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notes-certbot.txt
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# CentOS 9 Stream, certbot 2.9.0 配置笔记，2024-05-27
#
# 版权所有：Copyright (C) 2024, Martin Young <[email protected]>
#---------------------------------------------------------------------------------------------
安装
========================
先安装EPEL 9：https://docs.fedoraproject.org/en-US/epel/
dnf install certbot
systemctl enable --now certbot-renew.timer
发行版没有man，官网可以下载手册。也可以看帮助：
certbot -h 基本帮助
certbot -h all 详细帮助
配置
========================
certbot功能是与Let's Encrypt进行交互，确认网站所有者的身份，然后申请证书。另外一个功能是自动更新
证书。这使用所谓的ACME(Automatic Certificate Management Environment)协议。
关于ACME：https://github.com/ietf-wg-acme/acme/tree/master
常用ACME challenge方式：
. http-01 certbot在网站根目录下生成/.well-known/acme-challenge/*，然后让Let's Encrypt的CA端过来取，能取到就说明网站是你的。
. dns-01 Let's Encrypt的CA端给你一个TXT记录值，让你设置域名解析记录。
http-01方式容易实现自动化。必须保证80端口网站已经正常上线。服务器可以看到的日志：
66.133.109.36 - - [25/Nov/2017:17:22:47 +0800] "GET /.well-known/acme-challenge/SE-jPsaMdD21zRpwbqdIPqKAY9gFO0Zfgg2bFgc3Q10 HTTP/1.1" 200 107
配置文件：
/etc/sysconfig/certbot 环境参数、钩子；我们通常不在这儿配置
/etc/letsencrypt/renewal/ 这下面是各证书的自动更新配置信息，是初次申请时自动生成的，通常不用修改；日志中如果出现错误则应考虑这里有问题
Let's Encrypt免费证书有效期3个月，certbot使用timer定时运行certbot-renew.service自动更新证书。
手册中建议每天执行两次。可查看：
systemctl list-timers certbot*
systemctl cat certbot-renew.timer
如果要设置自己的证书更新时间和频度，则：
systemctl edit certbot-renew.timer
例如：
[Timer]
OnCalendar=Mon-Sat *-*-* 06:00:00
RandomizedDelaySec=10minutes
certbot renew 可带参数：
--quiet
--deploy-hook </path/to/deploy-hook-script> 这是更新了证书以后自动执行的脚本
这个脚本也可以直接放在这个目录下面而不必写在命令行参数中：
/etc/letsencrypt/renewal-hooks/deploy/
通常将重启apache httpd的命令写在脚本reload_httpd.sh中，以便证书更新后自动重启。
日志在 /var/log/letsencrypt/ ，非常详细。
初次获取证书
========================
交互方式：
[root@www]# certbot certonly -d www.foo.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
How would you like to authenticate with the ACME CA?
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1: Runs an HTTP server locally which serves the necessary validation files under
the /.well-known/acme-challenge/ request path. Suitable if there is no HTTP
server already running. HTTP challenge only (wildcards not supported).
(standalone)
2: Saves the necessary validation files to a .well-known/acme-challenge/
directory within the nominated webroot path. A seperate HTTP server must be
running and serving files from the webroot path. HTTP challenge only (wildcards
not supported). (webroot)
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 2
Requesting a certificate for www.foo.com
Input the webroot for www.foo.com: (Enter 'c' to cancel): /var/www/html
Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/www.foo.com/fullchain.pem
Key is saved at: /etc/letsencrypt/live/www.foo.com/privkey.pem
This certificate expires on 2024-08-21.
These files will be updated when the certificate renews.
Certbot has set up a scheduled task to automatically renew this certificate in the background.
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If you like Certbot, please consider supporting our work by:
* Donating to ISRG / Let's Encrypt: https://letsencrypt.org/donate
* Donating to EFF: https://eff.org/donate-le
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也可以全写在命令行中：
certbot certonly --webroot -w /var/www/html -d www.foo.com --preferred-challenges http-01
使用证书
========================
参见certbot手册的Where are my certificates。
httpd<V2.4.8版本的配置如下：
SSLCertificateFile /etc/letsencrypt/live/www.foo.com/cert.pem
SSLCertificateKeyFile /etc/letsencrypt/live/www.foo.com/privkey.pem
SSLCertificateChainFile /etc/letsencrypt/live/www.foo.com/chain.pem
httpd>=V2.4.8版本的配置如下：
SSLCertificateFile /etc/letsencrypt/live/www.foo.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/www.foo.com/privkey.pem
删除/吊销证书
========================
certbot delete --cert-name www.foo.com 仅从本地删除；复制到其他地方的仍然可用
certbot revoke --cert-name www.foo.com 吊销
需经常检查日志错误信息
========================
如果直接复制老服务器上的 /etc/letsencrypt/ 目录到新服务器上，则可能出现错误信息。通过
修改 /etc/letsencrypt/renewal/ 的配置文件可以解决；或者全部吊销重新申请证书也可以。
备忘
========================
apache httpd 2.4.30版本开始有一个mod_md模块，可以使用httpd自动更新证书。
感觉不如使用certbot简单方便。