2021-01-25 00:02:45 +08:00
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# 管理客户端kubeconfig
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默认 k8s集群安装成功后生成客户端kubeconfig，它拥有集群管理的所有权限（不要将这个admin权限、50年期限的kubeconfig流露出去）；而我们经常需要将限定权限、限定期限的kubeconfig 分发给普通用户；利用cfssl签发自定义用户证书和k8s灵活的rbac权限绑定机制，ezctl 工具封装了这个功能。
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## 使用帮助
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```
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ezctl help kcfg-adm
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Usage: ezctl kcfg-adm <cluster> <args>
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available <args>:
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-A to add a client kubeconfig with a newly created user
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-D to delete a client kubeconfig with the existed user
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-L to list all of the users
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-e to set expiry of the user certs in hours (ex. 24h, 8h, 240h)
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-t to set a user-type (admin or view)
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-u to set a user-name prefix
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examples: ./ezctl kcfg-adm test-k8s -L
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./ezctl kcfg-adm default -A -e 240h -t admin -u jack
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./ezctl kcfg-adm default -D -u jim-202101162141
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```
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2021-09-23 21:36:34 +08:00
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- 可以设置过期时间
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- 可以设置权限：管理员权限（admin）和只读权限（view）
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2021-01-25 00:02:45 +08:00
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## 使用举例
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- 1.查看集群k8s-01当前自定义kubeconfig
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```
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ezctl kcfg-adm k8s-01 -L
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2021-01-24 16:32:43 INFO list-kcfg k8s-01
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2021-01-24 16:32:43 INFO list-kcfg in cluster:k8s-01
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USER TYPE EXPIRY(+8h if in Asia/Shanghai)
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---------------------------------------------------------------------------------
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2021-01-24 16:32:43 INFO list-kcfg k8s-01 success
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```
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初始情况下列表为空
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- 2.增加集群k8s-01一个自定义用户kubeconfig，用户名user01，期限24h，只读权限
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```
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ezctl kcfg-adm k8s-01 -A -u user01 -e 24h -t view
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2021-01-24 17:32:33 INFO add-kcfg k8s-01
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2021-01-24 17:32:33 INFO add-kcfg in cluster:k8s-01 with user:user01-202101241732
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PLAY [localhost] *****************************************************************************************************
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...（此处省略输出）
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TASK [deploy : debug] ************************************************************************************************
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ok: [localhost] => {
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"msg": "查看user01-202101241732自定义kubeconfig：/etc/kubeasz/clusters/k8s-01/ssl/users/user01-202101241732.kubeconfig"
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}
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PLAY RECAP ***********************************************************************************************************
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localhost : ok=12 changed=10 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
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2021-01-24 17:32:41 INFO add-kcfg k8s-01 success
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```
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生成的kubeconfig位于 /etc/kubeasz/clusters/k8s-01/ssl/users/user01-202101241732.kubeconfig
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- 3.再增加一个用户user02，期限240h，admin权限
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```
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ezctl kcfg-adm k8s-01 -A -u user02 -e 240h -t admin
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2021-01-24 18:38:47 INFO add-kcfg k8s-01
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2021-01-24 18:38:47 INFO add-kcfg in cluster:k8s-01 with user:user02-202101241838
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PLAY [localhost] *****************************************************************************************************
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...（此处省略输出）
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TASK [deploy : debug] ************************************************************************************************
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ok: [localhost] => {
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"msg": "查看user02-202101241838自定义kubeconfig：/etc/kubeasz/clusters/k8s-01/ssl/users/user02-202101241838.kubeconfig"
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}
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PLAY RECAP ***********************************************************************************************************
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localhost : ok=12 changed=9 unreachable=0 failed=0 skipped=0 rescued=0 ignored=0
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2021-01-24 18:38:55 INFO add-kcfg k8s-01 success
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```
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- 4.再次查看集群k8s-01当前自定义kubeconfig
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```
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ezctl kcfg-adm k8s-01 -L
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2021-01-24 18:40:30 INFO list-kcfg k8s-01
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2021-01-24 18:40:30 INFO list-kcfg in cluster:k8s-01
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USER TYPE EXPIRY(+8h if in Asia/Shanghai)
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---------------------------------------------------------------------------------
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user02-202101241838 cluster-admin 2021-02-03T10:34:00Z
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user01-202101241732 view 2021-01-25T09:28:00Z
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2021-01-24 18:40:31 INFO list-kcfg k8s-01 success
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```
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- 5.删除user01-202101241732 权限
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``` bash
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ezctl kcfg-adm k8s-01 -D -u user01-202101241732
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2021-01-24 21:41:50 INFO del-kcfg k8s-01
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2021-01-24 21:41:50 INFO del-kcfg in cluster:k8s-01 with user:user01-202101241732
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clusterrolebinding.rbac.authorization.k8s.io "crb-user01-202101241732" deleted
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2021-01-24 21:41:50 INFO del-kcfg k8s-01 success
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ezctl kcfg-adm k8s-01 -L
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2021-01-24 21:42:02 INFO list-kcfg k8s-01
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2021-01-24 21:42:02 INFO list-kcfg in cluster:k8s-01
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USER TYPE EXPIRY(+8h if in Asia/Shanghai)
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---------------------------------------------------------------------------------
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user02-202101241838 cluster-admin 2021-02-03T10:34:00Z
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2021-01-24 21:42:02 INFO list-kcfg k8s-01 success
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```
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