How to configure different dockerfile for developm

问题:

I use docker for development and in production for laravel project. I have slightly different dockerfile for development and production. For example I am mounting local directory to docker container in development environment so that I don't need to do docker build for every change in code.

As mounted directory will only be available when running the docker container I can't put commands like "composer install" or "npm install" in dockerfile for development.

Currently I am managing two docker files, is there any way that I can do this with single docker file and decide which commands to run when doing docker build by sending parameters.

What I am trying to achieve is

In docker file

...
IF PROD THEN RUN composer install
...

During docker build

docker build [PROD] -t mytag .

回答1:

You can use two different Dockerfiles.

# ./Dockerfile (non production)
FROM foo/bar
MAINTAINER ...

# ....

And a second one:

# ./Dockerfile.production
FROM foo/bar
MAINTAINER ...

RUN composer install

While calling the build command, you can tell which file it should use:

$> docker build -t mytag .
$> docker build -t mytag-production -f Dockerfile.production .

回答2:

As a best practice you should try to aim to use one Dockerfile to avoid unexpected errors between different environments. However, you may have a usecase where you cannot do that.

The Dockerfile syntax is not rich enough to support such a scenario, however you can use shell scripts to achieve that.

Create a shell script, called install.sh that does something like:

if [ ${ENV} = "DEV" ]; then 
    composer install
else
    npm install
fi

In your Dockerfile add this script and then execute it when building

...
COPY install.sh install.sh
RUN chmod u+x install.sh && ./install.sh
...

When building pass a build arg to specify the environment, example:

docker build --build-arg "ENV=PROD" ...

回答3:

I have whent though seleveral methods like doing that through docker-compose,multi stage,passing arg through file and like what they have specified above My company need to make a good way to do that and I was going through some of the method and here is my opinion

The best method is to pass the arg through the cmd and you can pass it through vscode also while right clikcing and clicking build image Image of visual studio code while clikcing image build and in the code as

ARG BuildMode
RUN echo $BuildMode
RUN if [ "$BuildMode" = "debug" ] ; then apt-get update \
    && apt-get install -y --no-install-recommends \
       unzip \
    && rm -rf /var/lib/apt/lists/* \
    && curl -sSL https://aka.ms/getvsdbgsh | bash /dev/stdin -v latest -l /vsdbg ; fi

and in the build section of dockerfile

ARG BuildMode
ENV Environment=${BuildMode:-debug}
RUN dotnet build "debugging.csproj" -c $Environment -o /app

FROM build AS publish
RUN dotnet publish "debugging.csproj" -c $Environment -o /app

回答4:

You can use build args directly without providing additional sh script. Might look a little messy, though. But it works.

Dockerfile must be like this:

FROM alpine
ARG mode
RUN if [ "x$mode" = "xdev" ] ; then echo "Development" ; else echo "Production" ; fi

And commands to check are:

docker build -t app --build-arg mode=dev .
docker build -t app --build-arg mode=prod .