://kubernetes.io/docs/concepts/cluster-administration/addons/

Then you can join any number of worker nodes by running the following on each as root:

kubeadm join 10.0.16.4:6443 --token imqv89.0s5moqm9w7996j52 \
        --discovery-token-ca-cert-hash sha256:2e0b6250d4fd252c209e275d81b4a20c3b5af466a3512ee134dacfb3f3b000d0 
        
#开始执行上面提示的三条命令：
mkdir -p $HOME/.kube
sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
sudo chown $(id -u):$(id -g) $HOME/.kube/config

4.开启单机污点模式，master可执行调度

提示：如果你是单机，需要开启污点

kubectl taint nodes vm-16-4-centos(节点名称) node-role.kubernetes.io/master-

5.安装网络插件flannel

wget https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml 
# 修改的地方:
net-conf.json: |                                                                                                                                                                                                                                                          
    {                                                                                                                                                                                                                                                                       
      "Network": "192.168.0.0/24",      # 修改为这个值，不然会报错 ,前两位和你的网段一致  init初始化： --pod-network-cidr=192.168.0.0/12                                                                                                                                                                                                                                
      "Backend": {                                                                                                                                                                                                                                                          
        "Type": "vxlan"                                                                                                                                                                                                                                                     
      }                                                                                                                                                                                                                                                                     
  }   

结束语

本章节完成了，各位正在努力的程序员们，如果你们觉得本文章对您有用的话，或者是你学到了一些东西，希望用您那漂亮，帅气的小手点个赞，支持一下猿仁！
由于工作等原因，更新比较慢，从今天开始，将会持续更新内容！