Nexus Repository Manager : What is it & how to configure it on a Digital Ocean Droplet?
Single source of truth for all components, binaries, and build artifacts
8 min read
Table of contents
- What is a Repository Manager?
- Why Nexus Repository Manager? 🤔
- Configuring Nexus on Digital Ocean Droplet
- STEP 1 : Create a Droplet (cloud server)
- STEP 2 : Log in to the droplet using it's public IP address
- STEP 3 : Install Java version 8 and networking tools.
- STEP 4: Download Nexus Repository Manager and untar it.
- STEP 5: Create a new user nexus, give it appropriate permissions and change nexus configuration to run as a nexus user.
- STEP 6: Login as nexus and start nexus service
- Accessing Nexus from Browser 🤩
If you are working on a big project which would take long time, repository manager is the thing which can save you a lot of time and effort.
Let's say you are building a Java-Maven application. It uses Maven Central Repository for resolving dependencies. Now if you want to use a package not provided by Java by default, you need to get it from Maven Central. With repository managers, these packages are stored in the repository manager itself so you don't have to look for different packages at different places.
What is a Repository Manager?
A Repository manager is a dedicated server location which is used to manage all the repositories an development team will need throughout the development cycle.
We can consider Repository Manager as a Warehouse for parts. Just as a Warehouse serves as a centralized location for storage of parts and manages receiving, sending and everything in between, a Repository Manager manages all the parts involved in the software development process.
Repository v/s Repository Manager
A Repository is a storage location where components like artifacts, binaries or containers are retrieved so they can be installed or used whereas a Repository Manager is a dedicated application which manages all of your internal or proxy repositories.
Why do you need it? 🤔
Let's say you work in a company which is working upon multiple projects. Few of which are build using Java, .NET and Python. Each of these will produce different types of artifacts. Now you'll need different software to store each of them. A Repository manager solves this problem and provides a centralized platform to store all the components involved in the software development process. Few of the other features of a repository manager are :
👉 Saving time and bandwidth due to reduced number of downloads off remote repositories.
👉 Backup and Restore
👉 Cleanup Policies
👉 Search Functionality
👉 Multi-format support
Why Nexus Repository Manager? 🤔
Nexus Repository Manager is a FREE-to-use artifact repository manager by
Sonatype. It supports a wide variety of formats like APT, NuGET, Maven and Docker. List of all supported formats can be found here.
Now that you know what Nexus Repository Manager is, let me show you how to configure it on a cloud server. We'll configure Nexus on Digital Ocean Droplet(cloud server) for this blog but you can do the same on almost any other cloud service. Click here to get a FREE
$100 credit on Digital Ocean for 60 days.
Configuring Nexus on Digital Ocean Droplet
STEP 1 : Create a Droplet (cloud server)
Ubuntu 20.04 LTS but you are free to use distribution of your choice. You can choose the datacenter region which is nearest to your location. In my case it's
Bangalore. You can use
Password Authentication(less secure) or
SSH keys(more secure) for authentication.
Note : Make sure you choose
8 GB/ 4 vCPUs dropletbecause Nexus takes up a ton of memory and has high CPU usage at times.
STEP 2 : Log in to the droplet using it's
public IP address
If you used
SSH key Authentication, you won't be prompted for password but if you used
Password Authentication, you need to enter your password to authenticate yourself.
Note : The default user for any digital ocean droplet is
STEP 3 : Install
Java version 8 and networking tools.
Nexus repository manager requires
Java version 8to be installed to run.
netstatutility to check which port our application is listening to for which we need
net-toolspackage to be installed.
To install Java version 8 and net-tools use the command :
apt install openjdk-8-jre-headless -y apt install net-tools
To check if Java is properly installed, use the command :
The above command must give the output :
openjdk version "1.8.0_312" OpenJDK Runtime Environment (build 1.8.0_312-8u312-b07-0ubuntu1~20.04-b07) OpenJDK 64-Bit Server VM (build 25.312-b07, mixed mode)
STEP 4: Download
Nexus Repository Manager and
To download Nexus Repository manager in
/opt use command :
cd /opt wget https://download.sonatype.com/nexus/3/nexus-3.38.1-01-unix.tar.gz
To untar it, use the command :
tar -zxvf nexus-3.38.1-01-unix.tar.gz
After executing the above commands, when executing the command
ls(list files and directories) , it must have 2 new directories namely
root@ubuntu-s-4vcpu-8gb-intel-blr1-01:/opt# ls digitalocean nexus-3.38.1-01 nexus-3.38.1-01-unix.tar.gz sonatype-work
STEP 5: Create a new user
nexus, give it appropriate permissions and change nexus configuration to run as a
Note : Services should not run with Root user permissions.
Best Practice :
Create a new user for each service.
To create a new user
nexus, use the command :
It will ask for user information and password. To skip filling some values, press
root@ubuntu-s-4vcpu-8gb-intel-blr1-01:~# adduser nexus Adding user `nexus' ... Adding new group `nexus' (1000) ... Adding new user `nexus' (1000) with group `nexus' ... Creating home directory `/home/nexus' ... Copying files from `/etc/skel' ... New password: Retype new password: passwd: password updated successfully Changing the user information for nexus Enter the new value, or press ENTER for the default Full Name : Nexus Room Number : Work Phone : Home Phone : Other : Is the information correct? [Y/n] Y
Change the ownership of directories
nexus. To do so, use the command :
cd /opt chown -R nexus:nexus nexus-3.38.1-01/ chown -R nexus:nexus sonatype-work/
To check if the ownership was changed, use the command :
It must output :
drwxr-xr-x 4 root root 4096 Apr 3 05:51 digitalocean drwxr-xr-x 10 nexus nexus 4096 Apr 3 17:26 nexus-3.38.1-01 drwxr-xr-x 3 nexus nexus 4096 Apr 3 17:26 sonatype-work
To change nexus configuration to run as a nexus user, open the file
nexus.rc using :
Replace it's contents with :
STEP 6: Login as
nexus and start
To switch user from
nexus, use the command
su - <user_name>.
su - nexus
Now, to start nexus, use the command :
It must give the output :
nexus@ubuntu-s-4vcpu-8gb-intel-blr1-01:~$ /opt/nexus-3.38.1-01/bin/nexus start Starting nexus
To check if it started successfully or not, type :
ps aux | grep nexus
It must give the output :
nexus@ubuntu-s-4vcpu-8gb-intel-blr1-01:~$ ps aux | grep nexus root 20134 0.0 0.0 10132 3868 pts/0 S 19:08 0:00 su - nexus nexus 20137 0.0 0.0 10028 5092 pts/0 S 19:08 0:00 -bash nexus 20353 170 24.3 6618988 1986448 pts/0 Sl 19:10 3:13 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java -server -Dinstall4j.jvmDir=/usr/lib/jvm/java-8-openjdk-amd64/jre -Dexe4j.moduleName=/opt/nexus-3.38.1-01/bin/nexus -XX:+UnlockDiagnosticVMOptions -Dinstall4j.launcherId=245 -Dinstall4j.swt=false -Di4jv=0 -Di4jv=0 -Di4jv=0 -Di4jv=0 -Di4jv=0 -Xms2703m -Xmx2703m -XX:MaxDirectMemorySize=2703m -XX:+UnlockDiagnosticVMOptions -XX:+LogVMOutput -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 -Dkaraf.startLocalConsole=false -Djdk.tls.ephemeralDHKeySize=2048 -Djava.endorsed.dirs=lib/endorsed -Di4j.vpt=true -classpath /opt/nexus-3.38.1-01/.install4j/i4jruntime.jar:/opt/nexus-3.38.1-01/lib/boot/nexus-main.jar:/opt/nexus-3.38.1-01/lib/boot/activation-1.1.1.jar:/opt/nexus-3.38.1-01/lib/boot/jakarta.xml.bind-api-2.3.3.jar:/opt/nexus-3.38.1-01/lib/boot/jaxb-runtime-2.3.3.jar:/opt/nexus-3.38.1-01/lib/boot/txw2-2.3.3.jar:/opt/nexus-3.38.1-01/lib/boot/istack-commons-runtime-3.0.10.jar:/opt/nexus-3.38.1-01/lib/boot/org.apache.karaf.main-4.3.6.jar:/opt/nexus-3.38.1-01/lib/boot/osgi.core-7.0.0.jar:/opt/nexus-3.38.1-01/lib/boot/org.apache.karaf.specs.activator-4.3.6.jar:/opt/nexus-3.38.1-01/lib/boot/org.apache.karaf.diagnostic.boot-4.3.6.jar:/opt/nexus-3.38.1-01/lib/boot/org.apache.karaf.jaas.boot-4.3.6.jar com.install4j.runtime.launcher.UnixLauncher start 9d17dc87 0 0 org.sonatype.nexus.karaf.NexusMain nexus 20778 0.0 0.0 10616 3300 pts/0 R+ 19:12 0:00 ps aux nexus 20779 0.0 0.0 8160 732 pts/0 S+ 19:12 0:00 grep --color=auto nexus
In my case the process with process ID
20353. By default it is accessible on the port
8081. We can check it using the command :
It would give the output :
nexus@ubuntu-s-4vcpu-8gb-intel-blr1-01:~$ netstat -lpnt (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:8081 0.0.0.0:* LISTEN 20353/java tcp 0 0 127.0.0.1:44945 0.0.0.0:* LISTEN 20353/java tcp 0 0 127.0.0.53:53 0.0.0.0:* LISTEN - tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN - tcp6 0 0 :::22 :::* LISTEN -
We can confirm from the above output that
20353/java(nexus service) is accessible at port
If it doesn't show up in your case, give it some time(atleast 5 min) before restarting the service.
Accessing Nexus from Browser 🤩
We can access Nexus from Browser but for that we need to configure the firewall of our droplet to allow incoming requests to port
To do so,
👉 Click on the droplet
👉 Scroll down to the bottom and click on
Edit button under
👉 Click on
👉 Name the
inbound rules(rules for incoming requests), create a new
Custom rule. Let the protocol be
TCP and change the port to
All IPv4 and
All IPv6 from sources and put your
Public IP address in that field because you don't want your nexus service to be accessible to anyone.
You can get your
Public IP addressfrom the URL :
Now to access it from your browser, open up your browser and in the address bar type:
for example it's
220.127.116.11:8081 in my case where
18.104.22.168 is my Droplet's IPv4 and
8081 is the port number.
Congratulations🥳! You're all set to use Nexus in your Browser🤩.
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