How to pin OS package versions in Docker image
ScenarioFor 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...
View Articledocker | 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: MYSQL_DATABASE: 'demo' # So you don't have to use root,...
View ArticleDo 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-apacheRUN apt-get update && \ apt-get install -y libghc-postgresql-simple-dev &&\ docker-php-ext-configure...
View ArticleDeploy 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...
View ArticleShould I chunk my docker images in many small layers instead of one large?
When I build docker image for existing applications I try to use as few layers as possible and clean up any unwanted files. For example building an image for moodle:# Dockerfile for moodle instance.#...
View ArticleMultiple apps (microservices) and one proxy (nginx) docker-compose...
Having the following architecture:Microservice 1 + DB (microservice1/docker-compose.yml)Microservice 2 + DB (microservice2/docker-compose.yml)Proxy (proxy/docker-compose.yml)Which of the following...
View ArticleRunning Two infinite commands on single pod/image
I have a Dockerfile with a CMD, it calls a .sh file that runs a Django app( makemigrations, migrate and uwsgi )And that runs fine in a pod.There's a django admin script that runs infinitely that I'd...
View ArticleWhy does running echo with exec form in a Dockerfile create /etc/resolv.conf?
I was trying to build a Docker image from a Dockerfile and I had a line in there which reads:RUN ["echo", "'anything'", ">", "./a_file"]This didn't work, and I eventually had to use:RUN ["sh", "-c",...
View ArticlePermission denied within mounted volume inside Docker/Podman container
I am starting to learn about containers using podman that came with RHEL8.1 (which AFAIK can be used in place of docker), and have the following baby Dockerfile as a learning exercise:# Use Alpine...
View ArticleGrant access permission to file when mounting from host
Below is except of my docker-compose.yml fileI am trying to mount from host file inside the container, which works i.e. able to mountbut then I need to give it permission (my clumsy chown command,...
View Articlewhy use multiple From instructions in multistage build?
I'm new to Docker, sorry if my question sounds dumb.below is a dockerfile from a textbook shows how multistage build works:FROM diamol/base AS build-stage RUN echo 'Building...'> /build.txt FROM...
View ArticleUnable to build Image as it is asking some input
I am trying to create an Image which will run ftp server on centos. Dockerfile content is as below:FROM centosRUN \ yum update -y && \ yum install vsftpd -y EXPOSE 21CMD vsftpd -DFOREGROUNI am...
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Minecraft docker-container refuses connection
So I have this Dockerfile:FROM openjdk:8u212-jre-alpineLABEL maintainer "cowboy_patrick"RUN apk add --no-cache -U \ openssl \ imagemagick \ lsof \ su-exec \ shadow \ bash \ curl iputils wget \ git \ jq...
View ArticleHow to navigate to an index.html with nginx?
This builds and runs without apparent error:root@mordor:/home/nicholas/docker/nginx# root@mordor:/home/nicholas/docker/nginx# docker exec -ti some-nginx bashroot@2c912aa5ce5c:/# root@2c912aa5ce5c:/# ls...
View ArticleHow to copy HTML files to include into nginx?
How do I copy an index.html file into nginx?root@mordor:/home/nicholas/docker/nginx# root@mordor:/home/nicholas/docker/nginx# lltotal 12drwxrwxr-x 2 nicholas nicholas 4096 Nov 13 16:18 ./drwxrwxr-x 3...
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How to correctly copy a file when building an image on Docker Hub?
I have a fairly simple Dockerfile, which works locally. However, when I build it on Docker Hub I get the following error:Starting build of index.docker.io/adius/tasklite:next...Step 1/16 : from...
View ArticleMust the Docker desktop client be running in order for the daemon to be up?...
I recently upgraded docker to 19.03.13 and my docker desktop client version is 2.5.0.1 (49550). Ever since this upgrade, if the docker desktop client is not running, zsh prompts the following when I...
View ArticleCan I build docker image containing ARM executable when running docker build...
I have built on an x86-based Windows laptop a Docker image to be run as a container on an ARM-based architecture (Raspberry Pi 4).Due to ending up with an x86 executable when this is built in the...
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Can't access specific docker container using a mapped port through my host...
I just can't access the project's resource through the mapped port, the weirdest thing is that only this container, the others and with other projects it works fine.It was working pretty well and then...
View ArticleDoes Docker images works without client application
I recently installed Docker in Ubuntu 18.04 and with that, I have downloaded the mariadb image like thisdocker run --name mariadb \-p 3306:3306 \-v /opt/mariadb_data:/var/lib/mysql \-e...
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