Скачать или смотреть DevOps Traning -Session 3

MFH DevSecOps Training – Evening Batch

Topic: AWS EBS, Linux Disk Management, Partitions, Swap & Cron
Date: 22-01-2026
Duration: ~49 minutes

🟢 00:02 – 01:05 | AWS EBS Volume Types & IOPS

GP2 vs GP3 volume comparison

Understanding IOPS (Input/Output Operations)

GP3 as the latest AWS SSD option

IOPS scaling (3000 → up to ~80,000)

Selecting volume size (example: 50 GB)

Cloud flexibility and provisioning basics

🟢 01:05 – 02:45 | Creating & Attaching EBS Volume

Creating a 50 GB EBS volume

Volume state: available vs in-use

Attaching volume to EC2 instance (Bastion)

Understanding /dev directory

Device naming (e.g., /dev/sdk)

🟢 02:45 – 03:50 | Viewing Block Devices in Linux

Using lsblk to list block devices

Identifying root disk vs attached disks

Understanding disk size mapping

Verifying newly attached EBS volume

🟢 03:50 – 05:25 | Volumes vs Partitions (Concept)

Difference between volume and partition

Why partitions are required

Use cases (multiple databases on same disk)

Dividing a single volume into multiple partitions

Mounting partitions to different directories

🟢 05:25 – 07:30 | Partition Use Cases & Examples

Viewing partitions with lsblk and df -h

Example: dividing disk into smaller chunks

Real-world application data separation

🟢 07:30 – 09:05 | Introduction to parted Utility

What is parted

Disk partitioning utility explanation

⚠️ Warning about selecting correct block device

Risk of OS data loss if wrong device is used

🟢 09:05 – 11:30 | Disk Labels: GPT vs MBR

Creating disk labels

Difference between MBR and GPT

Partition limits in MBR

GPT as the modern and recommended approach

Using mklabel gpt

🟢 11:30 – 15:10 | Creating Partitions Step-by-Step

Using mkpart command

Naming partitions (P1, P2)

Choosing filesystem type

Best practice: start partition at 1MB

Creating multiple partitions

Verifying partitions with print and lsblk

🟢 15:10 – 16:15 | Persisting Partitions with partprobe

Kernel partition cache explanation

Why partitions disappear after reboot

Using partprobe to reload partition table

Making partitions permanent

🟢 16:15 – 18:10 | Filesystem Formatting (ext4)

Need for filesystem before usage

Overview of ext3 vs ext4

Performance and capacity considerations

Formatting partitions using mkfs.ext4

UUID and superblock creation

🟢 18:10 – 22:00 | Mounting Partitions

Creating mount directories

Mounting partitions to /mnt/part1, /mnt/part2

Writing data to mounted partitions

Understanding how data maps to disks

Verifying mount with df -h

🟢 22:00 – 25:00 | Best Practices for Data Storage

Why not to store data on root filesystem

Separating OS and application data

Database storage best practices


🟢 25:00 – 29:10 | Partition Expansion & LVM Concept

What happens when partition gets full

Extending volumes in cloud

Introduction to LVM (Logical Volume Manager)

Dynamic resizing using LVM

Real-world handling of disk growth

🟢 29:10 – 31:50 | Persistent Mounting (/etc/fstab)

Mount persistence after reboot

Role of /etc/fstab

Registering devices and mount points

Unmounting disks (umount)


🟢 31:50 – 33:10 | Disk Monitoring Commands

Using df -h

Understanding used, available, and mount points


🟢 33:10 – 36:40 | Swap Memory & Swappiness

What is swap memory

Swap vs RAM performance

When swap is useful

Checking swappiness value

🟢 36:40 – 38:10 | Cron Job Introduction

What is a cron job

Automating repetitive tasks

Real-world use cases (backups, cleanup)

🟢 38:10 – 42:50 | Cron Scheduling Syntax
crontab -e usage
Understanding 5-star (* * * * *) format
Minute, hour, day, month, week fields
Weekend and specific time scheduling

🟢 42:50 – 47:55 | Cron Job Practical Demo
Creating shell script
Making script executable
Redirecting output to log files

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