# Kubernetes Multi-Cluster

## Remote Cluster

### Edit kube-config setting

:::warning
這個做法比較 Hardcore，直接在 k8s 的管理主機上調整 kubectl 使用的 kube.config 內容
由於直接複製外部叢集的 admin.config，基於安全性問題，不建議用於正式環境上
:::

* 編輯 kube-config

用 vim 開啟 kubernetes 用的設定檔

vim /etc/kubernetes/admin.conf

調整內容 (加入外部 k8s 叢集的相關資料)

apiVersion: v1
clusters:
- cluster:
    certificate-authority-data: <first-cluster-cert-data>
    server: https://<first-cluster domain>:<first-cluster port>
  name: first-cluster
- cluster:
    certificate-authority-data: <second-cluster-cert-data>
    server: https://<second-cluster domain>:<second-cluster port>
  name: second-cluster
contexts:
- context:
    cluster: first-cluster
    user: first-cluster-admin
  name: first-cluster-admin@first-cluster
- context:
    cluster: second-cluster
    user: second-cluster-admin
  name: second-cluster-admin@second-cluster
current-context: first-cluster-admin@first-cluster
kind: Config
preferences: {}
users:
- name: first-cluster-admin
  user:
    client-certificate-data: <first-cluster-admin-cert-data>
    client-key-data: <first-cluster-admin-cert-key>
- name: second-cluster-admin
  user:
    client-certificate-data: <second-cluster-admin-cert-data>
    client-key-data: <second-cluster-admin-cert-key>