T-Systems ICT India Devops Engineer Interview Questions and Answers

Control plane components in Kubernetes manage the cluster and make decisions about the state of the cluster.

• Control Manager: Ensures that the desired state of the cluster matches the actual state.

• Scheduler: Assigns workloads to nodes based on resource availability and constraints.

• API Server: Acts as the front-end for the Kubernetes control plane and is the primary interface for users and other components.

• etcd: Consiste...read more

Implementing zero-downtime deployments in Kubernetes involves using rolling updates and readiness probes.

• Use rolling updates to gradually replace old pods with new ones

• Configure readiness probes to ensure new pods are ready before routing traffic to them

• Utilize tools like Helm for managing releases and versioning

To ensure high availability of the etcd cluster used by Kubernetes, you can implement redundancy, monitoring, and disaster recovery strategies.

• Implement a multi-node etcd cluster to ensure redundancy and fault tolerance.

• Utilize monitoring tools like Prometheus and Grafana to track the health and performance of the etcd cluster.

• Set up regular backups and implement disaster recovery plans to quickly recover from failures...read more

Capacity planning for a Kubernetes cluster involves analyzing resource usage, predicting future needs, and scaling infrastructure accordingly.

• Monitor resource usage of pods and nodes using tools like Prometheus and Grafana

• Analyze historical data to identify trends and patterns in resource consumption

• Estimate future resource requirements based on application growth and workload changes

• Scale the cluster by adding or remo...read more

Roles in Ansible are a way to group tasks, handlers, variables, and other related files together for easier management and reuse.

• Roles help in organizing and structuring Ansible playbooks

• They promote reusability and modularity

• Roles can be shared and reused across different playbooks

• Each role typically consists of directories like tasks, handlers, templates, vars, etc.

• Roles can be installed using Ansible Galaxy

To give admin permissions to run a playbook, you can use sudo or grant specific permissions in the sudoers file.

• Grant sudo access to the user running the playbook

• Add the user to the sudoers file with specific permissions

• Use ansible_become to run tasks with elevated privileges

To add a plugin in Jenkins manually, you can download the plugin file and upload it through the Jenkins web interface.

• Download the desired plugin file from the Jenkins website or other sources.

• Navigate to the Jenkins dashboard and click on 'Manage Jenkins'.

• Select 'Manage Plugins' and go to the 'Advanced' tab.

• Choose the 'Upload Plugin' option and select the downloaded plugin file.

• Click 'Upload' and restart Jenkins to ap

Java program to reverse a string using StringBuilder

• Create a StringBuilder object with the input string

• Use the reverse() method of StringBuilder to reverse the string

• Convert the reversed StringBuilder object back to a string using toString()

Product release setup involves planning, coordinating, and executing the release of a software product to customers.

• Create a release plan outlining the scope, timeline, and resources needed for the release

• Coordinate with development, QA, and operations teams to ensure all necessary tasks are completed

• Use version control systems to manage code changes and track release versions

• Automate build, test, and deployment proces...read more

When SonarQube fails in Jenkins, the code quality analysis will not be performed and potential issues in the code will not be identified.

• SonarQube plugin in Jenkins will report a failure in the build job

• Developers will not receive feedback on code quality issues

• Quality gates will not be enforced, allowing potentially problematic code to be merged

• Manual code reviews may need to be conducted to ensure code quality

Managing dependencies, version control issues, inconsistent environments

• Dealing with conflicting dependencies causing build failures

• Ensuring consistent environment across development, testing, and production

• Resolving version control conflicts and ensuring code is up-to-date

• Handling build failures due to outdated or missing dependencies

• Managing build tools and configurations for different projects

Azure DevOps is a set of development tools used for planning, collaborating, and delivering software.

• Azure DevOps includes services such as Azure Boards, Azure Repos, Azure Pipelines, Azure Test Plans, and Azure Artifacts.

• It allows for continuous integration and continuous delivery (CI/CD) pipelines to automate the software delivery process.

• Azure DevOps provides a centralized platform for managing code repositories, tr...read more

DevOps is a software development approach that combines development and operations to improve collaboration and efficiency.

• DevOps aims to automate and streamline the software development lifecycle.

• It involves continuous integration, continuous delivery, and continuous deployment.

• DevOps promotes collaboration between development, operations, and other stakeholders.

• It emphasizes the use of infrastructure as code and conf...read more