Tuesday, January 11, 2022

Install SonaType Nexus 3 using Docker Compose | Install SonaType Nexus 3 using Docker on Ubuntu 18.0.4 | Install Nexus 3 using Docker-Compose

How to setup SonaType Nexus 3 using Docker compose?

Nexus is open source, binary repository manager and Java based tool. It can be installed quickly using Docker with less manual steps.

What is Docker Compose?
Compose is a tool for defining and running multi-container Docker applications. With Compose, you use a YAML file to configure your application’s services. Then, with a single command, you create and start all the services from your configuration. Since Docker Compose lets you configure related containers in a single YAML file, you get the same Infrastructure-as-Code abilities as Kubernetes. But they come in a simpler system that’s more suited to smaller applications that don’t need Kubernetes’ resiliency and scaling.
 
The purpose of docker-compose is to function as docker cli but to issue multiple commands much more quickly. To make use of docker-compose, you need to encode the commands you were running before into a docker-compose.yml file
 
Run docker-compose up and Compose starts and runs your entire app.

Watch the Steps in YouTube channel:

Pre-requistes:

  • Ubuntu EC2 up and running with at least t2.medium(4GB RAM), 2GB will not work
  • Port 8081, 8085 is opened in security firewall rule
  • instance should have docker and docker-compose installed

Perform System update
sudo apt-get update

Install Docker-Compose
sudo apt-get install docker-compose -y

Add current user to Docker group
sudo usermod -aG docker $USER

Create docker-compose.yml
this yml has all the configuration for installing Nexus on Ubuntu EC2.
sudo vi docker-compose.yml 

(Copy the below code high-lighted in yellow color)
version: "3"
services:
  nexus:
    image: sonatype/nexus3
    restart: always
    volumes:
      - "nexus-data:/sonatype-work"
    ports:
      - "8081:8081"
      - "8085:8085"

volumes:
  nexus-data: {}

Save the file by entering :wq!

Now execute the compose file using Docker compose command to start Nexus Container
sudo docker-compose up -d 


-d means detached mode

Make sure Nexus 3 is up and running
sudo docker-compose logs --follow


Once you see the message, that's it. Nexus 3 is been setup successfully. Now press Control C and enter to come out of the above screen.

How to get Nexus admin password?
Now access Nexus UI by going to browser and enter public dns name with port 8081
Now to go to browser --> http://change to_nexus_publicdns_name:8081

We need to login to Nexus docker container to get Nexus admin password.

Identify Docker container name
sudo docker ps


Get admin password by executing below command
sudo docker exec -it ubuntu_nexus_1 cat /nexus-data/admin.password


Please follow below steps for integrating Nexus 3 with Jenkins

How to stop nexus container
sudo docker-compose down



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