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DevOps Interview Questions

Questions from GIT, Jenkins, Ansible, Dockers & Containers, Kubernetes, OpenShift, AWS, CI/CD, Scripting, Linux (RHEL), Monitoring, Python GIT ########### * What is GIT ? * What is difference between GIT & Github ? * Why we use GIT ? * What is SCM & VCS ? * What are the process of pushing the code to Github Repository ? * Why do we commit ? * What are the commands of GIT to push the code ? * How you can merge a git repository with another ?  * What is branching in git ? * Different types of branching in GIT ? * What is merge conflict in git ? * How you can resolve merge conflict if you are merging same    project and in the same branch ?    Jenkins ########## * What is Jenkins ? * Why we use Jenkins ? * What are the other tools/technologies present in market other than    Jenkins for CI/CD ? * How to move Jenkins from one server to another ?    * How to create Jenkins backup ?  * What are plugins in Jenkins ? * What are

CKAD Certification Exam Preparation Guide and Tips

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Kubernetes is an open-source system for automating deployment, scaling, and management of containerized applications. The CNCF/Linux Foundation offers this performance-based exam which targets the developer aspect of Kubernetes skills such as deploying apps, configuring apps, rolling out the application, creating persistent volumes, etc. CKAD (Certified Kubernetes Application Developer) is designed for software developers who would like to develop and deploy their containerized applications in Kubernetes. The curriculum includes the following general domains with the associated weights: Core Concepts – 13% Configuration – 18% Multi-Container Pods – 10% Observability – 18% Pod Design – 20% Services & Networking – 13% State Persistence – 8% ------------------------------------------------------------------------- After my successful achievement of CKAD Certification, I would love to share my experience and tips to clear the exam. I have  practiced a lot on kubectl  commands and

Install Broadcom Wireless BCM43142 Driver on Red Hat Enterprise Linux

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Build and install kmod-wl for Broadcom Wireless Adapter Driver Check your Wireless network adapter details ##################################### [root@localhost ~]# lspci 00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09) 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) 00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09) 00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03) 00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03) 00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03) 00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3) 00:1c.1 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #2 (rev e3) 00:1c.2 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #3 (rev e3) 00:1c.3 PCI bridge: Intel Corp

Continuous Integration and Continuous Deployment

The key to success with CI/CD is to automate and monitor as much as you can practically. A well-tuned CI/CD pipeline will help your organization quickly deliver quality code to your customers. Continuous Integration Continuous Integration is a development practice that ensures your application is always in a “good” state. This means that anything in your master or pre-production branch is in working order and never stays broken for long. CI is all about taking the code written by developers and compiling it into an artifact, running automated tests, and capturing the log files so any failed builds or tests can be resolved. A CI server facilities this process by running builds and tests with each commit. The CI process can be described as : code + dependencies + build tools + execution environment = test results + logs + compiled artifact The left side of the equation takes the code written by developers, any dependencies of the code, a build tool, and the environment where

Getting started with Helm on Kubernetes

Deploying applications to Kubernetes – the powerful and popular container-orchestration system – can be complex. Setting up a single application can involve creating multiple interdependent Kubernetes resources – such as pods, services, deployments, and replicasets – each requiring you to write a detailed YAML manifest file. Helm is a package manager for Kubernetes that allows developers and operators to more easily package, configure, and deploy applications and services onto Kubernetes clusters. Helm is the first application package manager running atop Kubernetes. It allows describing the application structure through convenient helm-charts and managing it with simple commands. Why is Helm  important?   Because it’s a huge shift in the way the server-side applications are defined, stored and managed. Adoption of Helm might well be the key to mass adoption of microservices, as using this package manager simplifies their management greatly. Helm charts are built atop K