ワイルドカード証明書
Let's Encrypt がワイルドカード証明書の発行を開始すると言っていたのを思い出したので, 発行開始からは時間が経ってしまいましたが, このサイトのために取得してみました. 発行は2018年の3月から開始されたようです.
方法
# certbot certonly --manual \
-d *.example.com \
-m <email address> \
--agree-tos \
--manual-public-ip-logging-ok \
--server https://acme-v02.api.letsencrypt.org/directory
を実行すると次のような出力が得られるので,
Performing the following challenges:
dns-01 challenge for example.com
-------------------------------------------------------------------------------
Please deploy a DNS TXT record under the name
_acme-challenge.example.com with the following value:
9tfY4w_JWS8d-RYCxccIt5yXfdaHhNADBwJORLwAS9E
Before continuing, verify the record is deployed.
-------------------------------------------------------------------------------
Press Enter to Continue
ドメインのゾーン情報に
- エントリ:
_acme-challenge.example.com - 種別: TXT (テキスト)
- 値:
9tfY4w_JWS8d-RYCxccIt5yXfdaHhNADBwJORLwAS9E
を追加して ENTER を押下します. 次のような出力が得られれば成功です.
Waiting for verification...
Cleaning up challenges
IMPORTANT NOTES:
- Congratulations! Your certificate and chain have been saved at:
/etc/letsencrypt/live/example.com/fullchain.pem
Your key file has been saved at:
/etc/letsencrypt/live/example.com/privkey.pem
Your cert will expire on 2018-10-04. To obtain a new or tweaked
version of this certificate in the future, simply run certbot
again. To non-interactively renew *all* of your certificates, run
"certbot renew"
- 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