deVops pathshala Blog – Notes for Me & You

🟢 Basic Level  General Concepts What is DevOps and why is it important? What is the difference between DevOps and Agile? Explain the DevOps lifecycle (Plan → Code → Build → Test → Release → Deploy → Operate → Monitor). What is CI/CD? How do they differ? What is the difference between Continuous Delivery and Continuous Deployment? Version Control What is Git? How is it different from SVN? What is the difference between git merge and git rebase ? What is a pull request / merge request? How do you resolve a merge conflict in Git? Linux/OS Basics What are inodes in Linux? How do you check disk usage in Linux? ( df , du ) What is the difference between a process and a thread? What does chmod 755 mean? How do you check running processes? ( ps , top , htop ) 🟡 Intermediate Level CI/CD & Automation What tools have you used for CI/CD? (Jenkins, GitHub Actions, GitLab CI, CircleCI) Explain a Jenkins pipeline. What is a Jenkinsfile ? What is the difference between a declarative...

  Introduction If you are preparing for a Linux Administrator job and the company is asking for 1 year of experience, then you must be prepared not only for basic questions but also for advanced real-time Linux interview questions. In this article, we have listed the most important advanced Linux interview questions that are commonly asked from candidates with 6 months to 1 year of experience. Section 1 – Advanced Linux Troubleshooting Questions How will you troubleshoot if a Linux server is not booting? What will you do if the system enters emergency mode? How will you reset the root password in Linux? How will you troubleshoot a slow Linux server? The system is hanging but memory looks free. What could be the issue? Section 2 – Advanced Process Management Questions How do you identify high CPU usage in a production server? What will you do if a process is not getting killed? What is a zombie process and how do you fix it? What is the real production use of nice and renice...

  Subscribe YouTube Channel @devops-pathshal a   1. What is Docker ? Ans:- Docker is a platform that allows you to package an application and all its dependencies into lightweight portable containers. 2. What are Containers ? Ans:- Containers are lightweight, isolated environment that package an application along with all dependencies so it run consistently on any system. 3. What is the difference between a container and a Virtual Machine ? Ans:- Containers are lightweight because they share the host operating system, while virtual machine are heavy because they run their own full operating system. Containers start very quickly, use fewer resources and are ideal for microservices. Virtual machines provide stronger isolation but require more RAM and CPU since each VM containers a full OS. So overall, containers are fast and efficient, whereas VMs are heavier but more isolated. 4. What are docker engine ? Ans:- Docker Engine is the core component of  Docker that runs and ma...

  Subscribe YouTube Channel @devops-pathshala                                               Docker Networking  Docker networking is the way Docker containers communicate with each other, with the host system, and with the outside world (like the internet). Since containers are isolated by default, networking allows them to exchange data and services in a controlled and flexible manner. 1. Why Docker Networking is Needed Each container has its own isolated environment, including its own network stack. To allow communication between: Containers on the same host Containers across different hosts Containers and the external world (internet) Networking also allows services to be exposed securely to the outside. 2. Types of Docker Networks Docker provides several built-in network types: Network Type Description Use Case Bridge Default network for ...

                                                                    Docker Image Management  A docker image is a read only blue print used to create containers. It contains the application code, dependencies and environment required to run the containers.                                              Image vs Container  Feature Docker Image Docker Container Definition Read-only template used to create containers  Running instance of a Docker image State Static (does not change) Dynamic (changes during runtime) Purpose Used to build containers Used to run applications Mutability Immutable (cannot be modified) Mutable (can be modified) Storage Stored on disk Runs in memory + disk Creation Creat...

  What is Docker ? Docker is a platform that allows you to package an application and all its dependencies into lightweight, portable containers. Why use Docker ? Docker simplifies application deployment by packaging everything into lightweight portable containers. What is the difference between a container and a VM(Virtual Machine)? Containers are lightweight because they share the host operating system , while Virtual machines are heavy because they run their own full Operating System. Containers start very quickly , use fewer resources and are ideal for microservices . Virtual machines are provide stronger isolation but require more Ram and CPU since each VM containers a full OS. So overall, containers are fast and efficient , whereas VMs are heavier but more isolated. What is Container ? Containers are lightweight, isolated environments that package an application along with all its dependencies so it run consistently on any system. They share the Host OS kernel , so they ar...

  🟢 Basic Kubernetes Interview Questions What is Kubernetes? Why do we use Kubernetes? Difference between Docker and Kubernetes? What is a Pod in Kubernetes? What is a Node in Kubernetes? What is a Namespace? What is a Deployment in Kubernetes? What is a Service in Kubernetes? Types of Services in Kubernetes? What is a Kubelet? What is a Kubernetes Master Node? What are Labels and Selectors? What is ReplicaSet? What is the difference between ReplicaSet and Deployment? What is kubectl? (common commands) What are ConfigMaps? What are Secrets? Difference between Secret and ConfigMap? What is ETCD? What is Scheduler? What is Container Runtime in Kubernetes? 🟡 Intermediate Kubernetes Questions Difference between NodePort, ClusterIP, LoadBalancer? What is Ingress and Ingress Controller? What is Horizontal Pod Autoscaler (HPA)? What are taints and tolerations? What is Node Affinity vs Pod Affinity? What is DaemonSet? What is StatefulSet? Difference between StatefulSet and Deployment? Wh...