ubuntu kubeadm 搭建kubernetes1.15.9

准备

• update && 安装docker

  apt-get update
  apt install docker
  

• 修改daemon.json

  cat /etc/docker/daemon.json
  {
    "exec-opts":["native.cgroupdriver=systemd"],  # kubelet 的 文件驱动默认cgroupfs
    "registry-mirrors": ["http://hub-mirror.c.163.com"]
  }
  

• 启动docker

  systemctl start docker && systemctl enable docker
  

• 关闭swap

  swapoff -a
  

启动k8s

• 安装kuebadm kubectl kubelet

  apt install -y kubeadm=1.15.9-00 kubectl=1.15.9-00 kubelet=1.15.9-00
  

• k8s 准备工作

  cat /etc/systemd/system/kubelet.service.d/10-kubeadm.conf
  [Service]
  Environment="KUBELET_KUBECONFIG_ARGS=--cgroup-driver=systemd --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
  Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
  EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
  EnvironmentFile=-/etc/default/kubelet
  ExecStart=
  ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
  
  
  systemctl start kubelet && systemctl enable kubelet
  

• 初始化安装k8s

  kubeadm init --kubernetes-version 1.15.9 --pod-network-cidr 10.244.0.0/16 --apiserver-advertise-address 192.168.1.94 --image-repository registry.aliyuncs.com/google_containers
  
  # 到这步有看到kubeadm join 就算是成功了
  

• 移动kube conf 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
  

配置网络

kubectl get node
# 你会发现master节点属于not ready 状态


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

kubectl apply -f https://raw.githubusercontent.com/coreos/flannel/master/Documentation/k8s-manifests/kube-flannel-rbac.yml

# 等一会再kubectl get node 就好了

节点添加

再kubeadm init 成功后 会有
kubeadm join 命令，每个节点添加一下这个命令即可。这个命令有时效性，失效后需要重新生成hash 

其他问题

问题一（coredns）

pods coredns : network: failed to find plugin "bridge" in path

[/opt/cni/bin]]
解决：
go get github.com/containernetworking/plugins
cd $GOPATH/src/github.com/containernetworking/plugins
./build_linux.sh
rm -rf /opt/cni/bin/*
cp bin/* /opt/cni/bin  # 请在每一个节点上都要有噢(其他节点请使用scp命令) 

问题二(其他节点无法使用kubectl的原因)

其他节点使用k8s命令时：
The connection to the server localhost:8080 was refused - did you specify the right host or port?


解决：
将master节点的conf 文件传给其他节点即可

scp <master-user>@<master-ip>:/etc/kubernetes/admin.conf ~/.kube/conf

问题三（master 不能部署pod）

不允许运行在master 节点上部署

 default-scheduler  0/1 nodes are available: 1 node(s) had taints that the pod didn‘t tolerate

解决：

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

ubuntu18.04 kuebadm 安装 k8s-1.15.9