.Net Core 3.1 Docker 範例

Backend > .NetCore .NetCore Docker

發布時間 : 2022-05-01 17:11

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前言

前言

本篇建立一個 .Net Core 3.1 WebAPI 專案
並參考 .Net Core 3.1 類別庫專案
撰寫 Dockerfile 讓專案跑在 Docker Container 中

建立範例專案

建立 .Net Core 3.1 WebAPI 專案作範例測試

# ~
mkdir dockerSample
cd dockerSample

# ~/dockerSample
dotnet new sln
dotnet new webapi -f netcoreapp3.1 -o dockerSample_WebApi
dotnet new classlib -f netcoreapp3.1 -o dockerSample_Service

# 專案檔 加入 dockerSample_WebApi、dockerSample_Service
dotnet sln add dockerSample_WebApi/dockerSample_WebApi.csproj
dotnet sln add dockerSample_Service/dockerSample_Service.csproj

# dockerSample_WebApi 加入參考 dockerSample_Service
dotnet add dockerSample_WebApi/dockerSample_WebApi.csproj reference dockerSample_Service/dockerSample_Service.csproj

修改 dockerSample_Service > Class1.cs

namespace dockerSample_Service
{
    public class Class1
    {
        public string Test()
        {
            return "dockerSample_Service";
        }
    }
}

修改 dockerSample_WebApi > Controllers > WeatherForecastController.cs

using dockerSample_Service;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Logging;

namespace dockerSample_WebApi.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class WeatherForecastController : ControllerBase
    {
        private readonly ILogger<WeatherForecastController> _logger;

        public WeatherForecastController(ILogger<WeatherForecastController> logger)
        {
            _logger = logger;
        }

        [HttpGet]
        public string Get()
        {
            return new Class1().Test();
        }
    }
}

撰寫 Dockerfile

# ~/dockerSample
echo. > Dockerfile

Dockerfile

# https://hub.docker.com/_/microsoft-dotnet
FROM mcr.microsoft.com/dotnet/sdk:3.1 AS build
WORKDIR /source

# copy csproj and restore as distinct layers
COPY *.sln .
COPY dockerSample_WebApi/*.csproj ./dockerSample_WebApi/
COPY dockerSample_Service/*.csproj ./dockerSample_Service/
RUN dotnet restore

# copy everything else and build app
COPY dockerSample_WebApi/. ./dockerSample_WebApi/
COPY dockerSample_Service/. ./dockerSample_Service/

WORKDIR /source/dockerSample_WebApi
RUN dotnet publish -c release -o /app --no-restore

# final stage/image
FROM mcr.microsoft.com/dotnet/aspnet:3.1
WORKDIR /app
COPY --from=build /app ./
ENTRYPOINT ["dotnet", "dockerSample_WebApi.dll"]

編譯、執行 DockerImage

編譯 Image

# ~/dockerSample
docker build -t dockersample_webapi --no-cache .

# 編譯完成後 查看 Image
docker images

# 輸出
REPOSITORY            TAG       IMAGE ID       CREATED          SIZE
dockersample_webapi   latest    95f60d82602c   2 minutes ago    208MB

建立 Container

docker run --name dockersample_webapi -d -p 8080:80 dockersample_webapi

# 建立完成後 確認 Container
docker ps -a

# 輸出
CONTAINER ID   IMAGE                 COMMAND                  CREATED          STATUS          PORTS                  NAMES
38ac29c81f36   dockersample_webapi   "dotnet dockerSample…"   20 seconds ago   Up 19 seconds   0.0.0.0:8080->80/tcp   dockersample_webapi

呼叫 API 確認功能是否正常
http://localhost:8080/weatherforecast

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