Memo/Docker/Dockerfile

Dockerfile
- 変数の条件分岐
- Dockerfileを直接実行する

Dockerfile †

Dockerfile リファレンス — Docker-docs-ja 17.06.Beta ドキュメント

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↑

変数の条件分岐 †

環境によって分岐したい時がある
OK: RUN でVAR="..." && cmd1 && ... のようにすると参照できる
NG: "RUN export VAR1=..."のようにしても、別のRUNからは参照できない。
NG: "ENV VAR1 (...)" では変数展開されず、文字列そのままになる。

例: nodejsのdownloadはx64, arm64。x86_64を指定した時にx64のリンクからダウンロードしたい

Dockerfile

# x86_64, arm64
ARG TARGET_ARCH="x86_64"
ARG NODEJS_VERSION="v23.8.0"

RUN NODEJS_ARCH=$( \
      case ${TARGET_ARCH} in \
        x86_64 ) echo "x64";; \
        * ) echo "${TARGET_ARCH}";; \
      esac \
    ) \
    && wget https://nodejs.org/dist/latest/node-${NODEJS_VERSION}-linux-${NODEJS_ARCH}.tar.gz

↑

Dockerfileを直接実行する †

"chmod +x Dockerfile" で直接実行可能にするアイデア
#!/usr/bin/env docker run · GitHub

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Memo/Docker/Dockerfile

Dockerfile †

変数の条件分岐 †

Dockerfileを直接実行する †

Software

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