How can I use an ephemeral volume for a Docker container using an official MySQL image with docker-compose?

I’m using an official MySQL docker image ( with docker-compose and I would like its data to be wiped out upon restart. The default is that it retains its data between container restarts. Here’s my docker-compose.yml: version: “2” services: mydb: image: mysql:5.6 environment: MYSQL_ROOT_PASSWORD: foo When I use docker inspect on my container it shows […]

Installing Pillow requirements on debian Jessie

I’m trying to install Pillow and requirements in a Docker container based on the official images which I believe use Debian Jessie, but some of the installation packages I would install on Ubuntu aren’t available in Debian it seems. In particular, they are libwebp-dev, tcl8.6-dev, tk8.6-dev, python-tk If I search for these online I do […]

How does docker manage hashes for forking of docker images?

In docker, its clear that i can pull other people’s images and run them. But somehow, docker seems to know if i’ve ever pushed a layer , and is able to skip pushing that image. I thus have two questions : How does dockerhub store image hashes – are the image hashes shared between docker […]

Dockerizing Spring Boot App with Postgresql

I am trying to create a Docker container for a Spring Boot application which uses PostgreSQL as database. My aim is build a container which runs app as well as PostgreSQL. I created a Dockerfile as below: FROM ubuntu:15.10 LABEL version=”1″ ADD app.jar app.jar RUN bash -c ‘touch /app.jar’ # Install Java, Postgresql …… USER […]

Netcating from client to server with docker-ed application lags initially

I have a client and server in an en enterprise environment. netcating client to server is instant. _______SERVER______ ______CLIENT_______ | | | | | | <———> | | | | | | |___________________| |___________________| > netcat -l 8000 > netcat 8000 blahblah blahblah However netcating with a container on the server.. _______SERVER______ ______CLIENT_______ […]

How to properly check if a Symfony application is installed?

In our Dockerfile’s I need to check (actually the database) to see if there’s an application currently installed and if not run a php app/console command. This is my current approach: CHECK=$(php app/console doctrine:query:sql “SELECT * FROM user” -q) if [ $? -ne 0 ]; then php app/console vendor:install fi Which doesn’t feel right. […]

Use docker build step plugin in Jenkins docker container

I have a jenkins server inside a docker container: I’ve edit the base image so I’m able to mount the docker sockets to my container and use the sockets as jenkins user. docker run -d -u jenkins –name jenkins -p 50000:50000 -p 8080:8080 –volumes-from jenkins-volume –restart=always -v /var/run/docker.sock:/var/run/docker.sock test/jenkins:1.0 So I’m able to perform commands […]

Issue with Docker Toolbox

I have been getting the following problem after getting Docker set-up on a Mac OS using the Docker Toolbox: Pulling repository Error while pulling image: Get x509: certificate signed by unknown authority I have seen some potential solutions to this problem on StackOverflow, but none of them seems to be working for me. […]

Error response from daemon: Container CONTAINER_NAME is not running

I have a docker image dajobe/hbase and its been built from Ubuntu. I created a container of this image and named it hb. $ docker run -d –name hb dajobe/hbase e1f68ff8b3b6c5e474426e2566f8c087d6a785fc5eeb58cd2aeb86176068651d I then started the /bin/bash on hb, and checked for the availability of the vi editor. $ docker exec -it hb /bin/bash root@e1f68ff8b3b6:/# vi […]

How use Dokku with django?

I try use dokku for my web projects – deployment become cool. But I can’t find information about two things. Can I autocreate database from dokku-util? How? How and where store media files without using AWS? I want use only my vps’. P.S. Or may be you see good materials about full workflow for dokku?

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