Buypassを使うと期限を180日にできる

$ acme.sh --set-default-ca --server buypass
Changed default CA to: https://api.buypass.com/acme/directory

# acme.sh --register-account -m yourname@example.com
[...... 2022] Registering account: https://api.buypass.com/acme/directory                                　  
[...... 2022] Registered                                                                               　 
[...... 2022] ACCOUNT_THUMBPRINT='-DxxxxxxxAAAAAAAABBBBBBBBBBBBBBbCCCCCCCC'   

DNSモードで行う

# acme.sh --server https://api.buypass.com/acme/directory --issue --dns -d sample.example.com --days 180 --yes-I-know-dns-manual-mode-enough-go-ahead-please 
[...... 2022] Using CA: https://api.buypass.com/acme/directory
.....
[...... 2022] Add the following TXT record:
[...... 2022] Domain: '_acme-challenge.sample.example.com'
[...... 2022] TXT value: 'QQQQQQNNNNNNNN-28AAABBBBCCCCDDDDEEEEFFFF4'
.....

表示されたトークンをDNSに登録¹⁾

_acme-challenge.sample.example.com.    IN TXT "QQQQQQNNNNNNNN-28AAABBBBCCCCDDDDEEEEFFFF4"

発行

# acme.sh --server https://api.buypass.com/acme/directory --issue --renew --dns -d sample.example.com --days 180 --yes-I-know-dns-manual-mode-enough-go-ahead-please
Renew: 'sample.example.com'
Using CA: https://api.buypass.com/acme/directory
......
Success
......
Cert success.
[証明書表示]
......

以下のファイルが作成されている

ca.cer
fullchain.cer
sample.example.com.cer
sample.example.com.conf
sample.example.com.csr
sample.example.com.csr.conf
sample.example.com.key

今回は、nginxのproxyで使用するので以下のようにコピーする²⁾

cp fullchain.cer /PATH/to/cert/sample.example.com.cer
cp sample.example.com.key /PATH/to/cert/sample.example.com

³⁾

これで良いはず⁴⁾

# acme.sh --server https://api.buypass.com/acme/directory --issue --renew --dns -d sample.example.com --days 180 --yes-I-know-dns-manual-mode-enough-go-ahead-please --force

新しい証明書発行されるのでコピーしてreload