使用rancher cli命令操作k8s报Unable to connect to the server: x509

rancher高可用部署，通过域名(购买的ssl证书)地址login，

执行rancher kubectl get node报错如下，请问下具体怎么解决？

[root@cdh3 bin]# rancher kubectl get node

Unable to connect to the server: x509: certificate signed by unknown authority
FATA[0000] exit status 1                                

[root@cdh3 bin]#