Script to install Jenkins - Based on official documents from January, 2024

jenkins-install.sh

#!/bin/bash

#https://www.jenkins.io/doc/book/installing/linux/

# Functions
command_exists() {
  command -v "$1" >/dev/null 2>&1
}

check_command_status() {
    if [ $? -eq 0 ]; then
        echo "$1 successful."
    else
        echo "Failed to $1. Check journalctl for logs."
        exit 1
    fi
}

# Requirements
packages=("wget" "fontconfig")

for package in "${packages[@]}"; do
  if ! command_exists "$package"; then
    echo "Installing $package..."
      sudo yum install -y "$package"
  else
      echo "$package is already installed. Skipping $package installation."
  fi
done

# Java is required
if ! command_exists java || [[ "$(java -version 2>&1 | grep 'java version')" == "" ]]; then
  echo "Java not found or invalid version. Installing Java..."
  sudo yum install -y java-17-openjdk
else
  echo "Java is already installed. Skipping Java installation."
fi

# Jenkins repo
if [ ! -f "/etc/yum.repos.d/jenkins.repo" ]; then
  echo "Adding Jenkins repository..."
  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-2023.key
else
  echo "Jenkins repository already configured. Skipping repository setup."
fi

# Update packages
echo "Upgrading system packages..."
sudo yum upgrade -y

# Jenkins install
if ! command_exists jenkins; then
  echo "Installing Jenkins..."
  sudo yum install -y jenkins
else
  echo "Jenkins is already installed. Skipping Jenkins installation."
fi

# Jenkins Daemon
echo "Reloading systemd..."
sudo systemctl daemon-reload
check_command_status "Reload systemd"

sudo systemctl enable --now jenkins.service
check_command_status "Enable and start Jenkins service"

echo "Installation completed successfully."