k8s-新增master节点

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在当前唯一的master节点上运行如下命令第一步：

1. kubeadm init phase upload-certs --upload-certs

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执行结果如下：

1. 1 # kubeadm init phase upload-certs --upload-certs
2. 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. 3 [upload-certs] Storing the certificates in Secret "kubeadm-certs" in the "kube-system" Namespace
4. 4 [upload-certs] Using certificate key:
5. 5 ecf2abbfdf3a7bc45ddb2de75152ec12889971098d69939b98e4451b53aa3033

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第二步：

1. kubeadm token create --print-join-command

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执行结果如下

1. [root@k8s-master ~]# kubeadm token create --print-join-command
2. kubeadm join 172.16.0.1:6443 --token xxxxxx --discovery-token-ca-cert-hash sha256:xxxxxxx

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第三步：将得到的token和key进行拼接，得到如下命令：

1. kubeadm join 172.16.0.1:6443 --token q466v0.hbk3qjreznjsf8ew --discovery-token-ca-cert-hash xxxxxxx --control-plane --certificate-key xxxxxxx

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注意事项：

• 不要使用 --experimental-control-plane，会报错
  
• 要加上--control-plane --certificate-key ，不然就会添加为node节点而不是master
  
• 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：

1. This node has joined the cluster and a new control plane instance was created:
3. * Certificate signing request was sent to apiserver and approval was received.
4. * The Kubelet was informed of the new secure connection details.
5. * Control plane (master) label and taint were applied to the new node.
6. * The Kubernetes control plane instances scaled up.
7. * A new etcd member was added to the local/stacked etcd cluster.
9. To start administering your cluster from this node, you need to run the following as a regular user:
11.     mkdir -p $HOME/.kube
12.     sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
13.     sudo chown $(id -u):$(id -g) $HOME/.kube/config
15. Run 'kubectl get nodes' to see this node join the cluster.

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这样，我们在任何一个master节点上使用命令

1. kubectl get nodes

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都能看到现在是全部的节点：

1. # kubectl get nodes
2. NAME          STATUS   ROLES    AGE   VERSION
3. k8s-master    Ready    master   57m   v1.18.0
4. k8s-master1   Ready    master   21m   v1.18.0
5. k8s-master2   Ready    master   21m   v1.18.0
6. k8s-node1     Ready    <none>   56m   v1.18.0
7. k8s-node2     Ready    <none>   56m   v1.18.0
8. k8s-node3     Ready    <none>   56m   v1.18.0
9. k8s-node4     Ready    <none>   56m   v1.18.0
10. k8s-node5     Ready    <none>   56m   v1.18.0

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报错：1. 第一次加入集群的时候会有以下报错：

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

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解决办法如下：

1. 查看kubeadm-config.yaml
2. kubectl -n kube-system get cm kubeadm-config -oyaml
3. 发现没有controlPlaneEndpoint
4. 添加controlPlaneEndpoint
5. kubectl -n kube-system edit cm kubeadm-config
6. 大概在这么个位置：
7. kind: ClusterConfiguration
8. kubernetesVersion: v1.18.0
9. controlPlaneEndpoint: 172.16.0.56:6443
10. 然后再在准备添加为master的节点上执行kubeadm join的命令

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来源:https://www.cnblogs.com/qianyuliang/p/17044626.html
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