Devops and Docker

The holiday period between Christmas and New Year is an ideal period to catch up on some reading and experimenting. Devops and tools such as Docker, Vagrant, Chef, Puppet and Ansible were on my radar for a while. So finally some time to dive into this topics.

Nested VMs

Not to mess up my machine, I use VMWare workstation to spin up some test machines. As these Devops tools are all about creating and provisioning virtual machines, one must enable “Nested VMs” support. This allows one virtual machine to run in another.

Docker

Docker appeared on my radar while learning about Micro Services. Docker focuses on the creation of light-weight containers in which applications are configured in an automated manner.

The Linux Containers are very small by leveraging OS level virtualization of Linux. Is it some “chroot on rocks”. The chroot system call on Unix/Linux changes the root directory for a program and all of its children. chroot allows programs – e.g. a web server – to run in a more protected mode. The OS level virtualization can limit all the resources used by child processes: CPU, memory, disk space, … Because containers are so light-weight, many of them can be run on a single machine. This mechanism allows each application to run in its own container, its own virtualized OS.

To have a quick try of Docker, there is a great Online Tutorial consisting of 10 steps. Recommended!

As there aren’t any books available on Docker, I watched the brand new training material of LiveLessons. As I couldn’t find the text material, had to type over the instructions from the paused video. After wasting some time trying to get access the Fedora Atomic container on the Fedora 21 host, decided to switch to another topic, Vagrant. If I have some more time, I’ll come back and retry with RHEL as used in the video training. Or switch to Windows and take a look boot2docker.

Author: Guy

blogger

blogger

Curious to know more about this topic?

Working at i8c

i8c is a system integrator that strives for an informal atmosphere between its employees, who have an average age of approx 30 years old. We invest a lot of effort in the professional development of each individual, through a direct connection between the consultants and the management (no multiple layers of middle management). We are based in Kontich, near Antwerp, but our customers are mainly located in the triangle Ghent-Antwerp-Brussels and belong to the top 500 companies in Belgium (Securex, Electrabel, UCB, etc…).

Quality Assurance

i8c is committed to delivering quality services and providing customer satisfaction. That’s why we invested in the introduction of a Quality Management System, which resulted in our ISO9001:2000 certification. This guarantees that we will meet your expectations, as a reliable, efficient and mature partner for your SOA & integration projects.

i8c - ISO9001-2015

Also worth reading

AWS AppFlow: Streamlining SaaS Integrations with AWS Services

In today’s digital world, organizations are constantly looking for ways to streamline their workflows and improve their data management processes. One of the key challenges that organizations face is integrating their various software as a service (SaaS) applications with their data management systems. This is

Read More »

Apigee Scope Validation using OpenAPI Specification

In API security and management, we often use a lot of different security mechanisms to protect the requested resource behind the API Gateway. One of these mechanisms is the validation of scopes to authorize a client on a specific sub-resource of the API. Most of

Read More »