Jenkins Installation and configuration step by step ?

how to install & configure Jenkins
=========================
requirement: 1.OS -------amazon Linux
                     2.CPU & RAM--2CPU & 4GB RAM 
                         instance family : t3.medium   0.0448USD/hour (use this one)
                                         t2.medium   0.0496USD/hour (don't use it)
                    3.volume:30GB
                    4.JAVA SOFTWARE ---->17 or 21 (Pls take 21 version)
step1: create security group
      ex: security group name : Jenkins
             add 1st port:22
             add 2nd port:8080
                    
step2: create Linux Server & attach security group 
step3: Login Linux Server
step4: install java 21
           yum whatprovides java ---it displays all the java versions
           now, select the java 21 and install it
step5: go to official Jenkins website 
           https://www.jenkins.io/doc/book/installing/linux/#red-hat-centos
step6:download Jenkins link
          sudo wget -O /etc/yum.repos.d/jenkins.repo \
           https://pkg.jenkins.io/redhat-stable/jenkins.repo
step7:import keys link
         sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io-2023.key
step8:install Jenkins software
          yum install Jenkins -y
      
step9: check the jenkins version 
           jenkins --version
step10: yum update
step11: create user
             useradd paparao
step12: modify sshd_config file
             nano /etc/ssh/sshd_config
step13:restart service
            systemctl restart sshd
step14:open sudoers file
            visudo 
            press enter
            paparao ALL=(ALL) NOPASSWD: ALL
step15: enable Jenkins & start Jenkins service
             systemctl enable Jenkins
             systemctl start Jenkins
             systemctl status Jenkins
step16: open browser and paste Jenkins server public IP address 
            1.2.3.4:8080
            press enter button 
         
step17: unlock your Jenkins 
            to unlock Jenkins we must provide the password
            but the password location is:
            /var/lib/Jenkins/secrets/initial admin password
     
            note: secrets and its files owner and group is jenkins only 
           its look like this
          Jenkins Jenkins secrets 
          we have to change the ownership of the secrets folder and its files
       
          chown -R paparao:paparao secrets
        
step18: switch to paparao user
        just open secrets folder
        and go to initial admin password file
        and copy the password
        go to browser paste the password
        enter button
step19:jenkins is ready and install required plugins (connecting softwares)
step20:you will get the Jenkins dashboard
=====end=================================

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