Memo/Linux/AlmaLinux/9

AlmaLinux 9
- RHELの過去バージョンとの変更点
- 気になった変更点

AlmaLinux 9 †

記事:

AlmaLinux 9 : ダウンロード : Server World

とほほのRHEL 9入門 - とほほのWWW入門

↑

RHELの過去バージョンとの変更点 †

記事:

RHEL5,6,7,8,9で変更された主要まとめ #初心者 - Qiita

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気になった変更点 †

# 以下AWS ec2での検証

自動実行されるタスクの確認。cron以外に、systemd.timerがある。例: logrotate.timer のようにcronからsystemd.timerへ変わったものがある。

systemctl list-timers

NEXT                        LEFT          LAST                        PASSED       UNIT                         ACTIVATES
Fri 2024-11-29 01:46:48 UTC 4min 55s left Fri 2024-11-29 01:41:48 UTC 4s ago       nm-cloud-setup.timer         nm-cloud-setup.service
Fri 2024-11-29 02:40:33 UTC 58min left    Fri 2024-11-29 00:47:00 UTC 54min ago    dnf-makecache.timer          dnf-makecache.service
Fri 2024-11-29 06:12:02 UTC 4h 30min left Thu 2024-11-28 06:12:02 UTC 19h ago      systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
Sat 2024-11-30 00:00:00 UTC 22h left      Fri 2024-11-29 00:00:01 UTC 1h 41min ago logrotate.timer              logrotate.service
Sat 2024-11-30 00:00:00 UTC 22h left      Fri 2024-11-29 00:00:01 UTC 1h 41min ago mlocate-updatedb.timer       mlocate-updatedb.service

最小メモリ: 1.5GB程
- 16.2. システムの推奨スワップ領域 | Red Hat Product Documentation
- 2.2. 無効にしても安全なサービスを選択するためのガイド | Red Hat Product Documentation

dnfコマンド実行時に、1GBほどメモリを消費し、OOM killerが発生し停止する。
- 物理メモリが少ない環境の場合、swapfileを2GB程用意したり、dnf-makecache.timer(1,2時間毎に自動実行)を停止する。
- AlmaLinux 9 のサーバが時々長時間応答しなくなる原因が (たぶん) dnf makecache だった
```
sudo systemctl stop dnf-makecache.timer
sudo systemctl disable dnf-makecache.timer
```

RSA/SHA1(ssh-rsa)鍵がデフォルトで無効になった
- SHA256, ECDSA, ED25519 は使える
- 3.9. SHA-1 を再度有効に Red Hat Enterprise Linux 9 | Red Hat Customer Portal
- 確認方法: 公開鍵, 秘密鍵両対応
```
ssh-keygen -l -f ~/.ssh/id_rsa.pub
```

default user:
- AWS ec2: ec2-user

locale: C.UTF-8のみ

localectl list-locales

C.UTF-8

# 追加したい場合
sudo yum search locale | grep -P "\-ja|\-en"

glibc-langpack-en.x86_64 : Locale data for English
glibc-langpack-ja.x86_64 : Locale data for Japanese

sudo yum install glibc-langpack-en
sudo localectl set-locale LANG=en_US.utf8

logrotateの起動がcronから、systemd-timerへ変更されている
- EL7: /etc/cron.daily/logrotate
- EL9: sudo service logrotate status
- Red Hat Enterprise Linux 9でlogrotateを使ってログファイルを1時間ごとにローテーションさせてみた | DevelopersIO

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Memo/Linux/AlmaLinux/9

AlmaLinux 9 †

RHELの過去バージョンとの変更点 †

気になった変更点 †

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