Jenkins

Install jenkins

On CentOS / RedHad based linux:

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cd ~ 
sudo yum remove java -y
sudo yum install java-1.11.0-openjdk-devel -y
sudo yum install -y git 
sudo wget -O /etc/yum.repos.d/jenkins.repo \
 http://pkg.jenkins.io/redhat-stable/jenkins.repo
sudo rpm --import http://pkg.jenkins.io/redhat-stable/jenkins.io.
key
sudo yum install -y jenkins

On Ubuntu:

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sudo apt install default-jre

sudo wget -O /usr/share/keyrings/jenkins-keyring.asc \
  https://pkg.jenkins.io/debian-stable/jenkins.io-2023.key
echo "deb [signed-by=/usr/share/keyrings/jenkins-keyring.asc]" \
  https://pkg.jenkins.io/debian-stable binary/ | sudo tee \
  /etc/apt/sources.list.d/jenkins.list > /dev/null
sudo apt-get update
sudo apt-get install jenkins

start jenkins service and set to start on boot

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sudo service jenkins start 
sudo chkconfig jenkins on

JenkinsFile

For jenkins pipeline you will need to add a jenkins file to your repo which will be used to configure the build when the changes are pushed to the repo.

Example of the jenkinsfile:

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pipeline {
    agent any
    stages {
        stage('Install dependencies') {
            steps {
                sh 'pip3 install -r requirements.txt'
            }
        }
        stage('Start application') {
            steps {
                sh 'python3 app.py'
            }
        }
    }
}

jenkins ssh keys

Jenkins will use the local jenkins user account to connect to remote repos so will need keys generated or added to the jenkins user:

create ssh key as jenkins user:

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sudo -u jenkins bash # open bash shell as jenkins user

ssh-keyken # generate ssh keys

cat ~/.ssh/id_rsa.pub # display newly created public key 

Jenkins cloud for docker

install docker plugin

Create cloud in jenkins

Enable remote management on docker host:

Edit the Docker service file (usually located at /lib/systemd/system/docker.service) to include the following:

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ExecStart=/usr/bin/dockerd -H fd:// -H tcp://0.0.0.0:2375

Install the Docker plugin in Jenkins.
Go to Manage Jenkins > Configure System > Cloud > Add a new cloud > Docker.
Configure the Docker cloud with the remote Docker host URL (e.g., tcp://:2375).

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