Reduce Container Size

[razo7]

Drastically minimize container size (~1GB -> ~210MB):

1. Cleaning temporary files after installing external packages - by usingclean all (see it also from container best practices-> Clean temporary files)
2. Build the container in a multi-stage manner to exclude unneeded packages Golang, source files and .git from the final image.

[slintes]

what about using a multi stage container build, so the resulting image doesn't contain Go, source files and .git?

[razo7]

what about using a multi stage container build, so the resulting image doesn't contain Go, source files and .git?

That's definitely something I am keen of doing for not only removing the above redundant stuff, but to decrease the enormous size of the image (around 1 GB prior to this PR cleaning).

I haven't done it until now, since I have a problem of using a smaller base image and still be able to find and download the fence-agents-all package. But thinking again about it I think we can still add another base image for the purpose you have mentioned and deal with the fence-agents-all package problem afterwards (in a different PR).

What is the problem? In short I wanted to use UBI base image (or it's variants, such as ubi-minimal ), after building the FAR binary and with UBI try to install fence-agents-all package. Since this package is part of HighAvailability add-on repo, then we need to enable it in UBI so it could find the desired package. Enabling is easy, but having/adding this repo is the problem.

[slintes]

I haven't done it until now, since I have a problem of using a smaller base image

you can use the same image in both build steps. The final one will just not contain Go and sources / .git. I assume that will save a lot of space already with very low effort. You can look for a smaller base image later.

[razo7]

The final one will just not contain Go and sources / .git. I assume that will save a lot of space already with very low effort.

You are right, it did save ~640 MB, and the resulting image is ~210 MB. Still not as minimal as other Medik8s operators, but in a much better place than around 1 GB prior to this PR.

[openshift-ci]

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