In the last week I passed both exams of the CNCF for Kubernetes, first the CKAD (Certified Kubernetes Application Developer) and finally the CKA (Certified Kubernetes Administrator). I’ve been working with Kubernetes and OpenShift for the last 4 years, and I wanted to challenge my knowledge through the certifications. The CKAD exam First I went for the CKAD, even I’m working in the last years very close to system administrators I still fill closer to the Development.
One of the good practices in a data center or a cloud infrastructure is to manage the infrastructure as code. There are many different options in the market as CloudFormation, Heat, terraform, etc. to create and provision the infrastructure and code. On Internet we can find different comparisons for the tools: thoughtworks.com ypoonawala.wordpress.com www.terraform.io CloudFormation and Heat are specific for AWS and OpenStack, and Terraform can be used for multiple cloud providers.
Introduction Once we know how to create a Docker image, if we want to share this image with the team, or use it in different environments, it´s possible to export it to a tar file, or use the Dockerfile to build the image on each of the docker hosts where it will be used. Having to rebuild the image on the pc of each of the components of your team is not very practical.