> For the complete documentation index, see [llms.txt](https://note.lonelylty.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://note.lonelylty.com/coding/free_https.md).

# 2018/12/04\_free https

Let’s Encrypt free Certificate

```
wget https://dl.eff.org/certbot-auto

chmod a+x certbot-auto # executable authority

./certbot-auto certonly  -d "*.xxx.com" -d "xxx.com" --manual --preferred-challenges dns-01  --server https://acme-v02.api.letsencrypt.org/directory

dig  -t txt _acme-challenge.xxx.com @8.8.8.8

openssl x509 -in  /etc/letsencrypt/live/xxx.com/cert.pem -noout -text

certbot-auto renew #Valid for 90 days
```

—— [origin](https://www.hi-linux.com/posts/6968.html)


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://note.lonelylty.com/coding/free_https.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.