What is .build-deps in the following command? I can’t find an explanation in the Alpine docs. Is this a file that is predefined? Is see this referenced in many Dockerfiles. RUN apk add –no-cache –virtual .build-deps \ gcc \ freetype-dev \ musl-dev RUN pip install –no-cache-dir <packages_that_require_gcc…> \ RUN apk del .build-deps 2 Answers 2
Inside my Dockerfile: ENV PROJECTNAME mytestwebsite CMD [“django-admin”, “startproject”, “$PROJECTNAME”] Error: CommandError: ‘$PROJECTNAME’ is not a valid project name What is the quickest workaround here? Does Docker have any plan to “fix” or introduce this functionality in later versions of Docker? NOTE: If I remove the CMD line from the Docker file and then run … Read more
I am trying to change a dockerFile to work with aspell. I have a bash script that i want to wrap in a dock Step 4: Wrap the script in a Docker container. The sample SDK we downloaded earlier contains an example of an action wrapped in a Docker container. In particular, the sample SDK … Read more
(It’s probably a dumb question due to my limited knowledge with Docker or mysql administration, but since I spent a whole evening on this issue, I dare to ask it.) In a nutshell I want to run mysql in a docker container and connect to it from my host. So far, the best I have … Read more
I have installed docker on CentOS 7 by running following commands, curl -sSL https://get.docker.com/ | sh systemctl enable docker && systemctl start docker docker run hello-world NOTE: helloworld runs correctly and no issues. however when I try to run docker-compose (docker-compose.yml exists and valid) it gives me the error on CentOS only (Windows version works … Read more
I am using RUN instruction within a Dockerfile to install a rpm RUN yum -y install samplerpm-2.3 However, I want to pass the value “2.3” as an argument. My RUN instruction should look something like: RUN yum -y install samplerpm-$arg where $arg=2.3 1 Answer 1
While building a Docker image, how do I COPY a file into the image so that the resulting file is owned by a user other than root? 1 Answer 1
Dockerfile.1 executes multiple RUN: FROM busybox RUN echo This is the A > a RUN echo This is the B > b RUN echo This is the C > c Dockerfile.2 joins them: FROM busybox RUN echo This is the A > a &&\ echo This is the B > b &&\ echo This is … Read more
I’m unsure of how to name Dockerfiles. Many on GitHub use Dockerfile without a file extension. Do I give them a name and extension; if so what? Or do I just call them Dockerfile? 11 Answers 11
I’m learning Docker. For many times I’ve seen that Dockerfile has WORKDIR command: FROM node:latest RUN mkdir -p /usr/src/app WORKDIR /usr/src/app COPY package.json /usr/src/app/ RUN npm install COPY . /usr/src/app EXPOSE 3000 CMD [ “npm”, “start” ] Can’t I just omit WORKDIR and Copy and just have my Dockerfile at the root of my project? … Read more
