TECH BASICS

I am using docker for container image build and deployment for almost 2–3 years and sometimes I struggled to get my storage back. By default, docker does not clear unused objects such as images, containers, networks, and volumes. This causes a high amount of disk usage by Docker.

In this post, I will try to cover quick steps to analyze and clean up this data.

You can list the statistics of docker file system usage by inbuilt command -

arun@controller:~$ sudo docker system df
TYPE            TOTAL     ACTIVE    SIZE      RECLAIMABLE
Images          15        0         2.674GB   2.674GB …

KUBERNETES CAFE

PODs mount volume inside Containers and they access the storage like it’s their local file-system. Even you can share data between containers in the same pod using a shared volume.

Kubernetes Pods are immutable!

Kubernetes Container Orchestrator manages PODs(Containers). If you are familiar with the concept of Container or PODs then you know that PODs are ephemeral. It means if a pod dies it can never be resurrected, all data which it has generated dies with it.

So if you want to store or save the state or data then Kubernetes volume abstraction comes into the picture. This volume is similar to Docker Volume…

TECH BASICS

When you deploy components or systems in Kubernetes, you have to work with YAML files. You create a set of few Kubernetes object files and deploy it via running the kubectl create or apply command. This approach is pretty okay when you are dealing with one Environment and a limited set of objects. This approach gets little difficult to manage with multiple environments and number of customization objects. Every environment may be unique, may have a different set of requirements. There can be a lot of solutions which can help you in this situation. Helm, Kustomize, Kapitan, Ksonnet .. the…

PYTHON BASICS

_ _name_ _ variable

In python, you may write a script specifically keeping all your functions and import that script as a module in another script. __name__ is a built-in variable that evaluates the name of the current module.

This variable decides whether you want to run the script or you want to import the functions defined in the script.

there is no main() function in Python. If the source file is executed as the main program, the interpreter sets the __name__ variable to have a value “__main__”. …

TECH BASICS, CODEX

In this post, I am going to cover very basic steps to deploy Jenkins on the Kubernetes cluster which I have built using kubeadm. The k8s cluster will host Jenkins and agents to run pipelines. I assume you have good understanding of Kubernetes and Jenkins concepts. A working Kubernetes cluster and kubectl is required to perform all steps.

Kubernetes is an open-source container orchestrator. It is a container-centric application that has become the de facto standard to deploy and operate containerized applications. Modern applications are increasingly built using containers and leveraging the power of K8s’s seamless deployment processes.

Jenkins is…

TECH BASICS, CODEX

This post outlines details regarding Ansible an automation tool. It assumes that you have good understanding of Linux and concepts of DevOps.

Configuration management

Configuration management refers to the task or process, in which we track and control changes to a managed systems, keeping integrity in place. Managed systems can include software, servers, infrastructure components, etc.

Doubt: What will happen if we do not have CM?

Modern IT systems are often deployed in a large-scale manner including on cloud and on-premises using automation. Think about what will happen, if we can not keep track of configuration! …

TECH BASICS

Part-1: Jenkins

If I mention open source continuous integration or continuous delivery (CI/CD) tools, the name of Jenkins will automatically pop-up. Easy set-up and deployment make it one of the most powerful tools present in the market which can support the entire software delivery pipeline.

Part-2: Jenkins X

An open-source project that offers automated CI/CD for cloud-native applications on Kubernetes. Jenkins X harnesses the power of Jenkins 2.0 and can work with open source tools like Helm, Nexus, Docker Registry, etc to easily build cloud-native applications. In simple language, Jenkins X has a set of tools that simplify operations and automate CI/CD for Kubernetes. …

In plain and simple language, Helm is the package manager for Kubernetes. If we assume Kubernetes as an OS then Helm is Yum or apt. In Kubernetes, to install, uninstall, upgrade, update all tasks are performed using YAML manifests. Managing these YAMLs are a bit of pain. To manage these constant repeatable deployments, Helm creates a single package out of it. You can share this package, version it and manage it more easily compare to YAML. Helm has successfully simplified the process.

Introduction to Helm

Helm was created to emphasize configuration re-usability. It can help to maintain a life-cycle for Kubernetes-based deployment. …