How to create a database and run ef core migration in docker?

userTqRk 0
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This is my Dockerfile

FROM mcr.microsoft.com/dotnet/nightly/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["MyApi.csproj", "."]
RUN dotnet restore "./MyApi.csproj"
COPY . .
WORKDIR "/src/."
RUN dotnet build "MyApi.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "MyApi.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "MyApi.dll"]

RUN chmod +x ./entrypoint.sh
CMD /bin/bash ./entrypoint.sh

This is entrypoint.sh

#!/bin/bash

set -e
run_cmd="dotnet run --server.urls http://*:80"

until dotnet ef database update; do
>&2 echo "SQL Server is starting up"
sleep 1
done

>&2 echo "SQL Server is up - executing command"
exec $run_cmd
sleep 10

>&2 echo "Creating Database"
/opt/mssql-tools/bin/sqlcmd -S db -U sa -P P@55w0rd -i create-database.sql

This is create-database.sql

USE master
GO

IF NOT EXISTS (SELECT * FROM sys.databases WHERE name = 'Demo')
BEGIN
  CREATE DATABASE Demo;
END;
GO

But when I run it, I got this error

#17 0.615 chmod: cannot access './entrypoint.sh': No such file or directory
#17 ERROR: executor failed running [/bin/sh -c chmod +x ./entrypoint.sh]: exit code: 1
entity-framework-core docker
1 Answers

Your file is not in the directory in which you think it is.

Remember that the WORKDIR command is effectively cd for your Dockerfile. Let's take a close look at the sequence of events in your question.

  1. In the first stage, you have WORKDIR /src. You copy files from your local directory into the /src directory:

    FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build

WORKDIR /src
COPY ["MyApi.csproj", "."]
COPY . .

  2. In your final phase, you copy files from /app/publish into /app:

    FROM base AS final

WORKDIR /app
COPY --from=publish /app/publish .

  3. Your CMD attempts to run entrypoint.sh in current directory, which is /app because of that WORKDIR /app directive:

    CMD bash entrypoint.sh

However, you never explicitly move entrypoint.sh from /src to /app/publish, and while I'm not familiar with the dotnet publish command, I'm guessing that it doesn't move that file for you, either.

The solution is to make sure that entrypoint.sh gets moved into /app. The simplest solution may be to just copy it in explicitly in your final stage:

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
COPY entrypoint.sh /app/entrypoint.sh
ENTRYPOINT ["dotnet", "MyApi.dll"]

CMD /bin/bash ./entrypoint.sh
larsks0
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