The Modulus images are a set of Docker images designed to run arbitrary applications with a standardized external interface. The Modulus image convention enforces a high degree of security and control required by PaaS environments and might not be suitable for small, more focused, deployments.
The Modulus base image creates a mop user, under which all external software is run. The mop user does not have write access to anywhere on the Docker volume. Instead it can only write to a volume externally mounted from the host system.
/mnt
The volume mounted at /mnt requires the follow subdirectories to be created
by the host system and accessible by the mop user/group.
/mnt/tmpTemporary storage. The TEMP_DIR environment variable is defined to here./mnt/homeThe mop user's home directory. The HOME environment variable is defined to here./mnt/inputThe directory where your source will be extracted. The INPUT_DIR environment variable is defined to here./mnt/outputThe directory that will be archived as a successful build. The OUTPUT_DIR environment variable is defined to here.
The Modulus build image standard requires there to be an executable somewhere in the PATH named build. This executable should not block and should redirect any logging to stdout. The build image should read the input source from /mnt/input, perform any necessary actions, and output the compiled artifact in /mnt/output. For example, the Node.js build image performs an npm install and optionally runs the unit tests as part of its build.
The base build image is not meant to be run directly. It's designed to be inherited by an application specific image, for example the Node.js build image.
FROM: onmodulus/build-base
# Customizations
# The base image extends phusion/baseimage so it's important to run
# the init system as the CMD.
CMD ["/sbin/my_init"]
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