August 2016
Intermediate to advanced
384 pages
9h 20m
Japanese
Content preview from Docker
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25
3.3 Dockerle からのイメージの構築
3.3
Dockerfile
からのイメージの構築
Dockerfile
は、
Docker
のイメージを生成するための一連の手順を含む、単なるテキストファイ
ルです。まず、サンプルのための新しいフォルダとファイルを作成しましょう。
$ mkdir cowsay
$ cd cowsay
$ touch Dockerfile
そして、以下の内容を
Dockerfile
に書き込んでください。
FROM debian:wheezy
RUN apt-get update && apt-get install -y cowsay fortune
FROM
命令は、使用するベースイメージを指定しています（先ほどと同様に
debian
ですが、今回
は
"wheezy"
というタグのバージョンを使うよう指定しています）。
Dockerfile
の、コメントを除
く最初の命令は、必ず
FROM
でなければなりません。
RUN
コマンドは、イメージ内で実行するシェ
ルのコマンドを指定します。ここで行っているのは、先ほどと同じく
cowsay
と
fortune
のインス
トールだけです。
これで、同じディレクトリから
docker build
コマンドを実行すれば、イメージを構築できます。
$ ls
Dockerfile
$ docker build -t test/cowsay-dockerfile .
Sending build context to Docker daemon 2.048 kB
Step 0 : FROM ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.