Knowledge: Jenkins part2

Jenkins part2
Class 22nd Jenkins May 13th
Alternative Jenkins
1.Github Actions
2.Git Lab CI/CD
3. AWS Pipeline
4.Azure Devops(pipelines)
5.CicleCI
6.Travis CI

7.ArgoCD (for Kubernetes -based CI/CD)

Jenkins Triggers

->Jenkins triggers define how and when a Jenkins job or pipeline should start

->You can configure different types of triggers to automate the execution of builds based on events such as code commits,scheduled times,or external API calls

1.Trigger builds remotely Allows external scripts or applications to trigger Jenkins builds.

For Control and security purpose

Step1: Security token generation

In Jenkins, a Security Token (often called an API token or Crumb token) is used to authenticate and authorize automated requests to Jenkins.

A Security Token in Jenkins is like a password :
Scripts, tools, or external services (like GitHub, curl, Postman) access Jenkins
Do this without exposing your actual password

See here token generated : copy and save that token it will come again

117e71fe284ff0777e2b9c5a8345c9cd09

Step2: which i have created job configuration,given the name Security key name for authorization click save

Step3:just create one file in workspace our job folder save and click build

Step4:Bulid Success

Step6: file created successfully

[root@ip-10-0-1-168 ccit-job]# pwd

/var/lib/jenkins/workspace/ccit-job

[root@ip-10-0-1-168 ccit-job]# ls -lrt

total 4

drwxr-xr-x 3 jenkins jenkins 18 May 14 03:58 src

-rw-r--r-- 1 jenkins jenkins 1541 May 14 03:58 pom.xml

drwxr-xr-x 6 jenkins jenkins 141 May 14 03:58 target

-rw-r--r-- 1 jenkins jenkins 0 May 14 06:17 ccit.txt

Step7:

Trigger builds remotely, as you here comment specified build using url also with token name

JENKINS_URL/job/ccit-job/build?token=TOKEN_NAME

http://3.252.96.43:8080/job/ccit-job/build?token=ccittoken

using command line enter this command build the application

This is one way to Build

C:\Users\Administrator>curl -u admin:117e71fe284ff0777e2b9c5a8345c9cd09 "http://3.252.96.43:8080/job/ccit-job/build?token=ccittoken"

See here automatically build started using authentication code CLI prompt

This is other way to Build

see Build success

2.Build after other projects are built: ( it is dependency for other project,after the project compile, start build the current project) -Not covered

Configures a job to run after one or more other jobs are completed

Ensure that dependent builds are executed only when their prerequisites are succesfull.

3.Build periodically? : (Cron expression run schedule base) When to perform the build period

(*) (*) (*) (*) (*)

Min Hour DOM MOY (DOW)

Triggers a job at a scheduled time using CRON syntax

Useful for routine tasks like nightly build or scheduled maintenance jobs

MINUTE	Minutes within the hour (0–59)
HOUR	The hour of the day (0–23)
DOM	The day of the month (1–31)
MONTH	The month (1–12)
DOW	The day of the week (0–7) where 0 and 7 are Sunday.

You see here given all 5 start it will run every minute all days

See here Build running every 1 mint

See here i just changed to 53 8 AM Scheduled

See here it run specific file 8:53 AM it is running

53 8 15(it will run 15th date) 8 (it will August month) , 3(day of the week) may be conflict 15 day is may be or may not be wed day )

0 is sun , 1 is mon,2 is tue ,3 is wed , 4 thu , 5 fir, 6 sat , 7 is again sun unix 7 is not there

4.GitHub hook trigger for GITScm polling? This is a build trigger option in Jenkins that lets GitHub notify Jenkins when new code is pushed to a repository. It’s faster and more efficient than Jenkins polling GitHub repeatedly.

Git Webbook set, whenever git commit Build done automatically ,Below Webhook give Jenkin url

and click webhook

Give below details Click save

Click Build manually See build 49 12.467 it is execute .jar file also create target server side

Jar file created

[ec2-user@ip-10-0-1-168 ccit-job]$ java -jar target/ccit-0.0.1.jar --server.address=0.0.0.0 --server.port=8081

Page opened

You see here java runtime alway be run if you stop webpage not work

So it is difficult always run manually instead of that we need create service that service always run background

For that Git Index page added some text commit changes

see automatically build

[ec2-user@ip-10-0-1-168 ccit-job]java -jar target/ccit-0.0.1.jar --server.address=0.0.0.0 --server.port=8081

See change once git commit automatically build done ,but above java jar need cancel and rerun effect the changes in webpage

Jar File run automictically need to configure service

5.Poll SCM?: (it is also Same to Build periodically the difference is ,whenever Git commit Changes done then only it will trigger) SCM (source code management)

If you commit any change Git hub one id will create , The Jenkins monitor ID previous commit Id ,if any commit id changes then only build will run

If you are Build period * * * * * , date and time will capture any 1 minute

Shell script for any other example for reference

#!/bin/bash

echo "Current date and time :" $(date) >> ccit.txt

[ec2-user@ip-10-0-1-168 ccit-job]$ cat ccit.txt

Current date and time : Wed May 14 12:19:30 UTC 2025

Current date and time : Wed May 14 12:20:00 UTC 2025

Current date and time : Wed May 14 12:21:00 UTC 2025

Build after other projects are built

This decencies one trigger to another Tigger, i have created 4 job all shell touch ccit1...4 txt files

step1: