CentOS Stream 8のイメージは公式に提供されていない
CentOS Streamへの移行が推奨されるということで試したくなった人も多いかと思います。しかし表題の通り、CentOS Stream 8はEC2 AMIやGCE Imageが公式に提供されていません。ですが、かんたんな操作でCentOS8からCentOS Stream 8への変更が可能です。
この方法でCentOS Stream 8インスタンスを作ったら、いつものようにインスタンスイメージとして作成すれば使えるようになります。
なお、CentOS8 AMIはここで公式配布されています。 https://aws.amazon.com/marketplace/pp/B08KYLN2CG
切替方法
公式ページにも案内がありますが、centos-release-streamパッケージをインストールして、dnf distro-syncを実行すれば終わります。
# dnf install centos-release-stream
# dnf distro-sync
# cat /etc/centos-release
CentOS Stream release 8
https://www.centos.org/centos-stream/ より
実際に実行してみましょう
$ cat /etc/redhat-release # ←現在のバージョンはCentOS 8.3.2011
CentOS Linux release 8.3.2011
$ uname -a
Linux ip-172-31-41-96.ap-northeast-1.compute.internal 4.18.0-240.1.1.el8_3.aarch64 #1 SMP Thu Nov 19 22:13:39 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux
$ sudo dnf install centos-release-stream # ← centos
CentOS Linux 8 - AppStream 14 MB/s | 5.2 MB 00:00
CentOS Linux 8 - BaseOS 3.7 MB/s | 1.9 MB 00:00
Dependencies resolved.
========================================================================================================================
Package Architecture Version Repository Size
========================================================================================================================
Installing:
centos-release-stream aarch64 8.1-1.1911.0.7.el8 extras 11 k
Transaction Summary
========================================================================================================================
Install 1 Package
Total download size: 11 k
Installed size: 6.6 k
Is this ok [y/N]: y
Downloading Packages:
centos-release-stream-8.1-1.1911.0.7.el8.aarch64.rpm 53 kB/s | 11 kB 00:00
------------------------------------------------------------------------------------------------------------------------
Total 22 kB/s | 11 kB 00:00
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : centos-release-stream-8.1-1.1911.0.7.el8.aarch64 1/1
Verifying : centos-release-stream-8.1-1.1911.0.7.el8.aarch64 1/1
Installed:
centos-release-stream-8.1-1.1911.0.7.el8.aarch64
Complete!
$ sudo dnf distro-sync
CentOS-Stream - AppStream 3.2 MB/s | 5.3 MB 00:01
CentOS-Stream - Base 1.4 MB/s | 1.9 MB 00:01
CentOS-Stream - Extras 7.8 kB/s | 6.9 kB 00:00
Dependencies resolved.
========================================================================================================================
Package Arch Version Repository Size
========================================================================================================================
Installing:
centos-stream-release noarch 8.4-1.el8 Stream-BaseOS 21 k
replacing centos-linux-release.noarch 8.3-1.2011.el8
replacing centos-release-stream.aarch64 8.1-1.1911.0.7.el8
Upgrading:
NetworkManager aarch64 1:1.30.0-0.2.el8 Stream-BaseOS 2.3 M
NetworkManager-libnm aarch64 1:1.30.0-0.2.el8 Stream-BaseOS 1.7 M
（略）
Transaction Summary
========================================================================================================================
Install 9 Packages
Upgrade 79 Packages
Total download size: 200 M
Is this ok [y/N]: y
Downloading Packages:
(1/88): python3-ethtool-0.14-3.el8.aarch64.rpm 303 kB/s | 45 kB 00:00
(2/88): python3-iniparse-0.4-31.el8.noarch.rpm 109 kB/s | 49 kB 00:00
（略）
------------------------------------------------------------------------------------------------------------------------
Total 9.5 MB/s | 200 MB 00:21
（略）
Complete!
$ cat /etc/redhat-release # ←CentOS Stream 8になった!
CentOS Stream release 8
（OSを再起動する）
$ uname -a # ← カーネルは変わらず
Linux ip-172-31-41-96.ap-northeast-1.compute.internal 4.18.0-240.1.1.el8_3.aarch64 #1 SMP Thu Nov 19 22:13:39 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux