LetsEncrypt SSL 証明書の更新 (2026/02/01 実施)
February 1, 2026 – 6:01 pmSSL証明書の有効期限が本日 2月1日になっていることを失念。本サイト にアクセスできなくなっていた。
更新作業をしようにも、すべての記録はこのブログのなかにあるので、右往左往してしまった。
Googleで更新方法を確認し、なんとか更新作業を完了することができた。
以下、更新時のLogを転記しておく：
[root@Server01 ~]# certbot certonly --manual --preferred-challenges dns-01 -m yukichi.yamaguchi@yamasnet.com -d '*.yamasnet.com' Saving debug log to /var/log/letsencrypt/letsencrypt.log Renewing an existing certificate for *.yamasnet.com - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Please deploy a DNS TXT record under the name: _acme-challenge.yamasnet.com. with the following value: wCai_sjFIKlPO1Nsrj9Bt8LO_fkI3RnAy5i-vkPlGeM 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.yamasnet.com. Look for one or more bolded line(s) below the line ';ANSWER'. It should show the value(s) you've just added. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press Enter to Continue Successfully received certificate. Certificate is saved at: /etc/letsencrypt/live/yamasnet.com/fullchain.pem Key is saved at: /etc/letsencrypt/live/yamasnet.com/privkey.pem This certificate expires on 2026-05-02. 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. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 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 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
なお、これまでの更新作業は以下のコマンド列で行うことができる。これまでの作業記録にアクセスできず、多少、丁寧なものになっている。
[root@Server01 ~]# certbot certonly --manual
SSLが更新されたことを以下で確認：
[root@Server01 ~]# certbot certificates Saving debug log to /var/log/letsencrypt/letsencrypt.log - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Found the following certs: Certificate Name: yamasnet.com Serial Number: 66c6ccb953d6525f7d37170de4eee04e444 Key Type: ECDSA Domains: *.yamasnet.com Expiry Date: 2026-05-02 07:37:48+00:00 (VALID: 89 days) Certificate Path: /etc/letsencrypt/live/yamasnet.com/fullchain.pem Private Key Path: /etc/letsencrypt/live/yamasnet.com/privkey.pem - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -