How do I set resources allocated to a container using docker?

As the title of this question suggests I’m wanting to set max disk/memory and cpu usage for a container using docker ( Is there a way to do this using just docker?

Kubernetes equivalent of env-file in Docker

Background: Currently we’re using Docker and Docker Compose for our services. We have externalized the configuration for different environments into files that define environment variables read by the application. For example a prod.env file: ENV_VAR_ONE=Something Prod ENV_VAR_TWO=Something else Prod and a test.env file: ENV_VAR_ONE=Something Test ENV_VAR_TWO=Something else Test Thus we can simply use the prod.env […]

How to run a cron job inside a docker container?

I am trying to run a cronjob inside a docker container that invokes a shell script. Yesterday I have been searching all over the web and stack overflow, but I could not really find a solution that works. How can I do this? EDIT: I’ve created a (commented) github repository with a working docker cron […]

Docker on Ubuntu can't saturate CPU

I have a simple Ruby app, basically it gets some data via HTTP endpoint, processes it a little, groups it and sends it in batches to some remote HTTP endpoint. When I run this on bare-metal – I saturate 4 CPUs to 100% and get about 3000reqs/s (according to ab; the app is a bit […]

How to change nginx config in amazon elastic beanstalk running a docker instance

After i login and the cookie is set I get error 502. When i read the log i get the error: 014/05/17 01:54:43 [error] 11013#0: *8 upstream sent too big header while reading response header from upstream, client:, server: , request: “GET /administration HTTP/1.1”, upstream: After some fast googling i found: and I […]

How to force docker for clean build of an image?

I have build docker image from docker file using below command. $ docker build -t u12_core -f u12_core . when I am trying to rebuild it with same command, it’s using build cache like Step 1 : FROM ubuntu:12.04 —> eb965dfb09d2 Step 2 : MAINTAINER Pavan Gupta <> —> Using cache —> 4354ccf9dcd8 Step 3 […]

Exploring Docker container's file system

I’ve noticed with docker that I need to understand what’s happening inside a container or what files exist in there. One example is downloading images from the docker index – you don’t have a clue what the image contains so it’s impossible to start the application. What would be ideal is to be able to […]

Docker expose all ports or range of ports from 7000 to 8000

Can I specify a port range in a Dockerfile EXPOSE 7000-8000 and when running the container bind all these exposed ports to the same ports on the host machine? docker run -p 7000-8000:7000-8000

Where are docker images stored by boot2docker?

I’m playing around with Docker on OS X (with boot2docker) and can’t figure out where these images are being stored. I’m just curious. This question answers it for Linux which is apparently in /var/lib/docker/graph/<id>/layer I installed via Homebrew and poked around in /usr/local/Cellar/docker but it doesn’t look like it’s there. There’s a boot2docker-vm.vmdk in ~/.boot2docker. […]

Stopping docker containers by image name – Ubuntu

On Ubuntu 14.04 I’m looking for a way to stop a running container and the only information I have is the image name that was used in the docker run command. Is there a command to find all the matching running containers that match that image name and stop them?

Docker will be the best open platform for developers and sysadmins to build, ship, and run distributed applications.