Containerization Code Diary Entries

This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job.

• Docker basics
• Docker ports shadow local ones and can cause bugs
• Dokku
• Entrypoint
• Host names differ in and outside of docker
• How docker cache works
• How to access CLI programs in a container even if not documented
• How to reduce an image size due to apt
• How to reduce layer count
• How to remember exec vs run
• Observations on buliding a dockerfile for a programming language from scratch
• Same username in another container can have different user id
• Symbolic links might not work
• Use tcp instead of unix sockets for DB containers
• You cannot modify files inside a volume with a dockerfile