See this page for more details about Nexus: https://books.sonatype.com/nexus-book/reference3/

Prerequisites:

• Install Apache Maven

Download Nexus: https://www.sonatype.com/download-oss-sonatype

Extract the file "nexus-3.18.0-01-unix.tar.gz" in the folder you want to install Nexus: /opt/nexus-3.18.0-01

$ tar -xf ~/Downloads/nexus-3.18.0-01-unix.tar.gz -C /opt/

Change folders permissions:

$ sudo chmod -R 755 /opt/nexus-3.18.0-01/
$ sudo chown -R mtitek:mtitek /opt/nexus-3.18.0-01/

$ sudo chmod -R 755 /opt/sonatype-work/
$ sudo chown -R mtitek:mtitek /opt/sonatype-work/

Create a symbolic link:

$ sudo ln -s /opt/nexus-3.18.0-01/ /opt/nexus
$ sudo chown -R mtitek:mtitek /opt/nexus

You should replace mtitek:mtitek with your actual user/group names.

Change the user who run Nexus:

$ vi /opt/nexus/bin/nexus

run_as_user='mtitek'

Setup the nexus home environemnt variable:

$ vi .profile

export NEXUS_HOME=/opt/nexus
export PATH=$PATH:$NEXUS_HOME/bin

Load ".profile" environment variables:

$ source ~/.profile

Start Nexus:

$ /opt/nexus/bin/nexus start

Access the default page of Nexus: http://localhost:8081



Other Nexus commands:

Usage: /opt/nexus/bin/nexus {start|stop|run|run-redirect|status|restart|force-reload}

Log directory:

$ ls -al /opt/sonatype-work/nexus3/log

To access the "Server administration and configuration" page you must "Sign In".
The default "admin" password can be found in this file: "/opt/sonatype-work/nexus3/admin.password"



The first time you sign-in, you will see a wizard that will help you complete required setup tasks:

• Setup:
  
  
  
• Choose a password for the admin user:
  
  
  
• Configure Anonymous Access:
  
  
  
• Complete:
  
  
  

Server administration and configuration:

• Add a "mirror" element (inside element <mirrors>):
  

  <mirror>
      <id>nexus</id>
      <mirrorOf>*</mirrorOf>
      <url>http://localhost:8081/repository/maven-public/</url>
  </mirror>

  
  
• Add "server" elements for Snapshots/Releases (inside element <servers>) You can define only one if you want to use one configuration for both snapshots and releases. The default "admin" password can be found in this file: "/opt/sonatype-work/nexus3/admin.password"
  

  <server>
      <id>httpNexusSnapshots</id>
      <username>admin</username>
      <password>admin</password>
  </server>
  
  <server>
      <id>httpNexusReleases</id>
      <username>admin</username>
      <password>admin</password>
  </server>

  
  
• Add a "profile" element for nexus repositories (inside element <profiles>):
  

  <profile>
      <id>nexus</id>
  
      <repositories>
          <repository>
              <id>central</id>
              <url>http://central</url>
              <releases>
                  <enabled>true</enabled>
              </releases>
              <snapshots>
                  <enabled>true</enabled>
              </snapshots>
          </repository>
      </repositories>
  
      <pluginRepositories>
          <pluginRepository>
              <id>central</id>
              <url>http://central</url>
              <releases>
                  <enabled>true</enabled>
              </releases>
              <snapshots>
                  <enabled>true</enabled>
              </snapshots>
          </pluginRepository>
      </pluginRepositories>
  </profile>

  
  
• Add an "activeProfile" element:
  

  <activeProfiles>
      <activeProfile>nexus</activeProfile>
  </activeProfiles>

Create a local directory that will hold the maven project:

$ sudo mkdir /data/workspace

$ sudo chmod -R 755 /data/workspace/
$ sudo chown -R mtitek:mtitek /data/workspace/

Run the following command "mvn archetype:generate" to create the maven project:

$ cd /data/workspace/

$ mvn archetype:generate \
-DarchetypeGroupId=org.apache.maven.archetypes \
-DarchetypeArtifactId=maven-archetype-quickstart \
-DarchetypeVersion=1.4 \
-DgroupId=mtitek.nexus.test \
-DartifactId=mtitek-nexus-test-a \
-Dpackage=mtitek.nexus.test \
-Dversion=1.0.0-SNAPSHOT \
-DinteractiveMode=false

Configure the "pom.xml" file of the project "mtitek-nexus-test-a".
Add a "distributionManagement" element to configure the nexus repositories Snapshots and Releases:

$ cd /data/workspace/mtitek-nexus-test-a/

$ vi pom.xml

<distributionManagement>
    <snapshotRepository>
        <id>httpNexusSnapshots</id>
        <name>Snapshots repository</name>
        <url>http://localhost:8081/repository/maven-snapshots</url>
    </snapshotRepository>

    <repository>
        <id>httpNexusReleases</id>
        <name>Releases repository</name>
        <url>http://localhost:8081/repository/maven-releases</url>
    </repository>
</distributionManagement>

Run the follwoing maven command to deploy the maven artifact to nexus:

$ mvn deploy

[INFO] --- maven-deploy-plugin:2.8.2:deploy (default-deploy) @ mtitek-nexus-test-a ---

Uploading to httpNexusSnapshots: http://localhost:8081/repository/maven-snapshots/mtitek/nexus/test/mtitek-nexus-test-a/1.0.0-SNAPSHOT/mtitek-nexus-test-a-1.0.0-20161119.020742-1.jar

Uploading to httpNexusSnapshots: http://localhost:8081/repository/maven-snapshots/mtitek/nexus/test/mtitek-nexus-test-a/1.0.0-SNAPSHOT/mtitek-nexus-test-a-1.0.0-20161119.020742-1.pom

Uploading to httpNexusSnapshots: http://localhost:8081/repository/maven-snapshots/mtitek/nexus/test/mtitek-nexus-test-a/1.0.0-SNAPSHOT/maven-metadata.xml

Uploading to httpNexusSnapshots: http://localhost:8081/repository/maven-snapshots/mtitek/nexus/test/mtitek-nexus-test-a/maven-metadata.xml

• Create folders for the "snapshots" and "releases" repositories:
  

  $ sudo mkdir /data/nexus-repositories /data/nexus-repositories/snapshots /data/nexus-repositories/releases
  
  $ sudo chmod -R 775 /data/nexus-repositories
  $ sudo chown -R mtitek:mtitek /data/nexus-repositories

  
  
• Follow the following steps to setup a blob store:
  
  • Connect to Nexus Repository Manager (login with "admin").
    
    
  • Click the "Server administration and configuration" link.
    
    
  • Click the "Repository" link.
    
    
  • Click the "Blob Stores" link.
    
    
  • Click the "Create blob store" button.
    
    
  • Select the "Type" and enter a "Name" and a "Path" for the blob store.
    
    
  • Click the "Create blob store" button to save your configuration.
    
  
  
  
  Here are the fields to configure for both the snapshots and releases blob stores.
  

  Type: File
  Name: nexus-repositories-snapshots
  Path: /data/nexus-repositories/snapshots

  
  

  Type: File
  Name: nexus-repositories-releases
  Path: /data/nexus-repositories/releases

  
  
  
  
• Follow the following steps to setup the repositories:
  
  • Click the "Server administration and configuration" link.
    
    
  • Click the "Repository" link.
    
    
  • Click the "Repositories" link.
    
    
  • Click the "Create repository" button.
    
    
  • Click the "maven2 (hosted)" link.
    
    
  • Enter a "Name" and Select the "Version policy" and a "Blob store" for the repository.
    
    
  • Click the "Create repository" button to save your configuration.
    
  
  
  
  Here are the fields to configure for both the snapshots and releases repositories.
  

  Name: nexus-repositories-snapshots
  Version policy: Snapshot
  Blob store: nexus-repositories-snapshots

  
  

  Name: nexus-repositories-releases
  Version policy: Release
  Blob store: nexus-repositories-releases

  
  You can also define the following properties for your repository:
  
  • Strict Content Type Validation:
    Validate that all content uploaded to this repository is of a MIME type appropriate for the repository format: yes|no
    
    
  • Deployment policy:
    Controls if deployments of and updates to artifacts are allowed
    Deployment policy: Disable redeploy|Allow redeploy|Read-only
    
  
  
  
  
• Configure the "pom.xml" file of your project.
  Add (or modify) the "distributionManagement" element to configure the nexus repositories (Snapshots and Releases):
  

  $ cd /data/workspace/mtitek-nexus-test-a/
  
  $ vi pom.xml

  
  

  <distributionManagement>
      <snapshotRepository>
          <id>httpNexusSnapshots</id>
          <name>Snapshots repository</name>
          <url>http://localhost:8081/repository/nexus-repositories-snapshots/</url>
      </snapshotRepository>
  
      <repository>
          <id>httpNexusReleases</id>
          <name>Releases repository</name>
          <url>http://localhost:8081/repository/nexus-repositories-releases/</url>
      </repository>
  </distributionManagement>

  
  
• Deploy your project:
  

  mvn deploy