前一段时候使用 Dockerfile 重新部署 NetCore3.1 项目的时候很顺利，由来由于一些原因，我把以前的镜像删除，如果我们大家继续使用 docker  build 命令去生成镜像的话就会报错，例如：
　　　　

 1 [root@localhost PatrickLiu.NetCore]# docker build -t core31v1.112 -f Dockerfile .

 2 Sending build context to Docker daemon  4.425MB

 3 Step 1/17 : FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base

 4  ---> e3559b2d50bb

 5 Step 2/17 : WORKDIR /app

 6  ---> Using cache

 7  ---> 1c0ab1a505e2

 8 Step 3/17 : EXPOSE 80

 9  ---> Using cache

10  ---> 49a72547d567

11 Step 4/17 : EXPOSE 443

12 unable to find image "sha256:c5ed536f38a6742b7c084fa87e6ac885d9697960a20860f7fd0299da578cf2c8"

　　这样肯定是不行的，我们肯定希望使用没有缓存的方式重新加载文件生成镜像，怎么做呢？

　　问题

　　　　你想不用缓存重建Dockerfile。

　　解决方法

　　　　构建镜像时使用 --no-cache 参数。

　　讨论

　　　　为了强制docker构建镜像时不用缓存，执行带–no-cache参数的docker build命令。下面的示例是使用了–no-cache构建镜像。

　　效果如下：

 1 [root@localhost PatrickLiu.NetCore]# docker build --no-cache -t core31v1.112 -f Dockerfile .

 2 Sending build context to Docker daemon  4.425MB

 3 Step 1/17 : FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base

 4  ---> e3559b2d50bb

 5 Step 2/17 : WORKDIR /app

 6  ---> Running in e8178063fe45

 7 Removing intermediate container e8178063fe45

 8  ---> 0a1d582b30d4

 9 Step 3/17 : EXPOSE 80

10  ---> Running in e7716f388165

11 Removing intermediate container e7716f388165

12  ---> fc54a6e3c0aa

13 Step 4/17 : EXPOSE 443

14  ---> Running in 449680497b7f

15 Removing intermediate container 449680497b7f

16  ---> acf106867ca0

17 Step 5/17 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build

18 3.1-buster: Pulling from dotnet/core/sdk

19 e4c3d3e4f7b0: Pull complete

20 101c41d0463b: Pull complete

21 8275efcd805f: Pull complete

22 751620502a7a: Pull complete

23 8e306865fd07: Pull complete

24 9d2f53e752c2: Downloading [===========================>                       ]  69.19MB/123.8MB

25 143a93e01eba: Download complete

　　镜像文件重新生成，没有使用缓存，每天进步一点点，把问题记录下来，这就是成长了。继续努力。

　　镜像最后生成的胜利步骤。

 1 [root@localhost PatrickLiu.NetCore]# docker build --no-cache -t core31v1.112 -f Dockerfile .

 2 Sending build context to Docker daemon  4.425MB

 3 Step 1/17 : FROM mcr.microsoft.com/dotnet/core/aspnet:3.1-buster-slim AS base

 4  ---> e3559b2d50bb

 5 Step 2/17 : WORKDIR /app

 6  ---> Running in e8178063fe45

 7 Removing intermediate container e8178063fe45

 8  ---> 0a1d582b30d4

 9 Step 3/17 : EXPOSE 80

10  ---> Running in e7716f388165

11 Removing intermediate container e7716f388165

12  ---> fc54a6e3c0aa

13 Step 4/17 : EXPOSE 443

14  ---> Running in 449680497b7f

15 Removing intermediate container 449680497b7f

16  ---> acf106867ca0

17 Step 5/17 : FROM mcr.microsoft.com/dotnet/core/sdk:3.1-buster AS build

18 3.1-buster: Pulling from dotnet/core/sdk

19 e4c3d3e4f7b0: Pull complete

20 101c41d0463b: Pull complete

21 8275efcd805f: Pull complete

22 751620502a7a: Pull complete

23 8e306865fd07: Pull complete

24 9d2f53e752c2: Pull complete

25 143a93e01eba: Pull complete

26 Digest: sha256:bfd6083e9cd36b37b2a4e9f1722cc958b6654fa96cb3d84ef78492ecf00dcd32

27 Status: Downloaded newer image for mcr.microsoft.com/dotnet/core/sdk:3.1-buster

28  ---> 5fe503d51830

29 Step 6/17 : WORKDIR /src

30  ---> Running in 4312c5d63f3f

31 Removing intermediate container 4312c5d63f3f

32  ---> 31cfbe6739ec

33 Step 7/17 : COPY ["PatrickLiu.NetCore.MvcDemo/PatrickLiu.NetCore.MvcDemo.csproj", "PatrickLiu.NetCore.MvcDemo/"]

34  ---> ba9ba79cc7d3

35 Step 8/17 : RUN dotnet restore "PatrickLiu.NetCore.MvcDemo/PatrickLiu.NetCore.MvcDemo.csproj"

36  ---> Running in 8d2c9ee24614

37   Determining projects to restore...

38   Restored /src/PatrickLiu.NetCore.MvcDemo/PatrickLiu.NetCore.MvcDemo.csproj (in 4.64 sec).

39 Removing intermediate container 8d2c9ee24614

40  ---> 872cce519821

41 Step 9/17 : COPY . .

42  ---> 4fe062b14ab1

43 Step 10/17 : WORKDIR "/src/PatrickLiu.NetCore.MvcDemo"

44  ---> Running in 431b1c2f4959

45 Removing intermediate container 431b1c2f4959

46  ---> b9dc3acf883c

47 Step 11/17 : RUN dotnet build "PatrickLiu.NetCore.MvcDemo.csproj" -c Release -o /app/build

48  ---> Running in 639b5e3d01df

49 Microsoft (R) Build Engine version 16.7.0+7fb82e5b2 for .NET

50 Copyright (C) Microsoft Corporation. All rights reserved.

51

52   Determining projects to restore...

53   All projects are up-to-date for restore.

54   PatrickLiu.NetCore.MvcDemo -> /app/build/PatrickLiu.NetCore.MvcDemo.dll

55   PatrickLiu.NetCore.MvcDemo -> /app/build/PatrickLiu.NetCore.MvcDemo.Views.dll

56

57 Build succeeded.

58     0 Warning(s)

59     0 Error(s)

60

61 Time Elapsed 00:00:19.21

62 Removing intermediate container 639b5e3d01df

63  ---> aeb1df18b3f6

64 Step 12/17 : FROM build AS publish

65  ---> aeb1df18b3f6

66 Step 13/17 : RUN dotnet publish "PatrickLiu.NetCore.MvcDemo.csproj" -c Release -o /app/publish

67  ---> Running in ac663a5be455

68 Microsoft (R) Build Engine version 16.7.0+7fb82e5b2 for .NET

69 Copyright (C) Microsoft Corporation. All rights reserved.

70

71   Determining projects to restore...

72   All projects are up-to-date for restore.

73   PatrickLiu.NetCore.MvcDemo -> /src/PatrickLiu.NetCore.MvcDemo/bin/Release/netcoreapp3.1/PatrickLiu.NetCore.MvcDemo.dll

74   PatrickLiu.NetCore.MvcDemo -> /src/PatrickLiu.NetCore.MvcDemo/bin/Release/netcoreapp3.1/PatrickLiu.NetCore.MvcDemo.Views.dll

75   PatrickLiu.NetCore.MvcDemo -> /app/publish/

76 Removing intermediate container ac663a5be455

77  ---> 6ffbf30a49af

78 Step 14/17 : FROM base AS final

79  ---> acf106867ca0

80 Step 15/17 : WORKDIR /app

81  ---> Running in 3dca58d70bef

82 Removing intermediate container 3dca58d70bef

83  ---> 37d1ad5bb22b

84 Step 16/17 : COPY --from=publish /app/publish .

85  ---> 09de2a366451

86 Step 17/17 : ENTRYPOINT ["dotnet", "PatrickLiu.NetCore.MvcDemo.dll"]

87  ---> Running in 2c41d28e90dc

88 Removing intermediate container 2c41d28e90dc

89  ---> 8bf4c94fbc04

90 Successfully built 8bf4c94fbc04

91 Successfully tagged core31v1.112:latest

　　　　结束了。

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