Available Commands: alpha Kubeadm experimental sub-commands completion Output shell completion code for the specified shell (bash or zsh) config Manage configuration for a kubeadm cluster persisted in a ConfigMap in the cluster help Help about any command init Run this command in order to set up the Kubernetes control plane join Run this on any machine you wish to join an existing cluster reset Run this to revert any changes made to this host by 'kubeadm init' or 'kubeadm join' token Manage bootstrap tokens upgrade Upgrade your cluster smoothly to a newer version with this command version Print the version of kubeadm
Flags: -h, --help help for kubeadm --log-file string If non-empty, use this log file --log-file-max-size uint Defines the maximum size a log file can grow to. Unit is megabytes. If the value is 0, the maximum file size is unlimited. (default 1800) --rootfs string [EXPERIMENTAL] The path to the 'real' host root filesystem. --skip-headers If true, avoid header prefixes in the log messages --skip-log-headers If true, avoid headers when opening log files -v, --v Level number for the log level verbosity
Use "kubeadm [command] --help" for more information about a command.
1）配置忽略swap报错
1 2
[root@k8s-master ~]# vim /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--fail-swap-on=false"
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:
[root@k8s-node1 ~]# vim /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--fail-swap-on=false"
[root@k8s-node2 ~]# vim /etc/sysconfig/kubelet KUBELET_EXTRA_ARGS="--fail-swap-on=false"
2）加入node1节点
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
[root@k8s-node1 ~]# kubeadm join 192.168.1.31:6443 --token a4pjca.ubxvfcsry1je626j --discovery-token-ca-cert-hash sha256:784922b9100d1ecbba01800e7493f4cba7ae5c414df68234c5da7bca4ef0c581 --ignore-preflight-errors=Swap [preflight] Running pre-flight checks [WARNING Swap]: running with swap on is not supported. Please disable swap [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Activating the kubelet service [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
3）加入node2节点
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
[root@k8s-node2 ~]# kubeadm join 192.168.1.31:6443 --token a4pjca.ubxvfcsry1je626j --discovery-token-ca-cert-hash sha256:784922b9100d1ecbba01800e7493f4cba7ae5c414df68234c5da7bca4ef0c581 --ignore-preflight-errors=Swap [preflight] Running pre-flight checks [WARNING Swap]: running with swap on is not supported. Please disable swap [preflight] Reading configuration from the cluster... [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml' [kubelet-start] Downloading configuration for the kubelet from the "kubelet-config-1.15" ConfigMap in the kube-system namespace [kubelet-start] Writing kubelet configuration to file "/var/lib/kubelet/config.yaml" [kubelet-start] Writing kubelet environment file with flags to file "/var/lib/kubelet/kubeadm-flags.env" [kubelet-start] Activating the kubelet service [kubelet-start] Waiting for the kubelet to perform the TLS Bootstrap...
This node has joined the cluster: * Certificate signing request was sent to apiserver and a response was received. * The Kubelet was informed of the new secure connection details.
Run 'kubectl get nodes' on the control-plane to see this node join the cluster.
2.7 检查集群状态
1）在master节点输入命令检查集群状态，返回如下结果则集群状态正常
1 2 3 4 5
[root@k8s-master ~]# kubectl get nodes NAME STATUS ROLES AGE VERSION k8s-master Ready master 9m40s v1.15.2 k8s-node1 NotReady <none> 28s v1.15.2 k8s-node2 NotReady <none> 13s v1.15.2
重点查看STATUS内容为Ready时，则说明集群状态正常。
2）查看集群客户端和服务端程序版本信息
1 2 3
[root@k8s-master ~]# kubectl version --short=true Client Version: v1.15.2 Server Version: v1.15.2
3）查看集群信息
1 2 3 4 5 6 7 8
[root@k8s-master ~]# kubectl cluster-info
Kubernetes master is running at https://192.168.1.31:6443
KubeDNS is running at https://192.168.1.31:6443/api/v1/namespaces/kube-system/services/kube-dns:dns/proxy
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
