Questions tagged [dockerfile]

For questions about Dockerfiles - text files containing instructions to build Docker container images.

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27 views

Do I need header files once I install the php extention on Dockerfile?

Usually when I build docker images for php I use this approach: FROM php:7.2-apache RUN apt-get update && \ apt-get install -y libghc-postgresql-simple-dev &&\ docker-php-...
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0answers
11 views

create entry-point script to get all env variables starting with VUE_APP_ and take it's value

I would like to Dockerize my existing vuejs app for staging , production and I used multi staged approach to create my app container and I'm using Ubuntu 18.04 and this is my, Dockerfile # build ...
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0answers
41 views

Connection failed problem during docker building

I am trying to build my docker comprised of several apps required for bioinformatics analysis of NGS data. But while building my docker, I am always getting an error of connection failed although my ...
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2answers
38 views

docker | database connection refused between two containers

I have a mysql database running with the following docker-compose.yml: version: '3.3' services: db: image: mysql:5.7 restart: always environment: ...
2
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1answer
44 views

How to pin OS package versions in Docker image

Scenario For obvious reasons I believe that every package installed in a Docker image should have their version nailed down. That's why in our Dockerfile we always enforce the OS package manager to ...
1
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1answer
20 views

How to develop a docker container for laravel without laradock or docker-compose

I am very new to docker. I want to build a laravel development environment with docker. I already tried laradock but it seemed complicated for me. I was wondering whether it is possible to create a ...
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0answers
20 views

https - How to enable users to have secure connection with Jenkins via ELB?

Below is the cloud formation template that creates Eastic Load Balancer as public facing to jenkins(jenkins:ecs docker) running in VPC subnet: { "AWSTemplateFormatVersion": "2010-09-09", "...
0
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1answer
47 views

Using 32 bit for savings

What are the downsides for CI servers to use 32 bit Docker images? For example, using FROM i386/python:3.6.9-alpine3.9 instead of python:3.6.9-alpine3.9 in Dockerfile. python:3.6.9-alpine3.9 (32 bit,...
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2answers
28 views

Configure Kubernetes with docker container on Ubuntu VM

I am using the YAML file to deploy the container on Kubernetes with some replication factor on a hosted machine. YAML File apiVersion: apps/v1 kind: Deployment metadata: name: mojo-deployment ...
1
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1answer
256 views

Jenkins does not seem to be running inside a container

I am getting an error while running the Jenkins file tp build and push the docker image into docker hub . you can reveiw my code github : https://github.com/iakshaykr/webapp.git (using jenkins_pipe ...
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1answer
28 views

How to create slave jenkins given master jenkins?

Below code snippet, taken from here creates master jenkins that runs in a container: # Create Docker Group with GID # Set default value of 497 if DOCKER_GID set to blank string by Docker Compose RUN ...
3
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1answer
40 views

Adding default external network in docker-compose

I am trying to learn docker and understanding docker-compose As I was trying out the external network section: networks: default: external: name: my-pre-existing-network I understand ...
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1answer
20 views

How to find the Linux distro used as the basis for an official docker image?

I already think I understand that docker containers "share" the same Linux kernel running on their host. But inside a particular docker container, the software stack could be a distro debian, alpine, ...
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1answer
17 views

Deploy dist file in docker file

How to write a docker file to deploy a dist file of an Angular Application In a server. I see most of them have used nginx as a server. Why is it so? Is there any specific reason I want it to be ...
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2answers
34 views

Docker: PHP deployment in apache, couldn't acces container URL in local browser; shows blank page [closed]

I'm trying to deploy PHP files in Apache container using Dockerfile, Dockerfile on console shows successfully built and tagged but after running the container, i couldn't access the container IP or ...
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1answer
67 views

cannot import OpenCV in a Docker container in Raspberry Pi

I am trying to build a Docker container in Raspbian 10. FROM python:3.5-buster RUN apt-get update RUN apt-get install apt-utils -y RUN apt-get install python-opencv -y RUN apt-get install python3-...
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3answers
77 views

How to automatically update Docker containers in development?

What is the best way to use Docker in development so that a container is automatically updated each time you make a change to the codebase?
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1answer
616 views

npm not found but installed from the shell script file in Dockerfile

I have a following Dockerfile: FROM ubuntu:18.04 RUN mkdir app && cd app WORKDIR app/ RUN apt-get update && apt-get install -y \ software-properties-common \ curl \ sudo ...
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0answers
42 views

Problem with build jenkins on Docker Container with Ubuntu

I Have this Dockerfile and I want build container (based on Ubuntu) and install on him Jenkins. FROM ubuntu:18.04 RUN apt-get update RUN apt-get install -y --no-install-recommends \ gnupg2 \ vim ...
0
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1answer
30 views

Using the built binary of a docker image in another docker image

Problem I have two repositories A and B. I have a docker image registry, where I can push the docker images made of the repositories A and B. I need only the binary of A's source code to be included ...
3
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2answers
174 views

What is the difference between RUN and CMD in a Dockerfile?

I am going to change my permission of files to 600. The following command works perfectly. RUN /bin/bash -c 'chmod 600 /root/.ssh/config' But this one failed CMD /bin/bash -c 'chmod 600 /root/.ssh/...
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2answers
450 views

jar file is not displaying in docker container

I have an sbt project and i am creating its Jar using the sbt publishLocal command and i want a docker image for that i am doing something like this FROM hseeberger/scala-sbt:11.0.2_2.12.8_1.2.8 ...
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2answers
242 views

Docker not exposing port on mojave mac

I used brew to install docker, docker-machine and docker-compose. Everything is working, but when I use expose to map port on my host machine, it is not working. When I ssh in docker machine service ...
1
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1answer
99 views

How to connect to host during a Docker build?

I have a Dockerfile which I want to run some tests inside of as part of a multistage build. The tests attempt to make a connection to localhost, however it appears that they're not able to connect to ...
2
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1answer
928 views

running a phpUnit test within a docker container

i want to run a specific version of phpUnit WITHIN a docker container. This container will use a specific version of php. i.e php:5.6-apache Its a lareval application. i have install phpunit via ...
0
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1answer
32 views

TravisCI build continues to fail even after changing alpine version

So I ran my Docker build with TravisCI and I got a failure like so: FAIL src/App.test.js ● Test suite failed to run TypeError: Cannot assign to read only property 'Symbol(Symbol.toStringTag)' ...
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2answers
34 views

How do i specify the path of a Dockerfile using Blue Ocean

I want my pipeline created using Blue Ocean (Jenkins) to build with a dockerfile that is not in the root of the git repo. How do I achieve this? Our git repo is a collection of sub-projects with each ...
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2answers
56 views

Is there an elegant way to use a Dockerfile argument to tag an image?

I use and argument (ARG) in my Dockerfile to download a particular version of an application. I would like to tag my image with that version number. I end up writing something like that: sh$ ...
0
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1answer
29 views

Dockerized MySql slower in Wifi than ethernet

When I try to connect to a MySQL server that runs in a docker container(in System A) through my application(Running in system B) via wifi, it takes at least 4X amount of time than it would when both ...
1
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1answer
917 views

Dockerfile parse error line 5: unknown instruction: -ESSENTIAL

this is my dockerfile ; FROM ubuntu:16.04 MAINTAINER James Turnbull "james@example.com" ENV REFRESHED_AT 2016-06-01 RUN apt-get update -yqq; apt-get -yqq install ruby ruby-dev build -essential ...
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1answer
388 views

Troubles with mapping ports on a very simple Docker container

I'm new to Docker and following a tutorial on Udemy.com. The turtorial has me setting and running a very simple container. Docker File # Specify a base image FROM node:alpine # Putting files into a ...
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2answers
2k views

Jenkins Dockerfile declarative pipelines: getting the built image tag

I'm trying to get the image tag generated with the help of the dockerfile agent in Jenkins declarative pipelines. This Jenkinsfile is incomplete though, because I still need the deployment steps. ...
2
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3answers
333 views

In a Dockerfile, is there a way to avoid copying files to make them accessible to the RUN command?

I need to build a Docker image containing a pre-populate a database. For now, I am using the following commands in our Dockerfile: COPY db-dump.gz /tmp RUN zcat /tmp/db-dump.gz | mysql But is there ...
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1answer
40 views

Giving a meaningful name to Dockerfile's VOLUME

In Dockerfile we can use VOLUME /some/folder to let docker always create a volume for the specified folder when calling docker run, without having to explicitly use the -v parameter. The volume ...
0
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3answers
122 views

How to get exposed ports from inside of container?

I want to know which port(s) are exposed when user run the image. docker run -p 1000:1234 myimagename I want to get 1234 value in container since I will use it for some configurations(IIS bindings ...
2
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1answer
65 views

What is the best way to put on a repository for a docker image with multiple tags?

I've seen a lot of repositories with Docker images and I think (correct me if my guessing is wrong) that the projects that handle a docker image with multiple tags can be grouped into three groups: ...
0
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1answer
19 views

Reg uploading additional files in docker hub

Is there any possibilities in keeping additional files in the docker hub account along with docker images. There is description page, but I want to maintain additional files for each image I planning ...
1
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1answer
522 views

packge.json not found while executing on Jenkins

My Dockerfile looks something like this. FROM mhart/alpine-node:8.11.3 RUN mkdir -p /app COPY ./ /app WORKDIR /app/build RUN yarn global add serve CMD ["serve", "-l", "3000"] EXPOSE 3000 And ...
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2answers
478 views

Extra none:none images after docker build

I am quite new on docker and tried to build a postgres database image with preset database scheme created on. Thus created below dockerfile #alpine linux version of the postgres image. uses a really ...
1
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1answer
39 views

Using Red Hat Docker image as base image

I am considering using https://access.redhat.com/containers/#/registry.access.redhat.com/rhel7 as a base image for my Dockerfile instead of getting some random image in DockerHub. The main reason is ...
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3answers
79 views

Availability/Reproducibility of Ubuntu Minimal as Docker image

While for Debian you find on Docker Hub "slim" distributions, it seems not the case with Ubuntu. Now there is a "minimal Ubuntu for public clouds" distro from Canonical, but I can find just cloud VM ...
2
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1answer
142 views

How do I prevent service A from being placed in the same node as service B in Docker Swarm?

From the docs, I could only find information about placement restrictions based on node attributes, likes labels and its role. However, I couldn't find how to configure placement based on the services ...
4
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1answer
67 views

When exactly and what for should VOLUME in a Dockerfile be used?

When writing a Dockerfile, I do have the option of specifying volumes, such as: VOLUME /var/www But even without this declaration I am able to mount volumes to this directory and other places, e.g. ...
2
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1answer
52 views

Built codebase doesnt appear after deploying

I'm packaging and shipping a custom code base of Wordpress with a Dockerfile in to my private container registry. Dockerfile: FROM wordpress:latest ADD . /var/www/html Then on the deployment ...
2
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2answers
470 views

Preinstall packages for a nodejs Docker Image according to package.json

I would like to prepare a Docker image for a nodejs project. The developers use package.json to list their node module dependencies. I would like to prepare the Docker image (as base on the Dockerfile)...
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1answer
171 views

Dockerfile COPY command with three input parameters

I've encountered a Multi-stage Build example, where the first stage builds a ngnix server, and the second stage creates a ngnix service from that image. The second stage looks like this: ... # ...
1
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1answer
28 views

what environment does a build “RUN” run in?

When docker build does a RUN command, what "environment" is it running in? Explaining the question, does it run at build time, or when the container starts? Is it using the operating system ...
23
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2answers
9k views

Why use EXPOSE in Dockerfile — since you can bind to all ports anyways

I can docker run -p 3000:3000 image without EXPOSEing that port in the container (see below). If that's true, then why bother putting EXPOSE in the Dockerfile? Is it just for communication to image ...
3
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1answer
367 views

Docker ADD always invalidates cache

I've got problem with my Dockerfile. After building an image it is pushed to repository as cache-image, so on next builds I can pull it and use with --cache-from. Problem is that build stops using ...
1
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2answers
68 views

Docker build not picking up built jar?

I am new to the DevOps world but I am trying to build a pipeline using Jenkins and Docker. I have Jenkins building the docker image by: docker build -f Dockerfile --build-arg jenkins_jar_file=${...