NextCloud部署SSL泛域名证书

本文旨在总结内网穿透服务中，针对局域网暴露在外网中的域名(泛域名)做SSL证书部署，以便加强网络的安全访问。以内网中部署的NextCloud业务为例讲解了SSL证书部署的过程，同时也适合内网站点、PVE、Esxi、群晖NAS等业务的部署，读者可以举一反三进行操作。

局域网外网访问实现方式:

OpenWrt frp内网穿透 + 内网分布服务

全文目录

一、SSL证书申请

二、SSL证书部署

三、SSL证书续签

一、SSL证书申请

1> 访问www.sslforfree.com, 可以用游客模式申请证书。如果域名较多，建议注册一个账户对所有域名证书进行统一管控

另外还有一个在线申请SSL证书的网站推荐:https://freessl.org/

2> 填写泛域名和一级域名, 泛域名和主域名使用空格隔开。点击”Create Free SSL Certificate”

按照提示添加两条TXT解析记录
x3_xxxxxxxxxxxxx_xxxxxxxxxxxxvIjE2R3WSdok
p_xxxxxxxxxxxxx_xxxxxxxxxxxxS0muQC7zIzuDoo

Go into the DNS management page that your domains use (This link may help with setting up your TXT records [ignoring Google specific parts]).
Add the following TXT records below to the DNS server for each domain (Please note your DNS software may auto-add the domain in the name field, contact DNS provider if unsure or if you get NXDOMAIN errors):
Add TXT record with the name/host_acme-challenge.yourdomain.com  with the value xxxx and a TTL (Time to Live) (in seconds) of1
Add TXT record with the name/host_acme-challenge.yourdomain.com  with the xxxx and a TTL (Time to Live) (in seconds) of1
Verify TXT records have been propagated by going to the following links. The corresponding values above should show up within the record:
Verify _acme-challenge.xxx.com (2 TXT Records should show up. Multiple TXT records with the same hostname are allowed by spec. Contact your DNS provider if you need help setting up multiple TXT records.)