Once you have static binaries you want to create the smallest possible docker container.
- automated/trusted build: so you have to put your Dockerfile into github
- a minimal docker image, so even alpine or busybox is big (compared to your binry which is probably under 1MB)
- don’t store the binary redundantly in github near to the Dockerfile
This Docker image is my proposed solution.
FROM lalyos/scratch-chmx ADD https://bintray.com/yourpackage/v1.2.3/mycli /bin/mycli RUN ["/bin/chmx", "/bin/mycli"] ENTRYPOINT ["/bin/mycli"]
The plan is to create
scratch based docker images with single static binaries.
For example i want to dockerize upx
if you install it on top of
apt-get update && apt-get install -y upx
You end up with an image over 130 MB.
You can use alpine as a base. But unfortunately there is no official upx package. With some work, you can build a static version of upx around 500KB. If you put into alpine, its again over 5MB
If you put it into
scratch, well it remains 500KB. The usual way to create
a scratch base docker images:
FROM scratch ADD upx /upx
But this way if you want an automated/trusted docker hub build, you have to put the binary into the git repo. Which shouldn’t be there.
So now the final Dockerfile should look like:
FROM scratch ADD https://bintray.com/lalyos/upx/v1.2.3/upx /upx RUN chmod +x /upx
But if you start from scratch there is no
This can be solved by adding a small tool which is
written in C and can perform a
chmod +x. Static compiled
is about: 88KB.
Of course its dockerized as:
FROM scratch ADD chmx /bin/chmx
Now you can create an upx container as: