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DockerでHello,World

Last updated at Posted at 2020-01-23

#はじめに
DockerをインストールしてHello,Worldを表示させます。
OSはMacを使用します。

#Docker for Macのインストール
DockerをインストールするためにDocker Hubで無料のアカウントを作成します。アカウントを作成後した後、下記リンクからDocker for Macをダウンロード、その後インストールします。
#####・Docker for Mac

インストール後 --versionでバーションが表示されればインストール成功。

$ docker --version

#DockerでHello,World
“Hello, World” image を使用します。Dockerのテストrunに便利なイメージです。ターミナルでdocker run hello-wordを実行すると公式のDocker imageがコンテナにダウンロードされ、イメージが実行されます。

$ docker run hello-world

Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
1b930d010525: Pull complete 
Digest: sha256:9572f7cdcc2963463447a53466950bc15a2d1917ca215a2f
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/

#コンテナの情報を確認する
docker infoコマンドでDockerの情報が確認できます。

$ docker info
...
Server:
 Containers: 1
  Running: 0
  Paused: 0
  Stopped: 1
 Images: 1
...

これでDockerがインストールされ無事に起動したことが確認できました。

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