Top 100 Devops Interview Questions with Answers | [ Stackoverflow]

Question: Docker container will automatically stop after "docker run -d"?

I've seen a bunch of tutorials that seem do the same thing I'm trying to do, but for some reason my Docker containers exit. Basically, I'm setting up a web-server and a few daemons inside a Docker ...

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Question: My docker container has no internet?

I'm trying to find an elegant solution to something which should be really simple. I am working on a React app using create-react-app and I'm trying to find an easy way to substitute variables (eg. ...

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Question: How to keep Docker container running after starting services??

I am running docker container for my development stack which I pulled from docker-hub, the image is created for a different timezone than where my application is supposed to be deployed. How do I ...

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Question: How to use variable substitution in Frontend js applications like backend applications??

I try to build an Angular 5 application with the standard ng build --prod command, and I want to set the basic API-Url in the environment.prod.ts to a value dependent on my process.env variables. ...

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Question: How do I change timezone in a docker container??

I'm trying to run a batchscript present inside the workspace of jenkins. I have written a groovy script as below to do this stage('batchscript') { steps{ bat 'start cmd.exe /c C:\\Program ...

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Question: Use process.env in Angular 5 environment?

I'm using helm chart to deploy my application on kubernetes. But services that I'm using in my stack depends on other services how do I make sure helm will not deploy until the dependencies are up?

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Question: why am I not able to run batch file in jenkins pipeline running in windows 10??

I want to upload .pfx certificate for my app service through azure devops task. can some one please help me on how to upload certificate through ARM Template

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Question: Helm wait till dependency deployment are ready on kubernetes?

In Azure DevOps, I created a Build. In that Build I created a ProjectBuildNumber Pipeline variable that is Settable at queue time. That variable is then used under Options -> Build number format to ...

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Question: upload .pfx certificate through azure devops pipeline?

Below playbook use conditional statement with operators in Ansible. When I run the playbook, it never takes/validates the condition instead it consider the last set_fact value for "shmall". --- - ...

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Question: Azure DevOps Set Build number variable in a Build Task?

I have a docker-compose file running a few Dockerfiles to create my containers. I don't want to edit my Dockerfiles to set timezones because they could change at any time by members of my team and I ...

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Question: "When" condition on Ansible playbook doesn't work as expected using operators?

This is our environment: I have a Kubernetes cluster running on Amazon. Jenkins CI/CD running on Amazon that connects to a private GitLab and builds our services as Docker images. Amazon ECR that ...

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Question: Using docker-compose to set containers timezones?

When trying to enter into Docker VM in mac, I am getting screen is terminating error whereby I cannot go into Docker Desktop. In Mac, Docker host is not the mac as it runs as a VM. Any solutions? ...

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Question: How to auto deploy Docker containers from Amazon ECR to Kubernetes using Jenkins?

I'm using Jenkins together with the Bitbucket branch source plugin. Everything works great, but I want to be able to run/exclude certain stages in my pipeline depending on whether the branch is ...

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Question: Why I am getting Screen is terminating error in MacOS?

In my azure release pipeline I have 2 agent jobs, one is for sql deployment using power-shell and other is for kubernetes using power-shell. How to set an output variable in 1st agent job and use that ...

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Question: Jenkins pipeline determine if a branch is for Bitbucket pull request?

I Build a simple NodeJS API, pushed the Docker Image to a repo and deployed it to my k8s with Helm install (works perfectly fine). The pullPolicy is Always. Now I want to update the source code and ...

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Question: How to use output variables across agent jobs in azure release pipeline?

I'm new to Kubernetes, I tried to apply yaml file to create Postgres in GKE, I'm getting error as "Error: failed to start container "postgres": Error response from daemon: error while ...

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Question: Helm upgrade doesn't pull new container?

I have data that is represented in this manner: { "key1": [{ "name": "some name1", "index": "some idx1" }, { "name": "some name2", "index": "some idx2" }, ...

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Question: mkdir /mnt/data: read-only file system Back-off restarting failed postgres container?

Is there any simple way to work with APIs or with scripting to get list of all builds performed on all jobs for last one year along with the user who triggered the build as a report?

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Question: Flattening and filtering a complex structure in ansible - dict of list of dict?

I am trying to make 2 services communicate over service discovery endpoint in AWS ECS service. Example: Service1: runs the Task Definition to run nginx and phpfpm Service2: runs the Task Definition ...

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Question: List Jenkins job build detials for last one year along with the user who triggered the build?

I have an infrastructure I'm deploying using Terraform in AWS. This infrastructure can be deployed to different environments, for which I'm using workspaces. Most of the components in the deployment ...

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Question: Not able to make AWS ECS services communicate over service discovery?

I have an application on GKE that I wish to be available via HTTPS only, so I have gotten a signed certificate to secure the application using TLS. I have checked out a lot of tutorials on how I can ...

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Question: Sharing resources between Terraform workspaces?

In order to automate our deployments, I would like to rebuild an application, based on a given ChangeSetId. Once this build has completed, I want to get the artifacts of the build (the .exe), so we ...

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Question: Google Kubernetes Engine: Enable HTTPS for Service type?

version: '2' services: web: build: context: ./ dockerfile: deploy/web.docker volumes: - ./:/var/www ports: - "8080:80&...

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Question: Start vNext build from Powershell and get artifacts?

I am a beginner to Kubernetes and starting off with this tutorial. I installed VM and expected to be able to start a cluster by using the command: minikube start But I get the error: Starting ...

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Question: How can I change permission of mounted volumes in docker-compose.yml from the docker-compose.yml??

Updated 20-Feb-2020 Summary Azure DevOps pipeline build not able to find NuGet package from our private feed under Artifacts. Our Azure DevOps environment In Azure, we have our company "space": ...

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Question: How to fix VM issue with minikube start ??

I am using the Azure Pipelines GitHub add-on to ensure that pull requests pass my linting. However, I have just made a test pull request which fails my linting, but the Azure Pipeline succeeds. Here ...

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Question: Azure DevOps Project pipeline not able to access NuGet package from Artifact Feed in different Project?

I would like to be able to add a public key for SSH access to Azure DevOps via the API but I can't seem to find a way to do it in the doco. Doing it manually via the UI is not feasible since this is ...

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Question: How do I get my Azure DevOps Pipeline build to fail when my linting script returns an error??

I am trying to start a local Kubernetes cluster using minikube start and getting the following error. Starting local Kubernetes v1.10.0 cluster... Starting VM... Getting VM IP address... Moving files ...

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Question: Azure DevOps API Add public key?

I've recently started using lerna to manage a monorepo, and in development it works fine. Lerna creates symlinks between my various packages, and so tools like 'tsc --watch' or nodemon work fine for ...

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Question: Error restarting cluster: restarting kube-proxy: waiting for kube-proxy to be up for configmap update: timed out waiting for the condition?

I am trying to setup ALB load balancer instead of default ELB loadbalancer in Kubernetes AWS.The loadbalancer has to be connected to the istio ingressgateway.I looked for solutions and only found one. ...

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Question: Should a developer be able to create a docker artifact from a lerna monorepo in their development environment??

I am always getting an error on npm install after setting NPM Authenticate. I would like to authenticate to my npm private registry during image build and install all the dependencies I need. Maybe I ...

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Question: How to set AWS ALB instead of ELB in Istio??

Right now my NuGet restore fails since the project build user doesn't have contributor access to the package feed. /usr/share/dotnet/sdk/3.0.100/NuGet.targets(123,5): error : Unable to load the ...

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Question: Azure Devops: Cannot Build an Image using NPM private registry even after setting NPM Authenticate?

I have a yaml pipeline that builds and deploys a project. it deploys to dev & tst. But i dont always want to deploy to tst. at the moment i have solved this with approvals. when the dev stage ...

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Question: How do I set the build authorization scope for my project??

curl -X POST http://xxx.yyy.zzz:5555/job/job-name/build --user john-devops-jenkins:11df3ed41129c5c7da1518e9c3149896de -H 'Jenkins-Crumb:31827a74a160347a641c87ddbc8e3b6e' The above curl code with a ...

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Question: Azure devops optional stage?

Why is the TFS Rest API for fetching the TFVC changesets returning only 256 items. I tried using the $Top to get more than 256 results. But no use. The API for getting Git repository commits is ...

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Question: How to pass crumb info via bitbucket-hook to jenkins??

I am trying create a bunch of pods, services and deployment using Kubernetes, but keep hitting the following errors when I run the kubectl describe command. for "POD" with RunContainerError: "...

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Question: Why is TFS Rest API for fetching the TFVC changesets returning only 256 items??

I am trying to connect my SonarQube installation to JIRA 7.0.2 for issue linking. I have filled the configuration fields (Files attached), but I get the error, impossible to connect to JIRA server. ...

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Question: Kubernetes can't start due to too many open files in system?

I wanted to give a try to vault, so I configured VAULT_ADDR as: $ echo $VAULT_ADDR http://127.0.0.1:8200 then I started vault in dev mode (vault server -dev) and everything was ok, I was able to ...

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Question: SonarQube cannot connect to JIRA 7 with REST API?

We have an application which uses JSON file to define the the connection strings and credentials of the databases and other APIs. Ideally those credentials are added as variable into the bitbucket ...

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Question: How to connect to Vault server?

I have my AWS lambda, lets call it Lambda-X. There are other lambdas, I don't know their names, that consumes my Lambda-X via API call. How do I determine the names/ip/identifier of lambdas that ...

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Question: How to avoid credentials push to bitbucket via the developers??

I would like to download an application from azure devops repository via command line (like using powershell) peridiocally but i can not use git plugin for that. IS there any way besides git to do ...

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Question: Checking what consumes AWS lambda?

I've got an AWS CloudFormation template that creates an SNS topic and a subscription: "AcceptedTopic":{ "Type": "AWS::SNS::Topic", "Properties": { "DisplayName"...

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Question: Download an application from Azure Devops via command line?

I searched all the docs about Output Variables are for build pipeline and only told me how to set in .yaml. But how to use it in release pipeline? Supposed I have 2 variables $abc="123" $def="456" ...

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Question: Howto specify 'Raw Message Delivery' for an SNS subscription using AWS CloudFormation??

When I go to create an RDS database, the db.t2.micro database is not showing up for PostgreSQL. I have the "Include previous generation classes" box checked. The instance type is showing ...

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Question: How to use Output Variables in Release pipeline?

I'm trying to set up a web app that has persistent storage via file share to a storage account. I'm following various guides from Microsoft docs and I managed to do most of it, my app has persisted ...

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Question: Amazon RDS free tier database not showing up for PostgreSQL?

I am using the release pipeline classic editor and have a requirement of passing an output variable generated in a task to multiple jobs in the same stage or to outside stages. Currently, this output ...

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Question: Azure Web App usage of WEBAPP_STORAGE_HOME variable in docker-compose?

We're starting to use Azure DevOps to build and deploy my application. Currently, we do not upload the application images to our repo. I Would like to know if I could download all the images to the ...

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Question: Pass Azure devops release pipeline(Classic editor) output variable to multiple jobs in same stage or to multiple stages outside?

I’m fairly new to implementing CI/CD through Azure DevOps and I have what is probably a typical scenario that I’m not sure how to address. Most of the articles I’ve found dealing with file ...

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Question: Pass Azure devops release pipeline(Classic editor) output variable to multiple jobs in same stage or to multiple stages outside?

I have a CI pipeline setup using Github Action/Workflows, where i would want to run Cypress Automated tests, However I am having some logical problems of how to run my dev server. let me show you my ...

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Question: How to install .net Framework in docker??

Created Kubernetes cluster deployment with 3 Pods, and all are running fine, but when trying to run them cannot do it, tried doing curl the Ip (Internal)of the Pods in describe section i could see ...

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Question: Run a dev server in CI pipleine?

I want to deploy war file using pipeline. What is the correct way to do it . Is there any way to use Deploy to container in pipeline code. The problem with calling catalina.sh or using curl command to ...

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Question: Pods starting but not working in Kubernetes?

I'm using NUnit.Framework to test my .NET Framework project. I want to run my tests via GitHub Actions. Yml file: build: runs-on: windows-latest steps: - uses: actions/checkout@v2 - name: Setup .NET ...

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Question: How to deploy war to tomcat using jenkins pipeline??

How do I restore kubernetes cluster using kops? I've kubernetes state files in my s3 bucket. Is there a way to restore kubernetes cluster using kops?

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Question: Run Nunit Test in Git Actions for .Net Framework?

I am trying to deploy a complete web application using GKE on Google Cloud (backend as nodejs, and frontend angular). Then enable SSL for it afterward. I created a global IP address (And saw it in the ...

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Question: How to restore kubernetes cluster using kops??

I'm working with cloud foundry. My need is to run a database migration aside from my application so that I can trigger the migration in some way (cf command, api call, etc) when I need. I was ...

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Question: Google Cloud Kubernetes Ingress Static IP address not reflected and different from setup?

I am facing a issue related to Docker users. I run my container as gitlab-runner using the following command: docker run --name testes_cashlink --hostname testes_cashlink --user gitlab-runner --...

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Question: Does cf run-task need env/script uploaded befrore running? An elegant way??

I am trying to implement a powerBI deployment pipeline . I already have workspaces created for each environment (Dev, test, prod). But while creating deployment pipeline, I can only assign one ...

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Question: Different file owner inside Docker container and in host machine?

A build definition in Azure DevOps generates a .ipa file(iOS app file). I want to push this .ipa file generated by Azure DevOps build, directly into a remote GitHub Repository.

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Question: How to deploy to existing powerBI workspace??

Ansible: - name: Node package manager npm: name: pm2 global: yes notify: - restart nginx - name: start the app script: ../files/common/pm2.sh app_name {{ user ...

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Question: Commit a file to remote github repo through Azure DevOps?

I am pretty new to Development community and specifically to DevOps practices , as a part of project we are trying to integrate SonarQube with Gitlab , did some R& D on SonarQube and Git CI ( ...

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Question: Ansible inside script command not found?

I am trying to download java using yum on centOs which I specified in Dockerfile. After pulling centOs image the run crushed and throw this error!? also to mention that my server instance is AWS EC2! ...

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Question: Gitlab integration with SonarQube?

I have recently observed a very weird merge conflict in Subversion. I am using tortoise SVN as the client. Please find the below information of the Trunk and branch details: \trunk\ . Two users are ...

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Question: Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist?

I think I'm fundamentally missing something. I'm new to CI/CD and trying to set up my first pipeline ever with gitlab. The project is a pre-existing PHP project. I don't want to clean it up just yet,...

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Question: conflicts prevention while merging branches in Subversion?

I want to add a volume to my service, but only if the final user gave a folder for it. Otherwise, no volume should be mounted, for the already-prepared image has valid data in a default folder. That ...

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Question: What is gitlab runner?

It keeps saying me that this network is undefined. ERROR: Service frontend-network uses an undefined network frontend-network However, I see that there is such network with docker network ls. What am ...

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Question: Docker-compose, conditional statements? (e.g. add volume only if condition)?

Whenever I start AWS CodeBuild I get this type of error every time. please help. DOWNLOAD_SOURCE Failed 3 mins, 2 secs Get https://github.com/themithunbiswas/test-...

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Question: ERROR: Service "xxx" uses an undefined network "xxx"?

Running docker toolbox ( v19.03.1) from Windows 10 Home edition yields the following error message: Running pre-create checks... Error with pre-create check: 'This computer doesn't have VT-X/AMD-v ...

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Question: DOWNLOAD_SOURCE Failed AWS CodeBuild?

Newbie in this area. I have installed the new version of Docker in my windows PC. I am using windows 10 Pro. I have tried the very basic docker command but it is not working. I have also run the ...

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Question: Error with pre-create check: 'This computer doesn't have VT-X/AMD-v enabled. Enabling it in the BIOS is mandatory' even though it's enabled?

How Log stash is different than Kafka? and if both are same which is better? and How? I found both are the pipelines where one can push the data for further processing.

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Question: Docker daemon is not running?

I am trying to deploy a configmap onto a cluster - name: Make/Update all configmaps on the cluster kubernetes: api_endpoint: blah url_username: blah url_password: blah inline_data: apiVersion: ...

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Question: How Logstash is different than Kafka?

I want to containerise a pipeline of code that was predominantly developed in Python but has a dependency on a model that was trained in R. There are some additional dependencies on the requirements ...

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Question: kubernetes configmap prints \n instead of a newline?

I am successfully able to connect to remote machine using SSH but when I am launching the agent from Jenkins it throws the following error: ERROR: Server rejected the 1 private key(s) for user1 (...

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Question: How can I create a Docker image to run both Python and R??

After successfully deploying our app to a Virtual Machine using Edeliver & Distillery using these steps: https://github.com/dwyl/learn-phoenix-framework/blob/master/production-deployment.md The ...

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Question: Why Jenkins says "Server rejected the 1 private key(s)" while launching the agent??

I am trying to do a poc of jenkins pipeline as code. I am using the Github organization folder plugin to scan Github orgs and create jobs per branch. Is there a way to explicitly define the names for ...

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Question: How to View Production Logs in Phoenix Web Application Deployed using Edeliver??

GitLab CI allows adding custom variables to a project. It allows to use a secret variable of type file where I specify a Key that is the variable name and Value that is the content of a file(e.g. ...

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Question: Set the pipeline name and description from Jenkinsfile?

The app I'm making is written in ES6 and other goodies is transpiled by webpack inside a Docker container. At the moment everything works from creating the inner directory, installing dependencies, ...

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Question: How to pass GitLab CI file variable to Dockerfile and docker container??

It seems like I can use either user_data with a template file or a "remote-exec" provisioner with inline commands to bootstrap. So which one is considered more idiomatic?

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Question: How do I run a webpack build from a docker container??

I have set up several multi-staged build pipelines in Azure DevOps by using .yaml files. I've read about the "Release Pipelines" available, and I'm wondering what the benefits of those are? They ...

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Question: Terraform - should I use user_data or provisioner to bootstrap a resource??

I've got the following pipeline but I don't know why it fails on the first line of code: pipeline { agent any environment { def mypods = [] } stages { stage('Getting ...

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Question: Whats the difference between a build pipeline and a release pipeline in Azure DevOps??

Here is my service.yaml code : kind: Service apiVersion: v1 metadata: name: login spec: selector: app: login ports: - protocol: TCP name: http port: 5555 targetPort: login-...

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Question: Storing list of values in the environment variable in declarative Jenkins pipeline?

I try to make a pretty basic GitLab CI job. I want: When I push to develop, gitlab builds docker image with tag "develop" When I push to main, gitlab checks that current commit has tag, and ...

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Question: Kubernetes cluster is not exposing external ip as ?

Suppose you have two services on your topology API Web Interface Both suppose to be running on port 80. On docker swarm when you create a service if you wanna to access it outside the cluster you ...

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Question: $CI_COMMIT_TAG in "if" statemets of regular job?

tl;dr How do I pass data, e.g. the $BUILD_VERSION variable, between jobs in different pipelines in Gitlab CI? So (in my case) this: Pipeline 1 on push ect. Pipeline 2 after merge `...

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Question: docker swarm mode multiple services same port?

I am trying to detect the branch pattern on a when statement inside a stage. Like this: stage('deploy to staging') { agent label:'some-node' when { branch "feature/*" } steps { sh './deploy_pr....

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Question: Gitlab CI/CD Pass artifacts/variables between pipelines?

We are a few developers currently developing a C++ app. In order to be sure that everyone use the same libraries and dependencies than the remote production server, we are using docker to compile the ...

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Question: What's the pattern evaluation on Jenkinsfile when-branch setting??

I have a private repository. I want to update my image on Kubernetes automatically when the image is updated on this private repository. How can I achieve this?

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Question: Dockerfile versioning best practice?

The situation I have a kubernetes pod stuck in "Terminating" state that resists pod deletions NAME READY STATUS RESTARTS AGE ... funny-turtle-myservice-xxx-yyy ...

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Question: Auto Update Container Image When New Build Released on Kubernetes?

I am trying to build a simple docker console project at azure DevOps pipeline, but i am unable to build the project. When i try to copy the code i get this error: invalid from flag value build: ...

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Question: "Ghost" kubernetes pod stuck in terminating?

I want to change release names like V.1.0.00 for manual release in Continuous Delivery of Azure DevOps but i can't able to delete or change the naming without this $(rev:r), how can I use a custom ...

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Question: invalid from flag value build: pull access denied for build, repository does not exist or may require 'docker login'?

I am learning Ansible but I am getting confused when to use hyphen and when not to use hyphen in playbook. As I know, hyphen is used for list in Ansible. For example, --- # my first playbook - ...

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Question: How to change custom release names in Azure DevOps??

When Terraform run task executes in azure devops release pipeline I get an error "A resource with the ID already exists". The resource exists in Azure but why it is complaining about the resource if ...

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Question: Using hyphen in ansible?

I recently was able to get my Laravel app deployed using codepipeline on Elastic Beanstalk but ran into a problem. I noticed that my routes where failing because of php.conf Nginx configuration. I had ...

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Question: Terraform resource with the ID already exists?

I am setting up an Azure DevOps pipeline for an ASP.NET Core 3.1 Application and I have the following YAML definition test segment) for building, testing and code coverage. - task: ...

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Question: Elastic BeanStalk app deploy post hook not executing my command?

I'm setting up Gitlab CI docker-in-docker for a project. Unfortunately the job keeps failing because installed NPM packages can't seem to be found when running commands. The error I'm getting: ...

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Question: Azure DevOps Code Coverage for .NET Core 3.1?

Using helm for deploying chart on my Kubernetes cluster, since one day, I can't deploy a new one or upgrading one existed. Indeed, each time I am using helm I have an error message telling me that it ...

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Question: How to fix 'sh: tsc not found' error in docker container when using Gitlab CI docker-in-docker?

I am trying to pull the code form GIT using GIT Plugin Jenkins and the job is running on a slave machine. MASTER system has http_proxy=mycom.domain.com:80 and in SLAVE system there is no http_proxy ...

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