What is nexus?
--> Nexus is artifact manager, artifact is nothing but when code is build it generates an artifact which can be deployed on targets.
Nexus is a repository manager. It allows you to proxy, collect, and manage your dependencies so that you are not constantly juggling
a collection of JARs. It makes it easy to distribute your software. Internally, you configure your build to publish artifacts to Nexus
and they then become available to other developers. You get the benefits of having your own 'central', and there is no easier way to collaborate.

Latest nexus installation GUIDE LINK - https://github.com/ValaxyTech/DevOpsDemos/blob/master/Nexus/Nexus_Installation.MD

Latest version of Sonatype Nexus needs Java 8 version

add-apt-repository ppa:openjdk-r/ppa

apt-get update

apt-get install openjdk-8-jdk

java -version

cd /usr/local

• Download http://download.sonatype.com/nexus/3/nexus-3.6.0-02-unix.tar.gz (OR https://help.sonatype.com/repomanager3/download/download-archives---repository-manager-3)

wget http://www.sonatype.org/downloads/nexus-latest-bundle.tar.gz

tar -xvzf nexus-latest-bundle.tar.gz

mv nexus-2.14.13-01 nexus

useradd nexus

sh –c ‘echo “export NEXUS_HOME=/usr/local/nexus” >> /etc/profile.d/nexus.sh’

cp /usr/local/nexus/bin/nexus /etc/init.d/nexus

chmod 755 /etc/init.d/nexus

chown root /etc/init.d/nexus

update-rc.d nexus defaults

create a directory for Sonatype products to use for working files

mkdir /etc/local/sonatype-work

create a directory for Nexus to use for working files

mkdir /etc/local/sonatype-work/nexus

make the nexus user created above the owner of this directory

chown –R nexus:nexus /etc/local/sonatype-work

edit this file to point to the directory and user created above.

vi /etc/init.d/nexus

NEXUS_HOME=”/usr/local/nexus”
RUN_AS_USER=”nexus”

/var/lib/dpkg/info/ca-certificates-java.postinst configure

su - nexus

$ service nexus start