CODEWITHSUNDEEP
linuxdockerasp.net-core
Mathias F
Mathias F

Reputation: 15891

Using Docker for Asp.Net 5.0 Development on Linux

I can succesully install and run an ASP.Net MVC application https://github.com/aspnet/Home/tree/dev/samples/1.0.0-beta4/HelloMvc on docker using:

Dockerfile

FROM microsoft/aspnet

COPY . /app
WORKDIR /app
RUN ["dnu", "restore"]

EXPOSE 5004
ENTRYPOINT ["dnx", "." "kestrel"]

Build

docker build -t myapp .

Run

docker run -t -d -p 80:5004 myapp

The Buildstep takes 2minutes, thats why I don't want to to run all the steps when I changed some files during development. What workflow would I use when developing for a runtime that is hosted in docker? Or is docker not the right environment for development?

EDIT I copied all files of the application including the dockerfile to "/dev_app" changed to that directory and run

  $ docker run -v /dev_app:/app -d -p 80:5004 myapp

The output is the id of the container

docker ps

Does not show any entries. Is there still something missing?

EDIT 2

executing 

docker log [myid]

returns

    System.InvalidOperationException: Unable to resolve project 'app' from /app
  at Microsoft.Framework.Runtime.ApplicationHostContext..ctor (IServiceProvider serviceProvider, System.String projectDirectory, System.String packagesDirectory, System.String configuration, System.Runtime.Versioning.FrameworkName targetFramework, ICache cache, ICacheContextAccessor cacheContextAccessor, INamedCacheDependencyProvider namedCacheDependencyProvider, IAssemblyLoadContextFactory loadContextFactory, Boolean skipLockFileValidation) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.Runtime.DefaultHost.Initialize (Microsoft.Framework.Runtime.DefaultHostOptions options, IServiceProvider hostServices) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.Runtime.DefaultHost..ctor (Microsoft.Framework.Runtime.DefaultHostOptions options, IServiceProvider hostServices) [0x00000] in <filename unknown>:0 
  at Microsoft.Framework.ApplicationHost.Program.Main (System.String[] args) [0x00000] in <filename unknown>:0 
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0

Upvotes: 1

Views: 226

Answers (1)

Adrian Mouat
Adrian Mouat

Reputation: 46480

During development, put the code in a directory on host and mount that into the container, over the top of the existing code. For example, if you put a copy of the code in dev_app in your current directory:

$ docker run -v $(pwd)/dev_app:/app -d -p 80:5004 myapp

Any changes to the code in the dev_app directory will be reflected immediately in the container. When you've finished making changes, you can rebuild the container with the new version of the code for distribution.

Upvotes: 1

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