Installing Nexus on Cent OS - cloudeguru/How-To-Install GitHub Wiki

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In this document we will see a step by step guide on how to install Nexus on Cent OS

What is Nexus ?

Nexus Repository Manager is a repository manager used for storing and managing software artifacts. It serves as a central hub for storing binary artifacts such as JAR files, Docker images, npm packages, Maven artifacts, and more. Nexus provides a secure, reliable, and scalable solution for managing dependencies and artifacts throughout the software development lifecycle.

Steps to run Nexus on CentOS:

1. Launch a t2 medium AWS EC2 instance and choose OS as CentOS 9 or your choice of CentOS 9 and login to it.

2. If you are launching instance on AWS add the below script as part of user data.

     #!/bin/bash
     yum install java-1.8.0-openjdk.x86_64 wget -y
     mkdir -p /opt/nexus/
     mkdir -p /tmp/nexus/                           `
     cd /tmp/nexus/
     NEXUSURL="https://download.sonatype.com/nexus/3/latest-unix.tar.gz"
     wget $NEXUSURL -O nexus.tar.gz
     sleep 10
     EXTOUT=`tar xzvf nexus.tar.gz`
     NEXUSDIR=`echo $EXTOUT | cut -d '/' -f1`
     sleep 5
     rm -rf /tmp/nexus/nexus.tar.gz
     cp -r /tmp/nexus/* /opt/nexus/
     sleep 5
     useradd nexus
     chown -R nexus.nexus /opt/nexus
     cat <<EOT>> /etc/systemd/system/nexus.service
     [Unit]                                                                          
     Description=nexus service                                                       
     After=network.target                                                            
                                                              
     [Service]                                                                       
     Type=forking                                                                    
     LimitNOFILE=65536                                                               
     ExecStart=/opt/nexus/$NEXUSDIR/bin/nexus start                                  
     ExecStop=/opt/nexus/$NEXUSDIR/bin/nexus stop                                    
     User=nexus                                                                      
     Restart=on-abort                                                                
                                                              
     [Install]                                                                       
     WantedBy=multi-user.target                                                      
   
     EOT
   
     echo 'run_as_user="nexus"' > /opt/nexus/$NEXUSDIR/bin/nexus.rc
     systemctl daemon-reload
     systemctl start nexus
     systemctl enable nexus
   

3. If you are using any other system of CentOS run the below commands one by one.

4. Install Java in CentOS

   yum install java-1.8.0-openjdk.x86_64 wget -y

5. Make a directory nexus inside /opt and /tmp using below commands

   mkdir -p /opt/nexus mkdir -p /tmp/nexus

6. Download latest nexus inside /tmp/nexus

   wget https://download.sonatype.com/nexus/3/latest-unix.tar.gz -O nexus.tar.gz

7. Untar it using below command

   tar xzvf nexus.tar.gz

8. Delete the tar file now and copy all the contents to /opt/nexus using below commands

   rm -rf /tmp/nexus/nexus.tar.gz cp -r /tmp/nexus/* /opt/nexus

9. Create a nexus user using below command

   useradd nexus

10. Provide nexus user permission to /opt/nexus directory by following below command

    chown -R nexus.nexus /opt/nexus/

11. Create a service for nexus by adding nexus.service file inside /etc/systemd/system by running below command

    vim /etc/systemd/system/nexus.service

    and add below content [Unit]
    Description=nexus service
    After=network.target

    [Service]
    Type=forking
    LimitNOFILE=65536
    ExecStart=/opt/nexus/$NEXUSDIR/bin/nexus start
    ExecStop=/opt/nexus/$NEXUSDIR/bin/nexus stop
    User=nexus
    Restart=on-abort

    [Install]
    WantedBy=multi-user.target

12. Edit nexus.rc file inside /opt/nexus/nexus3*/nexus.rc and uncomment the line run_as_user and add nexus . The content should be

    run_as_user="nexus"

    save and quit.

13. Reload system manager

    systemctl daemon-reload

14. Start nexus service

systemctl start nexus

12. Enable nexus service

systemctl enable nexus

13. If all good then open your favorite browser and add http://host-ip:port, you should see something like below

14. Click on login option at the right top corner and you will see that username is admin and password can be retrieved from given location. Cat the file and get the password

sudo cat /opt/nexus/sonatype-work/nexus3/admin.password