15秒でわかるLet's Encryptのしくみ～無料で複数ドメイン有効な証明書作成～ ref: http://qiita.com/S-T/items/7ede1ccfae6fc7f08393

file0.txt

tsukada.test.jp
sumito.test.jp
coco.test.jp

file1.txt

cd /usr/local/src
git clone https://github.com/certbot/certbot
cd certbot/
./certbot-auto certonly --no-self-upgrade -n --webroot --agree-tos --email webadmin@test.jp -w /var/www/html -d tsukada.test.jp -d sumito.test.jp -d coco.test.jp --expand

file2.txt

# crontab -l
0 1 1 * * /usr/local/src/certbot/certbot-auto renew --force-renew && service httpd restart