How to Install Nexus Repository on Ubuntu 20.04 LTS

In this article we are going to cover Install OpenJDK 1.8 on Ubuntu 20.04 LTS, Download Nexus Repository Manager setup on Ubuntu 20.04 LTS, How to Install Nexus Repository on Ubuntu 20.04 LTS.

Run Nexus as a service using Systemd, Access Nexus Repository Web Interface

What is Artifactory in DevOps ?

In CI/CD process when we build our project we obtain an artifactory after a build.So further in deployment phase we deploy these artifactories on our production / pre-production server.

So now if we assume what if we don’t use artifacts…It will be really very difficult over time.hat is why Artifacts are important to hold onto throughout the development process and also after that.

What is Nexus Repository Manager ?

Artifact Repository: Artifact repository is a location where you can store your all artifacts which are needed for the projects.

Nexus Repository Manager: It allows developer to collect, retrieve, manage our artifacts.

Basically Nexus Repository Manager helps us to host our repositories.

For eg- “Maven Central Repository” so we can use it to retrieve all dependencies needed for a Maven build.

Prerequisites

• Open JDK 8
• Minimum CPU’s: 4
• Ubuntu Server with User sudo privileges.
• Set User limits
• Web Browser
• Firewall/Inbound port: 22, 8081

you can go through Nexus artifactory official page to know more about system requirement for Nexus.

update the system packages

sudo apt-get update

#1: Install OpenJDK 1.8 on Ubuntu 20.04 LTS

sudo apt install openjdk-8-jre-headless

#2: Download Nexus Repository Manager setup on Ubuntu 20.04 LTS

Download the latest Nexus Repository Manager Setup from official nexus page.

Navigate to /opt directory

cd /opt

Download the SonaType Nexus on Ubuntu using wget

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

#3: Install Nexus Repository on Ubuntu 20.04 LTS

Extract the Nexus repository setup in /opt directory

tar -zxvf latest-unix.tar.gz

Rename the extracted Nexus setup folder to nexus

sudo mv /opt/nexus-3.30.1-01 /opt/nexus

As security practice, not to run nexus service using root user, so lets create new user named nexus to run nexus service

sudo adduser nexus

To set no password for nexus user open the visudo file in ubuntu

sudo visudo

Add below line into it , save and exit

nexus ALL=(ALL) NOPASSWD: ALL

Give permission to nexus files and nexus directory to nexus user

sudo chown -R nexus:nexus /opt/nexus

sudo chown -R nexus:nexus /opt/sonatype-work

To run nexus as service at boot time, open /opt/nexus/bin/nexus.rc file, uncomment it and add nexus user as shown below

sudo nano /opt/nexus/bin/nexus.rc

run_as_user="nexus"

To Increase the nexus JVM heap size, open the /opt/nexus/bin/nexus.vmoptions file, you can modify the size as shown below

In the below settings, the directory is changed from ../sonatype-work to ./sonatype-work

-Xms1024m
-Xmx1024m
-XX:MaxDirectMemorySize=1024m

-XX:LogFile=./sonatype-work/nexus3/log/jvm.log
-XX:-OmitStackTraceInFastThrow
-Djava.net.preferIPv4Stack=true
-Dkaraf.home=.
-Dkaraf.base=.
-Dkaraf.etc=etc/karaf
-Djava.util.logging.config.file=/etc/karaf/java.util.logging.properties
-Dkaraf.data=./sonatype-work/nexus3
-Dkaraf.log=./sonatype-work/nexus3/log
-Djava.io.tmpdir=./sonatype-work/nexus3/tmp

#4: Run Nexus as a service using Systemd

To run nexus as service using Systemd

sudo nano /etc/systemd/system/nexus.service

paste the below lines into it.

[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

[Install]
WantedBy=multi-user.target

To start nexus service using systemctl

sudo systemctl start nexus

To enable nexus service at system startup

sudo systemctl enable nexus

To check nexus service status

sudo systemctl status nexus

To stop Nexus service

sudo systemctl stop nexus

if the nexus service is not started, you can the nexus logs using below command

tail -f /opt/sonatype-work/nexus3/log/nexus.log

We have covered How to Install Nexus Repository on Ubuntu 20.04 LTS.

#5: Access Nexus Repository Web Interface

To access Nexus repository web interface , open your favorite browser

if you are running UFW firewall on Ubuntu, open the firewall port 8081 using below command

ufw allow 8081/tcp

http://server_IP:8081

you will see below default nexus page

To login to Nexus, click on Sign In, default username is admin

To find default password run the below command

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

copy the default nexus password and login, you can reset the password once logged in to nexus

Below nexus setup wizard will show

Change the default nexus admin password

configure Anonymous Access

click on Finish.

Conclusion:

In this article we have covered How to Install Nexus Repository on Ubuntu 20.04 LTS

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