Nexus Server Installation in Linux - Mithun Technologies - +91-9980923226

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Login as a root user
sudo su -
cd /opt
yum install tar wget -y
wget http://download.sonatype.com/nexus/3/nexus-3.15.2-01-unix.tar.gz
tar -zxvf nexus-3.15.2-01-unix.tar.gz
mv /opt/nexus-3.15.2-01 /opt/nexus

#As a good security practice, Nexus is not advised to run nexus service as a root user, so create a new user called nexus and grant sudo access to manage nexus services as follows.
 
useradd nexus

#Give the sudo access to nexus user

visudo
nexus ALL=(ALL) NOPASSWD: ALL

#Change the owner and group permissions to /opt/nexus and /opt/sonatype-work directories.

chown -R nexus:nexus /opt/nexus
chown -R nexus:nexus /opt/sonatype-work
chmod -R 775 /opt/nexus
chmod -R 775 /opt/sonatype-work

#Open /opt/nexus/bin/nexus.rc file and  uncomment run_as_user parameter and set as nexus user.

vi /opt/nexus/bin/nexus.rc
run_as_user="nexus"

#Create nexus as a service

ln -s /opt/nexus/bin/nexus /etc/init.d/nexus

#Switch as a nexus user and start the nexus service as follows.

sudo su - nexus

#Enable the nexus services
sudo systemctl enable nexus

#Start the nexus service
sudo systemctl start nexus

#Access the Nexus server from Laptop/Desktop browser.

 

http://IPAddess/Hostname:8081/

#Default Credentials

User Name:

Password:

Troubleshooting
---------------------
nexus service is not starting?

a)make sure need to change the ownership and group to /opt/nexus and /opt/sonatype-work directories and permissions (775) for nexus user.
b)make sure you are trying to start nexus service with nexus user.
c)check java is installed or not using java -version command.
d) check the nexus.log file which is availabe in  /opt/sonatype-work/nexus3/log  directory.

Unable to access nexus URL?
-------------------------------------
a)make sure port 8081 is opened in security groups in AWS ec2 instance.

PUSH/PULL Docker Image form Private Repository (Nexus) - Mithun Technologies +91-9980923226

PUSH/PULL Docker Image form Private Repository (Nexus)

Pre-Requisities:

Server 1: Ubuntu                                         Server 2: Ubuntu

Install the below softwares in Server1          Install the below softwares in Server2

Java 8                                                              Docker

Docker

Jenkins

Maven/Gradle

Server 1:

1   We are going to build our project using maven/gradle

2   Through docker file we are going to create an docker image for that project

3   We are going to push the docker image to Nexus (docker hosted) repo

Server 2:

1  We are going to pull the docker image form Nexus (docker hosted) repo

2   Create a container using the docker image

Nexus Repository (docker hosted,proxy) Creation:

docker hosted:   

1) Login to your Nexus repository.

2) Create docker hosted

 

 Here give a name to the repo (dock-hosted), then we are going to assign a port to this docker hosted repo. Through this port we are going to access this repo. (Note: you should not give 8081 because it is already assigned to Nexus Repo, so use different port number)

In this case I have assigned 8083 for this repo.

3) Keep the remaining settings as it is and create repository

 Note: Open 8083 in AWS Security Groups.

Ubuntu Configuration : Server 1 & 2

Do these steps in both the servers in order to push and pull docker images from Nexus Repo.

1.     Login as root user

2.     Go to /etc/docker

            cd /etc/docker

3.     Then create a file called daemon.json

vi /etc/docker/daemon.json

4.     Write these script in daemon.json

{

  "insecure-registries": [ "13.234.21.143:8083" ]

}

(Here we are allowing our docker daemon to access the Nexus Hosted Repo)

5.     Save the file

6.     Restart docker service using below command.

            systemctl restart docker

 

Server 1: Login,Build & Push

1 Login to Nexus repo

docker login –u admin –p password 13.234.21.143:8083

(or)

docker login 13.234.21.143:8083

2  Build an image using below command.

docker build –t 13.234.21.143:8083/image1 .

           

(here while building an docker image we will use ip address with port for the docked hosted repo instead of username in hub.docker.com)

 

3 Push docker image to Nexus Repo

Server 2: Pull image/Run container

1.     Login to Nexus

2   Pull docker image

 

3  Build a container

docker run –d –p 8090:8080 –p 9990:9990 - -name wildfly 13.234.21.143:8083/image1

(I am using wildfly to deploy)