【EC2】Amazon Linux2にLet’s Encrypt+certbotでSSL証明書を取得する

AWS
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はじめに

この記事ではEC2のAmazon Linux2にcertbotを使ってLet’s EncryptのSSL証明書を取得する方法を紹介します。

certbotのインストール

最初はGitHubからcertbotをcloneしてcertbotを実行できるようにしようと思っていたのですが、2019年5月現在、GitHubからcloneしてcertbot-autoを実行すると、次のエラーが発生します。

Requesting to rerun ./certbot-auto with root privileges...
Sorry, I don't know how to bootstrap Certbot on your operating system!

certbotを書き換えて対応する方法もあるようなのですが、今回はyumでcertbotをインストールすることにします。

$ sudo yum -y install epel-release-latest-7.noarch.rpm
$ sudo yum -y install certbot

Nginx対応プラグインのインストール

Nginxを使用している場合は「certbot-nginx」をインストールします。

certbot実行時にnginxを指定することで、nginxの設定ファイルに証明書の設定を自動で追加してくれます。

$ sudo yum -y install certbot-nginx

certbotを使ってSSL証明書を取得

Nginxを使用している場合は、オプションで「–nginx」を指定します。

「-d」オプションに続いてドメイン名を入力します。

certbot実行時に権限でエラーになる場合は、root権限で実行します。

$ certbot --nginx -d xxxxxxxxxxx.com -d www.xxxxxxxxxxx.com

Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): xxxxxxxxxx@example.com

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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
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for xxxxxxxxxxx.com
http-01 challenge for www.xxxxxxxxxxx.com
Waiting for verification...
Cleaning up challenges
Deploying Certificate to VirtualHost /etc/nginx/nginx.conf
Deploying Certificate to VirtualHost /etc/nginx/nginx.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): 2
Redirecting all traffic on port 80 to ssl in /etc/nginx/nginx.conf
Redirecting all traffic on port 80 to ssl in /etc/nginx/nginx.conf

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Congratulations! You have successfully enabled "https://xxxxxxxxxxx.com" and
"https://www.xxxxxxxxxxx.com"

You should test your configuration at:
"https://www.ssllabs.com/ssltest/analyze.html?d=xxxxxxxxxxx.com"
"https://www.ssllabs.com/ssltest/analyze.html?d=www.xxxxxxxxxxx.com"
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IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/xxxxxxxxxxx.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/xxxxxxxxxxx.com/privkey.pem
   Your cert will expire on 2019-08-19. 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

Nginxの再起動

Nginxのコンフィグをテストし、問題なければNginxを再起動します。


$ nginx -t
$ sudo systemctl restart nginx
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