kubeadm init \ --apiserver-advertise-address=192.168.56.11 \ --image-repository registry.aliyuncs.com/google_containers \ --kubernetes-version v1.15.0 \ --service-cidr=10.1.0.0/16 \ --pod-network-cidr=10.2.0.0/16 \ --service-dns-domain=cluster.local \ --ignore-preflight-errors=Swap \ --ignore-preflight-errors=NumCPU
先看一下几个重点的参数
--apiserver-advertise-address：指定用 Master 的 IP 地址与其他节点通信。
--service-cidr：指定 Service 负载均衡 VIP 使用的 IP 地址段。
--pod-network-cidr：指定 Pod 的 IP 地址段。
--image-repository：Kubenetes 默认 Registries 地址是 k8s.gcr.io，在国内并不能访问 gcr.io，通过这个参数，将其指定为阿里云镜像地址：registry.aliyuncs.com/google_containers。
--kubernetes-version=v1.13.3：指定要安装的版本号。
--ignore-preflight-errors=：忽略运行时的错误，--ignore-preflight-errors=NumCPU 和 --ignore-preflight-errors=Swap 就是忽略 CPU 内核的数的限制和 Swap 的限制。
整个过程可能会持续 5 分钟左右，整个输出的结果如下:
[init] Using Kubernetes version: v1.15.0 [preflight] Running pre-flight checks [WARNING NumCPU]: the number of available CPUs 1 is less than the required 2 [preflight] Pulling images required for setting up a Kubernetes cluster [preflight] This might take a minute or two, depending on the speed of your internet connection [preflight] You can also perform this action in beforehand using 'kubeadm config images pull' [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Activating the kubelet service [certs] Using certificateDir folder "/etc/kubernetes/pki" [certs] Generating "etcd/ca" certificate and key [certs] Generating "etcd/server" certificate and key [certs] etcd/server serving cert is signed for DNS names [k8s-node1 localhost] and IPs [192.168.56.11 127.0.0.1 ::1] [certs] Generating "etcd/healthcheck-client" certificate and key [certs] Generating "etcd/peer" certificate and key [certs] etcd/peer serving cert is signed for DNS names [k8s-node1 localhost] and IPs [192.168.56.11 127.0.0.1 ::1] [certs] Generating "apiserver-etcd-client" certificate and key [certs] Generating "ca" certificate and key [certs] Generating "apiserver-kubelet-client" certificate and key [certs] Generating "apiserver" certificate and key [certs] apiserver serving cert is signed for DNS names [k8s-node1 kubernetes kubernetes.default kubernetes.default.svc kubernetes.default.svc.cluster.local] and IPs [10.1.0.1 192.168.56.11] [certs] Generating "front-proxy-ca" certificate and key [certs] Generating "front-proxy-client" certificate and key [certs] Generating "sa" key and public key [kubeconfig] Using kubeconfig folder "/etc/kubernetes" [kubeconfig] Writing "admin.conf" kubeconfig file [kubeconfig] Writing "kubelet.conf" kubeconfig file [kubeconfig] Writing "controller-manager.conf" kubeconfig file [kubeconfig] Writing "scheduler.conf" kubeconfig file [control-plane] Using manifest folder "/etc/kubernetes/manifests" [control-plane] Creating static Pod manifest for "kube-apiserver" [control-plane] Creating static Pod manifest for "kube-controller-manager" [control-plane] Creating static Pod manifest for "kube-scheduler" [etcd] Creating static Pod manifest for local etcd in "/etc/kubernetes/manifests" [wait-control-plane] Waiting for the kubelet to boot up the control plane as static Pods from directory "/etc/kubernetes/manifests". This can take up to 4m0s [kubelet-check] Initial timeout of 40s passed. [apiclient] All control plane components are healthy after 41.503341 seconds [upload-config] Storing the configuration used in ConfigMap "kubeadm-config" in the "kube-system" Namespace [kubelet] Creating a ConfigMap "kubelet-config-1.15" in namespace kube-system with the configuration for the kubelets in the cluster [upload-certs] Skipping phase. Please see --upload-certs [mark-control-plane] Marking the node k8s-node1 as control-plane by adding the label "node-role.kubernetes.io/master=''" [mark-control-plane] Marking the node k8s-node1 as control-plane by adding the taints [node-role.kubernetes.io/master:NoSchedule] [bootstrap-token] Using token: 5wf7mp.v61tv0s23ewbun1l [bootstrap-token] Configuring bootstrap tokens, cluster-info ConfigMap, RBAC Roles [bootstrap-token] configured RBAC rules to allow Node Bootstrap tokens to post CSRs in order for nodes to get long term certificate credentials [bootstrap-token] configured RBAC rules to allow the csrapprover controller automatically approve CSRs from a Node Bootstrap Token [bootstrap-token] configured RBAC rules to allow certificate rotation for all node client certificates in the cluster [bootstrap-token] Creating the "cluster-info" ConfigMap in the "kube-public" namespace [addons] Applied essential addon: CoreDNS [addons] Applied essential addon: kube-proxy 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 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 192.168.56.11:6443 --token 5wf7mp.v61tv0s23ewbun1l \ --discovery-token-ca-cert-hash sha256:ca524d88dbcc9a79c70c4cf21fba7252c0f12e5ab0fe9674e7f6998ab9fb5901
上面输出的最后部分提示我们连个信息： - 需要执行几个命令来在用户目录下建立配置文件 - 告诉我们其他节点加入集群的命令
准备配置文件按照上面的执行结果中的要求，执行以下命令。
mkdir -p $HOME/.kube cp -i /etc/kubernetes/admin.conf $HOME/.kube/config chown $(id -u):$(id -g) $HOME/.kube/config
在配置文件中，记录了 API Server 的访问地址，所以后面直接执行 kubectl 命令就可以正常连接到 API Server 中。
使用以下命令查看组件的状态
kubectl get cs
输出结果如下