AlmaLinux release 8.5 (Arctic Sphynx) certbot 1.22.0 apache 2.4.37 postfix 3.5.8
Let’sEncryptの証明書を発行するためのcertbotをインストールする。
# dnf install epel-release # dnf install certbot
ACMEプロトコル用にApacheの設定を行う。
<VirtualHost *:80>
ServerName test.example.com
DocumentRoot /var/lib/letsencrypt/
<Directory /var/lib/letsencrypt/>
AllowOverride None
Options IncludesNoExec
Require method GET
</Directory>
</VirtualHost>
Apacheの設定を再読み込みする。
# systemctl reload httpd
SSL証明書を発行する。何度も失敗したりしても制限がかかるので、–dry-runオプションを指定してテストする。
# certbot certonly --webroot -w /var/lib/letsencrypt/ -d test.example.com ------------------------------------------------------------- Saving debug log to /var/log/letsencrypt/letsencrypt.log Enter email address (used for urgent renewal and security notices) (Enter 'c' to cancel): admin@test.example.com - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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. Do you agree? - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (Y)es/(N)o: Y - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Would you be willing, once your first certificate is successfully issued, 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. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - (Y)es/(N)o: N Account registered. Requesting a certificate for test.example.com Successfully received certificate. Certificate is saved at: /etc/letsencrypt/live/test.example.com/fullchain.pem Key is saved at: /etc/letsencrypt/live/test.example.com/privkey.pem This certificate expires on 2022-08-01. These files will be updated when the certificate renews. Certbot has set up a scheduled task to automatically renew this certificate in the background. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
発行が成功すると下記の場所に証明書が作られる。ほかのサーバーに移行する場合は/etc/letsencrypt/ごとコピーすればOKだった。
/etc/letsencrypt/live/test.example.com/cert.pem /etc/letsencrypt/live/test.example.com/privkey.pem /etc/letsencrypt/live/test.example.com/chain.pem /etc/letsencrypt/live/test.example.com/fullchain.pem
cronで毎朝4時にSSL証明書を更新するジョブを追加する。更新されるかは自動で決定され、更新された場合のみ–deploy-hookオプションで指定されたコマンドが実行される。
0 4 * * * certbot renew --deploy-hook "systemctl reload postfix"
Postfixのmain.cfを編集して証明書の設定をする。
※変更箇所のみ記載
# Certificate settings. smtpd_tls_cert_file = /etc/letsencrypt/live/test.example.com/fullchain.pem smtpd_tls_key_file = /etc/letsencrypt/live/test.example.com/privkey.pem