kubernetes集群名称

Question

kubernetes集群名称怎么看？或者怎么设置kubernetes集群名称？是一开始设置hosts里面master的名称吗？

Answer 1

嗯，可以通过 下面的命令来查看集群相关的信息

┌──[[e-mail]]-[~]
└─$kubectl config view
apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: DATA+OMITTED
    server: https://192.168.26.81:6443
  name: kubernetes
contexts:
- context:
    cluster: kubernetes
    namespace: liruilong-deploy-create
    user: kubernetes-admin
  name: kubernetes-admin@kubernetes
current-context: kubernetes-admin@kubernetes
kind: Config
preferences: {}
users:
- name: kubernetes-admin
  user:
    client-certificate-data: REDACTED
    client-key-data: REDACTED

clusters 为相关集群信息，他是一个数组，如果多集群的话，会一次展示，比如下面，只有一个集群，名字是 kubernetes , 这是 使用 kubeadm 安装 默认的集群名字

┌──[[e-mail]]-[~]
└─$kubectl config view -o json | jq .clusters
[
  {
    "name": "kubernetes",
    "cluster": {
      "server": "https://192.168.26.81:6443",
      "certificate-authority-data": "DATA+OMITTED"
    }
  }
]

如果你想改变集群的名字，可以直接修改 kubeconfig 文件中的 name 字段,如果希望多集群切换，就需要合并 kubeconfig 文件，需要修改集群的名字 ，类似下面这样

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: LS0.........0tCg==
    server: https://192.168.26.81:6443
  name: cluster1
- cluster:
    certificate-authority-data: LS0.........0tCg==
    server: https://192.168.26.91:6443
  name: cluster2
contexts:
- context:
    cluster: cluster1
    namespace: kube-public
    user: kubernetes-admin1
  name: context1
- context:
    cluster: cluster2
    namespace: kube-system
    user: kubernetes-admin2
  name: context2
current-context: context2
kind: Config
preferences: {}
users:
- name: kubernetes-admin1
  user:
    client-certificate-data: LS0.......0tCg==
    client-key-data: LS0......LQo=
- name: kubernetes-admin2
  user:
    client-certificate-data: LS0.......0tCg==
    client-key-data: LS0......0tCg==

修改完看到的信息会是这样

┌──[[e-mail]]-[~/.kube]
└─$kubectl config get-contexts
CURRENT   NAME       CLUSTER    AUTHINFO            NAMESPACE
*                    context1   cluster1   kubernetes-admin1   kube-public
                     context2   cluster2   kubernetes-admin2   kube-system