image build time doubled after image size optimizations about microservices-demo

[orthros]

I've been taking a look at this, and the biggest time sink is actually pip install grpcio grpcio-tools.

On my local machine this can take upwards of 8 minutes on alpine. I'm currently in the process of submitting some PRs to the gRPC team that will give slim and alpine images for python, which we can then use as the base for loadgenerator and emailservice

[orthros]

I've opened PRs with the gRPC docker images repository to better fill out their options

• New library for grpcio 1.12.1
• Alpine for existing libraries
• Python-slim based images

[orthros]

Opened additional PRs with the gRPC docker images repository in the event we want to upgrade gRPC versions

• Added Python 1.14.* images
• Added Python 1.15.0 images

[ahmetb]

We probably wanna update to 1.15.x at some point, the only issue is that v1.15 introduces a new rpc to the health "interface", and we don't implement that method which leads to compilation error in Go services.

[ahmetb]

Python services can update to 1.15 right away I think.

[orthros]

Okay. If/when my PRs are merged I'll retool our python services to update to 1.15 and update images appropriately.

[ahmetb]

#120 solved this by moving back to glibc based images for Python services and cleaning up requirements.txt files.