Let’s Encrypt の証明書を手動（DNS-01）で発行した作業メモ

# dnf install -y epel-release

# dnf install certbot

# dnf install -y certbot python3-certbot-apache

certbot certonly   --manual   --preferred-challenges dns -d tec-memo.com

Enter email address (used for urgent renewal and security notices)

(Enter 'c' to cancel):メールアドレスを入力
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Please read the Terms of Service at

https://letsencrypt.org/documents/LE-SA-v1.6-August-18-2025.pdf.
letsencrypt.org You must agree
in order to register with the ACME server. Do you agree?
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(Y)es/(N)o: Y（② 利用規約への同意どちらでも可）

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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.
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(Y)es/(N)o: N（EFF への情報共有の可否どちらでも可）
Account registered.
Requesting a certificate for tec-memo.com

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Please deploy a DNS TXT record under the name:

_acme-challenge.tec-memo.com.

with the following value:

0eqpsertm560VEiLoaWsR3sdfeaw4DEwbDearfJfeiR

Before continuing, verify the TXT record has been deployed. Depending on the DNS
provider, this may take some time, from a few seconds to multiple minutes. You can
check if it has finished deploying with aid of online tools, such as the Google
Admin Toolbox: https://toolbox.googleapps.com/apps/dig/#TXT/_acme-challenge.tec-memo.com.
Look for one or more bolded line(s) below the line ';ANSWER'. It should show the
value(s) you've just added.
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Press Enter to Continue

_acme-challenge.tec-memo.com　CNAME 0eqpsertm560VEiLoaWsR3sdfeaw4DEwbDearfJfeiR

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Press Enter to Continue（DNS登録後、Enterを押す）
Certificate is saved at: /etc/letsencrypt/live/tec-memo.com/fullchain.pem
Key is saved at:         /etc/letsencrypt/live/tec-memo.com/privkey.pem
This certificate expires on 2026-06-23.
These files will be updated when the certificate renews.

NEXT STEPS:
- This certificate will not be renewed automatically. Autorenewal of --manual certificates requires the use of an authentication hook script (--manual-auth-hook) but one was not provided. To renew this certificate, repeat this same certbot command before the certificate's expiry date.

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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
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# ls -l /etc/letsencrypt/archive/tec-memo.com/
合計 16
-rw-r--r-- 1 root root 1285  3月 26 09:38 cert1.pem （サーバ証明書）
-rw-r--r-- 1 root root 1566  3月 26 09:38 chain1.pem（中間証明書チェーン）
-rw-r--r-- 1 root root 2851  3月 26 09:38 fullchain1.pem（サーバ証明書 + 中間証明書）
-rw------- 1 root root  227  3月 26 09:38 privkey1.pem（秘密鍵）