Credentials for Git access in Jenkins - Step-by-Step Execution

Process Flow - Credentials for Git access

Start Jenkins Job

↓

Check Git Credentials

↓

Use Credentials to Authenticate

↓

Clone or Pull Git Repository

↓

Success or Fail

↓

Job Continues or Stops

This flow shows how Jenkins uses stored Git credentials to authenticate and access a Git repository during a job.

Execution Sample

Jenkins

pipeline {
  agent any
  stages {
    stage('Checkout') {
      steps {
        git credentialsId: 'git-creds', url: 'https://github.com/example/repo.git'
      }
    }
  }
}

This Jenkins pipeline uses stored credentials with ID 'git-creds' to access a Git repository.

Process Table

Step	Action	Credentials Used	Git Command	Result
1	Start Jenkins job	None yet	N/A	Job starts
2	Check for credentials	git-creds	N/A	Credentials found
3	Authenticate with Git	git-creds	git clone https://github.com/example/repo.git	Authentication succeeds
4	Clone repository	git-creds	git clone https://github.com/example/repo.git	Repository cloned
5	Job continues	git-creds	N/A	Next steps execute

💡 Job proceeds after successful Git clone using credentials

Status Tracker

Variable	Start	After Step 2	After Step 3	After Step 4	Final
credentialsId	None	git-creds	git-creds	git-creds	git-creds
gitCommand	None	None	git clone https://github.com/example/repo.git	git clone https://github.com/example/repo.git	None
jobStatus	Not started	Running	Running	Running	Running

Key Moments - 2 Insights

Why do we need to specify credentialsId in the git step?

The credentialsId tells Jenkins which stored credentials to use for authenticating with Git. Without it, Jenkins cannot access private repositories. See execution_table step 2 and 3.

What happens if the credentials are wrong or missing?

The git clone command will fail authentication, causing the job to fail or stop. This is shown by the importance of step 3 in the execution_table.

Visual Quiz - 3 Questions

Look at the execution table, at which step does Jenkins use the credentials to authenticate with Git?

A Step 1

B Step 2

C Step 3

D Step 5

💡 Hint

Check the 'Credentials Used' and 'Git Command' columns in the execution_table at each step.

According to the variable tracker, what is the value of 'credentialsId' after step 2?

A git-creds

B None

C https://github.com/example/repo.git

D Running

💡 Hint

Look at the 'credentialsId' row and the 'After Step 2' column in variable_tracker.

If the credentialsId was missing, how would the execution_table change?

A Step 5 would clone the repo without credentials

B Step 3 would show authentication failure

C Step 1 would fail to start the job

D No change, job runs normally

💡 Hint

Refer to key_moments about what happens if credentials are wrong or missing.

Concept Snapshot

Jenkins Git credentials:
- Use 'credentialsId' in git step to authenticate
- Credentials stored securely in Jenkins
- Required for private repo access
- Authentication happens before clone
- Job fails if credentials invalid

Full Transcript

This visual execution shows how Jenkins uses stored credentials to access a Git repository. The job starts, Jenkins checks for the credentialsId 'git-creds', then uses it to authenticate with Git during the clone command. If authentication succeeds, the repository is cloned and the job continues. Variables like credentialsId and gitCommand track the state. Key moments include why credentialsId is needed and what happens if credentials are missing. The quiz tests understanding of when credentials are used and their effect on job execution.