{"id":4840,"date":"2026-07-22T21:55:55","date_gmt":"2026-07-22T16:25:55","guid":{"rendered":"https:\/\/itsupportwale.com\/blog\/10-docker-best-practices-to-build-faster-secure-images\/"},"modified":"2026-07-22T21:55:55","modified_gmt":"2026-07-22T16:25:55","slug":"10-docker-best-practices-to-build-faster-secure-images","status":"publish","type":"post","link":"https:\/\/itsupportwale.com\/blog\/10-docker-best-practices-to-build-faster-secure-images\/","title":{"rendered":"10 Docker Best Practices to Build Faster, Secure Images"},"content":{"rendered":"

POST-MORTEM REPORT: INCIDENT #8842-B (REGISTRY OOM-KILL)<\/strong>
\nDATE:<\/strong> 03:14 AM
\nAUTHOR:<\/strong> Senior Systems Architect (Infrastructure\/Core)
\nSTATUS:<\/strong> Severely Caffeinated \/ Highly Irritated
\nSUBJECT:<\/strong> THE MANIFESTO OF EFFICIENCY: WHY YOUR 4GB IMAGE IS A CRIME AGAINST ENGINEERING<\/p>\n

It is 3:00 AM. My pager didn’t just beep; it screamed because our private registry\u2019s storage volume hit 100% capacity and the garbage collector choked to death trying to process a single push. I looked at the logs. I saw the culprit. A “microservice”\u2014and I use that term with the same irony one might use to describe a lead-lined coffin\u2014that clocked in at 4.2GB. <\/p>\n

Four. Gigabytes. For a Node.js API that returns a JSON object.<\/p>\n

I\u2019ve spent the last hour purging the registry and manually cleaning up the overlay2 directories on the build nodes. To ensure I never have to do this again, I am pinning this manifesto. If you push an image over 200MB without a written justification signed in blood, I am revoking your sudo access and moving your desk to the basement.<\/p>\n

Here is the “masterpiece” I found in the repository. Look at it. Study its failure.<\/p>\n

# THE CRIME SCENE\nFROM ubuntu:latest\nRUN apt-get update\nRUN apt-get install -y nodejs npm python3 build-essential git\nCOPY . \/app\nWORKDIR \/app\nRUN npm install\nENV API_KEY="secret_key_that_is_now_in_git_history"\nRUN rm -rf \/var\/lib\/apt\/lists\/*\nEXPOSE 3000\nCMD ["npm", "start"]\n<\/code><\/pre>\n
This isn’t a container; it’s a virtual machine with an identity crisis. Let\u2019s dissect why this is an objective failure of professional standards.<\/p>\n
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Table of Contents<\/p>\n