What does “copy . .” mean? Thank you.
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The
COPYinstruction copies new files or directories from<src>and adds them to the filesystem of the container at the path<dest>
Also
The
<dest>is an absolute path, or a path relative toWORKDIR
@terpz “COPY . .” Please explain me!
What is happening in Line 11? Aren’t SRC and DEST the same?
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Hi @jayjani008
It means the same thing yes, the dot is “where i am now”
So it will copy everything from the same place as the dockerfile, to “where i am now” in the container.
The “where i am now” in the image/container is defined by https://docs.docker.com/engine/reference/builder/#workdir
So if you set:
WORKDIR /tmp
and do
COPY . .
It will copy everything in the current folder, to /tmp
Hope that makes sense 
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what does .e mean in COPY --from=builder /out/ .e
the complete docker file is below…
FROM mcr.microsoft.com/dotnet/core/sdk:3.0.100-preview9 AS builder
WORKDIR /src
COPY src/DotNetConf2019.csproj .
RUN dotnet restore
COPY src/ .
RUN dotnet publish -c Release -o /out DotNetConf2019.csproj
app image
FROM mcr.microsoft.com/dotnet/core/runtime:3.0.0-preview9
WORKDIR /app
ENTRYPOINT ["/bin/sh"]
ENV DotNetBot:Message=“docker4theEdge!”
COPY --from=builder /out/ .e
@sasidhar6696, im not sure why you would do it, but in that way a folder in WORKDIR (/app) will be created, named “.e”, fullpath: /app/.e
@terpz
Thanks for the reply . I am new to docker, This is one of the practice examples at https://github.com/dockersamples/dotnetconf19
I am pretty much sure its not creating a directory .e under /app, when I logged into container’s terminal, there isn’t “/app/.e”!!
How do you check?
remember its a dot file (hidden) so either cd /app/.e or ls -la /app
else I have no idea
Hello. Do you speak English?
Dopy command: COPY src dest copies files from a local source location to the destination in the Docker container. So COPY. . command copies everything from the root directory of the Dockerfile to the container.