Devops2

bittertea

May 20th, 2025 (edited)

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######### LAB 2 ########
mvn --version
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.5 -DinteractiveMode=false
cd my-app
mvn compile
mvn package
java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App
######### LAB 3 #########
gradle -v
mkdir gradle_project
cd gradle_project
gradle init --type java-application
// if error after above command:
JAVA_HOME=/usr/lib/jvm/java-1.11.0-openjdk-amd64/
PATH=$PATH:$HOME/bin:$JAVA_HOME/bin
export JAVA_HOME
gradle build
gradle run
//Open build.gradle and add below code:
task hello {
doLast {
println 'Hello Gradle!'
}
}
gradle hello
######### LAB 4 #########
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.5 -DinteractiveMode=false
cd my-app
mvn compile
mvn package
// if error in above commands:
// if pom.xml file does not have property tag then type this code BELOW url tag and ABOVE dependencies tag:
<properties>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.targer>1.6</maven.compiler.target>
</properties>
// OR if it has property tag, then change 17 to 11 in property tag
// run mvn compile and mvn package commands again and the error should be resolved
gradle init --type pom
// if error after above command then run below 3 commands:
JAVA_HOME=/usr/bin/jvm/java-11-openjdk-amd64
export PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME
// in build.gradle file:
//add line:
apply plugin: 'application'
//change 1.5 to 1.6 such that:
sourceCompatibility = 1.6
targetCompatibility = 1.6
//at the end add below code:
mainClassName = 'com.mycompany.app.App'
gradle build
gradle run
######### LAB 6 #########
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.5 -DinteractiveMode=false
cd my-app/
mvn package
// login to github account, click on Create Repository
// Give the repo a name (lab-6-devops), click the "Add ReadMe file" and confirm
git config --global user.email "[email protected]"
git config --global user.name "stelister"
git init
git add pom.xml
git commit -m "commit maven file"
ssh-keygen -t ed25519 -C "[email protected]"
cat /home/student/.ssh/id_ed25519.pub
// go to github Settings > SSH & GPG Keys and click on "New ssh key"
// give a title and paste the output of the cat command under 'Key', then click on 'Add SSH key'
git remote add origin [email protected]:stelister/lab-6-devops
git config --global push.autoSetupRemote true
git push origin main
// if error after above command:
git pull --rebase origin main
// now retry:
git push origin main
sudo systemctl start jenkins
sudo systemctl status jenkins
// open jenkins by navigating to 'localhost:8080' in browser
// login: username: admin
sudo cat var/lib/jenkins/secrets/initialAdminPassword
// paste password
// in dashboard, click on "New Item", enter Item name and select "Pipelin", click "Ok"
// scroll down and type the following script:
pipeline
{
agent any
stages
{
stage('Checkout')
{
steps
{
git branch: 'main', url: 'https://github.com/stelister/lab-6-devops.git';
}
}
stage('Build')
{
steps
{
sh 'mvn clean package'
}
}
stage('Test')
{
steps
{
sh 'mvn test'
}
}
}
}
// click on 'Save', from the dashboard click on 'Build Now'
// then click on the build and go to 'Console Output'
######### LAB - 7 #########
make a folder called "lab7" in the home folder
open this folder
create these new files using gedit in this folder-
hosts.ini
playbook.yml
playbook2.yml
create another folder in this folder called "library"
go to the "library" folder and create a new file in the "library" folder called-
hello_world.py
---------
In "hosts.ini" file paste below code using gedit-
[local]
localhost ansible_connection=local
---------
In "playbook.yml" file paste below code using gedit-
- name: 1st Playbook
hosts: local
connection: local
tasks:
- name: Print simple message
debug:
msg: "Hello, welcome to Ansible..."
---------
In "playbook2.yml" file paste below code using gedit-
- name: Test custom module
hosts: localhost
gather_facts: no
tasks:
- name: Say Hello
hello_world:
name: "Ansible"
register: result
- name: Show message
debug:
msg: "{{result.message}}"
---------
In the "hello_world.py" file paste the below code using gedit-
#!/usr/bin/python
from ansible.module_utils.basic import AnsibleModule
def run_module():
module_args=dict(name=dict(type='str',required=True))
module=AnsibleModule(argument_spec=module_args)
result={"changed":False, "message":f"Hello, {module.params['name']}!"}
module.exit_json(**result)
if __name__=="__main__":
run_module()
---------
Now, right-click open terminal inside "lab7" folder and paste and enter below commands one-by-one for output:
$ ansible all -i hosts.ini --list-hosts
$ ansible all -i hosts.ini -m ping
$ ansible-playbook -i hosts.ini playbook.yml
$ chmod +x library/hello_world.py
$ ansible-playbook -i hosts.ini playbook2.yml
######### LAB 8 #########
// Repeat the following steps from Lab-6:
mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.5 -DinteractiveMode=false
cd my-app/
mvn package
// login to github account, click on Create Repository
// Give the repo a name (devops-lab-10), click the "Add ReadMe file" and confirm
git config --global user.email "[email protected]"
git config --global user.name "stelister"
git init
git add pom.xml
git commit -m "commit maven file"
ssh-keygen -t ed25519 -C "[email protected]"
cat /home/student/.ssh/id_ed25519.pub
// go to github Settings > SSH & GPG Keys and click on "New ssh key"
// give a title and paste the output of the cat command under 'Key', then click on 'Add SSH key'
git remote add origin [email protected]:stelister/devops-lab-10
git config --global push.autoSetupRemote true
git push origin main
// if error after above command:
git branch -M main
// repeat
git push origin main
// if error still persists:
git pull --rebase origin main
// now retry:
git push origin main
// NOW, create an empty jar file:
gedit t.jar
sudo systemctl start jenkins
sudo systemctl status jenkins
// open jenkins by navigating to 'localhost:8080' in browser
// login: username: admin
sudo cat /var/lib/jenkins/secrets/initialAdminPassword
// paste password
// in dashboard, click on "New Item", enter Item name and select "Pipeline", click "Ok"
// scroll down and type the following script:
pipeline
{
agent any
stages
{
stage("Checkout")
{
steps
{
git branch: 'main', url : 'https://github.com/stelister/devops-lab-10.git'
}
}
stage("Build")
{
steps
{
sh 'mvn clean package'
}
}
stage("Test")
{
steps
{
sh 'mvn test'
}
}
stage("Archive Artifacts")
{
steps
{
archiveArtifacts artifacts: '**/target/*.jar', allowEmptyArchive: true
}
}
stage("Deploy")
{
steps
{
sh """
export ANSIBLE_HOST_KEY_CHECKING=False
ansible-playbook -i hosts.ini mydeploy.yml --extra-vars='ansible_become_pass=exam@cse'
"""
}
}
}
}
// click on "Save"
// Click on "Build Now"
// !! You must click build now, and let your 1st build fail purposely to proceed further
//create hosts.ini:
sudo nano /var/lib/jenkins/workspace/<Your pipeline name>/hosts.ini
//code inside hosts.ini:
[local]
localhost ansible_connection=local
// Save and exit nano::: Ctrl + o > Press enter > Ctrl + x
//Create a playbook mydeploy.yml by executing the following command:
sudo nano /var/lib/jenkins/workspace/<Your pipeline name>/mydeploy.yml
//Paste below code inside mydeploy.yml:
---
- name: Deploy Artifact to Localhost
hosts: localhost
tasks:
- name: Copy the artifact to the target location
become: true
become_user: student
become_method: su
copy:
src: "/var/lib/jenkins/workspace/< Your pipeline name >/target/my-app-1.0-SNAPSHOT.jar"
dest: "/home/student/t.jar"
// Save and exit nano::: Ctrl + o > Press enter > Ctrl + x
// go to jenkins and click "Build Now" again
// Click on “Stages” in the Jenkins Dashboard to see the final result showing all the 5 stages in green tick.

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