Preparing CI/CD(Jenkins) to Java projects

Preparation and configuration of instructions for quicker and simpler starting project

Acknowledgements

• CI/CD and automation systems

Preparation of servers

You need at least one machine to run Ansible playbooks and Terraform, one to run Jenkins and last one for Tomcat service(or other java builder)

Clone github repositiry to your machine

Create repositiry to put git project in

  mkdir configuration_files
  cd configuration_files

Clone repository with config files

  git clone https://github.com/bim22614/CICD_configFiles.git

Go to directory

  cd configuration_files

Terraform - creating instances (AWS)

Go to Terraform directory

   cd Terraform

Connect AWS keys

   nano main.tf

Input region you want to built instances; AccessKey and SecretKey of your user

provider "aws" {
  access_key = ""
  secret_key = ""
  region = ""
}

Init Terraform

   terraform init

Run Terraform

   terraform apply

You will get outputing with public ip of instances
Save this addresses for Ansible configuration

   Output:

instance_public_ip_jenkins = "3.86.116.52"
instance_public_ip_tomcat = "3.93.234.157"

It will create tfkey file - private key
Move this file to Key directory and change its permisions

   mv tfkey ../Key
   chmod 400 ../Key/tfkey

Ansible - installing instruments

Move to Ansible directory

   cd ../Ansible

Open hosts.txt file
You need take ip addresses that was created by AWS and input it in file

[jenkins_main]
3.86.116.52

[tomcat]
3.93.234.157

Checking connection to instances

   ansible all -m ping

Run playbook for installing Tomcat - tomcat instance

   ansible-playbook playbook_tomcat

Run playbook for installing Docker - jenkins instance

   ansible-playbook playbook_docker

Tomcat - configuration

Connect to server

   cd ../Key
   ssh ubuntu@3.93.234.157 -i tfkey

Location of JAVA

   sudo update-java-alternatives -l

Output:
 java-1.11.0-openjdk-amd64      1111       /usr/lib/jvm/java-1.11.0-openjdk-amd64

Create the systemd service file and put way JAVA to JAVA_HOME

   sudo nano /etc/systemd/system/tomcat.service

[Unit]
Description=Apache Tomcat Web Application Container
After=network.target

[Service]
Type=forking

Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-amd64/jre   #<--------------------
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment=CATALINA_BASE=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1024M -server -XX:+UseParallelGC'
Environment='JAVA_OPTS=-Djava.awt.headless=true -Djava.security.egd=file:/dev/./urandom'

ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh

User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always

[Install]
WantedBy=multi-user.target

Reload daemon and start Tomcat

   sudo systemctl daemon-reload
   sudo systemctl start tomcat

Jenkins - run through Docker

Connect to server

   ssh ubuntu@3.86.116.52 -i tfkey

Run Docker

• port 8080 - for Jenkins
• port 50000 - for WebHooks

   sudo docker run -p 8080:8080 -p 50000:50000 -v jenkins_home:/var/jenkins_home jenkins/jenkins:lts

In output you find these rows
Save this password (Jenkins autorotation)

Jenkins initial setup is required. An admin user has been created and a password generated.
Please use the following password to proceed to installation:

7444ff4ecbd1495f84993487955c38cb     <-------------------------------------

This may also be found at: /var/jenkins_home/secrets/initialAdminPassword

Connect to Jenkins:
Open browser and put your ip:8080

   3.86.116.52:8080

Put password (Jenkins autorotation) and put starting of configure jenkins by defoult Install

• Maven Plugin
• Deploy to container Plugin

Create your items and pipelines)