Using Docker Multi-Stage Builds 

I don't usually subscribe after one video, but this was straight to the point, with real life example which is very useful.

Thank you Viktor, always great to refresh on the fundamentals. I've had to explain multistage builds to developers recently, your vid would have been of great help, bookmarked for later :)

Thanks Viktor, for a good reminder on Docker. Always great videos.

What a brilliant tutorial! You are a great man sir. Keep up the good work.

Sweet ,simple and to the point video. Subscribed!

Such a great explanation and so to the point. Thanks a lot.

Great and simple explanation, what else could you ask for.

This was great thank you for the thorough explanation!

Great video as usual. Thanks Viktor

Checking RU-vid and found this video. By far one of the best videos I found around the topic multi-stage docker builds. @DevOpsToolkit thank you for keeping it simple and straight.

I m watching from Turkey. Thank you boss

Absolute gold this video is.

Excellent video. Thanks for sharing.

Amazing content! I have learned a lot with your videos

Amazing video. Thank you for sharing

Excellent explanation, thank you

Great video! Thanks!

Excellent explanation thank you a lot Sir!

Thank Viktor. I use multi-stage builds for long time. A video in the future about kubernetes operators (maybe vs helm) will be great.

amazing minimal illustration

Thanks for sharing

Really good video, and channel in general. I wish I have found it earlier.

Great example.

I use multi-stage builds in a similar way for my Python apps. I like to use python:3-buster (~850MB) as the build image and then python:3-slim-buster (~115MB) as the final image. This allows things (e.g. cffi) to compile during the build w/o the bloat needed in the run.

Спасибо что делишься своими знаниями!

We use multi-stage builds on Golang projects and for compiling JavaScript static content. But sometimes come node js developers with dependencies up to 1Gb that needed in runtime.

Thanks!

Thanks

Great video as always. Is there a way you can catch the Unit Test error and feedback to your CI system, where you can clearly tell the user the Unit Test failed? As not all developers are willing to dive into the Jenkins (or other CI tools) and look into the logs, would be nice if there's a way to clearly identify it as a "unit test" error.

Great video Viktor 👍 could you please make video on kubernete operators.

I've been testing for the past couple hours and kept running into the issue where alpine would not execute the go binary that was created. The solution was to use **FROM debian** instead of *FROM alpine*. Just a heads up for anyone else that runs into this problem. "This is because golang is not alpine base but debian base."

Hi Viktor, multi-stage builds are an awesome feature! However, I struggle when it comes to import unit tests / code coverage results, into the CI/CD tool. Generally, an XML JUnit file is generated when tests are executed, and this file can be uploaded using a built-in task from the CI/CD tool. However, this task cannot be used from the Dockerfile, so currently, the only workaround I found is to run the tests independently in the pipeline and import results outside the Dockerfile. Another way could be to copy the report file from the container to the agent running the pipeline, but as we use multi-stage builds, the stage where tests are executed is deleted once the final image is built. Do you have any suggestion to solve this kind of problem?

Thank you, very useful video! For languages that require runtime like Java would you have any suggestions on how to best split the the image build? Is there something better we can do other than building on an image with jdk and running on image with jre?

Thank you for the video. When using multi-stage build we don't rely on application artifacts and artifacts registry (jar and nexus). Is it a good solution to have only docker images as "artifacts"?

Thanks for the wonderful explanation. I have one question; there are multiple docker image optimization techniques and one of them is using multi-stage build. Can you suggest why should anyone use any other technique (choosing minimal base image, minimize layer size and count, cache image layers, etc) when they are using multistage which eventually reduce image size and layers ?

Can we use multiple base images in one image?

Spending time with multi-stage dockerfiles sure can be fun, but I think it can be really tedious and really error prone work, especially if you have to deal with project where multiple programming languages are involved. Instead of guessing which base image to use, and what steps to choose, you already are spending precious hours just to get stuff nearly up and running. This is why I like the idea behind Cloud Native Buildpacks project. What do you think about it Viktor? BR, -Admir

Are you using multi-stage builds or you prefer building, testing, etc. outside Dockerfile?

Ah so the Dockerfile is almost like a Makefile in a sense

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too bad you didn't mention that the --target flag, you can define dozens of images in the dockerfile with arbitrary requirement chains yet build a single image and only its requisite stages. lazy evaluation for the win

Why on an earth you'll need to do this with docker?