Change parent image to openjdk:8-jdk-alpine?

[alicefr]

Hi,
I have a question and I hope you could help me.

I wanted to build openzipkin/zipkin docker image for another platform rather than x86. However, the cantara/alpine-zulu-jdk8 has not multi-arch image support. So, I was wondering if it would be possible to change the parent image of openzipkin/jre-full: with the official docker image openjdk:8-jdk-alpine. The openjdk images has already multi-arch support.

Thanks for the help!

[codefromthecrypt]

Thanks for the idea, Alice. I think the main issue is about the image size.. maybe with the current squashing approach we can handle that? Also, are you available to help with this?

[alicefr]

hi @adriancole. What are you concerns about the image size?The openjdk image size?
Because on my system (x86_64) the openjdk is smaller than cantara based image

$ docker pull cantara/alpine-zulu-jdk8
$ docker images | grep cantara
cantara/alpine-zulu-jdk8        latest                                     82d6c0ad442e        5 weeks ago         163MB

$ docker pull openjdk:8-jdk-alpine
$ docker images | grep openjdk
openjdk                         8-jdk-alpine                               224765a6bdbe        4 months ago        102MB

I'm glad to help you with that!

I saw that you use docker-squash command. Are you aware of the squash flag for docker build.
It is still an experimental flag, but it may help

[codefromthecrypt]

We get a lot of grief, often but not always from go folks, about the size of our image. Also there are devs who work in low bandwidth scenarios and having a small base layer helps a lot. Notably, this repo rips out the "JDK" part leaving only the runtime. so if you look at this image it would be smaller.. if it is even smaller after switch to openjdk that's be great. PS I am not fresh on docker build goodies, so didn't know about that experimental flag

[alicefr]

I will try to substitute the parent image and look at the size. If it is equal or smaller I can open a little PR with the changes. Is that ok for you?

[codefromthecrypt]

I await in anticipation, Alice!

[alicefr]

hi @adriancole! You find here my PR #8

[codefromthecrypt]

all good. thanks @alicefr!

Next up would be considering JRE 9 :)

[codefromthecrypt]

images are recut zipkin 2.7.4 is based on this