What is .build-deps for apk add –virtual command?
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? … Read more
dockerfile
How can I use a variable inside a Dockerfile CMD?
Inside my Dockerfile: ENV PROJECTNAME mytestwebsite CMD [“django-admin”, “startproject”, “$PROJECTNAME”] Error: CommandError: ‘$PROJECTNAME’ is not a valid project name What is the quickest … Read more
/bin/sh: apt-get: not found
I am trying to change a dockerFile to work with aspell. I have a bash script that i want to wrap in a … Read more
Connect to mysql in a docker container from the host
(It’s probably a dumb question due to my limited knowledge with Docker or mysql administration, but since I spent a whole evening on … Read more
Why is Docker installed but not Docker Compose?
I have installed docker on CentOS 7 by running following commands, curl -sSL https://get.docker.com/ | sh systemctl enable docker && systemctl start docker … Read more
How to pass arguments to a Dockerfile?
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 … Read more
How do I Docker COPY as non root?
While building a Docker image, how do I COPY a file into the image so that the resulting file is owned by a … Read more
Multiple RUN vs. single chained RUN in Dockerfile, which is better?
Dockerfile.1 executes multiple RUN: FROM busybox RUN echo This is the A > a RUN echo This is the B > b RUN … Read more
How to name Dockerfiles
I’m unsure of how to name Dockerfiles. Many on GitHub use Dockerfile without a file extension. Do I give them a name and … Read more
What is the point of WORKDIR on Dockerfile?
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 … Read more