Pipeline visualization and debugging in Jenkins - Step-by-Step Execution

Process Flow - Pipeline visualization and debugging

Start Pipeline

↓

Stage 1: Checkout Code

↓

Stage 2: Build

↓

Stage 3: Test

↓

Stage 4: Deploy

↓

Pipeline Complete

↓

Check Logs & Visualize

↓

Debug Errors if any

↓

Fix & Re-run Pipeline

↓

End

The pipeline runs through stages sequentially, then logs and visualization help find errors to debug and fix.

Execution Sample

Jenkins

pipeline {
  agent any
  stages {
    stage('Build') { steps { echo 'Building...' } }
    stage('Test') { steps { echo 'Testing...' } }
  }
}

A simple Jenkins pipeline with Build and Test stages printing messages.

Process Table

Step	Stage	Action	Result	Status
1	Build	Start Build stage	Build stage started	Running
2	Build	Execute echo 'Building...'	Output: Building...	Success
3	Build	Finish Build stage	Build stage completed	Success
4	Test	Start Test stage	Test stage started	Running
5	Test	Execute echo 'Testing...'	Output: Testing...	Success
6	Test	Finish Test stage	Test stage completed	Success
7	Pipeline	Complete all stages	Pipeline finished successfully	Success

💡 Pipeline ends after all stages complete successfully.

Status Tracker

Variable	Start	After Step 2	After Step 5	Final
currentStage	None	Build	Test	None
stageStatus	None	Success	Success	Success
pipelineStatus	Running	Running	Running	Success

Key Moments - 3 Insights

Why does the pipeline stop if a stage fails?

The pipeline stops because Jenkins marks the stage as failed (see Step 2 or 5 in execution_table) and does not proceed to next stages to avoid further errors.

How can I see what happened inside a stage?

You can check the console output logs for each stage (refer to 'Result' column in execution_table) which shows commands run and their output.

What does 'Running' status mean in the pipeline?

'Running' means the stage or pipeline is currently executing (see Steps 1 and 4 in execution_table). It changes to 'Success' or 'Failed' after completion.

Visual Quiz - 3 Questions

Look at the execution_table, what is the status after Step 3?

A Running

B Failed

C Success

D Not started

💡 Hint

Check the 'Status' column for Step 3 in execution_table.

At which step does the Test stage start?

A Step 2

B Step 4

C Step 3

D Step 5

💡 Hint

Look at the 'Stage' and 'Action' columns in execution_table to find when Test stage starts.

If the Build stage fails at Step 2, what happens next?

A Pipeline stops immediately

B Pipeline continues to Test stage

C Pipeline retries Build stage automatically

D Pipeline skips Build and Test stages

💡 Hint

Refer to key_moments about pipeline stopping on stage failure.

Concept Snapshot

Jenkins Pipeline runs stages in order.
Each stage shows status: Running, Success, or Failed.
Logs show commands and outputs for debugging.
Pipeline stops on stage failure to prevent errors.
Use visualization and logs to find and fix issues.

Full Transcript

A Jenkins pipeline runs through defined stages one by one. Each stage starts, runs commands, and finishes with a status. The pipeline shows Running while executing and Success or Failed after. Logs capture outputs for each step. If a stage fails, the pipeline stops to avoid further problems. Visualization tools help track progress and debug errors by showing stage status and logs. Fixing errors and re-running the pipeline is the usual workflow.