How to build a slim Docker container for your Go application using multi-stage images.
I'm using Go 1.13 and the community module proxy to build t...
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Probably not for all the use cases, but you can also use the scratch container
So its even smaller than alpine 😄
And it uses and caches modules so the download command will only be executed if something changed either on
go.mod
orgo.sum
Hope it helps!
trying to remember what problems I faced with scratch image before I switched to alpine :/ Have you encountered any?
Scratch is still my go-to. Only the ssl thing handled here. That reeeeally angered me the first time when I pulled the perfectly crafted images into prod and every. call. failed.
Learned that lesson the hard way 🤷♀️
Update: I re-read this dockerfile and I like this one much more than mine. Alright if I borrow that? 😅
I think the problem I had was when I needed to do some external linking with C libs :) Then the first example wouldn't have worked either, you then need to use alpine as an initial build image too.
Scratch is great, but it DEFINITELY depends on your workload. I haven't personally built anything that couldn't run in it, but I'm positive there are limits.
Such is scratch lol
Well I think your arguments are very valid, as I said it is not for all the use cases, still we are using it in prod for heavy load micro services and stream producers/consumers and so far its going surprisingly smooth, now I feel very lucky 😂
Oh, don't get me wrong lol! My scratch-go images... Whoo! I have a single, polymorphic binary that blows my friggin socks off. It's a warehousing pipeline that can produce OR consume billions of records per day from who knows what sources. A damn tank, running on scratch.
Lol but I'd be nervous as crap deploying something that needs imagemagick via a scratch build 🤣
Nothing so far, at least not that I can remember right now. 🤔
Add
-ldflags '-s -w'
togo build
to strip DWARF, symbol table and debug info. Expect ~25% binary size decrease.golang.org/cmd/link/
I know it's an old discussion, but the multi-stage gotchas mentioned in this thread is still something you have to deal with. One of the main gotchas is that you need to know exactly what you need to copy. It gets tricky when it's more than just a single static binary. One potential alternative that takes care of this problem is DockerSlim. It creates a minified image for you using scratch and then it copies everything your application needs. Here's a Go example (no multi-stage build and it uses a standard ubuntu base image, but you still end up with a small image): github.com/docker-slim/examples/tr...
I really like multi-stages Dockerfiles for Go apps.