dotnet6 docker build create a none images

[a63245111]

Describe the Bug

In contos 7, i build my images. I found that an empty images was created. Dockerfile generated by vs 2022

my images
PEPOSITORY                     TAG          IMAGE ID           CREATED         SIZE
<none>                            <none>    38885d736caf   8 days ago    1.35GB
<none>                            <none>    5f08df1b82e1   8 days ago    248MB
<none>                            <none>    8bd9a012cf60   8 days ago    1.35GB
api                                        latest    49614d4398c5   10 days ago   255MB
<none>                            <none>    91dde5298666   10 days ago   1.51GB
<none>                            <none>    7594cdd25dfe   11 days ago   255MB
<none>                            <none>    89f995088619   11 days ago   1.51GB
<none>                            <none>    68db2020c1f5   12 days ago   255MB
<none>                            <none>    e0439b5ec9e1   12 days ago   1.51GB
<none>                            <none>    16533f151a3c   3 weeks ago   248MB
mcr.microsoft.com/dotnet/sdk      6.0       c8231459539b   5 weeks ago   715MB
mcr.microsoft.com/dotnet/aspnet   6.0       e38d4d116f1a   5 weeks ago   207MB

Dockerfile

FROM mcr.microsoft.com/dotnet/aspnet:6.0 AS base
WORKDIR /app
EXPOSE 44307

FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
WORKDIR /src
COPY ["NuGet.Config", "."]
COPY ["src/ToPayManage.HttpApi.Host/ToPayManage.HttpApi.Host.csproj", "src/ToPayManage.HttpApi.Host/"]
COPY ["src/ToPayManage.HttpApi/ToPayManage.HttpApi.csproj", "src/ToPayManage.HttpApi/"]
COPY ["src/ToPayManage.Application.Contracts/ToPayManage.Application.Contracts.csproj", "src/ToPayManage.Application.Contracts/"]
COPY ["src/ToPayManage.Domain.Shared/ToPayManage.Domain.Shared.csproj", "src/ToPayManage.Domain.Shared/"]
COPY ["src/ToPayManage.EntityFrameworkCore/ToPayManage.EntityFrameworkCore.csproj", "src/ToPayManage.EntityFrameworkCore/"]
COPY ["src/ToPayManage.Domain/ToPayManage.Domain.csproj", "src/ToPayManage.Domain/"]
COPY ["src/ToPayManage.Application/ToPayManage.Application.csproj", "src/ToPayManage.Application/"]
COPY ["src/ToPayManage.Common/ToPayManage.Common.csproj", "src/ToPayManage.Common/"]
RUN dotnet restore "src/ToPayManage.HttpApi.Host/ToPayManage.HttpApi.Host.csproj"
COPY . .
WORKDIR "/src/src/ToPayManage.HttpApi.Host"
RUN dotnet build "ToPayManage.HttpApi.Host.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "ToPayManage.HttpApi.Host.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENV ASPNETCORE_URLS=http://+:44307

ENTRYPOINT ["dotnet", "ToPayManage.HttpApi.Host.dll"]

Dockerfile

Output of docker version

Version: 20.10.11

Output of docker info

client:
Context: default
Debug Mode: false
Plugins:
app: Docker App (Docker Inc., v0.9.1-beta3)
buildx: Build with BuildKit (Docker Inc., v0.6.3-docker)
scan: Docker Scan (Docker Inc., v0.9.0)

Server:
Containers: 2
Running: 2
Paused: 0
Stopped: 0
Images: 65
Server Version: 20.10.11
Storage Driver: overlay2
Backing Filesystem: extfs
Supports d_type: true
Native Overlay Diff: true
userxattr: false
Logging Driver: json-file
Cgroup Driver: cgroupfs
Cgroup Version: 1
Plugins:
Volume: local
Network: bridge host ipvlan macvlan null overlay
Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
Swarm: inactive
Runtimes: runc io.containerd.runc.v2 io.containerd.runtime.v1.linux
Default Runtime: runc
Init Binary: docker-init
containerd version: 7b11cfaabd73bb80907dd23182b9347b4245eb5d
runc version: v1.0.2-0-g52b36a2
init version: de40ad0
Security Options:
seccomp
Profile: default
Kernel Version: 3.10.0-1160.15.2.el7.x86_64
Operating System: CentOS Linux 7 (Core)
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 3.7GiB
Name: hecs-38405
ID: D4OP:ZVDQ:SSVW:FJP3:7RIQ:JRFC:7O66:ITXU:AIL2:H7EX:ECKN:UVQX
Docker Root Dir: /var/lib/docker
Debug Mode: false
Registry: https://index.docker.io/v1/
Labels:
Experimental: false
Insecure Registries:
127.0.0.0/8
Live Restore Enabled: false

[mthalman]

Can you provide more information about your issue? What does your Dockerfile look like? What command is being run to build it? Are there any error messages?

I found that an empty images was created.

What do you mean by "empty"?

[a63245111]

ok . i submitted. it's a none images ,but it has about 2G size

[mthalman]

You're referring to the <none> that is showing up in the output of docker images? That is completely normal, an implementation of Docker itself, and not related to the .NET Docker images. It just means that Docker's cached images contains an untagged image.

Is there a particular issue you are experiencing with the .NET Docker images? Are you not able to build or execute the container successfully? Please provide more info.

[a63245111]

emmm , Has been successfully built . but after build create two images. the none images more then 1 G size.

[mthalman]

Please be very explicit with what you see as the problem here. Is it strictly the size of the images that are in your Docker cache that you're concerned about?

Be aware that these are intermediate images that are stored by Docker as part of the build and do not indicate the image size of the final image of your application. Those intermediate images are a consequence of the docker build implementation and not specific to .NET images.

To see the final image size of your application, you can run the following command to get the number of bytes: docker inspect --format "{{ .Size }}" <tag>.