本篇同步發文在個人Blog: 一袋.NET要扛幾樓？打造容器化的ASP.NET Core網站！系列文章 - (22) 建立購物車系統 - 5

1. 建立Dockerfile

　　在CartApi專案右鍵=>加入=>Dokcer支援，選擇目標平台Linux，將會在根目錄新增Dockerfile檔案，需要再手動修改，變成下方的內容。其內容主要功能是在Docker容器內載入NET Core SDK編譯我們的程式碼，將編譯後的目錄檔案複製到Runtime環境的/app目錄，再用NET Core Runtime執行購物車服務。

    FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build
    
    WORKDIR /code
    EXPOSE 80
    
    COPY . .
    
    RUN dotnet restore
    
    RUN dotnet publish -o /out/ -c Release
    
    FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base
    
    COPY --from=build /out /app/
    
    WORKDIR /app
    
    ENTRYPOINT ["dotnet", "CartApi.dll"]

2. 修改dokcer-compose.yml

在docker-compose.yml加入CartApi的container，如下方的yml。主要的參數包含：

• build的dockerfile：Dockerfile的檔名
• build的context：購物車系統的Dockerfile所在的目錄
• environment：這些參數將會覆蓋appSettings.json的內容，包含Redis的連線資訊。
• ports：將此Api的80 port對應為本機的7400
• depends_on：需要先等redis的容器啟動完，才輪到此Api啟動容器
• networks：設計在frontend/backend的網路區域

    version: "3.4"
    
    networks:
       frontend:
       backend:
       
    services:
       webmvc:
          build:
             context: .\src\Presentation\WebMvc
             dockerfile: Dockerfile
          environment:
             - CatalogUrl=http://catalog
             - IdentityUrl=https://${RPGSHOP_EXTERNAL_DNS_NAME_OR_IP}:7101
             - CallBackUrl=http://${RPGSHOP_EXTERNAL_DNS_NAME_OR_IP}:7500/
          container_name: rpgwebmvc
          ports:
             - "7500:80"
          networks:
             - frontend
          depends_on:
             - catalog
             - auth
    
       catalog:
          build:
             context: .\src\Services\CatalogApi
             dockerfile: Dockerfile
          image: rpgshop/catalog
          environment:
             - DatabaseServer=mssqlserver
             - DatabaseName=CatalogDb
             - DatabaseUser=sa
             - DatabasePassword=JustTest!
             - ExternalCatalogBaseUrl=http://${RPGSHOP_EXTERNAL_DNS_NAME_OR_IP}:7000
          container_name: rpgcatalogapi
          ports:
             - "7000:80"
          networks:
             - backend
             - frontend
          depends_on:
             - mssqlserver
    
       auth:
          build:
             context: .\src\Services\AuthApi
             dockerfile: Dockerfile
          image: rpgshop/auth
          environment:
             - MvcClient=http://${RPGSHOP_EXTERNAL_DNS_NAME_OR_IP}:7500
             - DatabaseServer=mssqlserver
             - DatabaseName=AuthDb
             - DatabaseUser=sa
             - DatabasePassword=JustTest!
             - ExternalCatalogBaseUrl=http://${RPGSHOP_EXTERNAL_DNS_NAME_OR_IP}:7000
             - ASPNETCORE_URLS=http://+:80;https://+:443
             - ASPNETCORE_Kestrel__Certificates__Default__Password=crypticpassword
             - ASPNETCORE_Kestrel__Certificates__Default__Path=./AuthApi.pfx
          container_name: rpgauthapi
          ports:
             - "7100:80"
             - "7101:443"
          networks:
             - backend
             - frontend
          depends_on:
             - mssqlserver
    
       cart:
          build:
             context: .\src\Services\CartApi
             dockerfile: Dockerfile
          image: rpgshop/cart
          environment:
             - ConnectionString=cart.data
          container_name: rpgcartapi
          ports:
             - "7400:80"
          networks:
             - backend
             - frontend
          depends_on:
             - cart.data
    
       mssqlserver:
          image: "microsoft/mssql-server-linux:latest"
          ports:
             - "1445:1433"
          container_name: rpgmssqlcontainer
          environment:
             - ACCEPT_EULA=Y
             - SA_PASSWORD=JustTest!
          networks:
             - backend
    
       cart.data:
          image: redis
          ports:
             - "6377:6379"
          networks:
             - backend

3. 用cmd執行docker-compose

目前只先執行購物車服務，所以用cmd在docker-compose.yml所在位置輸入指令：

    docker-compose build
    docker-compose up cart.data cart

執行完後，在瀏覽器輸入http://docker.for.win.localhost:7400/swagger ，顯示Swagger對API的功能，如圖1。

圖1