k8s-新增master节点

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摘要

第二步:这样,我们在任何一个master节点上使用命令  

在当前唯一的master节点上运行如下命令
第一步:
kubeadm init phase upload-certs --upload-certs

执行结果如下:
1 # kubeadm init phase upload-certs --upload-certs 2 I1109 14:34:00.836965    5988 version.go:255] remote version is much newer: v1.25.3; falling back to: stable-1.22 3 [upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace 4 [upload-certs] Using certificate key: 5 ecf2abbfdf3a7bc45ddb2de75152ec12889971098d69939b98e4451b53aa3033

第二步:

kubeadm token create --print-join-command

执行结果如下
[root@k8s-master ~]# kubeadm token create --print-join-command kubeadm join 172.16.0.1:6443 --token xxxxxx --discovery-token-ca-cert-hash sha256:xxxxxxx

第三步:
将得到的token和key进行拼接,得到如下命令:
kubeadm join 172.16.0.1:6443 --token q466v0.hbk3qjreznjsf8ew --discovery-token-ca-cert-hash xxxxxxx --control-plane --certificate-key xxxxxxx

注意事项:

  1. 不要使用 --experimental-control-plane,会报错
  2. 要加上--control-plane --certificate-key ,不然就会添加为node节点而不是master
  3. join的时候节点上不要部署,如果部署了kubeadm reset后再join
 
第四步:
join之后在原先唯一的master节点上成功后,显示如下消息:
This node has joined the cluster and a new control plane instance was created:  * Certificate signing request was sent to apiserver and approval was received. * The Kubelet was informed of the new secure connection details. * Control plane (master) label and taint were applied to the new node. * The Kubernetes control plane instances scaled up. * A new etcd member was added to the local/stacked etcd cluster.  To start administering your cluster from this node, 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  Run 'kubectl get nodes' to see this node join the cluster. 

这样,我们在任何一个master节点上使用命令

kubectl get nodes

都能看到现在是全部的节点:
# kubectl get nodes NAME          STATUS   ROLES    AGE   VERSION k8s-master    Ready    master   57m   v1.18.0 k8s-master1   Ready    master   21m   v1.18.0 k8s-master2   Ready    master   21m   v1.18.0 k8s-node1     Ready    <none>   56m   v1.18.0 k8s-node2     Ready    <none>   56m   v1.18.0 k8s-node3     Ready    <none>   56m   v1.18.0 k8s-node4     Ready    <none>   56m   v1.18.0 k8s-node5     Ready    <none>   56m   v1.18.0

报错:
1. 第一次加入集群的时候会有以下报错:
 1 [preflight] Running pre-flight checks  2 [preflight] Reading configuration from the cluster...  3 [preflight] FYI: You can look at this config file with 'kubectl -n kube-system get cm kubeadm-config -oyaml'  4 error execution phase preflight:  5 One or more conditions for hosting a new control plane instance is not satisfied.  6   7 unable to add a new control plane instance a cluster that doesn't have a stable controlPlaneEndpoint address  8   9 Please ensure that: 10 * The cluster has a stable controlPlaneEndpoint address. 11 * The certificates that must be shared among control plane instances are provided. 12  13  14 To see the stack trace of this error execute with --v=5 or higher

解决办法如下:
查看kubeadm-config.yaml kubectl -n kube-system get cm kubeadm-config -oyaml 发现没有controlPlaneEndpoint 添加controlPlaneEndpoint kubectl -n kube-system edit cm kubeadm-config 大概在这么个位置: kind: ClusterConfiguration kubernetesVersion: v1.18.0 controlPlaneEndpoint: 172.16.0.56:6443 然后再在准备添加为master的节点上执行kubeadm join的命令