A Technical I.T./DevOps Blog
Question
With the CI/CD pipeline, you hear about projects in the context of Jenkins. What is a Jenkins project?
Answer
A Jenkins project is a job. However, the term “job” is no longer used. Jenkins’ website defines a project as this: “A user-configured description of work which Jenkins should perform, such as building a piece of software, etc.” Taken from Jenkins’ website.
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Question
You have read about Jenkins nodes. Cloudbees uses the term.
You have heard of the term “Jenkins slave” servers (which are configured to use their CPU and RAM according to the main Jenkins server’s needs). What is a Jenkins node?
Answer
A Jenkins node is a Jenkins slave server.
The main Jenkins website defines a node as “A machine which is part of the Jenkins environment and capable of executing Pipelines or Projects.
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Problem Scenario
You are using Jenkins and its Credentials plugin. You are not sure if the syntax of the username and password are correct. You think that there may be a wrong username or password. You want to see how things look as they are used in a pipeline job. The console output shows the credentials as “****”. What should you do?
Solution
Warning: this is not a recommended practice.
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Question
With a newer version of Jenkins, you want to know what a multi-branch job is. What is a multi-branch Jenkins job?
Answer
In Jenkins, a project is a job; the term job has been deprecated however (according to the Jenkins’ website). To see the difference between a Jenkins pipeline and a Jenkins project, see this posting: What Is the Difference between a Jenkins Project and a Jenkins Pipeline?
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Problem scenario
You have created a webhook in Bitbucket to call a Jenkins URL. You create the triggering event in the repository (e.g., by pushing code or creating a pull request). The build associated with the Jenkins URL does not start.
You manually tested the Jenkins URL, bypassing Bitbucket, with curl -X POST. The invocation successfully starts the build.
In the Bitbucket logs you see “Connection refused” or “403 Forbidden” errors when the triggering event happens to the given repository (configured with the webhook).
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Continue reading “How Do You Troubleshoot a Bitbucket Webhook Invocation to Start a Jenkins Build?”
Question
In the context of Jenkinsfiles, there are two types of pipelines: declarative and scripted. What are the differences between these two types?
Answer
1. The syntax of the two is one difference. While both are based on Groovy, Declarative Pipeline syntax is more simple (according to this posting). Declarative Pipeline syntax follows more of an declarative paradigm whereas Scripted Pipeline syntax follows more of a imperative paradigm (according to this posting).
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Problem scenario
You want to use a Declarative pipeline in Jenkins (via a Jenkinsfile). What do you do?
Solution
Follow the directions of this posting. Use step 4.c instead of 4.b. (4.b. is just a “Hello World” example)
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Continue reading “How Do You Use a Jenkins Pipeline with a Declarative Syntax?”
Question
You have heard of Jenkins job-dsl. You are not sure if it is the same DSL found in scripted syntax Jenkinsfile pipelines. Is Jenkins job-dsl different from Jenkinsfile pipelines’ scripted syntax?
Answer
Yes. Jenkins job-dsl is different from the DSL used in Jenkinsfile pipelines’ scripted syntax. This thread confirms this fact. This link helps explain the differences.
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Continue reading “Is Jenkins job-dsl Different from Jenkinsfile Pipelines’ Scripted Syntax?”
One of the following problems apply:
Problem scenario #1
You have no idea how to start Jenkins in a Docker container. What should you do?
OR
Problem scenario #2
You have run some Docker commands to try to start deploy Jenkins in a container. You get output like this:
[4213] [10236] Disconnected
[9146] Connection from [::1]:41118
[9146] Extended attributes (16 bytes) exist <host=localhost>
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Continue reading “How Do You Get Jenkins Working in a Docker Container?”
Question
What is “continuous integration” or “continual integration”?
Answer
Continuous integration (or continual integration) is the convergence of code from two or more developers via an automated process. We arrived at this definition from summarizing and extrapolating from the following three quotes:
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Continue reading “What is “continuous integration” (or CI or “continual integration”)?”