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Apache2: Let's Encrypt で SAN 証明書を使う

Last updated at Posted at 2020-08-30

SAN(Subject Alternative Name)証明書の使い方です。
Ubuntu 20.04 で確認しました。

コマンドのインストール

sudo apt install certbot

次の4つのドメインが同じIPに割り当てられているとします。

test.example.com
test2.example.com
test3.example.com
test4.example.com

証明書の取得

folder="/var/www/html/public_test"
mail="admin@example.com"

certbot certonly \
        --webroot -w $folder -d test.example.com \
        --webroot -w $folder -d test2.example.com \
        --webroot -w $folder -d test3.example.com \
        --webroot -w $folder -d test4.example.com \
        --email $mail

このコマンドを実行すると、
/etc/letsencrypt/live/test.example.com
に証明書が作成されます。

Apache2 の設定ファイル

/etc/apache2/sites-available/test.example.com-le-ssl.conf
<IfModule mod_ssl.c>

<VirtualHost *:443>
        ServerName test.example.com
        ServerAlias test2.example.com
        ServerAlias test3.example.com
        ServerAlias test4.example.com
        DocumentRoot /var/www/html/public_test

        ErrorLog ${APACHE_LOG_DIR}/error_ssl.log
        CustomLog ${APACHE_LOG_DIR}/access_ssl.log combined

        <Directory /var/www/html/public_test>
        AllowOverride none
        Require all granted
        </Directory>

SSLCertificateFile /etc/letsencrypt/live/test.example.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/test.example.com/privkey.pem

Include /etc/letsencrypt/options-ssl-apache.conf
</VirtualHost>

</IfModule>

シンボリックリンクの作成

cd /etc/apache2/sites-enabled
sudo ln -s ../test.example.com-le-ssl.conf .

設定の確認

sudo apache2ctl configtest


Apache2 の再起動

>```bash
sudo systemctl restart apache2

証明書の取得は次のようにすることもできます。

folder="/var/www/html/public_test"
mail="admin@example.com"

certbot certonly \
        --apache -d test.example.com \
        --apache -d test2.example.com \
        --apache -d test3.example.com \
        --apache -d test4.example.com \
        --email $mail

次のライブラリーをインストールする必要があります。

sudo apt install python3-certbot-apache
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