hello-k8s

k8s demo

开发环境搭建

multipass

• 安装（略）

  • "C:\Windows\System32\config\systemprofile\AppData\Roaming\multipassd\vault\instances"
  • hyper-v之前安装过的无用虚拟机删除

• 创建multipass虚拟机

    multipass launch --name k8s-master --disk 40G --mem 8G --cpus 4 --cloud-init cloud-config.yml docker
    multipass launch --name k8s-node-1 --disk 40G --mem 4G --cpus 2 --cloud-init cloud-config.yml docker
    multipass launch --name k8s-node-2 --disk 40G --mem 4G --cpus 2 --cloud-init cloud-config.yml docker
    multipass launch --name k8s-node-3 --disk 40G --mem 4G --cpus 2 --cloud-init cloud-config.yml docker
    multipass launch --name k8s-node-0 --disk 40G --mem 4G --cpus 2 --cloud-init cloud-config.yml docker

docker

• 设置mirror

    sudo mkdir -p /etc/docker
    sudo tee /etc/docker/daemon.json <<-'EOF'
    {
      "exec-opts": ["native.cgroupdriver=systemd"],
      "registry-mirrors": ["https://g710x36t.mirror.aliyuncs.com"]
    }
    EOF
    sudo systemctl daemon-reload
    sudo systemctl restart docker
    sudo docker login --username=beecluster registry.cn-hangzhou.aliyuncs.com

k8s集群初始化

• 安装kubeadm kubelet kubectl

  sudo apt-get update
  sudo apt-get install -y apt-transport-https ca-certificates curl
  sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://mirrors.aliyun.com/kubernetes/apt/doc/apt-key.gpg
  echo "deb [signed-by=/usr/share/keyrings/kubernetes-archive-keyring.gpg] https://mirrors.aliyun.com/kubernetes/apt/ kubernetes-xenial main" | sudo tee /etc/apt/sources.list.d/kubernetes.list
  sudo apt update
  sudo apt install -y kubelet kubeadm kubectl

• 关闭虚拟内存

  # 永久关闭虚拟内存：注释掉swap或者sw相关行
  sudo vim /etc/fstab 
  # 临时关闭虚拟内存
  sudo swapoff -a 

• 初始化k8s集群

  因为k8s.gcr.io被强，所以下载阿里云镜像然后重新tag。

  # 生成配置文件
  kubeadm config print init-defaults >kubeadm.cfg
  
  # 拉取镜像
  kubeadm config images pull --config kubeadm.cfg
  
  # 修改配置文件
  sed -i "s/imageRepository: .*/imageRepository: registry.cn-hangzhou.aliyuncs.com\/google_containers/g" kubeadm.cfg
  /**
    apiVersion: kubeadm.k8s.io/v1beta3
    bootstrapTokens:
    - groups:
      - system:bootstrappers:kubeadm:default-node-token
      token: abcdef.0123456789abcdef
      ttl: 24h0m0s
      usages:
      - signing
      - authentication
    kind: InitConfiguration
    localAPIEndpoint:
      advertiseAddress: 172.22.26.62  # 改为本机局域网ip
      bindPort: 6443
    nodeRegistration:
      criSocket: /var/run/dockershim.sock
      imagePullPolicy: IfNotPresent
      name: node
      taints: null
    ---
    apiServer:
      timeoutForControlPlane: 4m0s
    apiVersion: kubeadm.k8s.io/v1beta3
    certificatesDir: /etc/kubernetes/pki
    clusterName: kubernetes # 可改成你喜欢的名字
    controllerManager: {}
    dns: {}
    etcd:
      local:
        dataDir: /var/lib/etcd
    imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers  # 设置为为阿里云镜像
    kind: ClusterConfiguration
    kubernetesVersion: 1.23.0
    networking:
      podSubnet: 10.244.0.0/16 # --pod-network-cidr 稍后要设置flanel插件和这个一致
       # podSubnet: "172.22.31.39/20" # multipass 一定要和k8s-master的eth0地址吻合！
      dnsDomain: cluster.local
      serviceSubnet: 10.96.0.0/12
    scheduler: {}
  * /
  
  # initializes cluster master node
  sudo kubeadm init --config kubeadm.cfg
  
  # 按照提示复制集群配置文件
  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
  
  # 查看状态
  # 注意这里一定不能用sudo 否则会提示The connection to the server localhost:8080 was refused - did you specify the right host or port?
  # 如果出现权限问题，则把权限问题解决，用普通用户执行(fuck this shit)。
  kubectl get nodes  # status: NotReady
  kubectl get pods --all-namespaces  # status:pending
  
  # 初始化集群网络
  wget https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
  /**
    net-conf.json: |
      {
        "Network": "10.244.0.0/16",  # 改为和--pod-network-cidr一致
        "Backend": {
          "Type": "vxlan"
        }
      }
  */
  kubectl apply -f kube-flannel.yml
  
  # join
  sudo kubeadm join 172.22.16.82:6443 --token abcdef.0123456789abcdef  --discovery-token-ca-cert-hash sha256:d481878e274ccb45ff506db551f3388c9cb44da3a414d631e591742fdc7d703d
  
  # create an nginx deployment
  kubectl apply -f https://raw.githubusercontent.com/kubernetes/website/master/content/en/examples/application/nginx-app.yaml

• 删除cluster

  sudo kubeadm reset  

  build

  • docker build -t hello-k8s .

k8s部署

# 虚拟机挂在共享盘
multipass set local.privileged-mounts=true
multipass mount D:/share/ k8s-master:/home/ubuntu/share

• minikube
• kubectl apply -f mongo-config.yaml
• kubectl apply -f mongo-secret.yaml
• kubectl get all
• kubectl get pod
• kubectl get svc
• kubectl get configmap
• kubectl get secret
• kubectl get node -o wide
• kubectl describe service xxx
• kubectl describe pod xxx
• kubectl minikube ip
• kubectl logs webapp-deployment-56dbf5d695-7lzml
• kubectl logs webapp-deployment-56dbf5d695-7lzml -f

multipass 使用方式

multipass launch docker --name foo

multipass networks
multipass launch -n foo --network WSL
multipass list
multipass stop foo bar
multipass start foo
multipass delete bar
multipass purge
multipass find
multipass shell foo
multipass exec foo sudo apt update
multipass exec primary lsb_release -- -a
multipass transfer xxx.txt foo:/home/ubuntu/xxx.txt
multipass set local.privileged-mounts=on
multipass mount D:\github\hello-k8s master:/home/ubuntu/hello-k8s/
multipass launch minikube -n master -d 10G -m 8G -c 4 --cloud-init cloud-config.yaml
sudo hostnamectl set-hostname master-node

multipass mount D:\share k8s-master:/home/ubuntu/share/