After docker released native support for multi-stage builds , I decided to make my own small docker container with app. Below container is based on the one from @bitwalker . It is the smallest one I could come up with in one sitting, given quite limited knowledge of docker & distillery releases: # D…

So either your app was extremely small or didn’t depend on much - in any case, I suspect most real-world applications will be much larger than 18mb. ERTS itself is only like 6mb, and anything in priv of your application or your dependencies will also be included. Yes, it didn’t have many depen…

I’ve measured the space taken inside the container, and here’s what I’ve got. here’s the root: docker run -it gmile/ritm:0.0.9 du / -h -d 1 0 /dev 4.0K /home 0 /proc 4.0K /root 8.9M /usr 4.0K /tmp 812.0K /bin 80.0K /var 0 /sys 1.3M /etc 4.0K /run 4.0K /s…

Upgrading the base image to bitwalker/alpine-elixir:1.4.5 (with erlang 20.0.1 underneath ) shaved off another 12 Mb down to 48 Mb . After looking at the size stats, the shrink is due to erts loosing some weight: docker run -it gmile/ritm:0.0.10 du /app -h -d 1 21.1M /app/erts-9.0.1 52.0K /app/bin…

You’d have to show what is taking up that space in the ERTS folder - on my laptop, a release packed with ERTS included only shows 5.4mb in the erts-9.0 folder via du -hs <path>. Either there is more in the ERTS folder on Alpine which can be stripped (and I can tweak that in the Alpine images I produ…

Here’s what I’ve got: docker run -it gmile/ritm:0.0.10 du /app/erts-9.0.1 -h -d 1 19.3M /app/erts-9.0.1/bin 872.0K /app/erts-9.0.1/include 4.0K /app/erts-9.0.1/doc 852.0K /app/erts-9.0.1/lib 12.0K /app/erts-9.0.1/src 4.0K /app/erts-9.0.1/man 21.1M /app/erts-9.0.1 Looking closer, look…

Interesting, so maybe on Alpine it’s statically linked? I’ll have to review how I’m compiling Erlang in the base image, maybe I have some options set that aren’t needed.

[image] gmile: It’s around 64Mb when pushed to docker hub. That’s a lot If that’s a lot to you :sweat_smile: Most images I usually deploy are +500MB… (not my fault, but many people tend to just take Ubuntu as a base image and add a lot of unneeded crap to it…) Congrats for trying out multi-…

My own alpine image built through edib with a bit of tweaking are around 23 to 40 MB depending on js and assets most of the time. With few assets, 23 MB is a classic.

~20 MB will be the lower boundary I think (without stripping or zipping the source code; empty hello world project). But I also think this is okay enough and mostly better than 500MB to 1GB sized images I currently see floating around in Docker based setups of some companies.

[image] bitwalker: Interesting, so maybe on Alpine it’s statically linked? If I understand correctly, there are at least some libs that erts is linked dynamically against: docker run -it gmile/ritm:0.0.10 ldd /app/erts-9.0.1/bin/beam.smp /lib/ld-musl-x86_64.so.1 (0x5556a11bd000) …

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Smallest docker container with elixir app

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gmile July 19, 2017, 8:49pm 18

I didn’t know about edib, thank you!