目次
CentOS 8.1.1911にDocker CEをインストールしようとしたらつまずいたので何とかした
そろそろCentOS 8に慣れないとなぁと思い、ローカルのDocker環境を置き換えよう、と思い立ったのですがいざインストールしてみるとうまくいかず・・・
色々と探してみたところ、libpodのGitHub Issues #4791にたどり着きました。
本記事では備忘も兼ねて上記を参考にしてCentOS 8.1.1911にDocker CEをインストールする手順を紹介します。
リポジトリの追加
CentOS8にDocker CEをインストールするにはまずリポジトリの追加を行います。
sudo dnf config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo dnf update
Docker CEをインストールすると依存関係でエラーに
Docker CEですが、記事執筆段階では下記の様に依存関係でDocker CEの最新バージョンがインストールできないようなので
Problem 1: package docker-ce-3:19.03.5-3.el7.x86_64 requires containerd.io >= 1.2.2-3, but none of the providers can be installed - cannot install the best candidate for the job - package containerd.io-1.2.10-3.2.el7.x86_64 is excluded - package containerd.io-1.2.2-3.3.el7.x86_64 is excluded - package containerd.io-1.2.2-3.el7.x86_64 is excluded - package containerd.io-1.2.4-3.1.el7.x86_64 is excluded - package containerd.io-1.2.5-3.1.el7.x86_64 is excluded - package containerd.io-1.2.6-3.3.el7.x86_64 is excluded
–nobestオプションを付けて、依存関係を解決したインストールを行います。
sudo dnf install -y --nobest docker-ce docker-ce-cli
依存関係の次はpodmanとコンフリクトを起こすように・・・
依存関係が解決したからインストールできるだろう！と思い再度実行すると今度はpodman-manpagesとコンフリクトが発生してしまいます・・・
$ sudo dnf install -y --nobest docker-ce docker-ce-cli CentOS-8 - AppStream 12 kB/s | 4.3 kB 00:00 CentOS-8 - Base 11 kB/s | 3.8 kB 00:00 CentOS-8 - Extras 4.2 kB/s | 1.5 kB 00:00 Docker CE Stable - x86_64 96 kB/s | 3.5 kB 00:00 Dependencies resolved. ================================================================================ Package Arch Version Repository Size ================================================================================ Installing: docker-ce x86_64 3:19.03.5-3.el7 docker-ce-stable 24 M Installing dependencies: libcgroup x86_64 0.41-19.el8 BaseOS 70 k docker-ce-cli x86_64 1:19.03.5-3.el7 docker-ce-stable 39 M Transaction Summary ================================================================================ Install 3 Packages Total download size: 64 M Installed size: 273 M Downloading Packages: (1/3): libcgroup-0.41-19.el8.x86_64.rpm 1.0 MB/s | 70 kB 00:00 (2/3): docker-ce-cli-19.03.5-3.el7.x86_64.rpm 44 MB/s | 39 MB 00:00 (3/3): docker-ce-19.03.5-3.el7.x86_64.rpm 23 MB/s | 24 MB 00:01 -------------------------------------------------------------------------------- Total 50 MB/s | 64 MB 00:01 Running transaction check Transaction check succeeded. Running transaction test The downloaded packages were saved in cache until the next successful transaction. You can remove cached packages by executing 'dnf clean packages'. Error: Transaction check error: file /usr/share/man/man1/docker-attach.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-build.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-commit.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-container-prune.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-container.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-cp.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-create.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-diff.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-events.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-exec.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-export.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-history.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-image-prune.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-image.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-images.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-import.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-info.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-inspect.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-kill.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-load.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-login.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-logout.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-logs.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-pause.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-port.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-ps.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-pull.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-push.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-restart.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-rm.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-rmi.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-run.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-save.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-search.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-start.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-stats.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-stop.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-system-df.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-system-prune.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-system.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-tag.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-top.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-unpause.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-version.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume-create.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume-inspect.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume-ls.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume-prune.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume-rm.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-volume.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker-wait.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch file /usr/share/man/man1/docker.1.gz from install of docker-ce-cli-1:19.03.5-3.el7.x86_64 conflicts with file from package podman-manpages-1.4.2-5.module_el8.1.0+237+63e26edc.noarch
そこで、冒頭で紹介したIssuesに載っている対処を行います。
[対処]Docker CEのインストール
まずは下記コマンドでpodmanのパッケージを一旦アンインストールします。
sudo dnf clean packages sudo yum -y remove podman
続いて、下記コマンドを実行してman page無しでpodmanの依存関係パッケージをインストールします。
sudo yum -y install oci-systemd-hook libvarlink
そして下記コマンドを実行して依存関係を解決せずにpodmanパッケージをインストールします。
sudo rpm -Uvh --nodeps $(repoquery --location podman)
そして最後に下記コマンドを実行することで、Docker CEのインストールおよび、サービスの登録、起動を行う事ができます。
sudo dnf install -y --nobest docker-ce docker-ce-cli sudo systemctl enable docker sudo systemctl start docker
上記手順でインストールを行うとDocker CE 19.03.5. build 633a0eaがインストースされます。（2020/02/04現在）
$ docker --version Docker version 19.03.5, build 633a0ea
まとめ
CentOS 6もそろそろサポート切れるし、いっその事CentOS8を入れてみるかぁと思って試したところ多いにドはまりしてしまいました・・・
この記事が1人でも多くの方の役に立てば幸いです。
