[Question] Build docker images

Guys, one question, how you built the images before pushing them on Docker registry? just build the solution on release mode, tag and push the image?

I have a doubt how to tell docker that takes the aspnetcore image instead of aspnetcore-build

Thanks in advance.

[eiximenis]

Hi @vany0114 On a multi-stage Dockerfile only one image persists and its generated as a output of the Dockerfile: the one declared in the latest FROM.

As you can see in our Dockerfiles the latest FROM always is FROM base as XXX and base image is the one created from microsoft/aspnetcore:2.0.5. But of course, this is up to you 😃

[CESARDELATORRE]

Yeah, you can do so for dev/test environments, directly from your PC. But in a real project, that should be done by your CI/CD pipelines like when using VSTS, like we have for eShopOnContainers, so the push to Docker Hub is performed by the CI pipeline. About the base image, take into account that we’re using Docker Multi-Stage build, so the base image for most of our containers is always microsoft/aspnetcore , not aspnetcore-build which is only used by Docker when compiling the .NET project and when building the Docker image with the Docker Multi-Stage Build dockerfiles. This is one example of one of our dockerfiles using Docker Multi-Stage Build: https://github.com/dotnet-architecture/eShopOnContainers/blob/dev/src/Services/Catalog/Catalog.API/Dockerfile

For more info on Docker Multi-Stage Build, see: https://docs.microsoft.com/en-us/dotnet/core/docker/building-net-docker-images https://docs.docker.com/develop/develop-images/multistage-build/

Docker Multi-Stage Build is new for .NET Core images since late 2017, btw.