diamol | Code samples for the book `` Learn Docker | Continuous Deployment library
kandi X-RAY | diamol Summary
kandi X-RAY | diamol Summary
One important thing about Learn Docker in a Month of Lunches: I want it to be as accessible as possible. Too many Docker books assume that you're a Linux guru, and they give you exercises that work only on Intel machines and make sense only if you've spent years working as a sysadmin. This book is different. All the code samples and exercises are cross-platform and work on Windows, Mac, Linux, Intel, and Arm. You should be able to follow along with Windows 10 on your desktop, OSX on your MacBook, or Debian on your Raspberry Pi. I've also tried hard to assume a minimum amount of background knowledge — Docker crosses the boundaries of architecture, development, and operations, and I've tried to do the same. This book should work for you whatever your background in IT.
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QUESTION
Below is the dockerfile that creates an image:
...ANSWER
Answered 2020-Aug-25 at 12:56The diagram is correct, in that each step in the multistage build builds on top of diamol/base
.
In each step, the build.txt
file is copied across and modified. You can verify the contents of the file by running a container from the final image (e.g. foo
):
QUESTION
I'm new to Docker, sorry if my question sounds dumb. below is a dockerfile from a textbook:
...ANSWER
Answered 2020-Aug-25 at 08:31Q1-The base image is unchanged with FROM diamol/base
, you restart from the original image each time. The previous image is used by --from=build-stage
. For each step in your build, there is a layer created which can be reused to speed up later build.
Q2-Images are composed of layers, the layers are reused between images. There is maybe a bit of overhead but the space is not duplicated. Images are immutable, the container based on the image contains the changes.
A Docker image is built up from a series of layers. Each layer represents an instruction in the image’s Dockerfile. Each layer except the very last one is read-only.
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