(資料圖片僅供參考)

當我們在master節(jié)點、安裝部署完docker與Kubernetes / k8s 相關的軟件后，并啟動（docker，kubelet）后，接下來就是需要對master節(jié)點進行初始化操作了

如下，這里筆者使用的版本的為 Kubernetes-v1.23.6，初始化是使用kubeadm init命令，詳細的參數(shù)如下所示：

注意點：執(zhí)行前需要先將docker的Cgroup Driver由默認的cgroupfs修改成systemd，并重啟docker讓配置生效

[root@k8s-master qq-5201351]# kubeadm init \> --apiserver-advertise-address 192.18.106.87 \> --image-repository registry.aliyuncs.com/google_containers \> --kubernetes-version v1.23.6 \> --service-cidr=10.96.0.0/12 \> --pod-network-cidr=10.224.0.0/16

如果沒有相關的報錯，就算是正常了，命令執(zhí)行完成后，可以看到一段提示

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/configAlternatively, if you are the root user, you can run:  export KUBECONFIG=/etc/kubernetes/admin.confYou 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 192.18.106.87:6443 --token 8iz44r.cxj5duahe37wsdgq \        --discovery-token-ca-cert-hash sha256:08752ac13ae6f821c44abdf6eb1fa2481777b82d20335e4467829ac20b503e55

根據(jù)提示，如果要開始使用k8s cluster，還需要在master節(jié)點上執(zhí)行如下幾條命令，這里筆者是使用root用戶，所以去掉了sudo，最終命令如下：

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

這樣，master節(jié)點的初始化，就算是完成了，上面的都執(zhí)行了，也才可以通過kubectl get nodes命令看到k8s集群中的master節(jié)點

其他說明：初始化后，我們可以也可以通過docker命令看出來，拉取了如下7個鏡像：

[root@k8s-master ~]# docker imagesREPOSITORY                                                        TAG       IMAGE ID       CREATED         SIZEregistry.aliyuncs.com/google_containers/kube-apiserver            v1.23.6   8fa62c12256d   12 months ago   135MBregistry.aliyuncs.com/google_containers/kube-scheduler            v1.23.6   595f327f224a   12 months ago   53.5MBregistry.aliyuncs.com/google_containers/kube-proxy                v1.23.6   4c0375452406   12 months ago   112MBregistry.aliyuncs.com/google_containers/kube-controller-manager   v1.23.6   df7b72818ad2   12 months ago   125MBregistry.aliyuncs.com/google_containers/etcd                      3.5.1-0   25f8c7f3da61   18 months ago   293MBregistry.aliyuncs.com/google_containers/coredns                   v1.8.6    a4ca41631cc7   19 months ago   46.8MBregistry.aliyuncs.com/google_containers/pause                     3.6       6270bb605e12   20 months ago   683kB[root@k8s-master ~]#

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