To install Nexus, you need to have Java installed on your server.
Make sure you can SSH to the server as root and we are good to go! Install Java For this, I am using a an Ubuntu server hosted on Digital Ocean. It could be a remote server from a IaaS provider or could be a VM running Linux on your local machine. You need to have a Linux server prepared to install Nexus. The usage of an artifact repository manager is considered an essential best practice for any significant CI/CD development environment.
It can serve as a central repository to retrieve both private artifacts of your company, as well as artifacts from public repositories such as MvnRepository for Maven. You can manage versions of build artifacts of your application very easily. If you need the latest release version from a different component for the component you are developing, you can easily retrieve it from the artifact repository without having to look everywhere. Assume you have a lot of inter-dependent components in your application. You can also retrieve them easily when necessary. A repository manager allows you to upload and store different build artifacts of your software application. An artifact repository manager is a server application designed to to achieve exactly that. Therefore, we need a way to manage these artifacts easily to support the development process. Depending on the technologies you use, type of artifacts will differ and you need different kinds of repositories for these different types. In a development environment with a Continuous Integration and Continuous Development(CI/CD) workflow, this type of artifacts are created frequently and regularly. Issue the nexus run command to start Nexus.Throughout the development process of a software application, various kinds of packages are created such as jar files, war files, Docker images etc. 
cd /tmpīelow the /opt directory, there will now be a new directory named nexus. Place in the /tmp directory on your Linux system, and then use the tar command to extract .
Select your Operating System (Linux) and select Download. 
Ensure no other processes are using port 8081. java -versionīy default, Nexus will listen for connections on port 8081. If you do not have version 8 of Java on your Linux system, refer to Installing Java on Linux. The java -version command can be used to determine if Java is installed, and if installed, the version of Java that is running. Before installing Nexus, your Linux system must be running version 8 of Java.
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