Person/Zack Steinkamp/Blog/21/05/The Best Ways To Run a Short Script in a Container

• The Best Ways To Run a Short Script in a Container

  • My Notes

    • Person/Zack Steinkamp describes two ways to run script/CLI-style tasks from the shell via Docker without maintaining a separate Dockerfile and compose/runner script for each task.
    • containerscript: Single Bash script that inlines the Dockerfile, build/run commands, and the script to run (see Gist).
    • Turdokken: Shebang-line tool; install in $PATH and use as shebang so scripts declare dependencies (e.g. --install mysql-client) and run in a container. Repo: GitHub/zsteinkamp/turdokken.

  • dockerscript

    • One Bash script defines the Dockerfile, Docker build/run commands, and the script to run. Replace the cmd() function and adjust the FROM line or RUN commands for dependencies.
    • Example GitHub/Gist
      • dockerscript - A single bash script that bootstraps a container, then runs itself inside that container. Use any "FROM" line. The only requirement is that /bin/bash is present. See also [Turdokken](https://github.com/zsteinkamp/turdokken).

  • GitHub/zsteinkamp/turdokken

    • If one uses turdokken as the shebang, then scripts run in a container with declared dependencies.
    • Install Turdokken in $PATH; shebang must be #!/usr/bin/env -S turdokken.
    • Example script:

      • #!/usr/bin/env -S turdokken --install mysql-client
        
        mysql --version
        uname -a
        echo $HOST_USERNAME
        echo $@

    • Running ./myscript.sh foo bar runs the script inside a container that has mysql-client installed; Turdokken builds the image, runs the container, mounts the script, and invokes it with bash. You can mount local files for reading or modification.