The branch is defined by the variable towards the top of the whole script. I'd especially recommend that when you're first starting out. How to get a Docker container's IP address from the host. But now take a look at what's happening inside of the try block. Why? Do what makes the most sense for your shop. At least when it comes to deployments. Why the definition of bilinearity property is different in cryptography compared to mathematics? I'm also working on the same issue. Just copy and paste that URL into Repository URL field. It includes the Jenkinsfile and the Dockerfile. That way if something goes wrong, the finally block will run the junit command to publish unit test result reports. So to recap: there's a 1:1 relationship between repo and image. No duplicate tags in image builds. The Spring Boot application is also configured to listen on that port. Specifically, you'll need two sets of credentials: Go back to your Jenkins home page and once again click on that magical Manage Jenkins link on the left-hand sidebar. Making statements based on opinion; back them up with references or personal experience. I'll just cover the highlights. Let's now jump over into Docker Hub, and if we do a reload, you can see that the repository now exists. Well that's not how it should be. Okay, so, the complete pipeline has finished. I like to keep things consistent so the name of the pipeline is ecosystem-user-service. I want to be able to try and pull an image from docker/hub, and if it fails (because it hasn't been saved there yet) build it and push it to docker hub. It's the build ID from Jenkins. You don't need those premium services to continue with this guide, though. Assuming that's what you're using. But you don't need to be a Groovy expert to make something great happen in Jenkins. So here we are. It does that with the aid of docker.withRegistry. Jeremy is a Content Lead Architect and DevOps SME here at Cloud Academy where he specializes in developing DevOpstechnical training documentation. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It's way outside of the scope of this guide to get too deep into the weeds on what goes into a Dockerfile. In simple "steps" terms I think I want do do something like, but I also suspect I maybe need to do something like. How to fit many graphs neatly into a paper? If any of those tests fail, the build will end here and execution will transfer to the catch and finally blocks. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. And if this guide didn't answer all the questions you have, feel free to lobby the folks at Jenkins to come up with some decent documentation. That's a great way to learn. Setting build args for dockerfile agent using a Jenkins declarative pipeline. Build Agent - Scaling Out the Build Infrastructure, Docker Based Builds - Install and Configure, Blue Ocean - Build Package and Publish Docker Image to Docker Hub, Combining DevOps Tools at Scale - Jenkins, SonarQube, Artifactory, Splunk, and Jira, https://github.com/cloudacademy/jenkins-cicd-adv, https://www.jenkins.io/doc/book/pipeline/jenkinsfile/, https://www.jenkins.io/doc/book/blueocean/, https://www.jenkins.io/doc/book/architecting-for-scale/, https://www.linkedin.com/in/jeremycook123, Creating and configuring pipelines using a Jenkinsfile, Configuring Jenkins pipelines using the Blue Ocean interface, Defining build execution environments using docker containers, Setting up and scaling out Jenkins with multiple build agents and executors using SSH, Setting up build pipelines for Java-based projects using Gradle, How to scale out Jenkins using Master and Build Agent setups using SSH, The benefits of codifying pipeline build instructions using a Jenkinsfile, How to leverage Docker containers within a Jenkins pipeline to provide additional build isolation and flexibility, How to install and use the newer more modern pipeline centric BlueOcean user interface, How to integrate and leverage 3rd party build tools like Gradle, Maven, Yarn, Webpack, and many more within a Jenkins pipeline, A basic understanding of CICD, or Continuous Integration and Continuous Delivery, A basic understanding of software development and the software development life cycle, A basic understanding of version control and associated workflows. Meaning of 'glass that's with canary lined'? And then there are absolute abominations. You'll undoubtedly need to make some tweaks to suit your own requirements. The next stage ("Build JAR") unsurprisingly builds the JAR file for your Spring Boot application. There's typically one repo in GitHub per application. Then enter the URL for your source control repository. How to use jq to return information to the shell, taking whitespace into account? We click OK. We can close this tab now. But you'll need a Dockerfile to make that happen. Find centralized, trusted content and collaborate around the technologies you use most. Thanks for contributing an answer to Stack Overflow! If you don't have an account on Docker Hub, go through the process of getting one set up. I wish to pull Docker images from my Dockerhub repo and perform some tests with them. Then click Build Now on the left-hand sidebar. This is scripted and not declarative pipeline, which was not the request. When you click on Add Credentials, you'll see the following: If you're going the username/password route, you can leave the first field alone. Announcing the Stacks Editor Beta release! Once you've got Jenkins installed, it's time to add the necessary plugins. Just add /restart after your base Jenkins URL. And the Docker file will be used in the next stage within our pipeline to actually compile the Docker image. That's quite intentional and it's the pattern you should follow. Run command in Docker with declarative Jenkins Pipeline, Jenkins Declarative Pipeline with Mandatory stages. That's for starters. So our new build job is up and running. At this point the code has pulled down the source from GitHub, used that source to create a Spring Boot application JAR file, and generated a Docker image that will run that JAR file as an executable. So for me it's a best-practice to name the repo after the application. That's why you should put something very descriptive in that field. You can think of a repo in Docker Hub just like a repo in GitHub. He has a strong background in software engineering, and has been coding with various languages, frameworks, and systems for the past 25+ years. Oh, one other thing: Maven will also run all the unit tests in the source as part of the build process. Inrecent times, Jeremy has been focusedon DevOps, Cloud (AWS, GCP, Azure), Security,Kubernetes, and Machine Learning. Jenkins did its usual user-hostile thing and didn't make it easy for you to figure out how to create credentials. If it's not clear, you can see the name of each stage by looking inside the parentheses next to the word stage. Since you can more or less jump into a scripted pipeline with, How do I push and pull from docker hub in Jenkins declarative pipeline, San Francisco? Not the build number. That's suitable for running a Spring Boot application conpiled with JDK 11. We can see here that tomcat within our Docker image is now in a running state. I'd recommend you start at the Docker website if you're interested in learning more. We'll then tag the resulting image, and we tag it with the Jenkins build ID for the current job as well as with the latest tag. Then select Manage Credentials from the page that appears. Then click OK. Scroll down a bit on the new screen that appears until you get to the Pipeline section. From there, the rest of the fields are self-explanatory. Once the build launches, just click on the blinking blue (hopefully blue) circle below. rev2022.8.2.42721. And so, what we're doing here is that we're setting up the credentials that the pipeline will use to authenticate. For my Docker Hub credentials, I use "docker-hub" as the ID. This will then regenerate the Jenkins file, and commit it back to our repository. So here, we're instructing the build to go into the Docker directory. Inside the catch, the code reports the nature of the error and sets the build status to FAILURE. Under steps, we'll add another shell script, and we'll paste the following commands. Okay, back to Jenkins. That will push the image, tagged with the build number, to the repo. You can also grab the code I'm using from GitHub. In the Credentials dropdown, select the credentials that will work for your source repository. If you want some additional services, Docker Hub will set you back beteen $5 and $7 per month. It falls back to sorting by highest score if no posts are trending. That seems to be a best-practice for DevOps these days. Each image I build gets a new tag. The first stage ("Clone repository") grabs the latest source from source control. Once you've got the plugins, you're ready to get something set up on Docker Hub. For example, if your base Jenkins URL is http://myjenkins.com then go to http://myjenkins.com/restart to restart Jenkins. https://gist.github.com/jglick/0aa389c053196e38e2a1. And, finally, ENTRYPOINT configures the container to run as an executable. The second parameter ('docker-hub') identifies the credentials that Jenkins will use to access the Docker Hub repo. As we've seen, that's also the name of the Docker Hub repo and the GitHub repo. But also because the code needs a handle on the image when it invokes docker.build. Okay, let's jump back to our Jenkins pipeline, and we'll quickly summarize what we accomplished. We'll now add in a packaging stage. That will take you to console output that should end with something like this: That last word ("SUCCESS") is the most beautiful word in the English language to a DevOps engineer. So let's try it. The Docker image for the container (maven:3.6.3-jdk-11) is suitable for running Maven builds on Java source code compiled with JDK 11. Because scripted pipelines offer more flexibility. That's the ID of the credentials you created earlier. That will pull down the latest code for a specific branch from your GitHub repo and store it in your Jenkins working directory. (Warning: that documentation is from Jenkins so be sure to double-check everything you read there on StackOverflow). We perform a directory listing on the build/labs directory, and then, importantly, we copy the webapp.war file to the Docker directory. You'll get a confirmation prompt asking if you really want to restart. The sh command does exactly what you think it does: it executes a command in the container. But since this is a security issue I'm reluctant to give any recommendations on scope. Is any finite-dimensional algebra a sub-algebra of a finite-group algebra? This course introduces you toJenkins, a popular open-source tool used to performContinuous IntegrationandContinuous Delivery.We spend time early on reviewing the key Jenkins features and associated terminology. Then the code invokes docker.build. More like San Francis-go (Ep. And let me repeat: click on the circle. You'll see that in a moment. but I don't want to make any mistakes and screw a pipeline that is currently working fine except for this little bit. We'll select the build stage. Therefore, we should be good to go in terms of jumping back to our browser, starting a new browser tab, and this time browsing to localhost.8000/webapp/home. So within our pipeline, we performed a number of updates. The inside() function starts the Docker container and keeps it running for the duration of the body. Is the US allowed to execute a airstrike on Afghan soil after withdrawal? We'll do a Ctrl + L to clear the terminal. You should see a screen that looks like this: Start by entering the name of the pipeline. So we'll kick this off, and this will take a few minute to complete. So, in order for us to actually push up the image to our Docker Hub cloudacademydevops repository, we need the pipeline to authenticate to Docker Hub. Note that the code mounts a volume: -v /root/.m2:/root/.m2. Why would space traders pick up and offload their goods from an orbiting platform rather than direct to the planet? The url attribute is the base URL of the source tree. Now, we'll need to explain this.