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CentOS7.5に最新バージョンのDockerをインストールする

Last updated at Posted at 2018-08-31

#はじめに
公式ドキュメントを参考し、CentOSに最新バージョンのDockerをインストールしました。
メモとしてインストール手順を残しておきます。

#環境

  • CentOS:7.5.18.04
  • Docker:18.06.1-ce
  • ネットワーク:プロキシーなし

#手順

古いバージョンのものをアンインストールします

sudo yum remove docker  docker-client  docker-client-latest  docker-common  docker-latest  docker-latest-logrotate  docker-logrotate  docker-selinux  docker-engine-selinux  docker-engine

必要なパッケージをインストールします

sudo yum install -y yum-utils device-mapper-persistent-data lvm2

リポジトリを追加します

sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

Docker CEをインストールします

sudo yum install docker-ce -y 

自動起動を有効化します

sudo systemctl enable docker

Dockerを起動します

sudo systemctl start docker

インストールしたDockerをバージョン確認します

[user@localhost ~]$ docker -v
Docker version 18.06.1-ce, build e68fc7a

hello-worldを実行します

[user@localhost ~]$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
9db2ca6ccae0: Pull complete
Digest: sha256:4b8ff392a12ed9ea17784bd3c9a8b1fa3299cac44aca35a85c90c5e3c7afacdc
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/engine/userguide/

##sudoなしでDockerを実行するため、ユーザーをDockerグループに追加します
セキュリティが弱くなります

sudo usermod -aG docker $USER

実行後、再ログインすると、sudoなしでdockerコマンドを実行できるになります。

#参考資料

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