使用 kubeadm 安装 kubernetes(k8s)

服务器需要可以科学上网

  • 安装 kubeadm

    请优先按官方安装文档安装: https://kubernetes.io/docs/setup/independent/create-cluster-kubeadm/

    • 使用阿里的YUM源

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      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

    • 关闭 selinux

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      # Set SELinux in permissive mode (effectively disabling it)
      setenforce 0
      sed -i 's/^SELINUX=enforcing$/SELINUX=permissive/' /etc/selinux/config

      yum install -y kubelet kubeadm kubectl --disableexcludes=kubernetes

      systemctl enable --now kubelet

      • 加载模块 br_netfilter

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        lsmod | grep br_netfilter # centos 7 查询不到结果，看别人文档说已经编译进了某个地方，所以这一步可跳过

  • 安装 k8s

    • 提前加载镜像

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      kubeadm config images pull --image-repository=registry.aliyuncs.com/google_containers

    • 安装 k8s

      –pod-network-cidr=10.244.0.0/16 是因为后面要使用 Flannel 网络

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      kubeadm init --image-repository=registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16

      init 如果顺利完成，会提示执行几行命令

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

    • 安装Flannel网络

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      kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/a70459be0084506e4ec919aa1c114638878db11b/Documentation/kube-flannel.yml

      通过 kubectl get pods --all-namespaces 检查是否已经全部为 Running 状态

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      [root@localhost k8s]# kubectl get pods --all-namespaces
      NAMESPACE     NAME                                         READY   STATUS    RESTARTS   AGE
      kube-system   coredns-78d4cf999f-677l2                     1/1     Running   0          5m7s
      kube-system   coredns-78d4cf999f-c6wng                     1/1     Running   0          5m7s
      kube-system   etcd-localhost                               1/1     Running   0          4m40s
      kube-system   kube-apiserver-localhost                     1/1     Running   0          4m26s
      kube-system   kube-controller-manager-localhost            1/1     Running   0          4m40s
      kube-system   kube-flannel-ds-amd64-rl8mq                  1/1     Running   0          26s
      kube-system   kube-proxy-lzb5p                             1/1     Running   0          5m7s
      kube-system   kube-scheduler-localhost                     1/1     Running   0          4m39s

    • 配置master结点也可以分配 pods

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      kubectl taint nodes --all node-role.kubernetes.io/master-

  • 添加 node 节点
    请参考官网

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