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Docker を Mac に Homebrew を使って簡単にインストールする手順

Docker を Mac に Homebrew を使ってインストールするコマンドまとめ

# インストール
brew cask install docker
# ↓不要
#brew install docker-compose

# 起動(メニューバーの Docker アイコンが落ち着いたら次の工程へ)
open /Applications/Docker.app/

# インストール確認
docker --version
docker-compose --version

# 動作確認
docker run hello-world
cat <<EOF > docker-compose.yml
version: '3'
services:
  hello:
    image: hello-world
EOF
docker-compose up
docker-compose down

実際に作業した記録

$ # インストール
$ brew cask install docker
==&gt; Satisfying dependencies
==&gt; Downloading https://download.docker.com/mac/stable/26399/Docker.dmg
######################################################################## 100.0%
==&gt; Verifying checksum for Cask docker
==&gt; Installing Cask docker
==&gt; Moving App 'Docker.app' to '/Applications/Docker.app'.
?  docker was successfully installed!
$
$
$
$ brew install docker-compose
==&gt; Installing dependencies for docker-compose: docker
==&gt; Installing docker-compose dependency: docker
==&gt; Downloading https://homebrew.bintray.com/bottles/docker-18.06.0.sierra.bottle.tar.gz
Already downloaded: /Users/oki2a24/Library/Caches/Homebrew/docker-18.06.0.sierra.bottle.tar.gz
==&gt; Pouring docker-18.06.0.sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/docker
Target /usr/local/bin/docker
already exists. You may want to remove it:
  rm '/usr/local/bin/docker'

To force the link and overwrite all conflicting files:
  brew link --overwrite docker

To list all files that would be deleted:
  brew link --overwrite --dry-run docker

Possible conflicting files are:
/usr/local/bin/docker -&gt; /Applications/Docker.app/Contents/Resources/bin/docker
==&gt; Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==&gt; Summary
?  /usr/local/Cellar/docker/18.06.0: 8 files, 52.3MB
==&gt; Installing docker-compose
==&gt; Downloading https://homebrew.bintray.com/bottles/docker-compose-1.22.0.sierra.bottle.tar.gz
Already downloaded: /Users/oki2a24/Library/Caches/Homebrew/docker-compose-1.22.0.sierra.bottle.tar.gz
==&gt; Pouring docker-compose-1.22.0.sierra.bottle.tar.gz
Error: The `brew link` step did not complete successfully
The formula built, but is not symlinked into /usr/local
Could not symlink bin/docker-compose
Target /usr/local/bin/docker-compose
already exists. You may want to remove it:
  rm '/usr/local/bin/docker-compose'

To force the link and overwrite all conflicting files:
  brew link --overwrite docker-compose

To list all files that would be deleted:
  brew link --overwrite --dry-run docker-compose

Possible conflicting files are:
/usr/local/bin/docker-compose -&gt; /Applications/Docker.app/Contents/Resources/bin/docker-compose
==&gt; Caveats
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==&gt; Summary
?  /usr/local/Cellar/docker-compose/1.22.0: 886 files, 9.4MB
==&gt; Caveats
==&gt; docker
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
==&gt; docker-compose
Bash completion has been installed to:
  /usr/local/etc/bash_completion.d

zsh completions have been installed to:
  /usr/local/share/zsh/site-functions
$
$
$
$ # 起動(メニューバーの Docker アイコンが落ち着いたら次の工程へ)
$ open /Applications/Docker.app/
$
$
$
$ # インストール確認
$ docker --version
Docker version 18.06.0-ce, build 0ffa825
$ docker-compose --version
docker-compose version 1.22.0, build f46880f
$
$
$
$ # 動作確認
$ 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 &quot;hello-world&quot; 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/

$
$
$
$ cat &lt;&lt;EOF &gt; docker-compose.yml
> version: '3'
> services:
>   hello:
>     image: hello-world
> EOF
$ docker-compose up
Creating network &quot;oki2a24_default&quot; with the default driver
Creating oki2a24_hello_1 ... done
Attaching to oki2a24_hello_1
hello_1  | 
hello_1  | Hello from Docker!
hello_1  | This message shows that your installation appears to be working correctly.
hello_1  | 
hello_1  | To generate this message, Docker took the following steps:
hello_1  |  1. The Docker client contacted the Docker daemon.
hello_1  |  2. The Docker daemon pulled the &quot;hello-world&quot; image from the Docker Hub.
hello_1  |     (amd64)
hello_1  |  3. The Docker daemon created a new container from that image which runs the
hello_1  |     executable that produces the output you are currently reading.
hello_1  |  4. The Docker daemon streamed that output to the Docker client, which sent it
hello_1  |     to your terminal.
hello_1  | 
hello_1  | To try something more ambitious, you can run an Ubuntu container with:
hello_1  |  $ docker run -it ubuntu bash
hello_1  | 
hello_1  | Share images, automate workflows, and more with a free Docker ID:
hello_1  |  https://hub.docker.com/
hello_1  | 
hello_1  | For more examples and ideas, visit:
hello_1  |  https://docs.docker.com/engine/userguide/
hello_1  | 
oki2a24_hello_1 exited with code 0
$
$ docker-compose down
Removing oki2a24_hello_1 ... done
Removing network oki2a24_default
$

おわりに

brew install docker-compose で docker もインストールされます。ですので、これだけで良いのではないかと思ったのですけれども、brew cask docker をしなければ動きませんでした＞＜。

cask の方は、Docker.app がインストールされます。これを実行しなければ、docker が使えませんでした。

cask で無い方の docker を、起動する方法がわかれば、cask の Docker をインストールしなくても良いのでしょうか？

気になりますけれども、今回の手順で動きましたので、これでよしといたします。

次のページを見ますと、cask の docker のみで大丈夫のようですけれども、、、よくわかりません。

追記(2018年7月28日12時42分)

cask で無い方の docker、docker-compose のインストールは不要でした。cask でのインストーしても動かないと思っていたのは、おそらくインストール後に Docker を起動していなかったからです＞＜。

以上です。

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