mwaeckerlin / scratch

Docker image from scratch with some basic definitions.

Docker Scratch Image with Definitions and Non Root User

Docker image from scratch with some basic definitions:

• a non root user to run your services
• a non root user to build your services
• some variables to be used
• a nice command line prompt

Image size: ca. 2.06kB (may change)

Compile Time Arguments

• lang to set language, defaults to en_US.UTF-8

Environment Arguments

The environment variables are intended to be used in derieved images. They are not intended to be changed. Just use them instread of hard coding in your images.

User Variables

Use these variables for user name, group and home:

• RUN_USER: set to somebody
• RUN_GROUP: set to somebody
• RUN_HOME: set to /home/somebody

If you need to share data on volumes between containers, and if you therefore must have a predefined group id, then use the following:

• SHARED_GROUP_NAME: set to shared-access
• SHARED_GROUP_ID: set to 500

Build Variables

Use these variables in RUN commands in your docker file. E.g. install package gcc (the GNU Compiler Collection) using: RUN $PKG_INSTALL gcc, or give the run user access to path /target: RUN $ALLOW_USER /target

• PKG_INSTALL: set to apk add --no-cache --clean-protected -u
• PKG_REMOVE: set to apk del --no-cache --purge
• PKG_SEARCH: set to apk search --no-cache
• PKG_CLEANUP1: set to apk del --no-cache busybox alpine-baselayout
• PKG_CLEANUP2: set to apk del --no-cache --purge apk-tools zlib alpine-keys
• ALLOW_USER: give access to a path to $RUN_USER, set to chown -R ${RUN_USER}:${RUN_GROUP}
• ALLOW_BUILD: give access to a path to $BUILD_USER, set to chown -R ${BUILD_USER}:${BUILD_GROUP}

See mwaeckerlin/nodejs-build for an example of a build image.

Use these variables for user name, group and home at build time, use $RUN_USER at run time:

• BUILD_USER: set to coder
• BUILD_GROUP: set to coder
• BUILD_HOME: set to /home/coder

Internally used system variables:

• LANG: set to build argument ${lang}, normally set to en_US.UTF-8
• PS1: set to a nice console prompt