Install and use Jenkins on Centos 7

# About Jenkins

Jenkins is an open-source automation server that automates the repetitive technical tasks involved in the continuous integration and delivery of software. Jenkins is Java-based and can be installed from Ubuntu packages or by downloading and running its web application archive (WAR) file — a collection of files that make up a complete web application to run on a server.

# How to install Jenkins on Centos 7

To install Jenkins on Centos 7, follow my bash code (or you can save it to a jenkins.sh file, then run sh jenkins.sh)

echo "Begin bash code to install Jenkins on Centos 7 server - code by Tran Viet Huy"
echo "1. Jenkins is a Java application, so the first step is to install Java. Run the following command to install the OpenJDK 8 package:"
sudo yum install java-1.8.0-openjdk-devel -y

echo "2.The next step is to enable the Jenkins repository. To do that, import the GPG key using the following curl command:"

sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key

#curl --silent --location http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo | sudo tee /etc/yum.repos.d/jenkins.repo
#sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

echo "3.Once the repository is enabled, install the latest stable version of Jenkins by typing:"

sudo yum install jenkins -y

echo "4.After the installation process is completed, start the Jenkins service with:"

sudo systemctl start jenkins

echo "5. Check Service status again"
sudo systemctl status jenkins

echo "6. Check current Firewall port, Open port 8080, then reload and check again "
firewall-cmd --list-all
firewall-cmd --zone=public --add-port=8080/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all

echo "More info: 
About the error \"Public key for jenkins-2.249.2-1.1.noarch.rpm is not installed\"
Get the right public key here:
https://archives.jenkins-ci.org/redhat-stable/
"

As the bash code describe everything in detail, we can summarize them:

• Install open java
• Install jenkins
• Open port 8080
• Start jenkins service

# And the happiest moment: login to jenkins admin on port 8080

Open your web browser and fill in the address:

IP_address:8080

And now, we are at

You can view Jenkins initial Admin Password with this command line

nano /var/lib/jenkins/secrets/initialAdminPassword

or

vi /var/lib/jenkins/secrets/initialAdminPassword

Now, you have the admin password, fill in the password area and press Continue

Perfect, we are in

# Next step, install plugins and create first admin account

# Ref

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