Are you looking to run a base image and check things out inside with docker?

If you are just looking to run an image with docker and be able to interact with the shell then, … More

Learning Docker from Hello exercise

If you are looking for to learn Docker, following a hello exercise to help you with it. Let’s create a … More

How to clean my local docker and prune all images?

Following the command. $ docker system prune -a

[Docker] – Using –build-arg to use safely confidential information to build docker images

In this post, we will do an example by using the flag –build-arg to build the image with a piece of … More

Why is not safe to use confidential data in the containers environment variables?

Remember that containers are just a “process”. Then, it means that the values of the environment variables can be found … More

[Docker] – Understanding Docker Container Networking

Docker creates automatically 3 networks as follows. $ docker network ls NETWORK ID NAME … More

[Docker] – Understanding Docker Images

They are nothing more than a text file called Dockerfile with the instructions which are required to build a container. Then, … More

Understanding containers in 15 minutes

We will use here the Docker containers as an example. However, beware that it is NOT the only existent solution … More

[Ansible] – How to create an Ubi/rhel7 image with ansible and python3?

Following an example over how to install ansible with python3 in a centos/rhel7 docker image. FROM registry.access.redhat.com/ubi7/ubi … RUN mkdir … More

Why use UBI minimal images for run applications in containers?

UBI minimal is smaller than the UBI ones and as the name says has the minimal as possible. So, because … More