通过kubeconfig同时连接多个K8S集群

1. 修改两个kubeconfig.json的内容

   {
       "kind": "Config",
       "apiVersion": "v1",
       "preferences": {},
       "clusters": [ {
           "name": "externalCluster", # 修改这里-1
           "cluster": {
               "server": "https://119.xxx.xxx.xxx:5443",
               "insecure-skip-tls-verify": true
           }
       }],
       "users": [{
           "name": "user", # 修改这里-2
           "user": {
               "client-certificate-data": "LS0tLS1CRUdJTxM...",
               "client-key-data": "LS0tLS1CRUdJTiB...."
           }
       }],
       "contexts": [{
           "name": "external", # 修改这里-3
           "context": {
               "cluster": "externalCluster", # 修改这里-1
               "user": "user" # 修改这里-2
           }
       }],
       "current-context": "external" # 修改这里-3
   }
   

2. 合并kubeconfig.json

   # 备份原始 kubeconfig 文件
   cp ~/.kube/config ~/.kube/config.bak
   
   # 合并 kubeconfig1.json 和 kubeconfig2.json
   KUBECONFIG=kubeconfig1.json:kubeconfig2.json kubectl config view --flatten > ~/.kube/config
   

3. 使用方式

   # 切换集群
   kubectl config use-context Cluster-A-Context
   # 查看集群信息
   kubectl cluster-info