notes.md

Notes

Why apt-get instead of apt?

• apt is meant for terminal.
• For script installation, apt-get is recommended.
• Ref: Askubuntu & apt(8) manpage

Why --no-install-recommends in apt?

• To avoid installing unnecessary pkgs and thereby, reduce image build time.
• Reduces build image size by ~260MB.

Why default-jdk-headless instead of default-jdk?

• To avoid installing unnecessary GUI dependencies by latter and thereby, reduce image build time.
• The former is ~140MB smaller than latter.

Why install libfl-dev?

• --no-install-recommends skips it.
• flex needs it.
• Otherwise, throws error /usr/bin/ld: cannot find -ll during make in scl.

Why remove /var/lib/apt/lists/* files?

• To reduce image size.
• Done by official Dockerfiles:
  • Dockerfile for Go
  • Dockerfile for Python

Why remove git folders?

To reduce image size (scl git folder size is 250M)

Why separate build & run deps?

To reduce final image size, thereby, reduce image pull time.

Build deps bash bison camlp4 default-jdk-headless flex libfl-dev g++ gcc git make ocaml ocamlbuild

Runtime deps apache2 bash default-jre-headless graphviz lttoolbox perl python3

Unsure (considering as runtime deps for now) python3-pip python3-pandas python3-openpyxl xsltproc anytree