All Questions
1,535
questions
136
votes
5
answers
83k
views
Why does aspnet core start on port 80 from within Docker?
TL;DR: Why does an aspnet core app run on port 80 from within a Docker image, but 5000 outside a docker image.
Elaborate
I went through the aspnet core / docker tutorial found here:
https://learn....
- 5,334
97
votes
9
answers
22k
views
The author primary signature's timestamp found a chain building issue: UntrustedRoot: self signed certificate in certificate chain
While doing a docker build on my .NET Core project, I got the following error on all my NuGets:
80.19 /app/GradingTool.Tests/GradingTool.Tests.csproj : error NU3028: Package 'Microsoft....
- 1,405
68
votes
11
answers
82k
views
Error: It was not possible to find any installed .NET Core SDKs
When I run the command docker run -i -t myProject it shows error:
It was not possible to find any installed .NET Core SDKs
Did you mean to run .NET Core SDK commands? Install a .NET Core SDK ...
- 681
63
votes
1
answer
10k
views
Dotnet Core Docker Container Leaks RAM on Linux and causes OOM
I am running Dotnet Core 2.2 in a Linux container in Docker.
I've tried many different configuration/environment options - but I keep coming back to the same problem of running out of memory ('docker ...
- 631
60
votes
12
answers
56k
views
Getting "Program does not contain a static 'Main' method suitable for an entry point" when building using docker, why?
I'm running into an issue using Docker and couldn't find a proper solution.
I'm trying to build a Docker image using .NET SDK 2.1.
The thing is that when Docker tries to run the build statement, it ...
- 651
58
votes
9
answers
52k
views
ASPNETCORE_ENVIRONMENT in Docker
i have problems setting the ASPNETCORE_ENVIRONMENT variable running my project in a docker container. The problem is that the value is always set/overwritten to "Development".
I have tried ...
- 619
47
votes
7
answers
26k
views
Performing a health check in .NET Core Worker Service
How can I implement health checks in a .NET Core Worker Service?
The service will be run inside Docker and needs to be able to check the health of the service.
- 688
45
votes
15
answers
57k
views
A fatal error was encountered. The library 'libhostpolicy.so' required
I am running dotnet core 2.0 console project.
Ran into the following error when trying to run it from Docker.
A fatal error was encountered. The library 'libhostpolicy.so' required
to execute ...
- 1,659
43
votes
4
answers
50k
views
Docker Compose - adding identifier to network name
I trying to create network in docker-compose.vs.debug.yml file:
networks:
myNetwork:
driver: bridge
But docker adding some identifier:
docker network ls ->
NETWORK ID NAME ...
- 547
42
votes
1
answer
2k
views
Docker compose with .NET Core, SQL Server, Elasticsearch, and cerebro services
I'm trying to run a number of services using a docker-compose file.
First of all let's say that Docker, version 20.10.3, is running on a Red Hat Enterprise Linux release 8.3.
This is the docker-...
- 571
41
votes
5
answers
13k
views
Docker build complains it can't find nuget fallback package folder
I'm following the tutorial at https://learn.microsoft.com/en-us/dotnet/core/docker/docker-basics-dotnet-core#dockerize-the-net-core-application in learning to containerise .net core applications into ...
- 18.9k
36
votes
9
answers
26k
views
docker container exits immediately even with Console.ReadLine() in a .NET Core console application
I am trying to run a .NET Core 1.0.0 console application inside a docker container.
When I run dotnet run command from inside the Demo folder on my machine, it works fine; but when run using docker ...
- 613
36
votes
1
answer
31k
views
appsettings.json vs appsettings.{Environment}.json in .NET Core apps
I am new in .NET Core and as far as I see from my search on the web, appsettings.Development.json is used for development config while developing the app and appsettings.Production.json is used on the ...
user15294968
31
votes
8
answers
31k
views
How to connect ASP.Net Core to a SQL Server Docker container on Mac
I am developing an ASP.Net core MVC application using Visual Studio 2017 on Mac. However, I am facing some problems to connect to an instance of SQL Server that is running on a Docker container.
...
- 2,836
29
votes
1
answer
43k
views
Merging appsettings with environment variables in .NET Core
I am running a .NET Core app in Docker (in Kubernetes), passing environment variables to the Docker container and using them in my app.
In my .NET Core app I have the following C# class:
public ...
- 8,430
29
votes
2
answers
24k
views
System.Net.Http.HttpRequestException: Cannot assign requested address - error while communicating between 2 .net core web apps in localhost
I'm new to docker and I have a visual studio solution with 2 dotnet core projects - UI and API. I've added docker support for both projects and they worked normally anytime I debug. Now they have an ...
- 875
29
votes
3
answers
30k
views
Parameters in .NET Core docker launchSettings.json
I am writing an ASP.NET Core application and I have a launchSettings.json file with the following content:
{
"iisSettings": {
"windowsAuthentication": false,
"...
- 336
28
votes
6
answers
25k
views
Is there a more elegant way to copy specific files using Docker COPY to the working directory?
Attempting to create a container with microsoft/dotnet:2.1-aspnetcore-runtime. The .net core solution file has multiple projects nested underneath the solution, each with it's own .csproj file. I am ...
- 617
28
votes
2
answers
7k
views
.net core 2.0 logging inside Kubernetes pod console
I wrote few web APIs in .net core 2.0 and deployed it using a docker container inside a Kubernetes cluster. I am using the below logging configuration but can't see any logs inside the Kubernetes pod ...
- 938
27
votes
1
answer
1k
views
dotnet core + Angular Universal + docker => Prerendering failed because of error: Error: Cannot find module
We have a project developed using Dotnet core, Angular Universal. We use the prerender feature of Asp.net Core SPA services. In the local environment, the application works both on Windows, Linux. ...
- 607
26
votes
10
answers
66k
views
appSettings.json for .NET Core app in Docker?
I am running a .net core app in a docker container. Here is my docker file (just to build a dev environment):
FROM microsoft/dotnet:1.0.1-sdk-projectjson
ENV ASPNET_ENV Development
COPY bin/Debug/...
- 821
26
votes
2
answers
33k
views
How do I register a new NuGet package source with dotnet CLI on Ubuntu 14.04?
I am running .NET Core 1.1.0 on Ubuntu 14.04, with the goal of hosting my Web APIs in Docker on Ubuntu. I want to build my packages on Ubuntu, but some of the NuGet references are hosted on an ...
- 5,835
26
votes
1
answer
13k
views
Why FileSystemWatcher doesn't work in Linux container watching Windows volume
Given the program:
using System;
using System.IO;
namespace fsw_bug_poc
{
class Program
{
private static FileSystemWatcher _fileSystemWatcher;
static void Main(string[] args)...
- 5,403
25
votes
4
answers
11k
views
How to do gracefully shutdown on dotnet with docker?
Is there a way to gracefully shut-down a DOTNET CORE application which is running in DOCKER? If yes, which event I should listen?
All I want is upon cancellation request I would like to pass my ...
- 9,230
24
votes
6
answers
17k
views
.NET Core Docker Image for SPA Applications
What is the correct Docker image to use when creating a new ASP.NET Core MVC app, specifically with the React/Redux (or other Node.js required) template? If not a specific image, what commands or ...
- 597
23
votes
1
answer
10k
views
.Net Core Machine Key alternative for webfarm
I have been using dotnet core to create an application that runs in a Kubernetes cluster on Linux hosts. As I was testing it noticed getting exceptions when validating the CSRF tokens, that makes ...
- 328
22
votes
5
answers
39k
views
How to add private nuget source in dotnet dockerfile?
I try to add (override) a private nuget source to my build script in order to add the user/pw - and keep it out of my source control. What I tried so far:
nuget is not recognized as command inside ...
- 3,620
22
votes
3
answers
32k
views
Connect to SQL Server database from a docker container
I have docker for windows installed on my machine. There is a console application targeting .net core 1.0.0 that tries to access a SQL Server database running on a different VM. I can ping the VM ...
- 613
21
votes
4
answers
9k
views
dotnet restore incredibly slow inside docker-compose build
I have a .NET Core project that I'm building into a docker image. The Dockerfile looks like this:
FROM mcr.microsoft.com/dotnet/core/sdk:3.0-alpine AS restore
WORKDIR /tmp/build
COPY ./*.sln .
COPY ./...
- 3,643
19
votes
8
answers
26k
views
Install fonts in Linux container for ASP.NET Core
From Visual Studio, I've created a default ASP.NET Core Web Application with enabled Docker support.
It's using the default Microsoft Offical image for Linux container.
Here is my Dockerfile:
FROM ...
- 286
19
votes
3
answers
16k
views
Build docker in ASP.NET Core: "no such file or directory" error
I'm getting an error when I build my docker.
Sending build context to Docker daemon 3.584 kB
Step 1/8 : FROM microsoft/aspnetcore:1.1
---> 2628aaa7b8cf
Step 2/8 : ENV ASPNETCORE_URLS "http://*:...
- 4,044
19
votes
4
answers
17k
views
Should I use user-secrets or environment variables with docker
When using docker with asp.net core for development, should I use user-secrets or environment variables? I am using the default docker file that Visual Studio 2017 creates when adding a project, ...
- 339
18
votes
4
answers
21k
views
Docker File - Skipping Project. Because it was not found
I have a 3 Projects in a solution.
[Solution] 'BuySellApi' (3 Projects)
|
+-- [BuySellApi]
| |
| +--- BuySellApi.csproj (This project holds the Docker file)
|
+-- [BuySellApi.Core]
...
- 641
18
votes
4
answers
17k
views
Dockerized Dotnet Core 2.1 throws Gdip exception when using Select.HtmlToPdf.NetCore
I am using Select.HtmlToPdf.NetCore(18.3.0) to convert Html to pdf in Dotnetcore 2.1. It is perfectly working in local environment but when hosted with Docker it throws an error saying,
{"fileName":...
- 2,247
17
votes
4
answers
20k
views
how to set the environment of dotnet core in docker?
I want to be able to run dotnet core by docker in different environments(for now just development and production) but my docker always start in production environment.
here is my docker file:
FROM ...
- 205
17
votes
2
answers
25k
views
Error The 'ClientId' option must be provided. When building a docker image
I've started a new .net core project and I configured it to use the Google+ Api for authentication. My Client Id and Secret are stored using dotnet user-secrets. When I build my docker image I get
...
- 1,789
16
votes
8
answers
40k
views
Could not execute because the application was not found or a compatible .NET SDK is not installed
I created a basic Rest API using ASP.NET Core 5 i want to make run with docker. The application works fine on IIS Express.
https://learn.microsoft.com/fr-fr/aspnet/core/tutorials/first-web-api?view=...
- 1,345
16
votes
5
answers
4k
views
Visual Studio 2017 Docker - change the target for multi stage builds
If I have a docker file that has multiple stages (such as base and build), is there a way to change the docker command that visual studio uses when debugging the container - it seems to use the first ...
- 3,683
16
votes
1
answer
8k
views
Identity Server 4 and docker
I'm trying to configure IdentityServer4 with docker but I cannot make it work. To get started, I took the Client Credential example of the identity server documentation: Protecting an API using Client ...
- 7,548
15
votes
6
answers
26k
views
where does the "Unable to find fallback package folder" nuget error come from, when building project in a dockerfile?
When building, from a dockerfile, I get this:
/usr/share/dotnet/sdk/3.1.102/Sdks/Microsoft.NET.Sdk/targets/Microsoft.PackageDependencyResolution.targets(234,5): error MSB4018: The "...
- 11.6k
15
votes
2
answers
6k
views
Keep Dotnet Core Grpc Server running as a console application?
I am trying to keep a Grpc server running as a console daemon. This gRPC server is a microservice that runs in a docker container.
All of the examples I can find make use of the following:
Console....
- 1,341
15
votes
1
answer
10k
views
Whats the difference between Unhealthy vs Degraded .NET health check status
I have an application running in Kubernetes. To take the advantage of rolling updates with no downtime, I have to implement the proper Health Checks, so the cluster can know when the application/...
- 5,572
14
votes
3
answers
10k
views
How to customize the docker image name in VS2019
In vs2019, I generate the docker image in the output window, the original command to generate the image was：
docker build -f "e:\work\dotnetcoreproject\rookie.qwt\rookie.qwt.webapi\dockerfile" --...
- 159
14
votes
1
answer
21k
views
Building a Docker image from a multi project dot net core solution
I am trying to build a docker image from a visual studio solution that consists of two projects:
one project contains common code (http methods, logging etc)
the other is the business logic and ...
- 153
14
votes
3
answers
5k
views
How can I target multiple .NET Core versions from a single Docker image?
I have a library that targets .NET Standard 2.0. To verify compatibility, I would like to run my unit tests with the current and long term support (LTS) versions of .NET Core. When this question was ...
- 1,215
14
votes
5
answers
11k
views
adding .net core to docker container with Jenkins
I'm trying to create a dockerfile that will build an image with .net core 2.0 and Jenkins. I'm kind of new to Docker but want to include .net core 2.0 in my container with Jenkins so I don't have to ...
- 177
14
votes
2
answers
18k
views
'dotnet build' command not finding NuGet packages (they exist)
I'm trying to build my .NET Core 2.1 application from the command-line on my Jenkins server.
It builds fine on my local machine (Windows 10, Visual Studio 2017 Enterprise), and if I manually build it ...
- 423
14
votes
1
answer
7k
views
Control lifetime of .NET Core console application hosted in docker
Disclaimer - this is almost the same question as docker container exits immediately even with Console.ReadLine() in a .net core console application - but I don't think accepted answer on this question ...
- 9,851
14
votes
3
answers
15k
views
Output from .NET Core console app by docker logs
Should I see console output (Console.WriteLine) from my .NET Core console app dockerized (linux image) by using docker logs command?
- 298
13
votes
1
answer
15k
views
How to add a edge/testing package to Alpine Linux?
I have an Azure Linux WebApp using docker-compose to run three containers: Asp.Net Core 3.1 WebApp, Nginx as reverse proxy and an Asp.Net Core WebJob (SKD 3) to gerenate PDF reports. The WebApp is at ...
- 855