Install Nexus Repository on Ubuntu 20.04

Nexus Repository OSS is an open source repository that supports many artifact formats, including Docker, Java™, NuGet, Helm, Docker, P2, OBR, APT, GO, R, Conan components and more

Lets see how to install Nexus repository on Ubuntu Machine.

Pre-Requisites:

Update your Ubuntu OS

#apt update

#apt install net-tools wget openjdk -y

Below Link is for Nexus installer download archives

https://help.sonatype.com/repomanager3/download/download-archives—repository-manager-3

Download nexus installer using below command

wget https://download.sonatype.com/nexus/3/nexus-3.28.1-01-unix.tar.gz

Rename nexus-3.28.1-01 to nexus

#mv nexus-3.28.1-01 nexus

Move the nexus directory to /opt/directory

Move sonatype-work directory into opt directory

#mv sonatype-work /opt

Create a user called Nexus

#useradd nexus

Give permission to Nexus user
# chown -R nexus:nexus /opt/nexus
# chown -R nexus:nexus /opt/sonatype-work

Edit below nexus.rc file to add nexus user.

vi /opt/nexus/bin/nexus.rc

run_as_user=”nexus”

Then we need to Configure Nexus to run as systemd as service

vi /etc/systemd/system/nexus.service

[Unit]
Description=nexus service
After=network.target
  
[Service]
Type=forking
LimitNOFILE=65536
ExecStart=/opt/nexus/bin/nexus start
ExecStop=/opt/nexus/bin/nexus stop
User=nexus
Restart=on-abort
TimeoutSec=600
  
[Install]
WantedBy=multi-user.target

Activate the service with the following commands:

sudo systemctl daemon-reload 
sudo systemctl enable nexus.service 
sudo systemctl start nexus.service

Check nestat status for 8081 port.

root@server:/opt/nexus/bin# netstat -tnpl | grep 8081
tcp 0 0 127.0.0.1:8081 0.0.0.0:* LISTEN 7384/java

find password using below command.

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

username is admin by default.