サーバ証明書はもはや必須。とは言え、ユーザテスト用サーバーにお金はかけたくない。そんなとき、Let’s Encryptは強い味方です。セットアップから自動更新設定までのメモです。
まずは、certbotのインストールから。
# yum -y install epel-release
# yum -y install certbot python-certbot-apache
certbotをインストールしたら、実行して証明書の発行。ウィザードを進めていくと発行できます。
# certbot
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator apache, Installer apache
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): myself@example.com
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
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Please read the Terms of Service at
https://letsencrypt.org/documents/LE-SA-v1.2-November-15-2017.pdf. You must
agree in order to register with the ACME server at
https://acme-v02.api.letsencrypt.org/directory
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(A)gree/(C)ancel: A
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Would you be willing to share your email address with the Electronic Frontier
Foundation, a founding partner of the Let's Encrypt project and the non-profit
organization that develops Certbot? We'd like to send you email about our work
encrypting the web, EFF news, campaigns, and ways to support digital freedom.
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(Y)es/(N)o: N
Which names would you like to activate HTTPS for?
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1: aaa.example.com
2: bbb.example.com
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Select the appropriate numbers separated by commas and/or spaces, or leave input
blank to select all options shown (Enter 'c' to cancel): 1
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for aaa.example.com
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/httpd/conf.d/ssl.conf
Please choose whether or not to redirect HTTP traffic to HTTPS, removing HTTP access.
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1: No redirect - Make no further changes to the webserver configuration.
2: Redirect - Make all requests redirect to secure HTTPS access. Choose this for
new sites, or if you're confident your site works on HTTPS. You can undo this
change by editing your web server's configuration.
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Select the appropriate number [1-2] then [enter] (press 'c' to cancel): 1
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Congratulations! You have successfully enabled https://aaa.example.com
You should test your configuration at:
https://www.ssllabs.com/ssltest/analyze.html?d=aaa.example.com
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IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/aaa.example.com/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/aaa.example.com/privkey.pem
Your cert will expire on 2019-03-04. To obtain a new or tweaked
version of this certificate in the future, simply run certbot again
with the "certonly" option. To non-interactively renew *all* of
your certificates, run "certbot renew"
- Your account credentials have been saved in your Certbot
configuration directory at /etc/letsencrypt. You should make a
secure backup of this folder now. This configuration directory will
also contain certificates and private keys obtained by Certbot so
making regular backups of this folder is ideal.
- 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
# cd /etc/letsencrypt/live/aaa.example.com/
# ls
README cert.pem chain.pem fullchain.pem privkey.pem
証明書を自動更新するように設定します。
# vi /etc/cron.monthly/certbot
以下を追加します。
#!/bin/sh
certbot renew --post-hook "systemctl restart httpd"
monthlyなcronに実行権限を付与します。
# chmod +x /etc/cron.monthly/certbot