（１.）免费证书申请
//阿里云证书
https://juejin.im/post/5d00f8706fb9a07ede0b3c90
https://common-buy.aliyun.com/?spm=5176.2020520163.cas.3.4bf91BFD1BFDcm&commodityCode=cas#/buy
https://zhuanlan.zhihu.com/p/85040625
// openssl 证书生成
https://www.ruanyifeng.com/blog/2018/02/nginx-docker.html
// freessl 网站证书
https://segmentfault.com/a/1190000020787736
https://freessl.cn/
（２.）docker nginx ssl适配
https://www.jianshu.com/p/5f9bd492f186
（３.）nginx ssl证书安装
https://segmentfault.com/a/1190000022673232
（４.）k8s ingress nginx配置
// 证书
https://www.cnblogs.com/itzgr/p/11120079.html
// ingress https证书
https://www.cnblogs.com/itzgr/p/13030762.html
// k8s证书生成
https://notes.doublemine.me/2018-03-26-Kubernetes集群之路之TLS证书配置.html
// rancher ingress nginx默认证书
https://docs.rancher.cn/rke/config-options/add-ons/ingress-controllers.html#_1-调度-ingress-controllers
// Ingress nginx https配置：
https://blog.csdn.net/bbwangj/article/details/82940419?utm_medium=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.nonecase&depth_1-utm_source=distribute.pc_relevant.none-task-blog-BlogCommendFromMachineLearnPai2-2.nonecase