更新: 2026年1月30日
自己署名証明書の代わりに、Let's Encryptによって発行された証明書に置き換えます。
DNSにコンピュート・インスタンスのホスト名とパブリックIPアドレスが登録され、どこからでもホスト名からIPアドレスが解決できる状態になっていることが前提条件です。
firewalldの構成
httpのサービスで接続できるようにします。
firewall-cmd --add-service=httpfirewall-cmd --runtime-to-permanent
firewall-cmd --reload
firewall-cmd --list-all
ORDSを実装したコンピュート・インスタンスにログインし、ユーザーrootにて上記のコマンドを実行します。
[root@cmords-arm ~]# firewall-cmd --add-service=http
success
[root@cmords-arm ~]# firewall-cmd --runtime-to-permanent
success
[root@cmords-arm ~]# firewall-cmd --reload
success
[root@cmords-arm ~]# firewall-cmd --list-all
public (default, active)
target: default
ingress-priority: 0
egress-priority: 0
icmp-block-inversion: no
interfaces: enp0s6
sources:
services: dhcpv6-client http https ssh
ports:
protocols:
forward: yes
masquerade: no
forward-ports:
port=443:proto=tcp:toport=8443:toaddr=
source-ports:
icmp-blocks:
rich rules:
[root@cmords-arm ~]#
Certbotのインストール
dnf repolist --all | grep EPEL
デフォルトではdisabledになっています。
[root@cmords-arm ~]# dnf repolist --all | grep EPEL
ol10_u0_developer_EPEL Oracle Linux 10.0 EPEL Packages for Deve disabled
[root@cmords-arm ~]#
dnf --enablerepo=ol10_u0_developer_EPEL -y install certbot
[root@cmords-arm ~]# dnf --enablerepo=ol10_u0_developer_EPEL -y install certbot
Oracle Linux 10.0 EPEL Packages for Development (aarch64) 35 MB/s | 5.9 MB 00:00
Last metadata expiration check: 0:00:01 ago on Fri 30 Jan 2026 11:31:02 AM GMT.
Dependencies resolved.
===================================================================================================
Package Arch Version Repository Size
===================================================================================================
Installing:
certbot noarch 4.2.0-1.el10_0 ol10_u0_developer_EPEL 75 k
Upgrading:
python3-pyOpenSSL noarch 25.0.0-1.el10_0 ol10_u0_developer_EPEL 155 k
Installing dependencies:
fontawesome4-fonts noarch 1:4.7.0-23.el10 ol10_appstream 208 k
python3-acme noarch 4.2.0-1.el10_0 ol10_u0_developer_EPEL 334 k
python3-certbot noarch 4.2.0-1.el10_0 ol10_u0_developer_EPEL 1.3 M
python3-configargparse noarch 1.7.1-1.el10_0 ol10_u0_developer_EPEL 67 k
python3-josepy noarch 2.0.0-2.el10_0 ol10_u0_developer_EPEL 116 k
python3-parsedatetime noarch 2.6-1.el10_0 ol10_u0_developer_EPEL 149 k
python3-pyrfc3339 noarch 1.1-20.el10_0 ol10_u0_developer_EPEL 40 k
Transaction Summary
===================================================================================================
Install 8 Packages
Upgrade 1 Package
Total download size: 2.4 M
Downloading Packages:
(1/9): certbot-4.2.0-1.el10_0.noarch.rpm 420 kB/s | 75 kB 00:00
(2/9): python3-acme-4.2.0-1.el10_0.noarch.rpm 1.5 MB/s | 334 kB 00:00
(3/9): python3-configargparse-1.7.1-1.el10_0.noarch.rpm 998 kB/s | 67 kB 00:00
(4/9): python3-parsedatetime-2.6-1.el10_0.noarch.rpm 9.5 MB/s | 149 kB 00:00
(5/9): python3-pyrfc3339-1.1-20.el10_0.noarch.rpm 3.5 MB/s | 40 kB 00:00
(6/9): python3-josepy-2.0.0-2.el10_0.noarch.rpm 1.7 MB/s | 116 kB 00:00
(7/9): fontawesome4-fonts-4.7.0-23.el10.noarch.rpm 12 MB/s | 208 kB 00:00
(8/9): python3-pyOpenSSL-25.0.0-1.el10_0.noarch.rpm 1.3 MB/s | 155 kB 00:00
(9/9): python3-certbot-4.2.0-1.el10_0.noarch.rpm 2.8 MB/s | 1.3 MB 00:00
---------------------------------------------------------------------------------------------------
Total 5.2 MB/s | 2.4 MB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : python3-pyrfc3339-1.1-20.el10_0.noarch 1/10
Installing : python3-josepy-2.0.0-2.el10_0.noarch 2/10
Upgrading : python3-pyOpenSSL-25.0.0-1.el10_0.noarch 3/10
Installing : python3-acme-4.2.0-1.el10_0.noarch 4/10
Installing : fontawesome4-fonts-1:4.7.0-23.el10.noarch 5/10
Installing : python3-parsedatetime-2.6-1.el10_0.noarch 6/10
Installing : python3-configargparse-1.7.1-1.el10_0.noarch 7/10
Installing : python3-certbot-4.2.0-1.el10_0.noarch 8/10
Installing : certbot-4.2.0-1.el10_0.noarch 9/10
Running scriptlet: certbot-4.2.0-1.el10_0.noarch 9/10
Created symlink '/etc/systemd/system/timers.target.wants/certbot-renew.timer' → '/usr/lib/systemd/system/certbot-renew.timer'.
Certbot auto renewal timer is not started by default.
Run 'systemctl start certbot-renew.timer' to enable automatic renewals.
Cleanup : python3-pyOpenSSL-24.2.1-1.0.1.el10.noarch 10/10
Running scriptlet: python3-pyOpenSSL-24.2.1-1.0.1.el10.noarch 10/10
Upgraded:
python3-pyOpenSSL-25.0.0-1.el10_0.noarch
Installed:
certbot-4.2.0-1.el10_0.noarch fontawesome4-fonts-1:4.7.0-23.el10.noarch
python3-acme-4.2.0-1.el10_0.noarch python3-certbot-4.2.0-1.el10_0.noarch
python3-configargparse-1.7.1-1.el10_0.noarch python3-josepy-2.0.0-2.el10_0.noarch
python3-parsedatetime-2.6-1.el10_0.noarch python3-pyrfc3339-1.1-20.el10_0.noarch
Complete!
[root@cmords-arm ~]#
Let's Encryptからの証明書取得
[root@cmords-arm ~]# host ホスト名
ホスト名 has address IPアドレス
[root@cmords-arm ~]#
/etc/letsencrypt/live/ホスト名/fullchain.pem
/etc/letsencrypt/live/ホスト名/privkey.pem
[root@cmords-arm ~]# certbot certonly --standalone --key-type rsa
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Enter email address or hit Enter to skip.
(Enter 'c' to cancel): メール・アドレス
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Please read the Terms of Service at:
https://letsencrypt.org/documents/LE-SA-v1.6-August-18-2025.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.
Please enter the domain name(s) you would like on your certificate (comma and/or
space separated) (Enter 'c' to cancel): ホスト名
Requesting a certificate for ホスト名
Successfully received certificate.
Certificate is saved at: /etc/letsencrypt/live/ホスト名/fullchain.pem
Key is saved at: /etc/letsencrypt/live/ホスト名/privkey.pem
This certificate expires on 2026-04-30.
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
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
[root@cmords-arm ~]#
setfacl -m u:oracle:rx /etc/letsencrypt/archive
setfacl -m u:oracle:r `readlink -f /etc/letsencrypt/live/ホスト名/privkey.pem`
getfacl /etc/letsencrypt/live
getfacl -R /etc/letsencrypt/archive
[root@cmords-arm ~]# setfacl -m u:oracle:rx /etc/letsencrypt/live
[root@cmords-arm ~]# setfacl -m u:oracle:rx /etc/letsencrypt/archive
[root@cmords-arm ~]# setfacl -m u:oracle:r `readlink -f /etc/letsencrypt/live/ホスト名/privkey.pem`
[root@cmords-arm ~]# getfacl /etc/letsencrypt/live
getfacl: Removing leading '/' from absolute path names
# file: etc/letsencrypt/live
# owner: root
# group: root
user::rwx
user:oracle:r-x
group::---
mask::r-x
other::---
[root@cmords-arm ~]# getfacl -R /etc/letsencrypt/archive
getfacl: Removing leading '/' from absolute path names
# file: etc/letsencrypt/archive
# owner: root
# group: root
user::rwx
user:oracle:r-x
group::---
mask::r-x
other::---
# file: etc/letsencrypt/archive/ホスト名
# owner: root
# group: root
user::rwx
group::r-x
other::r-x
# file: etc/letsencrypt/archive/ホスト名/cert1.pem
# owner: root
# group: root
user::rw-
group::r--
other::r--
# file: etc/letsencrypt/archive/ホスト名/privkey1.pem
# owner: root
# group: root
user::rw-
user:oracle:r--
group::---
mask::r--
other::---
# file: etc/letsencrypt/archive/ホスト名/chain1.pem
# owner: root
# group: root
user::rw-
group::r--
other::r--
# file: etc/letsencrypt/archive/ホスト名/fullchain1.pem
# owner: root
# group: root
user::rw-
group::r--
other::r--
[root@cmords-arm ~]#
wc -l /etc/letsencrypt/live/ホスト名/privkey.pem
[root@cmords-arm ~]# su - oracle
Last login: Fri Jan 30 12:01:38 GMT 2026 on pts/1
[oracle@cmords-arm ~]$ wc -l /etc/letsencrypt/live/ホスト名/fullchain.pem
58 /etc/letsencrypt/live/ホスト名/fullchain.pem
[oracle@cmords-arm ~]$ wc -l /etc/letsencrypt/live/ホスト名/privkey.pem
28 /etc/letsencrypt/live/ホスト名/privkey.pem
[oracle@cmords-arm ~]$
ORDSの構成変更
ords --config /etc/ords/config config set --global standalone.https.host ホスト名
ords --config /etc/ords/config config set --global standalone.https.cert /etc/letsencrypt/live/ホスト名/fullchain.pem
ords --config /etc/ords/config config set --global standalone.https.cert.key /etc/letsencrypt/live/ホスト名/privkey.pem
ords --config /etc/ords/config config set --global standalone.https.port 8443
[oracle@cmords-arm ~]$ cd /etc/ords/config
[oracle@cmords-arm config]$ ords --config /etc/ords/config config set --global standalone.https.host ホスト名
ORDS: Release 25.4 Production on Fri Jan 30 12:19:52 2026
Copyright (c) 2010, 2026, Oracle.
Configuration:
/etc/ords/config
The global setting named: standalone.https.host was set to: ホスト名
[oracle@cmords-arm config]$ ords --config /etc/ords/config config set --global standalone.https.cert /etc/letsencrypt/live/ホスト名/fullchain.pem
ORDS: Release 25.4 Production on Fri Jan 30 12:20:33 2026
Copyright (c) 2010, 2026, Oracle.
Configuration:
/etc/ords/config
The global setting named: standalone.https.cert was set to: /etc/letsencrypt/live/ホスト名/fullchain.pem
[oracle@cmords-arm config]$ ords --config /etc/ords/config config set --global standalone.https.cert.key /etc/letsencrypt/live/ホスト名/privkey.pem
ORDS: Release 25.4 Production on Fri Jan 30 12:21:01 2026
Copyright (c) 2010, 2026, Oracle.
Configuration:
/etc/ords/config
The global setting named: standalone.https.cert.key was set to: /etc/letsencrypt/live/ホスト名/privkey.pem
[oracle@cmords-arm config]$ ords --config /etc/ords/config config set --global standalone.https.port 8443
ORDS: Release 25.4 Production on Fri Jan 30 12:58:42 2026
Copyright (c) 2010, 2026, Oracle.
Configuration:
/etc/ords/config
No updates required to setting named standalone.https.port in global configuration because the values are the same.
[oracle@cmords-arm config]$
[root@cmords-arm ~]# systemctl restart ords
[root@cmords-arm ~]#
以上でLet's Encryptにて発行されたサーバー証明書を使うようになりました。