It’s quite easy to pull images via docker down to your local developer machine. But sometimes you need to get images onto servers which have no access to the World Wide Web (WWW) nor to an internal docker registry. In this article I show you how to use docker save and docker load to get the required images onto those servers.
… or why you should care about “OOMScoreAdjust” in your systemd-enabled docker-images Recently I put together a docker image with “PostgreSQL 9.4” installed from the project’s software repository on “CentOS 7.1” to back a rails application. Unfortunately I was not abled to run the “PostgreSQL”-server in a container based on that image. It failed with exit code 206/OOM_ADJUST. In this article I’m going to describe the reason for the failure using a minimal failing example.
Recently I faced a rather strange issue with networking and docker: I was neither able to install Rubygems in a container nor access any other services on external IP addresses. In this article I’m going to describe how I solved this issue and what I learned about systemd-networkd.
