Docker Community EditionをRHEL7に導入しました。
以下のCentOSの手順を参考にしましたが、そのままでは動かないところがあったので、参考までに記録を残しました。
そもそもRHELがサポートされていないようにも思えますので、ご利用条件などはご自身でご確認ください。
一般的にdockerを使いたいということであれば、RHEL7.xの標準yumパッケージとして存在するdockerを入れるのが本来的かと思います。ただ、CEではないので若干古いものになると思われます。以下は標準yumパッケージのdockerを導入する記事です。
■環境
RHEL 7.9
Docker CE 3:20.10.5-3.el7
前提環境の準備
既存のdockerが導入されていないことを以下で確認します。
コマンド
yum list installed|grep docker
結果
[root@anaconda ~]# yum list installed|grep docker
[root@anaconda ~]#
yumにDockerのレポジトリを追加
導入方法はいくつかありますが、ここではyumにDockerのレポジトリを追加する方法で導入します。
yum-utils パッケージ (yum-config-manager ユーティリティ) をインストールします。
コマンド
sudo yum install -y yum-utils
結果
[root@anaconda ~]# sudo yum install -y yum-utils
Loaded plugins: product-id, search-disabled-repos, subscription-manager
rhel-7-server-optional-rpms | 1.8 kB 00:00:00
rhel-7-server-rpms | 2.0 kB 00:00:00
rhel-7-server-supplementary-rpms | 2.0 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package yum-utils.noarch 0:1.1.31-54.el7_8 will be installed
--> Processing Dependency: python-kitchen for package: yum-utils-1.1.31-54.el7_8.noarch
--> Running transaction check
---> Package python-kitchen.noarch 0:1.1.1-5.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
========================================================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================================================
Installing:
yum-utils noarch 1.1.31-54.el7_8 rhel-7-server-rpms 122 k
Installing for dependencies:
python-kitchen noarch 1.1.1-5.el7 rhel-7-server-rpms 266 k
Transaction Summary
========================================================================================================================================================================================================
Install 1 Package (+1 Dependent package)
Total download size: 388 k
Installed size: 1.7 M
Downloading packages:
warning: /var/cache/yum/x86_64/7Server/rhel-7-server-rpms/packages/python-kitchen-1.1.1-5.el7.noarch.rpm: Header V3 RSA/SHA256 Signature, key ID fd431d51: NOKEY
Public key for python-kitchen-1.1.1-5.el7.noarch.rpm is not installed
(1/2): python-kitchen-1.1.1-5.el7.noarch.rpm | 266 kB 00:00:00
(2/2): yum-utils-1.1.31-54.el7_8.noarch.rpm | 122 kB 00:00:00
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 1.0 MB/s | 388 kB 00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Importing GPG key 0xFD431D51:
Userid : "Red Hat, Inc. (release key 2) <security@redhat.com>"
Fingerprint: 567e 347a d004 4ade 55ba 8a5f 199e 2f91 fd43 1d51
Package : redhat-release-server-7.9-3.el7.x86_64 (installed)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Importing GPG key 0x2FA658E0:
Userid : "Red Hat, Inc. (auxiliary key) <security@redhat.com>"
Fingerprint: 43a6 e49c 4a38 f4be 9abf 2a53 4568 9c88 2fa6 58e0
Package : redhat-release-server-7.9-3.el7.x86_64 (installed)
From : /etc/pki/rpm-gpg/RPM-GPG-KEY-redhat-release
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : python-kitchen-1.1.1-5.el7.noarch 1/2
Installing : yum-utils-1.1.31-54.el7_8.noarch 2/2
Verifying : python-kitchen-1.1.1-5.el7.noarch 1/2
Verifying : yum-utils-1.1.31-54.el7_8.noarch 2/2
rhel-7-server-rpms/7Server/x86_64/productid | 2.1 kB 00:00:00
rhel-7-server-supplementary-rpms/7Server/x86_64/productid | 2.1 kB 00:00:00
Installed:
yum-utils.noarch 0:1.1.31-54.el7_8
Dependency Installed:
python-kitchen.noarch 0:1.1.1-5.el7
Complete!
導入のためにはRed Hat Enterprise Linux 7 Server - Extras (RPMs)を有効にする必要がありました。overlayのドライバーなどはここから導入されます。
コマンド
sudo subscription-manager repos --enable rhel-7-server-extras-rpms
結果
[root@anaconda ~]# sudo subscription-manager repos --enable rhel-7-server-extras-rpms
Repository 'rhel-7-server-extras-rpms' is enabled for this system.
Dockerのリポジトリを設定します。
コマンド
sudo yum-config-manager \
--add-repo \
https://download.docker.com/linux/centos/docker-ce.repo
yum repolist all
結果
[root@anaconda ~]# sudo yum-config-manager \
> --add-repo \
> https://download.docker.com/linux/centos/docker-ce.repo
Loaded plugins: product-id, subscription-manager
adding repo from: https://download.docker.com/linux/centos/docker-ce.repo
grabbing file https://download.docker.com/linux/centos/docker-ce.repo to /etc/yum.repos.d/docker-ce.repo
repo saved to /etc/yum.repos.d/docker-ce.repo
[root@anaconda ~]# yum repolist all
Loaded plugins: product-id, search-disabled-repos, subscription-manager
https://download.docker.com/linux/centos/7Server/x86_64/stable/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.
To address this issue please refer to the below knowledge base article
https://access.redhat.com/articles/1320623
If above article doesn't help to resolve this issue please open a ticket with Red Hat Support.
https://download.docker.com/linux/centos/7Server/x86_64/stable/repodata/repomd.xml: [Errno 14] HTTPS Error 404 - Not Found
Trying other mirror.
rhel-7-server-optional-rpms/7Server/x86_64 | 1.8 kB 00:00:00
rhel-7-server-rpms/7Server/x86_64 | 2.0 kB 00:00:00
rhel-7-server-supplementary-rpms/7Server/x86_64 | 2.0 kB 00:00:00
repo id repo name status
docker-ce-nightly/7Server/x86_64 Docker CE Nightly - x86_64 disabled
docker-ce-nightly-debuginfo/7Server/x86_64 Docker CE Nightly - Debuginfo x86_64 disabled
docker-ce-nightly-source/7Server Docker CE Nightly - Sources disabled
docker-ce-stable/7Server/x86_64 Docker CE Stable - x86_64 enabled: 0
docker-ce-stable-debuginfo/7Server/x86_64 Docker CE Stable - Debuginfo x86_64 disabled
docker-ce-stable-source/7Server Docker CE Stable - Sources disabled
docker-ce-test/7Server/x86_64 Docker CE Test - x86_64 disabled
docker-ce-test-debuginfo/7Server/x86_64 Docker CE Test - Debuginfo x86_64 disabled
docker-ce-test-source/7Server Docker CE Test - Sources disabled
rhel-7-server-debug-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server (Debug RPMs) disabled
rhel-7-server-eus-optional-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support - Optional (RPMs) disabled
rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support (RPMs) disabled
rhel-7-server-eus-supplementary-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support - Supplementary (RPMs) disabled
rhel-7-server-extras-rpms/x86_64 Red Hat Enterprise Linux 7 Server - Extras (RPMs) enabled: 1,359
rhel-7-server-optional-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Optional (RPMs) enabled: 22,749
rhel-7-server-rh-common-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - RH Common (RPMs) disabled
rhel-7-server-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server (RPMs) enabled: 31,446
rhel-7-server-supplementary-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Supplementary (RPMs) enabled: 407
rhel-ha-for-rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux High Availability (for RHEL 7 Server) - Extended Update Support (RPMs) disabled
rhel-ha-for-rhel-7-server-rpms/7Server/x86_64 Red Hat Enterprise Linux High Availability (for RHEL 7 Server) (RPMs) disabled
rhel-rs-for-rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux Resilient Storage (for RHEL 7 Server) - Extended Update Support (RPMs) disabled
rhel-server-rhscl-7-rpms/7Server/x86_64 Red Hat Software Collections RPMs for Red Hat Enterprise Linux 7 Server disabled
repolist: 54,602
[root@anaconda ~]#
[Errno 14] HTTPS Error 404 - Not Found Trying other mirror.が発生しました。CentOSではなくRHELなので、”7Server”のパスが通っていないようなので修正します。
＜参照＞
Docker CE Stable - x86_64 Repo not available : HTTPS Error 404 - Not Found - https://download.docker.com/linux/centos/7Server/x86_64/stable/repodata/repomd.xml - General Discussions - Docker Forums
https://forums.docker.com/t/docker-ce-stable-x86-64-repo-not-available-https-error-404-not-found-https-download-docker-com-linux-centos-7server-x86-64-stable-repodata-repomd-xml/98965/8
コマンド
cp /etc/yum.repos.d/docker-ce.repo /etc/yum.repos.d/docker-ce.repo.org
sed -i 's/$releasever/7/g' /etc/yum.repos.d/docker-ce.repo
yum repolist all
結果
[root@anaconda ~]# yum repolist all
Loaded plugins: product-id, search-disabled-repos, subscription-manager
repo id repo name status
docker-ce-nightly/x86_64 Docker CE Nightly - x86_64 disabled
docker-ce-nightly-debuginfo/x86_64 Docker CE Nightly - Debuginfo x86_64 disabled
docker-ce-nightly-source Docker CE Nightly - Sources disabled
docker-ce-stable/x86_64 Docker CE Stable - x86_64 enabled: 108
docker-ce-stable-debuginfo/x86_64 Docker CE Stable - Debuginfo x86_64 disabled
docker-ce-stable-source Docker CE Stable - Sources disabled
docker-ce-test/x86_64 Docker CE Test - x86_64 disabled
docker-ce-test-debuginfo/x86_64 Docker CE Test - Debuginfo x86_64 disabled
docker-ce-test-source Docker CE Test - Sources disabled
rhel-7-server-debug-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server (Debug RPMs) disabled
rhel-7-server-eus-optional-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support - Optional (RPMs) disabled
rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support (RPMs) disabled
rhel-7-server-eus-supplementary-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Extended Update Support - Supplementary (RPMs) disabled
!rhel-7-server-extras-rpms/x86_64 Red Hat Enterprise Linux 7 Server - Extras (RPMs) enabled: 1,359
!rhel-7-server-optional-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Optional (RPMs) enabled: 22,749
rhel-7-server-rh-common-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - RH Common (RPMs) disabled
!rhel-7-server-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server (RPMs) enabled: 31,446
!rhel-7-server-supplementary-rpms/7Server/x86_64 Red Hat Enterprise Linux 7 Server - Supplementary (RPMs) enabled: 407
rhel-ha-for-rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux High Availability (for RHEL 7 Server) - Extended Update Support (RPMs) disabled
rhel-ha-for-rhel-7-server-rpms/7Server/x86_64 Red Hat Enterprise Linux High Availability (for RHEL 7 Server) (RPMs) disabled
rhel-rs-for-rhel-7-server-eus-rpms/7Server/x86_64 Red Hat Enterprise Linux Resilient Storage (for RHEL 7 Server) - Extended Update Support (RPMs) disabled
rhel-server-rhscl-7-rpms/7Server/x86_64 Red Hat Software Collections RPMs for Red Hat Enterprise Linux 7 Server disabled
repolist: 56,069
[root@anaconda ~]#
導入
以下のコマンドでdocker CEを導入します。
コマンド
sudo yum install docker-ce docker-ce-cli containerd.io
結果
[root@anaconda ~]# sudo yum install docker-ce docker-ce-cli containerd.io
Loaded plugins: product-id, search-disabled-repos, subscription-manager
rhel-7-server-extras-rpms | 2.0 kB 00:00:00
rhel-7-server-optional-rpms | 1.8 kB 00:00:00
rhel-7-server-rpms | 2.0 kB 00:00:00
rhel-7-server-supplementary-rpms | 2.0 kB 00:00:00
Resolving Dependencies
--> Running transaction check
---> Package containerd.io.x86_64 0:1.4.4-3.1.el7 will be installed
--> Processing Dependency: container-selinux >= 2:2.74 for package: containerd.io-1.4.4-3.1.el7.x86_64
--> Processing Dependency: libseccomp for package: containerd.io-1.4.4-3.1.el7.x86_64
---> Package docker-ce.x86_64 3:20.10.5-3.el7 will be installed
--> Processing Dependency: docker-ce-rootless-extras for package: 3:docker-ce-20.10.5-3.el7.x86_64
---> Package docker-ce-cli.x86_64 1:20.10.5-3.el7 will be installed
--> Running transaction check
---> Package container-selinux.noarch 2:2.119.2-1.911c772.el7_8 will be installed
---> Package docker-ce-rootless-extras.x86_64 0:20.10.5-3.el7 will be installed
--> Processing Dependency: fuse-overlayfs >= 0.7 for package: docker-ce-rootless-extras-20.10.5-3.el7.x86_64
--> Processing Dependency: slirp4netns >= 0.4 for package: docker-ce-rootless-extras-20.10.5-3.el7.x86_64
---> Package libseccomp.x86_64 0:2.3.1-4.el7 will be installed
--> Running transaction check
---> Package fuse-overlayfs.x86_64 0:0.7.2-6.el7_8 will be installed
--> Processing Dependency: libfuse3.so.3(FUSE_3.2)(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64
--> Processing Dependency: libfuse3.so.3(FUSE_3.0)(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64
--> Processing Dependency: libfuse3.so.3()(64bit) for package: fuse-overlayfs-0.7.2-6.el7_8.x86_64
---> Package slirp4netns.x86_64 0:0.4.3-4.el7_8 will be installed
--> Running transaction check
---> Package fuse3-libs.x86_64 0:3.6.1-4.el7 will be installed
--> Finished Dependency Resolution
Dependencies Resolved
========================================================================================================================================================================================================
Package Arch Version Repository Size
========================================================================================================================================================================================================
Installing:
containerd.io x86_64 1.4.4-3.1.el7 docker-ce-stable 33 M
docker-ce x86_64 3:20.10.5-3.el7 docker-ce-stable 27 M
docker-ce-cli x86_64 1:20.10.5-3.el7 docker-ce-stable 33 M
Installing for dependencies:
container-selinux noarch 2:2.119.2-1.911c772.el7_8 rhel-7-server-extras-rpms 40 k
docker-ce-rootless-extras x86_64 20.10.5-3.el7 docker-ce-stable 9.1 M
fuse-overlayfs x86_64 0.7.2-6.el7_8 rhel-7-server-extras-rpms 55 k
fuse3-libs x86_64 3.6.1-4.el7 rhel-7-server-extras-rpms 82 k
libseccomp x86_64 2.3.1-4.el7 rhel-7-server-rpms 56 k
slirp4netns x86_64 0.4.3-4.el7_8 rhel-7-server-extras-rpms 82 k
Transaction Summary
========================================================================================================================================================================================================
Install 3 Packages (+6 Dependent packages)
Total download size: 103 M
Installed size: 425 M
Is this ok [y/d/N]: y
Downloading packages:
(1/9): container-selinux-2.119.2-1.911c772.el7_8.noarch.rpm | 40 kB 00:00:00
warning: /var/cache/yum/x86_64/7Server/docker-ce-stable/packages/docker-ce-20.10.5-3.el7.x86_64.rpm: Header V4 RSA/SHA512 Signature, key ID 621e9f35: NOKEY ] 5.4 MB/s | 29 MB 00:00:13 ETA
Public key for docker-ce-20.10.5-3.el7.x86_64.rpm is not installed
(2/9): docker-ce-20.10.5-3.el7.x86_64.rpm | 27 MB 00:00:03
(3/9): docker-ce-cli-20.10.5-3.el7.x86_64.rpm | 33 MB 00:00:03
(4/9): fuse-overlayfs-0.7.2-6.el7_8.x86_64.rpm | 55 kB 00:00:00
(5/9): libseccomp-2.3.1-4.el7.x86_64.rpm | 56 kB 00:00:00
(6/9): slirp4netns-0.4.3-4.el7_8.x86_64.rpm | 82 kB 00:00:00
(7/9): fuse3-libs-3.6.1-4.el7.x86_64.rpm | 82 kB 00:00:00
(8/9): docker-ce-rootless-extras-20.10.5-3.el7.x86_64.rpm | 9.1 MB 00:00:02
(9/9): containerd.io-1.4.4-3.1.el7.x86_64.rpm | 33 MB 00:00:10
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total 9.5 MB/s | 103 MB 00:00:10
Retrieving key from https://download.docker.com/linux/centos/gpg
Importing GPG key 0x621E9F35:
Userid : "Docker Release (CE rpm) <docker@docker.com>"
Fingerprint: 060a 61c5 1b55 8a7f 742b 77aa c52f eb6b 621e 9f35
From : https://download.docker.com/linux/centos/gpg
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Installing : libseccomp-2.3.1-4.el7.x86_64 1/9
Installing : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 2/9
Installing : containerd.io-1.4.4-3.1.el7.x86_64 3/9
Installing : slirp4netns-0.4.3-4.el7_8.x86_64 4/9
Installing : fuse3-libs-3.6.1-4.el7.x86_64 5/9
Installing : fuse-overlayfs-0.7.2-6.el7_8.x86_64 6/9
Installing : 1:docker-ce-cli-20.10.5-3.el7.x86_64 7/9
Installing : docker-ce-rootless-extras-20.10.5-3.el7.x86_64 8/9
Installing : 3:docker-ce-20.10.5-3.el7.x86_64 9/9
Verifying : 1:docker-ce-cli-20.10.5-3.el7.x86_64 1/9
Verifying : fuse3-libs-3.6.1-4.el7.x86_64 2/9
Verifying : fuse-overlayfs-0.7.2-6.el7_8.x86_64 3/9
Verifying : slirp4netns-0.4.3-4.el7_8.x86_64 4/9
Verifying : 2:container-selinux-2.119.2-1.911c772.el7_8.noarch 5/9
Verifying : libseccomp-2.3.1-4.el7.x86_64 6/9
Verifying : 3:docker-ce-20.10.5-3.el7.x86_64 7/9
Verifying : docker-ce-rootless-extras-20.10.5-3.el7.x86_64 8/9
Verifying : containerd.io-1.4.4-3.1.el7.x86_64 9/9
rhel-7-server-extras-rpms/x86_64/productid | 2.1 kB 00:00:00
Installed:
containerd.io.x86_64 0:1.4.4-3.1.el7 docker-ce.x86_64 3:20.10.5-3.el7 docker-ce-cli.x86_64 1:20.10.5-3.el7
Dependency Installed:
container-selinux.noarch 2:2.119.2-1.911c772.el7_8 docker-ce-rootless-extras.x86_64 0:20.10.5-3.el7 fuse-overlayfs.x86_64 0:0.7.2-6.el7_8 fuse3-libs.x86_64 0:3.6.1-4.el7
libseccomp.x86_64 0:2.3.1-4.el7 slirp4netns.x86_64 0:0.4.3-4.el7_8
Complete!
[root@anaconda ~]#
Docker 起動と確認は以下で行います。
コマンド
sudo systemctl start docker
sudo systemctl status docker
結果
[root@anaconda ~]# sudo systemctl start docker
[root@anaconda ~]# sudo systemctl status docker
● docker.service - Docker Application Container Engine
Loaded: loaded (/usr/lib/systemd/system/docker.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2021-03-15 00:11:56 CDT; 17s ago
Docs: https://docs.docker.com
Main PID: 100959 (dockerd)
Tasks: 12
Memory: 45.0M
CGroup: /system.slice/docker.service
mq100959 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
Mar 15 00:11:55 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:55.083660538-05:00" level=info msg="scheme \"unix\" not registered, fallback to default scheme" module=grpc
Mar 15 00:11:55 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:55.083720390-05:00" level=info msg="ccResolverWrapper: sending update to cc: {[{unix:///run/containerd/con... module=grpc
Mar 15 00:11:55 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:55.083783691-05:00" level=info msg="ClientConn switching balancer to \"pick_first\"" module=grpc
Mar 15 00:11:55 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:55.235180629-05:00" level=info msg="Loading containers: start."
Mar 15 00:11:55 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:55.987153728-05:00" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16.... IP address"
Mar 15 00:11:56 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:56.153072279-05:00" level=info msg="Loading containers: done."
Mar 15 00:11:56 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:56.237055528-05:00" level=info msg="Docker daemon" commit=363e9a8 graphdriver(s)=overlay2 version=20.10.5
Mar 15 00:11:56 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:56.237429530-05:00" level=info msg="Daemon has completed initialization"
Mar 15 00:11:56 anaconda.icp4djp.cloud systemd[1]: Started Docker Application Container Engine.
Mar 15 00:11:56 anaconda.icp4djp.cloud dockerd[100959]: time="2021-03-15T00:11:56.340275867-05:00" level=info msg="API listen on /var/run/docker.sock"
Hint: Some lines were ellipsized, use -l to show in full.
[root@anaconda ~]#
テスト実行
hello-worldでテストを実行します。
コマンド
sudo docker run hello-world
結果
[root@anaconda ~]# sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
b8dfde127a29: Pull complete
Digest: sha256:308866a43596e83578c7dfa15e27a73011bdd402185a84c5cd7f32a88b501a24
Status: Downloaded newer image for hello-world:latest
Hello from Docker!
This message shows that your installation appears to be working correctly.
To generate this message, Docker took the following steps:
1. The Docker client contacted the Docker daemon.
2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
(amd64)
3. The Docker daemon created a new container from that image which runs the
executable that produces the output you are currently reading.
4. The Docker daemon streamed that output to the Docker client, which sent it
to your terminal.
To try something more ambitious, you can run an Ubuntu container with:
$ docker run -it ubuntu bash
Share images, automate workflows, and more with a free Docker ID:
https://hub.docker.com/
For more examples and ideas, visit:
https://docs.docker.com/get-started/
[root@anaconda ~]#
hello worldのコンテナを削除します。
コマンド
docker ps -a
docker rm <コンテナID>
結果
[root@anaconda ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0d83c3fa749c hello-world "/hello" 2 hours ago Exited (0) 2 hours ago pensive_spence
[root@anaconda ~]# docker rm 0d83c3fa749c
0d83c3fa749c
[root@anaconda ~]# docker ps -a
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
[root@anaconda ~]#
hello worldのイメージを削除します。
コマンド
docker images
docker rmi
結果
[root@anaconda ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
hello-world latest d1165f221234 9 days ago 13.3kB
[root@anaconda ~]# docker rmi d1165f221234
Untagged: hello-world:latest
Untagged: hello-world@sha256:308866a43596e83578c7dfa15e27a73011bdd402185a84c5cd7f32a88b501a24
Deleted: sha256:d1165f2212346b2bab48cb01c1e39ee8ad1be46b87873d9ca7a4e434980a7726
Deleted: sha256:f22b99068db93900abe17f7f5e09ec775c2826ecfe9db961fea68293744144bd
[root@anaconda ~]# docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
[root@anaconda ~]#
Docker をブート時に自動起動する
DockerをOSブート時に起動する場合には以下で設定が可能です。
コマンド
sudo systemctl enable docker
結果
[root@anaconda ~]# sudo systemctl enable docker
Created symlink from /etc/systemd/system/multi-user.target.wants/docker.service to /usr/lib/systemd/system/docker.service.
＜参考＞systemd で Docker の管理・設定 — Docker-docs-ja 1.11.0 ドキュメント
http://docs.docker.jp/v1.11/engine/admin/systemd.html
参考情報
なお、RHELの中にもDockerは含まれていますが古く、かつ少し新しいバージョンだったdocker-latestはRHEL7.5 から非推奨だということです。
Docker Enterprise EditionはRHELを明示的にサポートしていそうですが、2021/3月現在はDocker社からMirantis社に売却されたそうで、情報が見つけられませんでした。