1. GithubよりLet's EncryptリポジトリをCloneする
# git clone https://github.com/letsencrypt/letsencrypt.git
2. 以下のコマンドを実行する
# cd letsencrypt
# ./letsencrypt-auto certonly --manual -d *.<ドメイン名> --preferred-challenges dns
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<ドメイン名>は、*以下のドメインを入力する。
3. 画面の指示に従い、操作を行う
メールアドレスの登録
メールアドレスを入力して、[Enter]を押下します。
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator manual, Installer None
Enter email address (used for urgent renewal and security notices) (Enter 'c' to
cancel): <メールアドレス>
規約、メールアドレスの収集、IPアドレスの収集に関する同意
a を入力し、[Enter]を押下して進めます。
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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
規約、メールアドレスの収集、IPアドレスの収集に関する同意
全てy を入力し、[Enter]を押下して進めます。
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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: y
Obtaining a new certificate
Performing the following challenges:
dns-01 challenge for <ドメイン名>
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NOTE: The IP of this machine will be publicly logged as having requested this
certificate. If you're running certbot in manual mode on a machine that is not
your server, please ensure you're okay with that.
Are you OK with your IP being logged?
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(Y)es/(N)o: y
4. DNS TXTレコードの登録
以下のようなメッセージが表示され、DNS TXTレコードのエントリとして指定された値の入力（登録）を求められますので、DNSサーバに対して登録を行います。
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Please deploy a DNS TXT record under the name
_acme-challenge.<ドメイン名> with the following value:
<TXTレコードへ入力する値>
Before continuing, verify the record is deployed.
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DNSサーバへの登録後、しばらく（5分程度）時間をおいてから[Enter]を押下します。
5. 登録完了
次のようなメッセージが表示され、サーバ証明書が発行されます。
Waiting for verification...
Cleaning up challenges
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/<ドメイン名>/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/<ドメイン名>/privkey.pem
Your cert will expire on <有効期限>. To obtain a new or tweaked
version of this certificate in the future, simply run
letsencrypt-auto again. To non-interactively renew *all* of your
certificates, run "letsencrypt-auto 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
上記に表示されたディレクトリを確認すると、証明書ファイルを確認することが出来ます。
# cd /etc/letsencrypt/live/<ドメイン名>/
# ls -la
total 12
drwxr-xr-x 2 root root 4096 Nov 1 08:39 .
drwx------ 3 root root 4096 Nov 1 08:39 ..
-rw-r--r-- 1 root root 682 Nov 1 08:39 README
lrwxrwxrwx 1 root root 52 Nov 1 08:39 cert.pem -> ../../archive/<ドメイン名>/cert1.pem
lrwxrwxrwx 1 root root 53 Nov 1 08:39 chain.pem -> ../../archive/<ドメイン名>/chain1.pem
lrwxrwxrwx 1 root root 57 Nov 1 08:39 fullchain.pem -> ../../archive/<ドメイン名>/fullchain1.pem
lrwxrwxrwx 1 root root 55 Nov 1 08:39 privkey.pem -> ../../archive/<ドメイン名>/privkey1.pem