Install Jenkins on Debian


Before we start, let's ask ourselves the question: What is Jenkins?

Jenkins is an open source continuous integration server written in java that stands out for its ease of use. We could go into what this continuous integration and continuous delivery (CI/CD) stuff is all about, but we'll leave that to you to investigate.

Installing Jenkins takes no more than 10 minutes. The first thing we need is to have java 8 installed, as versions 10 and 11 are not supported by Jenkins.

sudo apt update

sudo apt install openjdk-8-jdk

We are going to install Jenkins from its repositories, therefore we will need to import the GPG key

wget -q -O - https://pkg.jenkins.io/debian/jenkins.io.key | sudo apt-key add -

Now we need to add the Jenkins repository to our apt, at this point it's a bit up to the consumer to put it in the main list by editing

vi /etc/apt/sources.list

y añadiendo el repositorio

deb http://pkg.jenkins.io/debian-stable binary/

or creating a list for Jenkins

sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

Whenever we add new repositories we have to update apt because otherwise it is as if we have done nothing.

sudo apt update

Once the update is complete, we can install

sudo apt install jenkins

And finally we start the service and configure it to start with the system

sudo systemctl start jenkins

sudo systemctl enable jenkins

With these simple steps we would already have Jenkins installed on our machine running on http on port 8080. Ummm http? better let's give it some security where we have 2 options Apache, Nginx,.... as a reverse proxy, either by doing the following or both why not?

sudo openssl pkcs12 -inkey dominio.net.key -in dominio.net.pem -export -out keys.pkcs12

sudo keytool -importkeystore -srckeystore keys.pkcs12 -srcstoretype pkcs12 -destkeystore /var/lib/jenkins/jenkins.jks

These commands will prompt you to enter a password, edit

vi /etc/sysconfig/jenkins

and in the configuration leave the following line as this one

JENKINS_ARGS="--httpPort=-1 --httpsPort=8443 --httpsKeyStore=/var/lib/jenkins/jenkins.jks --httpsKeyStorePassword=the password that you entered before"

We restart Jenkins

sudo systemctl restart jenkins

Ready, we have our Jenkins listening on https on port 8443, personally I would also add a reverse proxy apache.

This was just the installation, we will create a second post or expand this one with the first steps after the installation.


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