nexus installation

firest update repository :
debian : (# sudo apt-get update)
redhat : (# sudo yum update)

install java :

sudo apt install openjdk-8-jre-headless

sudo yum install java-1.8.0-openjdk-headless

Download latest version of nexus

cd /opt
sudo wget https://download.sonatype.com/nexus/3/latest-unix.tar.gz
sudo tar -zxvf latest-unix.tar.gz
rename folder :
sudo mv nexus-3.x.x.x/ /opt/nexus
add user with nexus name and set sudo access to it an NOPASSWD :
sudo adduser nexus
sudo vi /etc/sudoers
under root part : (User prilvilage spcification or Allow root to run any commands anywhere ) add this part :
nexus ALL=(ALL)NOPASSWD:ALL (save and exit )
give access to folders and file :
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 T uncomment it and nexus user as shown below :
sudo vi /opt/nexus/bin/nexus.rc
change as below :
run_as_user="nexus"

for increase the nexus JVM Heap Size :

sudo /opt/nexus/bin/nexus.vmoptions
-xms 2703 --> 1024

to run nexus as systemd service we should create unit file :

sudo 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

start and Enable service

sudo systemctl start nexus
sudo systemctl status nexus
sudo systemctl enable nexus

open port 8081 for web access

(ufw) sudo ufw allow 8081/tcp
(firewalld) sudo firewall-cmd --add-port=8081/tcp

web user and password

cat /opt/sonatype-work/nexus3/admin.password
(user will be admin and password will show in admin.password)