kubectl 多环境切换

kubectl 在一个配置文件中配置多个环境信息，然后可以切换操作：

先看如下配置文件

apiVersion: v1
kind: Config
clusters:
- name: "myk8s"
  cluster:
    server: "https://rancher.shanhy.com/k8s/clusters/c-97hgz"
    certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUJpRENDQ
      VM2Z0F3SUJBZ0lCQURBS0JnZ3Foa2pPUFFRREFqQTdNUnd3R2dZRFZRUUtFeE5rZVc1aGJXbGoKY
      …………………省略…………………
      jRHMDNJV0Ixb1NTaWJDNHNwd0xXQkorQUloQU9NRngrRFJYZVlONTZpVDRSR2JzUElXMzQ2Vwo4Y
      ndDb0IvK2Zvd2JNQXRYCi0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0="
- name: "myk8s-middleware2"
  cluster:
    server: "https://192.168.1.122:6443"
    certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUN3akNDQ
      WFxZ0F3SUJBZ0lCQURBTkJna3Foa2lHOXcwQkFRc0ZBREFTTVJBd0RnWURWUVFERXdkcmRXSmwKT
      …………………省略…………………
      XFJUmRnaXBLMElmUDBoYnlFMUZlN0swMTJsaUlyYzlSWkVYYVpUUEE9Ci0tLS0tRU5EIENFUlRJR
      klDQVRFLS0tLS0K"
- name: "myk8s-server04"
  cluster:
    server: "https://192.168.1.142:6443"
    certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUN3akNDQ
      WFxZ0F3SUJBZ0lCQURBTkJna3Foa2lHOXcwQkFRc0ZBREFTTVJBd0RnWURWUVFERXdkcmRXSmwKT
      …………………省略…………………
      XFJUmRnaXBLMElmUDBoYnlFMUZlN0swMTJsaUlyYzlSWkVYYVpUUEE9Ci0tLS0tRU5EIENFUlRJR
      klDQVRFLS0tLS0K"
- name: "myk8s-middleware3"
  cluster:
    server: "https://192.168.1.129:6443"
    certificate-authority-data: "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUN3akNDQ
      WFxZ0F3SUJBZ0lCQURBTkJna3Foa2lHOXcwQkFRc0ZBREFTTVJBd0RnWURWUVFERXdkcmRXSmwKT
      …………………省略…………………
      XFJUmRnaXBLMElmUDBoYnlFMUZlN0swMTJsaUlyYzlSWkVYYVpUUEE9Ci0tLS0tRU5EIENFUlRJR
      klDQVRFLS0tLS0K"

users:
- name: "myk8s"
  user:
    token: "kubeconfig-user-rmz6q.c-97hgz:29z89ns8whhgq8zptgbtkgg8rnq86hcxnb75rm5t4ptt7l57cfvwlv"


contexts:
- name: "myk8s"
  context:
    user: "myk8s"
    cluster: "myk8s"
- name: "myk8s-middleware2"
  context:
    user: "myk8s"
    cluster: "myk8s-middleware2"
- name: "myk8s-server04"
  context:
    user: "myk8s"
    cluster: "myk8s-server04"
- name: "myk8s-middleware3"
  context:
    user: "myk8s"
    cluster: "myk8s-middleware3"

current-context: "myk8s"

在配置文件中定义了4个 context 环境，分别为 myk8s、myk8s-middleware2、myk8s-server04、myk8s-middleware3，下面为切换环境的命令示例：

[root@middleware3 .kube]# kubectl config use-context myk8s-middleware2
Switched to context "myk8s-middleware2".
[root@middleware3 .kube]# kubectl get nodes
NAME          STATUS   ROLES                      AGE    VERSION
middleware    Ready                         3h9m   v1.19.4
middleware2   Ready    controlplane,etcd,worker   547d   v1.19.4
middleware3   Ready    controlplane,etcd,worker   547d   v1.19.4
server01      Ready    worker                     547d   v1.19.4
server02      Ready    worker                     547d   v1.19.4
server03      Ready    worker                     547d   v1.19.4
server04      Ready    controlplane,etcd,worker   172d   v1.19.4
[root@middleware3 .kube]# 

（END）