In this tutorial" I will show you how to trigger another pipeline from current job. In other words we can say: Jenkins" run seed job. You have probably encountered the situation that you wanted to run another Jenkins" job from the current pipeline. It’s very easy to achieve it! We will go step by step through the stages of the work phase, its recovery and check the logs.
Last time I wanted to run the E2E tests pipeline in Jenkins" after each commit to develop branch with condition if the current pipeline will finish with success. That’s our task for this post.
Table of Contents
Introduction
Jenkins
Jenkins" is an open-source automation server that is used to automate parts of the software development process. It is a popular tool for continuous integration and delivery, allowing developers to automate the build, test, and deployment of their applications.
With Jenkins", you can create a pipeline of tasks that are automatically triggered based on certain events, such as code commits or the completion of a test suite. Jenkins" can also be configured to send notifications about the status of the pipeline, so that you can stay informed about the progress of your builds and deployments.
To use Jenkins", you will need to install it on a server and set up a pipeline for your project. This typically involves creating a configuration file that defines the steps in the pipeline and specifying the triggers that will cause the pipeline to be executed. Jenkins" provides a web-based user" interface that allows you to view the status of your pipelines, as well as configure and manage your builds and deployments.
Jenkins" is a powerful and flexible tool that is widely used in the software development industry. It can be used to automate a wide range of tasks, including building, testing, and deploying applications, as well as performing other types of automation.
What Is The Seed Job?
The seed job is the normal job, but it’s executed from another job as a child process, which from executor side is treat as normal execution of another job.
Trigger Another Pipeline From Current Job
You can trigger another pipeline from the current job in Jenkins" by using the build
step in the pipeline script. This step allows you to specify the name of the job that you want to trigger, as well as any parameters that you want to pass to the triggered job.
Here’s an example of how you might use the build
step to trigger another pipeline from the current job:
pipeline { stages { stage('Trigger Other Pipeline') { steps { build job: 'other-pipeline', parameters: [ string(name: 'param1', value: 'value1'), string(name: 'param2', value: 'value2') ] } } } }
In this example, the build
step will trigger the pipeline job named “other-pipeline”, and pass it two string parameters named “param1” and “param2” with the specified values.
You can also use the build
step to trigger a job that is not a pipeline job. In this case, the triggered job will be executed as a standalone build, rather than as part of a pipeline.
Keep in mind that the build
step will block the execution of the current pipeline until the triggered job has completed. If you want to trigger a job asynchronously and continue with the execution of the current pipeline, you can use the trigger
step instead of the build
step.
You probably have installed Jenkins" or have access to Jenkins" instance. I case if you don’t have I am referring you to the post Jenkins" & Nexus" & SonarQube": Build the DevOps environment using Docker-Compose".
You can easily isolate the Jenkins removing Nexus" and Sonar services from docker-compose".yml file and stay only with Jenkins" service.
Two Pipelines
We will build two pipelines. The first job will be started manually, while the second one will be started automatically from the first one:
- “Build_pipeline” – to build, test and upload to nexus" repository our project and etc.
- “E2E_tests_pipeline” – to run our tests
Additionally we will pass parameter from first pipeline to second one. At the end of post I will show you the rest of out-of-the box functions like:
- Wait for completion
- Propagate errors
- Quiet period
E2E_test_pipeline
We will start from the end. Firstly create E2E_test_pipeline and add one String parameter like in the picture below:
![[SOLVED] Jenkins: How To Trigger Another Pipeline From Current Job? - 1 Cool Secret To Do It! 2 [SOLVED] Jenkins: How To Trigger Another Pipeline From Current Job? - 1 Cool Secret To Do It!](https://bigdata-etl.com/wp-content/uploads/2020/03/Screenshot-from-2020-03-09-22-56-21.png)
In the section of pipeline script please put the below code:
pipeline { agent any stages { stage('E2E Tests') { steps { echo "Running E2E tests..." echo "MY_PARAM=${env.MY_PARAM}" } } } }
Build Pipeline
Now we will build our main pipeline which will trigger the e2e tests.
Jenkins Trigger Another Job If Success
Note that the next job will only be triggered if the basic job is successful. You can take advantage of many other post conditions that Jenkins" out of the box gives us, like:
always
changed
aborted
failure
success
unstable
unsuccessful
cleanup
fixed
regression
See the full list with description on official Jenkins site.
pipeline { agent any stages { stage('Build') { steps { echo "Build step" } } stage('Test') { steps { echo "Test step" } } stage('Upload artifacts') { steps { echo "Upload artifacts step" } } } post { success { echo 'Run E2E Test pipeline!' build job: 'E2E_tests_pipeline', parameters: [string(name: 'MY_PARAM', value: 'value from Build pipeline')] } } }
Jenkins Run Seed Job – Run Pipeline
Now we are ready to run the Build pipeline and check if we achieved what we wanted 🙂
As you can see and screenshots below the first pipeline was run and at the end in Post Actions we triggered e2e tests.
![[SOLVED] Jenkins: How To Trigger Another Pipeline From Current Job? - 1 Cool Secret To Do It! 3 Jenkins: How to trigger another pipeline from current job? - e2e easy example!](https://bigdata-etl.com/wp-content/uploads/2020/03/Screenshot-from-2020-03-09-23-04-35-1-1024x589.png)
And check the E2E_tests_pipeline in another tab.
![[SOLVED] Jenkins: How To Trigger Another Pipeline From Current Job? - 1 Cool Secret To Do It! 4 Jenkins: How to trigger another pipeline from current job? - e2e easy example!](https://bigdata-etl.com/wp-content/uploads/2020/03/Screenshot-from-2020-03-09-23-04-48-1.png)
Console logs
Let’s check the logs of job executions. Here we can see how the pipeline went through steps. To emphasize the separation I have added the echo command in each step. Please find the special-lines which I marked in the logs which indicates that job was triggered by another pipeline.
Started by user admin Running in Durability level: MAX_SURVIVABILITY [Pipeline] Start of Pipeline [Pipeline] node Running on Jenkins in /var/jenkins_home/workspace/Build_pipeline [Pipeline] { [Pipeline] stage [Pipeline] { (Build) [Pipeline] echo Build step [Pipeline] } [Pipeline] // stage [Pipeline] stage [Pipeline] { (Test) [Pipeline] echo Test step [Pipeline] } [Pipeline] // stage [Pipeline] stage [Pipeline] { (Upload artifacts) [Pipeline] echo Upload artifacts step [Pipeline] } [Pipeline] // stage [Pipeline] stage [Pipeline] { (Declarative: Post Actions) [Pipeline] echo Run E2E Test pipeline! [Pipeline] build (Building E2E_tests_pipeline) Scheduling project: E2E_tests_pipeline Starting building: E2E_tests_pipeline #3 [Pipeline] } [Pipeline] // stage [Pipeline] } [Pipeline] // node [Pipeline] End of Pipeline Finished: SUCCESS
Console Logs From E2E_tests_pipeline
Please find that we see in the console log the value of passed parameter.
Started by upstream project "Build_pipeline" build number 11 originally caused by: Started by user admin Running in Durability level: MAX_SURVIVABILITY [Pipeline] Start of Pipeline [Pipeline] node Running on Jenkins in /var/jenkins_home/workspace/E2E_tests_pipeline [Pipeline] { [Pipeline] stage [Pipeline] { (E2E Tests) [Pipeline] echo Running E2E tests... [Pipeline] echo MY_PARAM=value from Build pipeline [Pipeline] } [Pipeline] // stage [Pipeline] } [Pipeline] // node [Pipeline] End of Pipeline Finished: SUCCESS
Additional Parameters
Due to the rest of functions are ENABLED by default" we can explicitly disable them. Disable “Wait for completion” setting wait flag to false:
build job: 'E2E_tests_pipeline', parameters: [string(name: 'MY_PARAM', value: 'my default value')], wait: false
Disable “Propagate errors” setting propagate flag to false. It can help you if you don’t want to propagates errors from triggered (E2E_test_pipeline) to invoking pipeline (Build_pipeline).
# Script build job: 'E2E_tests_pipeline', parameters: [string(name: 'MY_PARAM', value: 'my default value')], propagate: false
Set “Quiet period” value. This allow you to control the delay time in seconds before the second pipeline will be built and run. In example below I set quietPeriod: 10 [seconds].
# Script build job: 'E2E_tests_pipeline', parameters: [string(name: 'MY_PARAM', value: 'my default value')], propagate: false, quietPeriod: 10
That’s all about how to trigger another pipeline from current job! I hope that this post helped you to resolve your problem! Thanks in advance for sharing this post to other people! Let other people also get help!
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