🐧 Linux Shell Scripting for Beginners – Complete Tutorial Series.

• A 13-part practical shell scripting course for DevOps and Middleware Engineers.

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💡 How This Tutorial Series Will Help You

• ✔ Build a strong foundation in Linux Shell scripting — from basics to automation.
• ✔ Automate daily Middleware and DevOps tasks: monitoring, backups, and log management.
• ✔ Write scripts for Middleware platforms like Tomcat, Jenkins, and WebSphere.
• ✔ Debug, schedule, and manage production-ready shell scripts confidently.
• ✔ Perfect for Sysadmins, Middleware, and DevOps Engineers upgrading to Cloud roles.

📚 Complete Course Index

🐚 Part 1: What is a Variable?

Learn how variables store data and simplify automation scripts. Foundation of all shell logic.

📥 Part 2: Reading User Input in Shell

Make interactive scripts using read command with Jenkins and Tomcat examples.

🧩 Part 3: Conditional Statements (if, elif, else)

Use decision-making in your scripts with examples checking files, services, and network health.

🔁 Part 4: Loops in Shell (for, while, until)

Automate repetitive DevOps tasks like log cleanup, backups, and status monitoring.

⚙️ Part 5: Functions in Shell (Reusable Scripts)

Write modular, reusable functions — restart Tomcat or back up Jenkins in one click.

📦 Part 6: Arrays & Arguments

Store multiple values, manage user inputs, and process server lists in scripts.

📁 Part 7: File Handling in Shell

Learn how to read, write, append, and handle configuration or log files safely.

💡 Part 8: Debugging & Logging

Find and fix script errors, use logs, and enable debug mode for safe execution.

🕒 Part 9: Scheduling & Automation

Use cron and @reboot jobs to run scripts automatically for health checks or backups.

🎯 Part 10: Middleware Health Monitoring Project

Create a production-ready monitoring script for Tomcat, Jenkins, and NGINX with auto-restart.

🧾 Part 11: Log Management & Rotation

Automate log rotation with logrotate and custom retention scripts for Middleware systems.

💾 Part 12: Backup & Restore Automation Project

Perform automated backup and restore for Jenkins, Tomcat, and WebSphere with rollback support.

⚙️ Part 13: Subshells, Process Control & Parallel Execution

Run multiple jobs in parallel, monitor background processes, and speed up automation workflows.

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🚀 Why MiddlewareBox Shell Scripting Series?

• ✅ Step-by-step, beginner-friendly explanations.
• ✅ Each topic includes real DevOps & Middleware context.
• ✅ Examples with Output and Error handling.
• ✅ Simple language for better understanding.

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✨ Start Learning Now → Part 1: What is a Variable?
& build your own scripts from scratch! 💪

💾 Shell Scripting for Beginners – Part 12: Backup & Restore Automation Project (DevOps & Middleware Edition)

• Here we'll automate backup and restore tasks for real middleware & DevOps systems like Jenkins, Tomcat, WebSphere, MySQL, Docker, and Apache.
• Each example includes a working restore script and troubleshooting tips. ⚙️

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📑 Table of Contents

• 1️⃣ Jenkins Backup & Restore
• 2️⃣ Tomcat Backup & Restore
• 3️⃣ WebSphere Backup & Restore
• 4️⃣ MySQL Database Backup & Restore
• 5️⃣ Docker Containers Backup & Restore
• 6️⃣ Apache Webserver Backup & Restore
• 7️⃣ Automating Backups
• 🧠 Pro Tips & Troubleshooting
• 🏁 Summary

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1️⃣ Jenkins Backup & Restore

#!/bin/bash
JENKINS_HOME="/var/lib/jenkins"
BACKUP_DIR="/opt/backups/jenkins"
mkdir -p $BACKUP_DIR
tar -czf $BACKUP_DIR/jenkins_$(date +%F_%H-%M).tar.gz -C $JENKINS_HOME .
echo "✅ Jenkins backup created in $BACKUP_DIR"

♻️ Restore Jenkins

#!/bin/bash
BACKUP_FILE="/opt/backups/jenkins/jenkins_2025-11-02_02-10.tar.gz"
service jenkins stop
tar -xzf "$BACKUP_FILE" -C /var/lib/jenkins
chown -R jenkins:jenkins /var/lib/jenkins
service jenkins start
echo "♻️ Jenkins restored successfully."

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2️⃣ Tomcat Backup & Restore

#!/bin/bash
TOMCAT_HOME="/opt/tomcat"
BACKUP_DIR="/opt/backups/tomcat"
mkdir -p $BACKUP_DIR
tar -czf $BACKUP_DIR/tomcat_$(date +%F).tar.gz $TOMCAT_HOME/webapps $TOMCAT_HOME/conf
echo "📦 Tomcat backup completed."

♻️ Restore Tomcat

#!/bin/bash
BACKUP_FILE="/opt/backups/tomcat/tomcat_2025-11-02.tar.gz"
service tomcat stop
tar -xzf "$BACKUP_FILE" -C /
service tomcat start
echo "♻️ Tomcat restored and restarted."

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3️⃣ WebSphere Backup & Restore

#!/bin/bash
WAS_PROFILE="/opt/IBM/WebSphere/AppServer/profiles/AppSrv01"
BACKUP_DIR="/opt/backups/websphere"
mkdir -p $BACKUP_DIR
tar -czf $BACKUP_DIR/was_$(date +%F_%H-%M).tar.gz -C $WAS_PROFILE .
echo "📁 WebSphere configuration backup done."

♻️ Restore WebSphere

#!/bin/bash
BACKUP_FILE="/opt/backups/websphere/was_2025-11-02_03-00.tar.gz"
service was stop
tar -xzf "$BACKUP_FILE" -C /opt/IBM/WebSphere/AppServer/profiles/AppSrv01
service was start
echo "♻️ WebSphere restored successfully."

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4️⃣ MySQL Database Backup & Restore

#!/bin/bash
DB="middlewaredb"
USER="root"
PASS="Secret123"
BACKUP_DIR="/opt/backups/mysql"
mkdir -p $BACKUP_DIR
mysqldump -u $USER -p$PASS $DB > $BACKUP_DIR/${DB}_$(date +%F).sql
gzip $BACKUP_DIR/${DB}_$(date +%F).sql
echo "🗄️ MySQL backup completed."

♻️ Restore MySQL

#!/bin/bash
BACKUP_FILE="/opt/backups/mysql/middlewaredb_2025-11-02.sql.gz"
gunzip "$BACKUP_FILE"
mysql -u root -pSecret123 middlewaredb < /opt/backups/mysql/middlewaredb_2025-11-02.sql
echo "✅ Database restored successfully."

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5️⃣ Docker Containers Backup & Restore

#!/bin/bash
BACKUP_DIR="/opt/backups/docker"
mkdir -p $BACKUP_DIR
for cid in $(docker ps -q); do
  cname=$(docker inspect --format='{{.Name}}' $cid | cut -d'/' -f2)
  docker export $cid > $BACKUP_DIR/${cname}_$(date +%F).tar
done
echo "🐳 Docker containers exported successfully."

♻️ Restore Docker Container

#!/bin/bash
BACKUP_FILE="/opt/backups/docker/myapp_2025-11-02.tar"
docker import "$BACKUP_FILE" myapp_restored:latest
docker run -d --name myapp_restored myapp_restored:latest
echo "♻️ Docker container restored and running."

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6️⃣ Apache Webserver Backup & Restore

#!/bin/bash
BACKUP_DIR="/opt/backups/apache"
mkdir -p $BACKUP_DIR
tar -czf $BACKUP_DIR/apache_$(date +%F).tar.gz /etc/apache2 /var/www/html /etc/ssl
echo "🌐 Apache configuration, website, and SSL backed up."

♻️ Restore Apache

#!/bin/bash
BACKUP_FILE="/opt/backups/apache/apache_2025-11-02.tar.gz"
tar -xzf "$BACKUP_FILE" -C /
service apache2 restart
echo "✅ Apache restored and running."

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7️⃣ Automating Backups

Schedule automatic backups using cron so your systems stay protected 24×7.

# Run daily at 2 AM
0 2 * * * /opt/scripts/backup_all.sh >> /var/log/backup_all.log 2>&1

# Run on every reboot
@reboot /opt/scripts/backup_all.sh >> /var/log/backup_boot.log 2>&1

💬 Output:

[CRON] Scheduled backup started…
✅ Jenkins, Tomcat, WebSphere, MySQL, Docker, Apache backed up successfully.

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🧠 Pro Tips & Troubleshooting

✅ General Best Practices

• Use a dedicated /opt/backups partition or NFS mount to avoid filling system drives.
• Compress large backups with gzip or zstd [Developed by Meta] for better space efficiency.
• Store daily, weekly, and monthly copies separately (retention policy).
• Automate restores in a test environment weekly to ensure recovery works.

⚙️ Troubleshooting Common Issues

• ❌ Permission Denied: Run backups as sudo or fix ownership using chown.
• 📦 Disk Full: Use df -h to check space before backup. Add cleanup logic for old files.
• 🧾 Log Rotation: Add logrotate entry to keep backup logs small and readable.

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🏁 Summary

• ✅ Full backup & restore automation for all major middleware and DevOps tools.
• 🧩 Scripts are modular, reusable, and easy to integrate in CI/CD pipelines.
• ⚙️ Cron ensures zero manual intervention for daily protection.

← Previous: Part 11 – Log Management & Rotation Next: Part 13 – Subshells & Process Control →