guycalledavinash / nexus-repository

Remote repositories are inevitable

Predecessor: Maven

In production, remote repositories are used for sharing libraries, artifacts, etc.

One such tool is Nexus

If the snapshot and release repository details details are configured in pom.xml file, the commands ran in local are reflected in nexus repository, not local repo itself

This should be the local directory for maven: C:\user\.m2\repo\groupID

Server setup

I had hard time finding the right commands initially but these worked for me:

sudo apt install openjdk-8-jdk
java -version
sudo useradd -d /opt/nexus -s /bin/bash nexus
sudo passwd nexus
ulimit -n 65536
sudo nano /etc/security/limits.d/nexus.conf

paste this in the editor: nexus - nofile 65536

wget https://download.sonatype.com/nexus/3/nexus-3.41.1-01-unix.tar.gz
tar xzf nexus-3.41.1-01-unix.tar.gz
sudo mv nexus-3.41.1-01 /opt/nexus
sudo mv sonatype-work /opt/
chown -R nexus:nexus /opt/nexus /opt/sonatype-work
sudo nano /opt/nexus/bin/nexus.rc

run_as_user="nexus"

sudo nano /opt/nexus/bin/nexus.vmoptions

Change the existing RAM congiguration to this:

-Xms1024m

-Xmx1024m

-XX:MaxDirectMemorySize=1024m

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

insert snippet #1

sudo systemctl daemon-reload
sudo systemctl start nexus.service
sudo systemctl enable nexus.service
sudo systemctl status nexus.service
sudo apt install nginx -y
sudo systemctl is-enabled nginx
sudo systemctl status nginx
sudo nano /etc/nginx/sites-available/nexus

insert snippet #2

sudo ln -s /etc/nginx/sites-available/nexus /etc/nginx/sites-enabled/
sudo nginx -t
sudo systemctl restart nginx

Expose port 8081 in security settings and you're good

Integrate local Maven with Nexus

First job is to create two repositories in nexus i.e, snapshot and release

1. Go to Settings > repositories > create repo > maven2(hosted)

2. Give a name, select type and allow redeploy - create both repos

3. After creation, copy their links, paste them in this template in URL section.

<distributionManagement>  
		<repository>
			<id>nexus</id>
			<name>Avinash Release Nexus Repo</name>
			<url>http://18.191.242.105:8081/repository/avinash_release/</url>
		</repository>
	
		<snapshotRepository>
			<id>nexus</id>
			<name>Avinash Snapshot Nexus Repo</name>
			<url>http://18.191.242.105:8081/repository/avinash_snapshot/</url>
		</snapshotRepository>	
</distributionManagement>

4. Paste all this in 'pom.xml' file in the local - preview

(make sure to update the IP addresses in pom.xml as they keep changing everytime we login)

6. Also update 'settings.xml' from C:maven > conf > settings.xml like this

7. Once everything is setup, run this

mvn clean deploy

This deploys all the artifact in remote repository

#Remote Repository

Remote repos help companies maintain shared libraries with them.

It contributes to efficiency as companies can use the same artifact for multiple projects like a password encryption plugin