Jenkins part9

Class 29th Jenkins May 21st

Jenkins part is over final Project below
->Why is the deployment and why it is ?

->Deployment flow

->Environment Setup

->What precautions should we take before deployment?

->Jenkins End-to-End Project: Practical

We will take one Java Project from Git, deploy into the application (tomcat) container

->Why is the deployment and why it is ?

Deployment : Deployment refers to the process of installing a web application on a server.

(simple what every we build .jar/.war application file simple copying to application servers called deployment,but now days no one not do direct copy, we do deployment with tools)

Why Deployment:

the main Reasons of the deployment are:

.Installation of a web-application on web-server.

.Adding new features to the application and fixing bugs.

.Enhancing existing features and improving performance.

.Breakdown large applications into microservices for better scalability and maintainability.

Practical

Deployment Flow

Step1:

Need to create two Instances Jenkins , tomcat and nexus

Jekins Server

[root@ip-10-0-0-81 ~]# yum install -y java-17-amazon-corretto-devel git

[root@ip-10-0-0-81 ~]# sudo wget -O /etc/yum.repos.d/jenkins.repo \ https://pkg.jenkins.io/redhat-stable/jenkins.repo

[root@ip-10-0-0-81 ~]# sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key

[root@ip-10-0-0-81 ~]# sudo yum install jenkins

click y

[root@ip-10-0-0-81 ~]# systemctl start jenkins

Connect jenkins public ip http://54.195.135.216:8080/

[root@ip-10-0-0-81 jenkins]# cat /var/lib/jenkins/secrets/initialAdminPassword
dd9c30c4b0b2451098c09233c9d60ab9
click initiated create user admin/ required password

Tomcat server :tomcat-users.xml using for some roles to add, '56d' d means delete

Take public ip for the server

tomcat.sh script

yum install java-17-amazon-corretto -y

wget https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.7/bin/apache-tomcat-11.0.7.tar.gz

(This is not final one you main url check latest version and download)

tar -zxvf apache-tomcat-11.0.7.tar.gz

sed -i '56 a\<role rolename="manager-gui"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '57 a\<role rolename="manager-script"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '58 a\<user username="tomcat" password="ccit123" roles="manager-gui, manager-script"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '59 a\</tomcat-users>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '56d' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '21d' apache-tomcat-11.0.7/webapps/manager/META-INF/context.xml

sed -i '22d' apache-tomcat-11.0.7/webapps/manager/META-INF/context.xml

sh apache-tomcat-11.0.7/bin/startup.sh

[ec2-user@ip-10-0-1-93 ~]$ sudo -i

[root@ip-10-0-1-93 ~]# vi tomcat.sh

[root@ip-10-0-1-93 ~]# sh tomcat.sh

Tomcat started.
[root@ip-10-0-1-93 ~]#

Step2: Click Manager app after open the below url ,Login with password ,mentioned above script

http://3.255.200.138:8080/

Below is the web application manager ,for this manager container ,we will hosting our application

Step3:Git project simple html webpage ,We plan deploy this into tomcat

https://github.com/cloudcomputingintelugu/ccitwebsite-java

We need create one job in Jenkis Click ok

Jobname: ccitpipe-prj

Step4: Prior we need configure maven given any name ccit-mvn click save

Dashboard> Manage Jenkins > Tools

For Containerization we need add one plugin

Dashboard> Manage Jenkins > Plugins >Available plugins

enter text Deploy to Container click install (this artifact upload)

Pipeline stage view click install (This for view good )
Nexus Artifact uploader click install(if required we can choose s3 artifact uploader)

Step5:add credentials

Dashboard> Manage Jenkins >Credentials Click system >Click Global credentials (unrestricted)

and Click add credentials

Click Create, We can another way also while pipe scripts add there also we can supply the user and password,using pipline syntax script

now Java tomcat server not supported for .jar file to deploy , only support .war or .ear file only

Another way to pipeline syntax script

Simple Step : Deployment war/ear to container

Deploy War/Ear files :target/*war

Context patch :ccitwebsite (give any name)

Contaner : Tomcat :take latest version

Credential: tomat/ccit123 (which is you given script)

Tomcat URL : http://54.185.135.216:8080/ (tomcat url public ip)

Step6: job which added early yar

Jobname: ccitpipe-prj

Definition add below script and build

pipeline {

agent any

tools

{

maven 'ccit-mvn'

}

stages {

stage('git') {

steps {

git 'https://github.com/cloudcomputingintelugu/ccitwebsite-java.git'

}

stage('build') {

steps {

sh 'mvn clean package'

}

Step7: build success

After build success ,below you jenkins server this you artifacts myweb-0.0.1.war this you need to deploy(upload) in tomcat

[root@ip-10-0-0-81 target]# pwd

/var/lib/jenkins/workspace/ccitpipe-prj/target

[root@ip-10-0-0-81 target]# ls -lrt

total 4

drwxr-xr-x 4 jenkins jenkins 89 May 22 19:25 myweb-0.0.1

drwxr-xr-x 2 jenkins jenkins 28 May 22 19:25 maven-archiver

-rw-r--r-- 1 jenkins jenkins 4069 May 22 19:25 myweb-0.0.1.war

Click Job Pipline Generate syntax script text copy add this into out job pipline stage script

deploy adapters: [tomcat9(alternativeDeploymentContext: '', credentialsId: '732bd861-4be4-49a0-aba2-04a19991b198', path: '', url: 'http://3.255.200.138:8080/')], contextPath: 'ccitwebsite', war: 'target/*.war'

Step8: Click save and build

pipeline {

agent any

tools

{

maven 'ccit-mvn'

}

stages {

stage('git') {

steps {

git 'https://github.com/cloudcomputingintelugu/ccitwebsite-java.git'

}

stage('build') {

steps {

sh 'mvn clean package'

}

stage('tomcat') {

steps {

}

Step9: after build tomcat add and build success

Step10: See below screen shot which we have given name ccitwebsite came to tomcat site

We can able host multiple website also using this

Step11:Website hosted

Above sofar done we have placed through build artifacats moved from maven to tomcat

Now we plan to go with Nexus move from artifacts nexus to tomcat prior stop this webhost

Now page is open line this ,after stopped

HTTP Status 404 – Not Found

Type Status Report

Message The requested resource [/ccitwebsite/] is not available

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

Apache Tomcat/11.0.7

Nexus

https protocol need run our website need to certificate ssl aws ssl certificate is free

We need purchase domain or Route 53

The service in AWS Console "Certificate manager "

>click List Certificate

Note :- While start nexus with micro amazon Linux facing below issue ,so Nexus minimum small Linux required it is chargeable

Launch a t2.micro EC2 with Amazon Linux 2 Failed

For Nexus minimum Linux small, with micro free tier facing issue [root@ip-10-0-1-241 bin]# ./nexus run

WARNING: ************************************************************

WARNING: Detected execution as "root" user. This is NOT recommended!

WARNING: ************************************************************

OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x000000078f550000, 1890254848, 0) failed; error='Not enough space' (errno=12)

# There is insufficient memory for the Java Runtime Environment to continue.

# Native memory allocation (mmap) failed to map 1890254848 bytes. Error detail: committing reserved memory.

# An error report file with more information is saved as:

# /opt/nexus/nexus-3.80.0-06/hs_err_pid7284.log

[root@ip-10-0-1-241 bin]# Connection to 3.249.223.100 closed by remote host.

Connection to 3.249.223.100 closed

Step1: Nexus Launching

Amazon linux

Instance type:t2.medium

Storge changed 20 GB

Step2:

Java Installation

[ec2-user@ip-10-0-0-244 ~]$ sudo -i

[root@ip-10-0-0-244 ~]# sudo yum install -y java-17-amazon-corretto-devel

Step3: Need Install Nexus in linux,for software always go with prior url

https://help.sonatype.com/en/download.html

and Download latest version above url take you latest Unix Nexus repository right click url save copy link address

[root@ip-10-0-0-244 ~]#wget https://download.sonatype.com/nexus/3/nexus-3.80.0-06-linux-x86_64.tar.gz

[root@ip-10-0-0-244 ~]#tar -zxvf nexus-3.80.0-06-linux-x86_64.tar.gz

Step4:User creation nexus

[root@ip-10-0-0-244 ~]# useradd nexus

[root@ip-10-0-0-244 ~]# ls -lrt

total 416436

drwxr-xr-x 3 root root 20 May 2 20:55 sonatype-work

-rw-r--r-- 1 root root 426428974 May 6 16:15 nexus-3.80.0-06-linux-x86_64.tar.gz

drwxr-xr-x 6 root root 94 May 23 10:23 nexus-3.80.0-06

[root@ip-10-0-0-244 ~]# chown nexus:nexus nexus-3.80.0-06 sonatype-work

[root@ip-10-0-0-244 ~]# ls -lrt

total 416436

drwxr-xr-x 3 nexus nexus 20 May 2 20:55 sonatype-work

-rw-r--r-- 1 root root 426428974 May 6 16:15 nexus-3.80.0-06-linux-x86_64.tar.gz

drwxr-xr-x 6 nexus nexus 94 May 23 10:23 nexus-3.80.0-06

Step5: In the nexus file need to change line number 27 run_as_user='' to run_as_user='nexus'

[root@ip-10-0-0-244 bin]# vi nexus

:set number

(set number command for vi script number display)

26 # user to execute as; optional but recommended to set

27 run_as_user='nexus'

[root@ip-10-0-0-244 opt]# mkdir -p /opt/sonatype-work/nexus3

Getting some permission issue

[root@ip-10-0-0-244 bin]# ./nexus start

-bash: /root/nexus-3.80.0-06/bin/nexus: Permission denied

[root@ip-10-0-0-244 bin]# mkdir -p /opt/nexus

[root@ip-10-0-0-244 bin]# mv /root/nexus-3.80.0-06 /opt/nexus/

[root@ip-10-0-0-244 bin]# cd /opt/nexus/nexus-3.80.0-06/bin

[root@ip-10-0-0-244 bin]# ./nexus start

Last login: Fri May 23 10:26:39 UTC 2025 on pts/0

mkdir: cannot create directory ‘/opt/nexus/nexus-3.80.0-06/../sonatype-work’: Permission denied

realpath: ‘/opt/nexus/nexus-3.80.0-06/../sonatype-work/nexus3’: No such file or directory

mkdir: cannot create directory ‘/log’: Permission denied

Starting nexus

/opt/nexus/nexus-3.80.0-06/bin/nexus: line 175: /nexus.pid: Permission denied

[root@ip-10-0-0-244 bin]# cd /opt/nexus/nexus-3.80.0-06

[root@ip-10-0-0-244 nexus-3.80.0-06]# ls

bin deploy etc jdk NOTICE.txt OSS-LICENSE.txt

[root@ip-10-0-0-244 opt]# chown -R nexus:nexus /opt/sonatype-work -R

[root@ip-10-0-0-244 opt]# sudo passwd nexus

Changing password for user nexus.

New password:

BAD PASSWORD: The password is shorter than 8 characters

Retype new password:

passwd: all authentication tokens updated successfully.

[root@ip-10-0-0-244 opt]# sudo chown -R nexus:nexus /opt/nexus

[root@ip-10-0-0-244 opt]# export NEXUS_DATA=/opt/nexus/sonatype-work

[root@ip-10-0-0-244 opt]# sudo su - nexus

Last login: Fri May 23 10:33:20 UTC 2025 on pts/0

[nexus@ip-10-0-0-244 ~]$ /opt/nexus/nexus-3.80.0-06/bin/nexus start

Starting nexus

[nexus@ip-10-0-0-244 ~]$ /opt/nexus/nexus-3.80.0-06/bin/nexus stop

Shutting down nexus

Stopping nexus running with pid 9738

Step6: Take the public Ip for the nexus instance default port 8081

[nexus@ip-10-0-0-244 opt]$ cat /opt/nexus/sonatype-work/nexus3/admin.password

88d25272-af46-45b7-adf9-ae42f115d1da

Click Sign in Next > Choose Radio Disable anonymous access >Click next

Step7: Click repository ,select maven2(hosted)

Step8: Give any repo name in nexus repository and select deployment policy Allow redeploy

Step9:Created one repository in nexus successfully

Step10: Jenkins pipline job, need to added nexus script step,with that take help of pipeline syntax script ,Select below options, Process url past nexus url with out http

10.1

10.2 add admin credential of nexus Groupid,version get it from the Git Pom.xml,Repository ccitrepo nexus repo name

10.3: Artifact id ,type of file war , war file location in jenkins server ,click generate pipline script

10.4 Git Project below pom.xml

Step11: ccitpipelinejob >Configuration > add below script ,nexus script you need replace with your pipline syntax script

pipeline {

agent any

tools

{

maven 'ccit-mvn'

}

stages {

stage('git') {

steps {

git 'https://github.com/cloudcomputingintelugu/ccitwebsite-java.git'

}

stage('build') {

steps {

sh 'mvn clean package'

}

stage('nexus') {

steps {

deploy adapters: [tomcat9(alternativeDeploymentContext: '', credentialsId: '8cf5a8fa-814b-4f44-9834-510bd831b76e', path: '', url: 'http://3.250.85.185:8080/')], contextPath: 'ccitwebsite', war: 'target/*.war'

}

stage('tomcat') {

steps {

}

Here is the screen shot script need add click save the job

Step 12. Save job and Build it is completed Successfully, with stage view you see nexus added file transfer to tomcat

Step13: See here below screen shot , nexus repo .war file deployed successfully, in the nexus pipeline script, for difference first example maven to tomcat, second example maven ->nexus->tomcat hostname change "ccitwebsite1"

Step14: See below Application path newly came /ccitwebsite1

Step2: After click, web host page opened successfully.

--Thanks

Using S3 Bucket instead of Nexus High-end server paid not free-tier

Step1: Using I am Service create one user jenkins-s3-user, Add policy "AmazonS3FullAccess" and create

Step2:Add Security key for the user ,download for better

Step3:

Source :Jenkin Server already Java,Git and Jenkis installed started Jenkin service

Create one simple S3 bucket in aws >

Name Bucket :ccitnexusbucket

Bucket type :General Purpose

Object ownership : ASLs disabled(recommended) default

Created one bucket

Step4:

Jenkins Dashboard → Manage Jenkins →plugins >Available plugins

S3 publisher, (optional Stage viewer)

Step5: After Added Plugins , Need to attach Iam user( i.e jenkins-s3-user Download Accesskey ) to S3 profile below navigation

Jenkins Dashboard → Manage Jenkins >System

Profile :aws-profile (given name)

Access key:XXXXXX(which you have download IAM User )

Secret key:XXXXX

Click Save

Step6: For Generate Pipeline script use job Pipeline syntax

Sample step: General Build Step

Build Step :Publish Artifacts to S3 Bucket

S3 Profile : aws-profile (it came automatically which you have add profile above step)

Source :target/*.war (Jenkins sever where you artifacts)

Destination bucket: ccitnexusbucket

Bucket Region : eu-west-1 (where you bucket region)

Click Generate pipeline script ,copy the test

Step7:Genkins > Create one job pipeline job Click save and Build

pipeline {

agent any

tools{

maven 'ccit-mvn'

}

stages {

stage('git') {

steps {

git 'https://github.com/cloudcomputingintelugu/ccitwebsite-java.git'

}

stage('build') {

steps {

sh 'mvn clean package'

}

stage('Upload to S3') {

steps {

s3Upload consoleLogLevel: 'INFO', dontSetBuildResultOnFailure: false, dontWaitForConcurrentBuildCompletion: false, entries: [[bucket: 'ccitnexusbucket', excludedFile: '', flatten: false, gzipFiles: false, keepForever: false, managedArtifacts: false, noUploadOnFailure: false, selectedRegion: 'eu-west-1', showDirectlyInBrowser: false, sourceFile: 'target/*.war', storageClass: 'STANDARD', uploadFromSlave: false, useServerSideEncryption: false]], pluginFailureResultConstraint: 'FAILURE', profileName: 'aws-profile', userMetadata: []

}

Step8: Build success, See below S3 upload also success

Step9:See below s3 ccitnexusbucket artifacts uploaded successfully.

Step10:

Create one instance >tomcat Server > execute below script root

tomcat.sh script

yum install java-17-amazon-corretto -y

wget https://dlcdn.apache.org/tomcat/tomcat-11/v11.0.7/bin/apache-tomcat-11.0.7.tar.gz

(This is not final one you main url check latest version and download)

tar -zxvf apache-tomcat-11.0.7.tar.gz

sed -i '56 a\<role rolename="manager-gui"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '57 a\<role rolename="manager-script"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '58 a\<user username="tomcat" password="ccit123" roles="manager-gui, manager-script"/>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '59 a\</tomcat-users>' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '56d' apache-tomcat-11.0.7/conf/tomcat-users.xml

sed -i '21d' apache-tomcat-11.0.7/webapps/manager/META-INF/context.xml

sed -i '22d' apache-tomcat-11.0.7/webapps/manager/META-INF/context.xml

sh apache-tomcat-11.0.7/bin/startup.sh

Step11: login tomcate public ip

Step12:

Another way to pipeline syntax script

Simple Step : Deployment war/ear to container

Deploy War/Ear files :target/*war

Context patch :ccitwebsite (give any name)

Contaner : Tomcat :take latest version

Credential: tomat/ccit123 (which is you given script)

Tomcat URL : http://18.201.159.187:8080/ (tomcat url public ip)

deploy adapters: [tomcat9(alternativeDeploymentContext: '', credentialsId: 'ff93c1a6-d180-4658-a61f-e43c790065a5', path: '', url: 'http://18.201.159.187:8080/')], contextPath: 'ccitwebsite', war: 'target/*.war'

stage('tomcat') {

steps {

}

Full script : Step7 add above script

Step13: Build Completed Successfully